字符串转化2

ゞ浴缸里的玫瑰 2021-11-02 14:08 267阅读 0赞

转贴自：

[http://hi.baidu.com/greatren518/blog/item/ae8ec0113234b774ca80c4ca.html][http_hi.baidu.com_greatren518_blog_item_ae8ec0113234b774ca80c4ca.html]

本主题演示如何将各种 C++ 字符串类型转换为其他字符串。可以转换的字符串类型包括 char \*、wchar\_t\*、\_bstr\_t、CComBSTR、CString、basic\_string 和 System.String。在所有情况下，在将字符串转换为新类型时，都会创建字符串的副本。对新字符串进行的任何更改都不会影响原始字符串，反之亦然。  
从 char \* 转换  
示例  
说明  
此示例演示如何从 char \* 转换为上面列出的其他字符串类型。  
// convert\_from\_char.cpp

// compile with /clr /link comsuppw.lib

\#include <iostream>

\#include <stdlib.h>

\#include <string>

\#include "atlbase.h"

\#include "atlstr.h"

\#include "comutil.h"

using namespace std;

using namespace System;

int main()

char \*orig = "Hello, World!";

cout << orig << " (char \*)" << endl;

// Convert to a wchar\_t\*

size\_t origsize = strlen(orig) + 1;

const size\_t newsize = 100;

size\_t convertedChars = 0;

wchar\_t wcstring\[newsize\];

mbstowcs\_s(&convertedChars, wcstring, origsize, orig, \_TRUNCATE);

wcscat\_s(wcstring, L" (wchar\_t \*)");

wcout << wcstring << endl;

// Convert to a \_bstr\_t

\_bstr\_t bstrt(orig);

bstrt += " (\_bstr\_t)";

cout << bstrt << endl;

// Convert to a CComBSTR

CComBSTR ccombstr(orig);

if (ccombstr.Append(L" (CComBSTR)") == S\_OK)

CW2A printstr(ccombstr);

cout << printstr << endl;

// Convert to a CString

CString cstring(orig);

cstring += " (CString)";

cout << cstring << endl;

// Convert to a basic\_string

string basicstring(orig);

basicstring += " (basic\_string)";

cout << basicstring << endl;

// Convert to a System::String

String ^systemstring = gcnew String(orig);

systemstring += " (System::String)";

Console::WriteLine("\{0\}", systemstring);

delete systemstring;

\}  
输出  
Hello, World! (char \*)

Hello, World! (wchar\_t \*)

Hello, World! (\_bstr\_t)

Hello, World! (CComBSTR)

Hello, World! (CString)

Hello, World! (basic\_string)

Hello, World! (System::String)  
从 wchar\_t \* 转换  
示例  
说明  
此示例演示如何从 wchar\_t \* 转换为上面列出的其他字符串类型。  
// convert\_from\_wchar\_t.cpp

// compile with /clr /link comsuppw.lib

\#include <iostream>

\#include <stdlib.h>

\#include <string>

\#include "atlbase.h"

\#include "atlstr.h"

\#include "comutil.h"

using namespace std;

using namespace System;

int main()

wchar\_t \*orig = L"Hello, World!";

wcout << orig << L" (wchar\_t \*)" << endl;

// Convert to a char\*

size\_t origsize = wcslen(orig) + 1;

const size\_t newsize = 100;

size\_t convertedChars = 0;

char nstring\[newsize\];

wcstombs\_s(&convertedChars, nstring, origsize, orig, \_TRUNCATE);

strcat\_s(nstring, " (char \*)");

cout << nstring << endl;

// Convert to a \_bstr\_t

\_bstr\_t bstrt(orig);

bstrt += " (\_bstr\_t)";

cout << bstrt << endl;

// Convert to a CComBSTR

CComBSTR ccombstr(orig);

if (ccombstr.Append(L" (CComBSTR)") == S\_OK)

CW2A printstr(ccombstr);

cout << printstr << endl;

// Convert to a CString

CString cstring(orig);

cstring += " (CString)";

cout << cstring << endl;

// Convert to a basic\_string

wstring basicstring(orig);

basicstring += L" (basic\_string)";

wcout << basicstring << endl;

// Convert to a System::String

String ^systemstring = gcnew String(orig);

systemstring += " (System::String)";

Console::WriteLine("\{0\}", systemstring);

delete systemstring;

\}  
输出  
Hello, World! (wchar\_t \*)

Hello, World! (char \*)

Hello, World! (\_bstr\_t)

Hello, World! (CComBSTR)

Hello, World! (CString)

Hello, World! (basic\_string)

Hello, World! (System::String)  
从 \_bstr\_t 转换  
示例  
说明  
此示例演示如何从 \_bstr\_t 转换为上面列出的其他字符串类型。  
// convert\_from\_bstr\_t.cpp

// compile with /clr /link comsuppw.lib

\#include <iostream>

\#include <stdlib.h>

\#include <string>

\#include "atlbase.h"

\#include "atlstr.h"

\#include "comutil.h"

using namespace std;

using namespace System;

int main()

\_bstr\_t orig("Hello, World!");

wcout << orig << " (\_bstr\_t)" << endl;

// Convert to a char\*

const size\_t newsize = 100;

char nstring\[newsize\];

strcpy\_s(nstring, (char \*)orig);

strcat\_s(nstring, " (char \*)");

cout << nstring << endl;

// Convert to a wchar\_t\*

wchar\_t wcstring\[newsize\];

wcscpy\_s(wcstring, (wchar\_t \*)orig);

wcscat\_s(wcstring, L" (wchar\_t \*)");

wcout << wcstring << endl;

// Convert to a CComBSTR

CComBSTR ccombstr((char \*)orig);

if (ccombstr.Append(L" (CComBSTR)") == S\_OK)

CW2A printstr(ccombstr);

cout << printstr << endl;

// Convert to a CString

CString cstring((char \*)orig);

cstring += " (CString)";

cout << cstring << endl;

// Convert to a basic\_string

string basicstring((char \*)orig);

basicstring += " (basic\_string)";

cout << basicstring << endl;

// Convert to a System::String

String ^systemstring = gcnew String((char \*)orig);

systemstring += " (System::String)";

Console::WriteLine("\{0\}", systemstring);

delete systemstring;

\}  
输出  
Hello, World! (\_bstr\_t)

Hello, World! (char \*)

Hello, World! (wchar\_t \*)

Hello, World! (CComBSTR)

Hello, World! (CString)

Hello, World! (basic\_string)

Hello, World! (System::String)  
从 CComBSTR 转换  
示例  
说明  
此示例演示如何从 CComBSTR 转换为上面列出的其他字符串类型。  
// convert\_from\_ccombstr.cpp

// compile with /clr /link comsuppw.lib

\#include <iostream>

\#include <stdlib.h>

\#include <string>

\#include "atlbase.h"

\#include "atlstr.h"

\#include "comutil.h"

\#include "vcclr.h"

using namespace std;

using namespace System;

using namespace System::Runtime::InteropServices;

int main()

CComBSTR orig("Hello, World!");

CW2A printstr(orig);

cout << printstr << " (CComBSTR)" << endl;

// Convert to a char\*

const size\_t newsize = 100;

char nstring\[newsize\];

CW2A tmpstr1(orig);

strcpy\_s(nstring, tmpstr1);

strcat\_s(nstring, " (char \*)");

cout << nstring << endl;

// Convert to a wchar\_t\*

wchar\_t wcstring\[newsize\];

wcscpy\_s(wcstring, orig);

wcscat\_s(wcstring, L" (wchar\_t \*)");

wcout << wcstring << endl;

// Convert to a \_bstr\_t

\_bstr\_t bstrt(orig);

bstrt += " (\_bstr\_t)";

cout << bstrt << endl;

// Convert to a CString

CString cstring(orig);

cstring += " (CString)";

cout << cstring << endl;

// Convert to a basic\_string

wstring basicstring(orig);

basicstring += L" (basic\_string)";

wcout << basicstring << endl;

// Convert to a System::String

String ^systemstring = gcnew String(orig);

systemstring += " (System::String)";

Console::WriteLine("\{0\}", systemstring);

delete systemstring;

\}  
输出  
Hello, World! (CComBSTR)

Hello, World! (char \*)

Hello, World! (wchar\_t \*)

Hello, World! (\_bstr\_t)

Hello, World! (CString)

Hello, World! (basic\_string)

Hello, World! (System::String)  
从 CString 转换  
示例  
说明  
此示例演示如何从 CString 转换为上面列出的其他字符串类型。  
// convert\_from\_cstring.cpp

// compile with /clr /link comsuppw.lib

\#include <iostream>

\#include <stdlib.h>

\#include <string>

\#include "atlbase.h"

\#include "atlstr.h"

\#include "comutil.h"

using namespace std;

using namespace System;

int main()

CString orig("Hello, World!");

wcout << orig << " (CString)" << endl;

// Convert to a char\*

const size\_t newsize = 100;

char nstring\[newsize\];

strcpy\_s(nstring, orig);

strcat\_s(nstring, " (char \*)");

cout << nstring << endl;

// Convert to a wchar\_t\*

// You must first convert to a char \* for this to work.

size\_t origsize = strlen(orig) + 1;

size\_t convertedChars = 0;

wchar\_t wcstring\[newsize\];

mbstowcs\_s(&convertedChars, wcstring, origsize, orig, \_TRUNCATE);

wcscat\_s(wcstring, L" (wchar\_t \*)");

wcout << wcstring << endl;

// Convert to a \_bstr\_t

\_bstr\_t bstrt(orig);

bstrt += " (\_bstr\_t)";

cout << bstrt << endl;

// Convert to a CComBSTR

CComBSTR ccombstr(orig);

if (ccombstr.Append(L" (CComBSTR)") == S\_OK)

CW2A printstr(ccombstr);

cout << printstr << endl;

// Convert to a basic\_string

string basicstring(orig);

basicstring += " (basic\_string)";

cout << basicstring << endl;

// Convert to a System::String

String ^systemstring = gcnew String(orig);

systemstring += " (System::String)";

Console::WriteLine("\{0\}", systemstring);

delete systemstring;

\}  
输出  
Hello, World! (CString)

Hello, World! (char \*)

Hello, World! (wchar\_t \*)

Hello, World! (\_bstr\_t)

Hello, World! (CComBSTR)

Hello, World! (basic\_string)

Hello, World! (System::String)  
从 basic\_string 转换  
示例  
说明  
此示例演示如何从 basic\_string 转换为上面列出的其他字符串类型。  
// convert\_from\_basic\_string.cpp

// compile with /clr /link comsuppw.lib

\#include <iostream>

\#include <stdlib.h>

\#include <string>

\#include "atlbase.h"

\#include "atlstr.h"

\#include "comutil.h"

using namespace std;

using namespace System;

int main()

string orig("Hello, World!");

cout << orig << " (basic\_string)" << endl;

// Convert to a char\*

const size\_t newsize = 100;

char nstring\[newsize\];

strcpy\_s(nstring, orig.c\_str());

strcat\_s(nstring, " (char \*)");

cout << nstring << endl;

// Convert to a wchar\_t\*

// You must first convert to a char \* for this to work.

size\_t origsize = strlen(orig.c\_str()) + 1;

size\_t convertedChars = 0;

wchar\_t wcstring\[newsize\];

mbstowcs\_s(&convertedChars, wcstring, origsize, orig.c\_str(), \_TRUNCATE);

wcscat\_s(wcstring, L" (wchar\_t \*)");

wcout << wcstring << endl;

// Convert to a \_bstr\_t

\_bstr\_t bstrt(orig.c\_str());

bstrt += " (\_bstr\_t)";

cout << bstrt << endl;

// Convert to a CComBSTR

CComBSTR ccombstr(orig.c\_str());

if (ccombstr.Append(L" (CComBSTR)") == S\_OK)

CW2A printstr(ccombstr);

cout << printstr << endl;

// Convert to a CString

CString cstring(orig.c\_str());

cstring += " (CString)";

cout << cstring << endl;

// Convert to a System::String

String ^systemstring = gcnew String(orig.c\_str());

systemstring += " (System::String)";

Console::WriteLine("\{0\}", systemstring);

delete systemstring;

\}  
输出  
Hello, World! (basic\_string)

Hello, World! (char \*)

Hello, World! (wchar\_t \*)

Hello, World! (\_bstr\_t)

Hello, World! (CComBSTR)

Hello, World! (CString)

Hello, World! (System::String)  
从 System::String 转换  
示例  
说明  
此示例演示如何从 System.String 转换为上面列出的其他字符串类型。  
// convert\_from\_system\_string.cpp

// compile with /clr /link comsuppw.lib

\#include <iostream>

\#include <stdlib.h>

\#include <string>

\#include "atlbase.h"

\#include "atlstr.h"

\#include "comutil.h"

\#include "vcclr.h"

using namespace std;

using namespace System;

using namespace System::Runtime::InteropServices;

int main()

String ^orig = gcnew String("Hello, World!");

Console::WriteLine("\{0\} (System::String)", orig);

pin\_ptr<const wchar\_t> wch = PtrToStringChars(orig);

// Convert to a char\*

size\_t origsize = wcslen(wch) + 1;

const size\_t newsize = 100;

size\_t convertedChars = 0;

char nstring\[newsize\];

wcstombs\_s(&convertedChars, nstring, origsize, wch, \_TRUNCATE);

strcat\_s(nstring, " (char \*)");

cout << nstring << endl;

// Convert to a wchar\_t\*

wchar\_t wcstring\[newsize\];

wcscpy\_s(wcstring, wch);

wcscat\_s(wcstring, L" (wchar\_t \*)");

wcout << wcstring << endl;

// Convert to a \_bstr\_t

\_bstr\_t bstrt(wch);

bstrt += " (\_bstr\_t)";

cout << bstrt << endl;

// Convert to a CComBSTR

CComBSTR ccombstr(wch);

if (ccombstr.Append(L" (CComBSTR)") == S\_OK)

CW2A printstr(ccombstr);

cout << printstr << endl;

// Convert to a CString

CString cstring(wch);

cstring += " (CString)";

cout << cstring << endl;

// Convert to a basic\_string

wstring basicstring(wch);

basicstring += L" (basic\_string)";

wcout << basicstring << endl;

delete orig;

\}  
输出  
Hello, World! (System::String)

Hello, World! (char \*)

Hello, World! (wchar\_t \*)

Hello, World! (\_bstr\_t)

Hello, World! (CComBSTR)

Hello, World! (CString)

Hello, World! (basic\_string)

转载于:https://www.cnblogs.com/livenn/archive/2009/11/04/1595684.html

[http_hi.baidu.com_greatren518_blog_item_ae8ec0113234b774ca80c4ca.html]: http://hi.baidu.com/greatren518/blog/item/ae8ec0113234b774ca80c4ca.html

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