窗口子类化

#include <windows.h>

#define ID_EDIT     1

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK NewWndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);
WNDPROC OldWndProc;
static HINSTANCE hIns;
char temp[505];

TCHAR szAppName[] = TEXT ("Lab11") ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     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 ("Failed to RegisterClass!"),
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName, szAppName,
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;
     
     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)
{
     static HWND hwndEdit ;
     
     switch (message)
     {
     case WM_CREATE :
          hIns=((LPCREATESTRUCT)lParam)->hInstance;
          hwndEdit = CreateWindow (TEXT ("edit"), NULL,
                         WS_CHILD | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL |
                                   WS_BORDER | ES_LEFT | ES_MULTILINE |
                                   ES_AUTOHSCROLL | ES_AUTOVSCROLL,
                         0, 0, 0, 0, hwnd, (HMENU) ID_EDIT,
                         ((LPCREATESTRUCT) lParam) -> hInstance, NULL) ;
          OldWndProc=(WNDPROC)SetWindowLong(hwndEdit,GWL_WNDPROC,(long)NewWndProc);
          return 0 ;
          
     case WM_SETFOCUS :
          SetFocus (hwndEdit) ;
          return 0 ;
          
     case WM_SIZE :
          MoveWindow (hwndEdit, 0, 0, LOWORD (lParam), HIWORD (lParam), TRUE) ;
          return 0 ;
          
     case WM_COMMAND :
          if (LOWORD (wParam) == ID_EDIT){
               if (HIWORD (wParam) == EN_ERRSPACE ||
                         HIWORD (wParam) == EN_MAXTEXT)

                    MessageBox (hwnd, TEXT ("Edit control out of space."),
                                szAppName, MB_OK | MB_ICONSTOP) ;
          }
          
          return 0 ;
               
     case WM_DESTROY :
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
    
}
POINT p;
char num[][10]={"January","September"};

LRESULT CALLBACK NewWndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)

{
    HMENU hMenu,hMenuTrackPopup;
    switch(message){
    case WM_KEYDOWN:
        switch(wParam){
        case VK_F1:
            MessageBox (hWnd, TEXT ("需要的信息!"),szAppName, MB_OK | MB_ICONINFORMATION) ;
            break;
        }
        break;
    case WM_RBUTTONDOWN:

        hMenu=LoadMenu(hIns,MAKEINTRESOURCE(101));
        hMenuTrackPopup=GetSubMenu(hMenu,0);
        p.x=LOWORD(lParam);
        p.y=HIWORD(lParam);
        ClientToScreen(hWnd,&p);
        TrackPopupMenu(hMenuTrackPopup,TPM_TOPALIGN|TPM_LEFTALIGN,p.x,p.y,0,hWnd,0);

        break;
    case WM_COMMAND:
        switch(LOWORD(wParam)){
          case 40001:
              memset(temp,0,sizeof(temp));
              SendMessageA(hWnd,WM_GETTEXT,500,(LPARAM)&temp);
              strcat(temp,num[0]);
              SendMessageA(hWnd,WM_SETTEXT,500,(LPARAM)&temp);
              //MessageBox (hWnd, TEXT ("1"),szAppName, MB_OK | MB_ICONINFORMATION) ;
              break;
          case 40002:
              //MessageBox (hWnd, TEXT ("2"),szAppName, MB_OK | MB_ICONINFORMATION) ;
              memset(temp,0,sizeof(temp));
              SendMessageA(hWnd,WM_GETTEXT,500,(LPARAM)&temp);
              strcat(temp,num[1]);
              SendMessageA(hWnd,WM_SETTEXT,500,(LPARAM)&temp);
              break;
          }
        break;
    }

   return CallWindowProc(OldWndProc,hWnd,message,wParam,lParam);

}