#include<windows.h>
HINSTANCE hInstance;
HINSTANCE hInst;
MSG msg;
char lpszClassName[]=\"窗口\";
char *ShowText;
LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);
              
class CCmdTarget
{
 public:
  HWND hWnd;
  LRESULT CALLBACK AfxWndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);
  virtual void OnLButtonDown();
  void OnDraw(HDC hdc);//这里为何不用virtual呢？
  virtual void OnDestroy();
};
//
LRESULT CALLBACK CCmdTarget::AfxWndProc(HWND hWnd,UINT message,
              WPARAM wParam,LPARAM lParam)
{
 switch(message)
 {
  case WM_LBUTTONDOWN:
   OnLButtonDown();
   break;
  case WM_PAINT:
 &nb……