Windows程序设计3-1 PlaySound 无法解析的外部符号

秒速五厘米 2022-05-12 11:44 106阅读 0赞

原程序缺少一行

\#pragma comment(lib, "Winmm.lib")

因为作者在下文已经说了，要link一下，不过我看的时候没有往下看纠结了好久

改过的程序如下

#pragma comment(lib, "Winmm.lib")
    #include<Windows.h>
    
    LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
    
    int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow){
    
    	static TCHAR szAppName[]=TEXT("HelloWin");
    	HWND hwnd;
    	MSG msg;
    	WNDCLASS wndclass;
    
    	wndclass.style =  CS_HREDRAW  |  CS_VREDRAW  ;  
    	wndclass.lpfnWndProc  =  WndProc ;  
    	wndclass.cbClsExtra = 0 ;  
    	wndclass.cbWndExtra = 0 ;  
    	wndclass.hInstance =  hInstance ;  
    	wndclass.hIcon =  LoadIcon  (NULL, IDI_APPLICATION ) ;  
    	wndclass.hCursor =  LoadCursor  (NULL, IDC_ARROW) ;  
    	wndclass.hbrBackground = ( HBRUSH ) GetStockObject (WHITE_BRUSH ) ;  
    	wndclass.lpszMenuName =  NULL ;  
    	wndclass.lpszClassName = szAppName ;  
    	 
    	if (! RegisterClass  (&wndclass))  
    	{  
    		MessageBox  (  NULL, TEXT ("This program requires Windows NT!" ),  
    								szAppName, MB_ICONERROR) ;  
    		return 0 ;  
    	 }  
    	hwnd =  CreateWindow( szAppName, // window class name  
    				 TEXT ("The Hello Program"),  // window caption   
    				WS_OVERLAPPEDWINDOW, // window style  
    				CW_USEDEFAULT ,// initial x position  
    				CW_USEDEFAULT ,// initial y position  
    				CW_USEDEFAULT ,// initial x size   
    				CW_USEDEFAULT ,// initial y size   
    			    NULL, // parent window handle  
    				NULL, // window menu handle  
    				hInstance, // program instance handle  
    				NULL) ; // creation parameters     
    	ShowWindow  (hwnd, iCmdShow ) ;  
    	UpdateWindow (hwnd) ;  
       
    	while (GetMessage (& msg , NULL, 0, 0))  
    	{  
    		TranslateMessage (&msg ) ;  
    		DispatchMessage (&msg ) ;  
    	}  
    	return msg . wParam ;
    
    }
    
    LRESULT CALLBACK  WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM  lParam) 
    {  
    	HDC  hdc  ;  
    	PAINTSTRUCT ps ;  
    	RECT  rect ;    
    	switch ( message)  
    	{  
    		case  WM_CREATE:  
    			PlaySound(TEXT("hellowin.wav"),NULL,SND_FILENAME|SND_ASYNC);
    			return 0 ;      
    		case  WM_PAINT :  
    			hdc  =  BeginPaint (hwnd, &ps) ;  
    			GetClientRect(hwnd, &rect) ;  
    			DrawText  (hdc , TEXT ("Hello, Windows 8!" ), -1, &rect,  
    								DT_SINGLELINE  |  DT_CENTER |  DT_VCENTER ) ;  
    			EndPaint  (hwnd, &ps) ;  
    			return 0 ;  
    		case  WM_DESTROY:  
    			PostQuitMessage (0) ;  
    			return 0 ;  
    	}  
    	return DefWindowProc (hwnd, message, wParam , lParam ) ;
    }