12. 剪贴簿.txt

本书介绍了在Microsoft Windows 98、Microsoft Windows NT 4.0和Windows NT 5.0下程序写作的方法

        
           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                = szAppName ;
        
           wndclass.lpszClassName               = szAppName ;
        

           if (!RegisterClass (&wndclass))
        
    {
        
                  MessageBox (  NULL, TEXT ("This program requires Windows NT!"),
        
                                                                        szAppName, MB_ICONERROR) ;
        
                  return 0 ;
        
    }
        
   
        
           hwnd = CreateWindow (szAppName, szCaption,
        
                         WS_OVERLAPPEDWINDOW,
        
                         CW_USEDEFAULT, CW_USEDEFAULT,
        
                         CW_USEDEFAULT, CW_USEDEFAULT,
        
                        NULL, NULL, hInstance, NULL) ;
        
   
        
           ShowWindow (hwnd, iCmdShow) ;
        
           UpdateWindow (hwnd) ;
        
    hAccel = LoadAccelerators (hInstance, szAppName) ;
        

           while (GetMessage (&msg, NULL, 0, 0))
        
           {
        
                  if (!TranslateAccelerator (hwnd, hAccel, &msg))
        
         {
        
                                  TranslateMessage (&msg) ;
        
                                  DispatchMessage (&msg) ;
        
                  }
        
  }
        
           return msg.wParam ;
        
}
        

LRESULT CALLBACK WndProc ( HWND hwnd, UINT message, WPARAM wParam,LPARAM lParam)
        
{
        
           static PTSTR          pText ;
        
           BOOL                  bEnable ;
        
           HGLOBAL               hGlobal ;
        
           HDC                   hdc ;
        
           PTSTR                 pGlobal ;
        
           PAINTSTRUCT           ps ;
        
           RECT                  rect ;
        
   
        
  switch (message)
        
           {
        
           case   WM_CREATE:
        
                  SendMessage (hwnd, WM_COMMAND, IDM_EDIT_RESET, 0) ;
        
                  return 0 ;
        

   case   WM_INITMENUPOPUP:
        
                  EnableMenuItem        ((HMENU)      wParam,IDM_EDIT_PASTE,
        
                          IsClipboardFormatAvailable    (CF_TCHAR) ? MF_ENABLED    : MF_GRAYED) ;
        

                  bEnable = pText ? MF_ENABLED : MF_GRAYED ;
        

                  EnableMenuItem        ((HMENU)      wParam,IDM_EDIT_CUT,     bEnable) ;
        
                  EnableMenuItem        ((HMENU)      wParam,IDM_EDIT_COPY,    bEnable) ;
        
                  EnableMenuItem        ((HMENU)      wParam,IDM_EDIT_CLEAR,bEnable) ;
        
                  break ;
        
        
        
           case   WM_COMMAND:
        
                  switch (LOWORD (wParam))
        
                  {
        
                  case   IDM_EDIT_PASTE:
        
                                         OpenClipboard (hwnd) ;
        

                                         if     (hGlobal = GetClipboardData (CF_TCHAR))
        
                                         {
        
                                                        pGlobal = GlobalLock (hGlobal) ;
        
                                                 if (pText)
        
                                                {
        
                                                                        free (pText) ;
        
                                                                        pText = NULL ;
        
                                                 }
        
                                                 pText = malloc (GlobalSize (hGlobal)) ;
        
                                                 lstrcpy (pText, pGlobal) ;
        
                                                InvalidateRect (hwnd, NULL, TRUE) ;
        
                                         }
        
                                         CloseClipboard () ;
        
                                         return 0 ;
        

                  case   IDM_EDIT_CUT:
        
                  case   IDM_EDIT_COPY:
        
                                         if (!pText)
        
                                                 return 0 ;
        

                                         hGlobal = GlobalAlloc (GHND | GMEM_SHARE,
        
                           (lstrlen (pText) + 1) * sizeof (TCHAR)) ;
        
                                         pGlobal = GlobalLock (hGlobal) ;
        
                                         lstrcpy (pGlobal, pText) ;
        
                                        GlobalUnlock (hGlobal) ;
        

                                         OpenClipboard (hwnd) ;
        
                                         EmptyClipboard () ;
        
                                         SetClipboardData (CF_TCHAR, hGlobal) ;
        
                                         CloseClipboard () ;
        

                                  if (   LOWORD (wParam) == IDM_EDIT_COPY)
        
                                                 return 0 ;      
        
                        // fall through for IDM_EDIT_CUT
        
                  case   IDM_EDIT_CLEAR:
        
                                         if (pText)
        
                                         {
        
                                                free (pText) ;
        
                                                 pText = NULL ;
        
                                         }
        
                                  InvalidateRect (hwnd, NULL, TRUE) ;
        
                                  return 0 ;
        

                  case   IDM_EDIT_RESET:
        
                                         if (pText)
        
                                         {
        
                                                 free (pText) ;
        
                                                 pText = NULL ;
        
                                         }
        
                          pText = malloc ((lstrlen (szDefaultText) + 1) * sizeof (TCHAR)) ;
        
                                         lstrcpy (pText, szDefaultText) ;
        
                                        InvalidateRect (hwnd, NULL, TRUE) ;
        
                                         return 0 ;
        
                  }
        
                  break ;
        

           case   WM_PAINT:
        
                  hdc = BeginPaint (hwnd, &ps) ;
        

                  GetClientRect (hwnd, &rect) ;
        
        
        
                  if (pText != NULL)
        
                  DrawText      (hdc, pText, -1, &rect, DT_EXPANDTABS | DT_WORDBREAK) ;
        

                  EndPaint (hwnd, &ps) ;
        
                  return 0 ;
        
        
        
           case   WM_DESTROY:
        
                  if (   pText)
        
                                         free (pText) ;
        

                                  PostQuitMessage (0) ;
        
                                 return 0 ;
        
           }
        
    return DefWindowProc (hwnd, message, wParam, lParam) ;
        
}
        
CLIPTEXT.RC （摘录）
        
//Microsoft Developer Studio generated resource script.
        
#include "resource.h"
        
#include "afxres.h"
        
/////////////////////////////////////////////////////////////////////////////
        
// Menu
        
CLIPTEXT MENU DISCARDABLE
        
BEGIN
        
    POPUP "&Edit"
        
   BEGIN
        
            MENUITEM "Cu&t\tCtrl+X",                     IDM_EDIT_CUT
        
       MENUITEM "&Copy\tCtrl+C",                 IDM_EDIT_COPY
        
       MENUITEM "&Paste\tCtrl+V",                IDM_EDIT_PASTE