下面的程序，在VC++中运行下。为什么不出现窗口呢》帮忙看看错那了。

谢谢各位了。新手刚学！！！！！！！


#include <windows.h>
#include <windowsx.h>
LRESULT CALLBACK WinProc(HWND hwnd,
                         UINT msg,
                         WPARAM wparam,
                         LPARAM lparam)
{
   switch (msg)   //msg中保存的就是正要处理的消息
   {
      case WM_DESTROY:      //这是我们自行处理的第一个消息
      {
          PostQuitMessage(0);   //发出一个WM_QUIT消息
          return 0;             //然后直接返回。
       }break;
  default:break;
  }
   return DefWindowProc(hwnd, msg, wparam, lparam);
}

int WINAPI WinMain(HINSTANCE hinstance,
                 HINSTANCE hprevinstance,
                 LPSTR lpcmdline,
                 int nCmdShow)
{
       HWND hWnd;
       MSG msg;
       WNDCLASSEX wndclass;  
     wndclass.cbSize = sizeof(WNDCLASSEX);
     wndclass.cbClsExtra=0;
     wndclass.cbWndExtra =0;
     wndclass.lpfnWndProc = WinProc;
     wndclass.style = CS_VREDRAW | CS_HREDRAW | CS_OWNDC | CS_DBLCLKS;
     wndclass.hInstance = hinstance;
     wndclass.hCursor =LoadCursor(NULL, IDC_ARROW);
     wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION); 
     
     wndclass.lpszMenuName = NULL;
     wndclass.hbrBackground =(HBRUSH) GetStockObject(BLACK_BRUSH);
     wndclass.lpszClassName ="WINCLASS1";
   //
    hWnd=CreateWindowEx(NULL,"WINCLASS1",
                "这是我的第一个窗口",
                WS_OVERLAPPEDWINDOW|WS_VISIBLE ,
                CW_USEDEFAULT, 0,
                400,400,
                NULL,
                NULL,
                hinstance,
                NULL );
    if (!hWnd)
        return 0;
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);
    while(GetMessage(&msg, NULL, 0, 0)) 
    {       
      TranslateMessage(&msg);    
      DispatchMessage(&msg); 
    }  
  return 0;    
}