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window程序设计建立的窗口不能显示？？？求帮助

以下是代码，麻烦懂的看一下哈。。用的是vc2008
#include<windows.h>
#include"resource.h"
#include"stdafx.h"
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);    
int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
      TCHAR szAppName[]=TEXT("自己创建的窗口");   
      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,
         TEXT("window窗口创建"),   
         WS_OVERLAPPEDWINDOW,
         CW_USEDEFAULT,
         CW_USEDEFAULT,
         CW_USEDEFAULT,
         CW_USEDEFAULT,
         NULL,                 



         NULL,            
         hInstance,   
         NULL);
     ShowWindow(hwnd,nCmdShow);        
     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)        
{                 
     switch (message)        
     {
     case WM_PAINT:
         {
         HDC hdc;
         PAINTSTRUCT ps;
         hdc=BeginPaint(hwnd,&ps);
        
         EndPaint(hwnd,&ps);
         break;
         }
     case WM_LBUTTONDOWN:
         {
             MessageBeep(0);
             break;
         }
     case WM_DESTROY:
         {
             PostQuitMessage(0);
             break;
         }
defaut:
         return DefWindowProc(hwnd,message,wParam,lParam);
        
     }
     return 0;
}


试试看把CALLBACK函数最后的return 0改成这个.return DefWindowProc(hwnd,message,wParam,lParam);
switch里面的这个删除.


有显示了，呵呵。。。。。。


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