《windows 程序设计》3.1.2

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不知怎么读工程文件夹下的还！！！！！

当出现这样的情况时:

error LNK2019: 无法解析的外部符号 __imp__PlaySoundW@12，该符号在函数 "long __stdcall WndProc(struct HWND__ *,unsigned int,unsigned int,long)" (?WndProc@@YGJPAUHWND__@@IIJ@Z) 中被引用

在源程序开头加:

#include<mmsystem.h> 使用的音频设备和声音文件操作函数的声明包含在mmsystem.h头文件中
#pragma comment(lib,"winmm.lib") 程序中用到了多媒体链接库,而内定的项目中又不包括多媒体链接库文件,所以会报错.

#include <windows.h>#include<mmsystem.h> #pragma comment(lib,"winmm.lib")LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow){static TCHAR szAppName[] = TEXT ("HelloCamera");HWNDhwnd;MSGmsg;WNDCLASSwndclass;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, TEXT ("The Hello Program"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);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){HDChdc;PAINTSTRUCTps;RECTrect;switch (message){case WM_CREATE:PlaySound (TEXT ("tada.wav"), NULL, SND_FILENAME | SND_ASYNC);return 0;case WM_PAINT:hdc = BeginPaint (hwnd, &ps);GetClientRect (hwnd, &rect);DrawText (hdc, TEXT ("WangLj"), -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);}