#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 calss 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 XP!"),-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);
}
由于使用了PlaySound()函数，在 Object/Library Modules 文字方块添加winmm.lib ,但是程序仍然运行不起来，请问这是怎么回事