C++打开文件夹对话框-通用文件对话框

Dear 丶 2023-09-26 19:14 78阅读 0赞

此文介绍如何打开本地文本文件、文件夹对话框

## 方法一： ##

### 效果图： ###

![4d84262dfa0046b4ac1be196e780a113.png][]

![351d3b20f208459e9f3694497e776e3d.png][]

![532ae613fc9c4cc3b1dd6324ae31066b.png][]

#### 源码 ####

#include <iostream>
    #include <objbase.h>
    #include <ShObjIdl.h>
    using namespace std;
    int main()
    {
        cout << "start=====" << endl;
        HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED |
            COINIT_DISABLE_OLE1DDE);
        if (SUCCEEDED(hr))
        {
            IFileOpenDialog* pFileOpen;
    
            // Create the FileOpenDialog object.
            hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_ALL,
                IID_IFileOpenDialog, reinterpret_cast<void**>(&pFileOpen));
    
            if (SUCCEEDED(hr))
            {
                // Show the Open dialog box.
                hr = pFileOpen->Show(NULL);
    
                // Get the file name from the dialog box.
                if (SUCCEEDED(hr))
                {
                    IShellItem* pItem;
                    hr = pFileOpen->GetResult(&pItem);
                    if (SUCCEEDED(hr))
                    {
                        PWSTR pszFilePath;
                        hr = pItem->GetDisplayName(SIGDN_FILESYSPATH, &pszFilePath);
    
                        // Display the file name to the user.
                        if (SUCCEEDED(hr))
                        {
                            MessageBoxW(NULL, pszFilePath, L"File Path", MB_OK);
                            CoTaskMemFree(pszFilePath);
                        }
                        pItem->Release();
                    }
                }
                pFileOpen->Release();
            }
            CoUninitialize();
        }
        return 0;
    }

#### 出现错误 ####

1、2、IID\_IFileOpenDialog' was not declared in this scope

将

hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_ALL,
                IID_IFileOpenDialog, reinterpret_cast<void**>(&pFileOpen));

改为

hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pFileOpen));

2、 error: invalid use of incomplete type 'IFileDialog \{aka struct IFileDialog\}'

原因：默认情况下，MinGW将NTDDI\_VERSION宏的值设置为0x05020000 (NTDDI\_WS03)，这会禁用shobjidl.h中的IFileDialog定义。宏的值必须至少为0x06000000 (NTDDI\_VISTA)才能启用定义。下面列出了这些宏的可能值及其含义:

将以下内容放在源文件的开头(在include之前)应该可以修复编译错误:

#define NTDDI_VERSION 0x0A000006 //NTDDI_WIN10_RS5
    #define _WIN32_WINNT 0x0A00 // _WIN32_WINNT_WIN10, the _WIN32_WINNT macro must also be defined when defining NTDDI_VERSION

如果您没有链接所需的库，则可能仍然存在链接错误。你列出的程序需要ole32.dll和uuid.dll，所以编译命令看起来像这样:

![a646639f7d994aa789bae824d728f629.png][]

## 方法二： ##

### 效果图： ###

选择要尝试的文件对话框类型

![4c1926eba4bd4800847f83c909a357db.png][]

打开对话框效果

![818aa3dc5e7c4554b48224e9bec28756.png][]

![38373aa5e24f413e8f34f41d8441b473.png][]

![53558690224e4c25b5f56ee061ac8c38.png][]

![e08596bc466b4cc0b15cd6fe0a773bdb.png][]

### 源码 ###

#### ShellHelpers.h ####

#pragma once
    #pragma once
    
    #define STRICT_TYPED_ITEMIDS    // in case you do IDList stuff you want this on for better type saftey
    #define UNICODE 1
    
    #include <windows.h>
    #include <windowsx.h>           // for WM_COMMAND handling macros
    #include <shlobj.h>             // shell stuff
    #include <shlwapi.h>            // QISearch, easy way to implement QI
    #include <propkey.h>
    #include <propvarutil.h>
    #include <strsafe.h>
    #include <objbase.h>
    
    #pragma comment(lib, "shlwapi.lib")     // link to this
    #pragma comment(lib, "comctl32.lib")    // link to this
    #pragma comment(lib, "propsys.lib")     // link to this
    
    // set up common controls v6 the easy way
    #pragma comment(linker,"/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
    
    __inline HRESULT ResultFromKnownLastError() { const DWORD err = GetLastError(); return err == ERROR_SUCCESS ? E_FAIL : HRESULT_FROM_WIN32(err); }
    
    // map Win32 APIs that follow the return BOOL/set last error protocol
    // into HRESULT
    //
    // example: MoveFileEx()
    
    __inline HRESULT ResultFromWin32Bool(BOOL b)
    {
        return b ? S_OK : ResultFromKnownLastError();
    }
    
    #if (NTDDI_VERSION >= NTDDI_VISTA)
    
    __inline HRESULT ShellExecuteItem(HWND hwnd, PCWSTR pszVerb, IShellItem* psi)
    {
        // how to activate a shell item, use ShellExecute().
        PIDLIST_ABSOLUTE pidl;
        HRESULT hr = SHGetIDListFromObject(psi, &pidl);
        if (SUCCEEDED(hr))
        {
            SHELLEXECUTEINFO ei = { sizeof(ei) };
            ei.fMask = SEE_MASK_INVOKEIDLIST;
            ei.hwnd = hwnd;
            ei.nShow = SW_NORMAL;
            ei.lpIDList = pidl;
            ei.lpVerb = pszVerb;
    
            hr = ResultFromWin32Bool(ShellExecuteEx(&ei));
    
            CoTaskMemFree(pidl);
        }
        return hr;
    }
    
    __inline HRESULT GetItemFromView(IFolderView2* pfv, int iItem, REFIID riid, void** ppv)
    {
        *ppv = NULL;
    
        HRESULT hr = S_OK;
    
        if (iItem == -1)
        {
            hr = pfv->GetSelectedItem(-1, &iItem); // Returns S_FALSE if none selected
        }
    
        if (S_OK == hr)
        {
            hr = pfv->GetItem(iItem, riid, ppv);
        }
        else
        {
            hr = E_FAIL;
        }
        return hr;
    }
    
    // set the icon for your window using WM_SETICON from one of the set of stock system icons
    // caller must call ClearDialogIcon() to free the HICON that is created
    __inline void SetDialogIcon(HWND hdlg, SHSTOCKICONID siid)
    {
        SHSTOCKICONINFO sii = { sizeof(sii) };
        if (SUCCEEDED(SHGetStockIconInfo(siid, SHGFI_ICON | SHGFI_SMALLICON, &sii)))
        {
            SendMessage(hdlg, WM_SETICON, ICON_SMALL, (LPARAM)sii.hIcon);
        }
        if (SUCCEEDED(SHGetStockIconInfo(siid, SHGFI_ICON | SHGFI_LARGEICON, &sii)))
        {
            SendMessage(hdlg, WM_SETICON, ICON_BIG, (LPARAM)sii.hIcon);
        }
    }
    #endif
    
    // free the HICON that was set using SetDialogIcon()
    __inline void ClearDialogIcon(HWND hdlg)
    {
        DestroyIcon((HICON)SendMessage(hdlg, WM_GETICON, ICON_SMALL, 0));
        DestroyIcon((HICON)SendMessage(hdlg, WM_GETICON, ICON_BIG, 0));
    }
    
    __inline HRESULT SetItemImageImageInStaticControl(HWND hwndStatic, IShellItem* psi)
    {
        HBITMAP hbmp = NULL;
        HRESULT hr = S_OK;
        if (psi)
        {
            IShellItemImageFactory* psiif;
            hr = psi->QueryInterface(IID_PPV_ARGS(&psiif));
            if (SUCCEEDED(hr))
            {
                RECT rc;
                GetWindowRect(hwndStatic, &rc);
                const UINT dxdy = min(rc.right - rc.left, rc.bottom - rc.top);    // make it square
                const SIZE size = { dxdy, dxdy };
    
                hr = psiif->GetImage(size, SIIGBF_RESIZETOFIT, &hbmp);
                psiif->Release();
            }
        }
    
        if (SUCCEEDED(hr))
        {
            HGDIOBJ hgdiOld = (HGDIOBJ)SendMessage(hwndStatic, STM_SETIMAGE, (WPARAM)IMAGE_BITMAP, (LPARAM)hbmp);
            if (hgdiOld)
            {
                DeleteObject(hgdiOld);  // if there was an old one clean it up
            }
        }
    
        return hr;
    }
    
    
    __inline HRESULT SHILCloneFull(PCUIDLIST_ABSOLUTE pidl, PIDLIST_ABSOLUTE* ppidl)
    {
        *ppidl = ILCloneFull(pidl);
        return *ppidl ? S_OK : E_OUTOFMEMORY;
    }
    
    __inline HRESULT SHILClone(PCUIDLIST_RELATIVE pidl, PIDLIST_RELATIVE* ppidl)
    {
        *ppidl = ILClone(pidl);
        return *ppidl ? S_OK : E_OUTOFMEMORY;
    }
    
    __inline HRESULT SHILCombine(PCIDLIST_ABSOLUTE pidl1, PCUIDLIST_RELATIVE pidl2, PIDLIST_ABSOLUTE* ppidl)
    {
        *ppidl = ILCombine(pidl1, pidl2);
        return *ppidl ? S_OK : E_OUTOFMEMORY;
    }
    
    __inline HRESULT GetItemAt(IShellItemArray* psia, DWORD i, REFIID riid, void** ppv)
    {
        *ppv = NULL;
        IShellItem* psi = NULL;     // avoid error C4701
        HRESULT hr = psia ? psia->GetItemAt(i, &psi) : E_NOINTERFACE;
        if (SUCCEEDED(hr))
        {
            hr = psi->QueryInterface(riid, ppv);
            psi->Release();
        }
        return hr;
    }
    
    #define MAP_ENTRY(x) {L#x, x}
    
    __inline HRESULT ShellAttributesToString(SFGAOF sfgaof, PWSTR* ppsz)
    {
        *ppsz = NULL;
    
        static const struct { PCWSTR pszName; SFGAOF sfgaof; } c_rgItemAttributes[] =
        {
            // note, SFGAO_HASSUBFOLDER is too expesnive to compute
            // and has been excluded from this list
            MAP_ENTRY(SFGAO_STREAM),
            MAP_ENTRY(SFGAO_FOLDER),
            MAP_ENTRY(SFGAO_FILESYSTEM),
            MAP_ENTRY(SFGAO_FILESYSANCESTOR),
            MAP_ENTRY(SFGAO_STORAGE),
            MAP_ENTRY(SFGAO_STORAGEANCESTOR),
            MAP_ENTRY(SFGAO_LINK),
            MAP_ENTRY(SFGAO_CANCOPY),
            MAP_ENTRY(SFGAO_CANMOVE),
            MAP_ENTRY(SFGAO_CANLINK),
            MAP_ENTRY(SFGAO_CANRENAME),
            MAP_ENTRY(SFGAO_CANDELETE),
            MAP_ENTRY(SFGAO_HASPROPSHEET),
            MAP_ENTRY(SFGAO_DROPTARGET),
            MAP_ENTRY(SFGAO_ENCRYPTED),
            MAP_ENTRY(SFGAO_ISSLOW),
            MAP_ENTRY(SFGAO_GHOSTED),
            MAP_ENTRY(SFGAO_SHARE),
            MAP_ENTRY(SFGAO_READONLY),
            MAP_ENTRY(SFGAO_HIDDEN),
            MAP_ENTRY(SFGAO_REMOVABLE),
            MAP_ENTRY(SFGAO_COMPRESSED),
            MAP_ENTRY(SFGAO_BROWSABLE),
            MAP_ENTRY(SFGAO_NONENUMERATED),
            MAP_ENTRY(SFGAO_NEWCONTENT),
        };
    
        WCHAR sz[512] = {};
        PWSTR psz = sz;
        size_t cch = ARRAYSIZE(sz);
    
        StringCchPrintfEx(psz, cch, &psz, &cch, 0, L"0x%08X", sfgaof);
    
        for (int i = 0; i < ARRAYSIZE(c_rgItemAttributes); i++)
        {
            if (c_rgItemAttributes[i].sfgaof & sfgaof)
            {
                StringCchPrintfEx(psz, cch, &psz, &cch, 0, L", %s", c_rgItemAttributes[i].pszName);
            }
        }
        return SHStrDup(sz, ppsz);
    }
    
    template <class T> void SafeRelease(T** ppT)
    {
        if (*ppT)
        {
            (*ppT)->Release();
            *ppT = NULL;
        }
    }
    
    // assign an interface pointer, release old, capture ref to new, can be used to set to zero too
    
    template <class T> HRESULT SetInterface(T** ppT, IUnknown* punk)
    {
        SafeRelease(ppT);
        return punk ? punk->QueryInterface(ppT) : E_NOINTERFACE;
    }
    
    // remote COM methods are dispatched in the context of an exception handler that consumes
    // all SEH exceptions including crahses and C++ exceptions. this is undesirable as it
    // means programs will continue to run after such an exception has been thrown,
    // leaving the process in a inconsistent state.
    //
    // this applies to COM methods like IDropTarget::Drop()
    //
    // this code turns off that behavior
    
    __inline void DisableComExceptionHandling()
    {
        IGlobalOptions* pGlobalOptions;
        HRESULT hr = CoCreateInstance(CLSID_GlobalOptions, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pGlobalOptions));
        if (SUCCEEDED(hr))
        {
    #if (NTDDI_VERSION >= NTDDI_WIN7)
            hr = pGlobalOptions->Set(COMGLB_EXCEPTION_HANDLING, COMGLB_EXCEPTION_DONOT_HANDLE_ANY);
    #else
            hr = pGlobalOptions->Set(COMGLB_EXCEPTION_HANDLING, COMGLB_EXCEPTION_DONOT_HANDLE);
    #endif
            pGlobalOptions->Release();
        }
    }
    
    __inline void GetWindowRectInClient(HWND hwnd, RECT* prc)
    {
        GetWindowRect(hwnd, prc);
        MapWindowPoints(GetDesktopWindow(), GetParent(hwnd), (POINT*)prc, 2);
    }
    
    // retrieve the HINSTANCE for the current DLL or EXE using this symbol that
    // the linker provides for every module, avoids the need for a global HINSTANCE variable
    // and provides access to this value for static libraries
    EXTERN_C IMAGE_DOS_HEADER __ImageBase;
    __inline HINSTANCE GetModuleHINSTANCE() { return (HINSTANCE)&__ImageBase; }

#### FileName2.cpp ####

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
    // ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
    // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
    // PARTICULAR PURPOSE.
    //
    // Copyright (c) Microsoft Corporation. All rights reserved
    
    #include <windows.h>
    #define STRICT_TYPED_ITEMIDS
    #include <shlobj.h>
    #include <shlwapi.h>
    #include "ShellHelpers.h"
    #include <strsafe.h>
    #include <new>
    
    const DWORD c_idAdd = 601;
    const DWORD c_idDone = 602;
    
    #define IDC_PICKITEM              100
    #define IDC_PICKCONTAINER         101
    #define IDC_FILEOPENBASKETPICKER  102
    #define IDC_PICKFILESANDFOLDERS   103
    
    /* Utility Classes and Functions *************************************************************************************************/
    
    /*
        Usage:
        CItemIterator itemIterator(psi);
        while (itemIterator.MoveNext())
        {
            IShellItem2 *psi;
            hr = itemIterator.GetCurrent(IID_PPV_ARGS(&psi));
            if (SUCCEEDED(hr))
            {
                // Perform action on psi
                psi->Release();
            }
        }
    */
    class CItemIterator
    {
    public:
        CItemIterator(IShellItem* psi) : _hr(SHGetIDListFromObject(psi, &_pidlFull)), _psfCur(NULL)
        {
            _Init();
        }
    
        CItemIterator(PCIDLIST_ABSOLUTE pidl) : _hr(SHILCloneFull(pidl, &_pidlFull)), _psfCur(NULL)
        {
            _Init();
        }
    
        ~CItemIterator()
        {
            CoTaskMemFree(_pidlFull);
            SafeRelease(&_psfCur);
        }
    
        bool MoveNext()
        {
            bool fMoreItems = false;
            if (SUCCEEDED(_hr))
            {
                if (NULL == _pidlRel)
                {
                    fMoreItems = true;
                    _pidlRel = _pidlFull;   // First item - Might be empty if it is the desktop
                }
                else if (!ILIsEmpty(_pidlRel))
                {
                    PCUITEMID_CHILD pidlChild = (PCUITEMID_CHILD)_pidlRel;  // Save the current segment for binding
                    _pidlRel = ILNext(_pidlRel);
    
                    // If we are not at the end setup for the next iteration
                    if (!ILIsEmpty(_pidlRel))
                    {
                        const WORD cbSave = _pidlRel->mkid.cb;  // Avoid cloning for the child by truncating temporarily
                        _pidlRel->mkid.cb = 0;                  // Make this a child
    
                        IShellFolder* psfNew;
                        _hr = _psfCur->BindToObject(pidlChild, NULL, IID_PPV_ARGS(&psfNew));
                        if (SUCCEEDED(_hr))
                        {
                            _psfCur->Release();
                            _psfCur = psfNew;   // Transfer ownership
                            fMoreItems = true;
                        }
    
                        _pidlRel->mkid.cb = cbSave; // Restore previous ID size
                    }
                }
            }
            return fMoreItems;
        }
    
        HRESULT GetCurrent(REFIID riid, void** ppv)
        {
            *ppv = NULL;
            if (SUCCEEDED(_hr))
            {
                // Create the childID by truncating _pidlRel temporarily
                PUIDLIST_RELATIVE pidlNext = ILNext(_pidlRel);
                const WORD cbSave = pidlNext->mkid.cb;  // Save old cb
                pidlNext->mkid.cb = 0;                  // Make _pidlRel a child
    
                _hr = SHCreateItemWithParent(NULL, _psfCur, (PCUITEMID_CHILD)_pidlRel, riid, ppv);
    
                pidlNext->mkid.cb = cbSave;             // Restore old cb
            }
            return _hr;
        }
    
        HRESULT GetResult() const { return _hr; }
        PCUIDLIST_RELATIVE GetRelativeIDList() const { return _pidlRel; }
    
    private:
        void _Init()
        {
            _pidlRel = NULL;
    
            if (SUCCEEDED(_hr))
            {
                _hr = SHGetDesktopFolder(&_psfCur);
            }
        }
    
        HRESULT _hr;
        PIDLIST_ABSOLUTE _pidlFull;
        PUIDLIST_RELATIVE _pidlRel;
        IShellFolder* _psfCur;
    };
    
    HRESULT GetIDListName(IShellItem* psi, PWSTR* ppsz)
    {
        *ppsz = NULL;
        HRESULT hr = E_FAIL;
    
        WCHAR szFullName[2048];
        szFullName[0] = 0;
        PWSTR pszOutput = szFullName;
        size_t cchOutput = ARRAYSIZE(szFullName);
    
        CItemIterator itemIterator(psi);
        while (itemIterator.MoveNext())
        {
            IShellItem2* psi;
            hr = itemIterator.GetCurrent(IID_PPV_ARGS(&psi));
            if (SUCCEEDED(hr))
            {
                PWSTR pszName;
                hr = psi->GetDisplayName(SIGDN_PARENTRELATIVE, &pszName);
                if (SUCCEEDED(hr))
                {
                    // Ignore errors, this is for debugging only
                    StringCchCatEx(pszOutput, cchOutput, L"[", &pszOutput, &cchOutput, 0);
                    StringCchCatEx(pszOutput, cchOutput, pszName, &pszOutput, &cchOutput, 0);
                    StringCchCatEx(pszOutput, cchOutput, L"]", &pszOutput, &cchOutput, 0);
                    CoTaskMemFree(pszName);
                }
                psi->Release();
            }
        }
    
        if (SUCCEEDED(hr))
        {
            hr = SHStrDup(szFullName, ppsz);
        }
        return hr;
    }
    
    HRESULT GetSelectionFromSite(IUnknown* punkSite, BOOL fNoneImpliesFolder, IShellItemArray** ppsia)
    {
        *ppsia = NULL;
        IFolderView2* pfv;
        HRESULT hr = IUnknown_QueryService(punkSite, SID_SFolderView, IID_PPV_ARGS(&pfv));
        if (SUCCEEDED(hr))
        {
            hr = pfv->GetSelection(fNoneImpliesFolder, ppsia);
            pfv->Release();
        }
        return hr;
    }
    
    void DeletePerUserDialogState()
    {
        IFileDialog* pfd;
        HRESULT hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pfd));
        if (SUCCEEDED(hr))
        {
            // Delete window size, MRU and other saved data for testing initial case
            pfd->ClearClientData();
            pfd->Release();
        }
    }
    
    void ReportSelectedItems(IUnknown* punkSite, IShellItemArray* psia)
    {
        DWORD cItems;
        HRESULT hr = psia->GetCount(&cItems);
        for (DWORD i = 0; SUCCEEDED(hr) && (i < cItems); i++)
        {
            IShellItem* psi;
            hr = psia->GetItemAt(i, &psi);
            if (SUCCEEDED(hr))
            {
                PWSTR pszName;
                hr = GetIDListName(psi, &pszName);
                if (SUCCEEDED(hr))
                {
                    HWND hwnd;
                    IUnknown_GetWindow(punkSite, &hwnd);
                    int nButton;
                    const TASKDIALOG_COMMON_BUTTON_FLAGS buttonFlags = (i == (cItems - 1)) ? TDCBF_OK_BUTTON : TDCBF_OK_BUTTON | TDCBF_CANCEL_BUTTON;
                    WCHAR szMsg[128];
                    StringCchPrintf(szMsg, ARRAYSIZE(szMsg), L"Item %d of %d added to basket", i + 1, cItems);
                    if (SUCCEEDED(TaskDialog(hwnd, 0, L"Items Addded to Basket", szMsg, pszName, buttonFlags, NULL, &nButton)))
                    {
                        hr = (nButton == IDCANCEL) ? HRESULT_FROM_WIN32(ERROR_CANCELLED) : S_OK;
                    }
                    CoTaskMemFree(pszName);
                }
                psi->Release();
            }
        }
    }
    
    void ReportSelectedItemsFromSite(IUnknown* punkSite)
    {
        IShellItemArray* psia;
        HRESULT hr = GetSelectionFromSite(punkSite, TRUE, &psia);
        if (SUCCEEDED(hr))
        {
            ReportSelectedItems(punkSite, psia);
            psia->Release();
        }
    }
    
    /* Picking a file ****************************************************************************************************************/
    
    void PickItem()
    {
        IFileDialog* pfd;
        if (SUCCEEDED(CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pfd))))
        {
            if (SUCCEEDED(pfd->Show(NULL)))
            {
                IShellItem* psi;
                if (SUCCEEDED(pfd->GetResult(&psi)))
                {
                    PWSTR pszPath;
                    if (SUCCEEDED(GetIDListName(psi, &pszPath)))
                    {
                        MessageBox(NULL, pszPath, L"Selected Item", MB_OK);
                        CoTaskMemFree(pszPath);
                    }
                    psi->Release();
                }
            }
            pfd->Release();
        }
    }
    
    /* Picking a container ***********************************************************************************************************/
    
    void PickContainer()
    {
        IFileDialog* pfd;
        if (SUCCEEDED(CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pfd))))
        {
            DWORD dwOptions;
            if (SUCCEEDED(pfd->GetOptions(&dwOptions)))
            {
                pfd->SetOptions(dwOptions | FOS_PICKFOLDERS);
            }
    
            if (SUCCEEDED(pfd->Show(NULL)))
            {
                IShellItem* psi;
                if (SUCCEEDED(pfd->GetResult(&psi)))
                {
                    PWSTR pszPath;
                    if (SUCCEEDED(GetIDListName(psi, &pszPath)))
                    {
                        MessageBox(NULL, pszPath, L"Selected Container", MB_OK);
                        CoTaskMemFree(pszPath);
                    }
                    psi->Release();
                }
            }
            pfd->Release();
        }
    }
    
    /* Picking Files in Basket Mode **************************************************************************************************/
    
    class CFileOpenBasketPickerCallback : public IFileDialogEvents, public IFileDialogControlEvents
    {
    public:
        CFileOpenBasketPickerCallback()
        {
        }
    
        // IUnknown
        IFACEMETHODIMP QueryInterface(REFIID riid, void** ppv)
        {
            static const QITAB qit[] = {
                QITABENT(CFileOpenBasketPickerCallback, IFileDialogEvents),
                QITABENT(CFileOpenBasketPickerCallback, IFileDialogControlEvents),
                { 0 },
            };
            return QISearch(this, qit, riid, ppv);
        }
    
        // This class makes special assumptions about how it is used, specifically
        // 1) This class will only reside on the stack.
        // 2) Components that consume this object have well-defined reference lifetimes.
        //    In this case, this is only consumed by the file dialog advise and unadvise.
        //    Unadvising will release the file dialog's only reference to this object.
        //
        // Do not do this for heap allocated objects.
        IFACEMETHODIMP_(ULONG) AddRef() { return 3; }
        IFACEMETHODIMP_(ULONG) Release() { return 2; }
    
        // IFileDialogEvents
        IFACEMETHODIMP OnFileOk(IFileDialog* pfd)
        {
            // if this button is in the "Add" mode then do this, otherwise return S_OK
            IFileOpenDialog* pfod;
            HRESULT hr = pfd->QueryInterface(IID_PPV_ARGS(&pfod));
            if (SUCCEEDED(hr))
            {
                IShellItemArray* psia;
                hr = pfod->GetSelectedItems(&psia);
                if (SUCCEEDED(hr))
                {
                    ReportSelectedItems(pfd, psia);
                    psia->Release();
                }
                pfod->Release();
            }
            return S_FALSE; // S_FALSE keeps the dialog up; return S_OK to allow it to dismiss.
        }
    
        IFACEMETHODIMP OnFolderChanging(IFileDialog* /* pfd */, IShellItem* /* psi */)
        {
            return E_NOTIMPL;
        }
    
        IFACEMETHODIMP OnFolderChange(IFileDialog* /* pfd */)
        {
            return E_NOTIMPL;
        }
    
        IFACEMETHODIMP OnSelectionChange(IFileDialog* pfd)
        {
            // Update the text of the Open/Add button here based on the selection
            IShellItem* psi;
            HRESULT hr = pfd->GetCurrentSelection(&psi);
            if (SUCCEEDED(hr))
            {
                SFGAOF attr;
                hr = psi->GetAttributes(SFGAO_FOLDER | SFGAO_STREAM, &attr);
                if (SUCCEEDED(hr) && (SFGAO_FOLDER == attr))
                {
                    pfd->SetOkButtonLabel(L"Open");
                }
                else
                {
                    pfd->SetOkButtonLabel(L"Add");
                }
                psi->Release();
            }
            return S_OK;
        }
    
        IFACEMETHODIMP OnShareViolation(IFileDialog* /* pfd */, IShellItem* /* psi */, FDE_SHAREVIOLATION_RESPONSE* /* pResponse */) { return E_NOTIMPL; }
        IFACEMETHODIMP OnTypeChange(IFileDialog* /* pfd */) { return E_NOTIMPL; }
        IFACEMETHODIMP OnOverwrite(IFileDialog* /* pfd */, IShellItem* /* psi */, FDE_OVERWRITE_RESPONSE* /* pResponse */) { return E_NOTIMPL; }
    
        // IFileDialogControlEvents
        IFACEMETHODIMP OnItemSelected(IFileDialogCustomize* /* pfdc */, DWORD /* dwIDCtl */, DWORD /* dwIDItem */) { return E_NOTIMPL; }
    
        IFACEMETHODIMP OnButtonClicked(IFileDialogCustomize* pfdc, DWORD dwIDCtl)
        {
            switch (dwIDCtl)
            {
            case c_idDone:
                IFileDialog* pfd;
                if (SUCCEEDED(pfdc->QueryInterface(&pfd)))
                {
                    pfd->Close(S_OK);
                    pfd->Release();
                }
                break;
    
            default:
                break;
            }
    
            return S_OK;
        }
    
        IFACEMETHODIMP OnCheckButtonToggled(IFileDialogCustomize* /* pfdc */, DWORD /* dwIDCtl */, BOOL /* bChecked */) { return E_NOTIMPL; }
        IFACEMETHODIMP OnControlActivating(IFileDialogCustomize* /* pfdc */, DWORD /* dwIDCtl */) { return E_NOTIMPL; }
    };
    
    // This sample demonstrates how to use the file dialog in a modal way such that
    // users can easily pick multiple files. It does this by overriding the normal "Open" button
    // with an "Add" button that passes the selection back to this app.
    //
    // One case this sample does not support is selecting folders this way. This has
    // the issue of the "Open" button being overloaded for "navigate into the folder" and "add the folder."
    // One way to deal with this is to add a new button, "Add Folder", the PickFilesAndFolders sample demonstrates this.
    void FileOpenBasketPicker()
    {
        IFileOpenDialog* pfd;
        if (SUCCEEDED(CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pfd))))
        {
            CFileOpenBasketPickerCallback foacb;
            DWORD dwCookie;
            if (SUCCEEDED(pfd->Advise(&foacb, &dwCookie)))
            {
                DWORD dwOptions;
                if (SUCCEEDED(pfd->GetOptions(&dwOptions)))
                {
                    pfd->SetOptions(dwOptions | FOS_ALLOWMULTISELECT | FOS_ALLNONSTORAGEITEMS);
                }
    
                IFileDialog2* pfd2;
                if (SUCCEEDED(pfd->QueryInterface(&pfd2)))
                {
                    pfd2->SetCancelButtonLabel(L"Done");
                    pfd2->Release();
                }
                else
                {
                    IFileDialogCustomize* pfdc;
                    if (SUCCEEDED(pfd->QueryInterface(&pfdc)))
                    {
                        pfdc->AddPushButton(c_idDone, L"Done");
                        pfdc->Release();
                    }
                }
    
                pfd->SetTitle(L"File Open Modal Basket Picker Sample");
    
                // We do not process the results of the dialog since
                // the selected items are passed back via OnFileOk()
                pfd->Show(NULL); // hr intentionally ignored
    
                pfd->Unadvise(dwCookie);
            }
            pfd->Release();
        }
    }
    
    /* Picking Files and Folders in Basket Mode **************************************************************************************/
    
    class CPickFilesAndFoldersCallback : public IFileDialogEvents, public IFileDialogControlEvents
    {
    public:
        CPickFilesAndFoldersCallback()
        {
        }
    
        // IUnknown
        IFACEMETHODIMP QueryInterface(REFIID riid, void** ppv)
        {
            static const QITAB qit[] = {
                QITABENT(CPickFilesAndFoldersCallback, IFileDialogEvents),
                QITABENT(CPickFilesAndFoldersCallback, IFileDialogControlEvents),
                { 0 },
            };
            return QISearch(this, qit, riid, ppv);
        }
    
        // This class makes special assumptions about how it is used, specifically
        // 1) This class will only reside on the stack.
        // 2) Components that consume this object have well-defined reference lifetimes.
        //    In this case, this is only consumed by the file dialog advise and unadvise.
        //    Unadvising will release the file dialog's only reference to this object.
        //
        // Do not do this for heap allocated objects.
        IFACEMETHODIMP_(ULONG) AddRef() { return 3; }
        IFACEMETHODIMP_(ULONG) Release() { return 2; }
    
        // IFileDialogEvents
        IFACEMETHODIMP OnFileOk(IFileDialog* pfd)
        {
            ReportSelectedItemsFromSite(pfd);
            return S_FALSE; // S_FALSE keeps the dialog up, return S_OK to allows it to dismiss
        }
    
        IFACEMETHODIMP OnFolderChanging(IFileDialog* /* pfd */, IShellItem* /* psi */)
        {
            return E_NOTIMPL;
        }
    
        IFACEMETHODIMP OnFolderChange(IFileDialog* /* pfd */)
        {
            return E_NOTIMPL;
        }
    
        IFACEMETHODIMP OnSelectionChange(IFileDialog* pfd)
        {
            // Design for the text of the "Add" button
            // ---------------------------------------
            // Single select item      "Add file"
            // Single select folder    "Add folder"
            // Multiselect             "Add items"
            // Null select             "Add current folder"
            IFileDialogCustomize* pfdc;
            if (SUCCEEDED(pfd->QueryInterface(&pfdc)))
            {
                // GetSelectionFromSite() fails on no selection
                // When that happens, default to the current folder.
                PCWSTR pszLabel = L"Add current folder";
                IShellItemArray* psia;
                if (SUCCEEDED(GetSelectionFromSite(pfd, FALSE, &psia)))
                {
                    DWORD count;
                    if (SUCCEEDED(psia->GetCount(&count)))
                    {
                        if (count == 1)
                        {
                            IShellItem* psi;
                            if (SUCCEEDED(psia->GetItemAt(0, &psi)))
                            {
                                SFGAOF attributes;
                                if (S_OK == psi->GetAttributes(SFGAO_FOLDER, &attributes))
                                {
                                    pszLabel = L"Add folder";
                                }
                                else
                                {
                                    pszLabel = L"Add file";
                                }
                                psi->Release();
                            }
                        }
                        else if (count > 1)
                        {
                            pszLabel = L"Add items";
                        }
                    }
                    psia->Release();
                }
                pfdc->SetControlLabel(c_idAdd, pszLabel);
                pfdc->Release();
            }
    
            return S_OK;
        }
    
        IFACEMETHODIMP OnShareViolation(IFileDialog* /* pfd */, IShellItem* /* psi */, FDE_SHAREVIOLATION_RESPONSE* /* pResponse */) { return E_NOTIMPL; }
        IFACEMETHODIMP OnTypeChange(IFileDialog* /* pfd */) { return E_NOTIMPL; }
        IFACEMETHODIMP OnOverwrite(IFileDialog* /* pfd */, IShellItem* /* psi */, FDE_OVERWRITE_RESPONSE* /* pResponse */) { return E_NOTIMPL; }
    
        // IFileDialogControlEvents
        IFACEMETHODIMP OnItemSelected(IFileDialogCustomize* /* pfdc */, DWORD /* dwIDCtl */, DWORD /* dwIDItem */) { return E_NOTIMPL; }
    
        IFACEMETHODIMP OnButtonClicked(IFileDialogCustomize* pfdc, DWORD dwIDCtl)
        {
            switch (dwIDCtl)
            {
            case c_idAdd:
                // Instead of using IFileDialog::GetCurrentSelection(), we need to get the
                // selection from the view to handle the "no selection implies folder" case
                ReportSelectedItemsFromSite(pfdc);
                break;
    
            case c_idDone:
            {
                IFileDialog* pfd;
                if (SUCCEEDED(pfdc->QueryInterface(&pfd)))
                {
                    pfd->Close(S_OK);
                    pfd->Release();
                }
            }
            break;
    
            default:
                break;
            }
    
            return S_OK;
        }
    
        IFACEMETHODIMP OnCheckButtonToggled(IFileDialogCustomize* /* pfdc */, DWORD /* dwIDCtl */, BOOL /* bChecked */) { return E_NOTIMPL; }
        IFACEMETHODIMP OnControlActivating(IFileDialogCustomize* /* pfdc */, DWORD /* dwIDCtl */) { return E_NOTIMPL; }
    };
    
    void PickFilesAndFolders()
    {
        IFileOpenDialog* pfd;
        if (SUCCEEDED(CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pfd))))
        {
            CPickFilesAndFoldersCallback foacb;
            DWORD dwCookie;
            if (SUCCEEDED(pfd->Advise(&foacb, &dwCookie)))
            {
                DWORD dwOptions;
                if (SUCCEEDED(pfd->GetOptions(&dwOptions)))
                {
                    pfd->SetOptions(dwOptions | FOS_ALLOWMULTISELECT | FOS_ALLNONSTORAGEITEMS);
                }
    
                IFileDialogCustomize* pfdc;
                if (SUCCEEDED(pfd->QueryInterface(&pfdc)))
                {
                    // The spacing pads the button a bit.
                    pfdc->AddPushButton(c_idAdd, L" Add current folder ");
                    pfdc->Release();
                }
    
                IFileDialog2* pfd2;
                if (SUCCEEDED(pfd->QueryInterface(&pfd2)))
                {
                    pfd2->SetCancelButtonLabel(L"Done");
                    pfd2->Release();
                }
                else
                {
                    // pre Win7 we need to add a 3rd button, ugly but workable
                    IFileDialogCustomize* pfdc;
                    if (SUCCEEDED(pfd->QueryInterface(&pfdc)))
                    {
                        pfdc->AddPushButton(c_idDone, L"Done");
                        pfdc->Release();
                    }
                }
    
                pfd->SetTitle(L"Pick Files and Folder Sample");
    
                // the items selected are passed back via OnFileOk()
                // so we don't process the results of the dialog
                pfd->Show(NULL); // hr intentionally ignored
                pfd->Unadvise(dwCookie);
            }
            pfd->Release();
        }
    }
    
    // Application entry point
    //int APIENTRY wWinMain(HINSTANCE, HINSTANCE, PWSTR, int)
    int main()
    {
        HRESULT hr = OleInitialize(0);
        if (SUCCEEDED(hr))
        {
            TASKDIALOGCONFIG taskDialogParams = { sizeof(taskDialogParams) };
            taskDialogParams.dwFlags = TDF_USE_COMMAND_LINKS | TDF_ALLOW_DIALOG_CANCELLATION;
    
            TASKDIALOG_BUTTON const buttons[] =
            {
                { IDC_PICKITEM,             L"Pick File" },
                { IDC_PICKCONTAINER,        L"Pick Folder" },
                { IDC_FILEOPENBASKETPICKER, L"Pick Files (Basket Mode)" },
                { IDC_PICKFILESANDFOLDERS,  L"Pick Files and Folders (Basket Mode)" },
            };
    
            taskDialogParams.pButtons = buttons;
            taskDialogParams.cButtons = ARRAYSIZE(buttons);
            taskDialogParams.pszMainInstruction = L"Pick the file dialog samples you want to try";
            taskDialogParams.pszWindowTitle = L"Common File Dialog Modes";
    
            while (SUCCEEDED(hr))
            {
                int selectedId;
                hr = TaskDialogIndirect(&taskDialogParams, &selectedId, NULL, NULL);
                if (SUCCEEDED(hr))
                {
                    if (selectedId == IDCANCEL)
                    {
                        break;
                    }
                    else if (selectedId == IDC_PICKITEM)
                    {
                        PickItem();
                    }
                    else if (selectedId == IDC_PICKCONTAINER)
                    {
                        PickContainer();
                    }
                    else if (selectedId == IDC_FILEOPENBASKETPICKER)
                    {
                        FileOpenBasketPicker();
                    }
                    else if (selectedId == IDC_PICKFILESANDFOLDERS)
                    {
                        PickFilesAndFolders();
                    }
                }
            }
            OleUninitialize();
        }
        return 0;
    }

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