#include <iostream.h>
#include <windows.h>


LRESULT CALLBACK WinMainProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);




int WINAPI WinMain(
  HINSTANCE hInstance,  // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,      // pointer to command line
  int nCmdShow          // show state of window
)
{
    WNDCLASS wndclass;
    wndclass.cbClsExtra=0;
    wndclass.cbWndExtra=0;
    wndclass.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
    wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
    wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wndclass.hInstance=hInstance;
    wndclass.lpfnWndProc=WinMainProc;
    wndclass.lpszClassName="WinMain";
    wndclass.lpszMenuName=NULL;
    wndclass.style=CS_HREDRAW | CS_VREDRAW;



    RegisterClass(&wndclass);

    HWND hWnd;
    hWnd=CreateWindow("WinMain","颜从",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,
        CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);

    ShowWindow(hWnd,SW_SHOWNORMAL);
    UpdateWindow(hWnd);

    MSG msg;
    while(GetMessage(&msg,hWnd,0,0));
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}
LRESULT CALLBACK WinMainProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
    switch(uMsg)
    {
    case WM_LBUTTONDOWN:
        MessageBox(NULL,"DDDD","BBBBBB",0);
        break;
    case WM_CLOSE:
        if(IDYES==MessageBox(NULL,"dddddddd","ddddddd",0));
        DestroyWindow(hwnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd,uMsg,wParam,lParam);
    }
    return 0;
}

CreateWindow错误吧，窗口的长和宽不能用CW_USEDEFAULT来代替，需要具体的数子，如400*300之类的。。。

问题在于 while(GetMessage(&msg,hWnd,0,0));改成while(GetMessage(&msg,NULL,0,0))
就可以了,这个里,从所有的消息里得到WM_QUIT消息,不能从hWnd里,窗口都没有了,所以就不行