CWnd::OpenClipboard

Статья
10/16/2008

Opens the Clipboard.

BOOL OpenClipboard( );

Возвращаемое значение

Nonzero if the Clipboard is opened via CWnd, or 0 if another application or window has the Clipboard open.

Заметки

Other applications will not be able to modify the Clipboard until the CloseClipboard Windows function is called.

The current CWnd object will not become the owner of the Clipboard until the EmptyClipboard Windows function is called.

Пример

//handler for Edit | Copy menu
void CMdiView::OnEditCopy()
{
   if (!OpenClipboard())
   {
      AfxMessageBox(_T("Cannot open the Clipboard"));
      return;
   }
   // Remove the current Clipboard contents  
   if(!EmptyClipboard())
   {
      AfxMessageBox(_T("Cannot empty the Clipboard"));
      return;  
   }

   // Get the currently selected data, hData handle to 
   // global memory of data
   CString str;
   m_Edit.GetWindowText(str);
   size_t cbStr = (str.GetLength() + 1) * sizeof(TCHAR);
   HGLOBAL hData = GlobalAlloc(GMEM_MOVEABLE, cbStr);
   memcpy_s(GlobalLock(hData), cbStr, str.LockBuffer(), cbStr);
   GlobalUnlock(hData);
   str.UnlockBuffer();

   // For the appropriate data formats...
   UINT uiFormat = (sizeof(TCHAR) == sizeof(WCHAR)) ? CF_UNICODETEXT : CF_TEXT;
   if (::SetClipboardData(uiFormat, hData) == NULL)  
   {
      AfxMessageBox(_T("Unable to set Clipboard data"));    
      CloseClipboard();
      return;  
   }  

   CloseClipboard();
}