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CWnd::OpenClipboard

Opens the Clipboard.

BOOL OpenClipboard( );

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

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.

//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();
}

Header: afxwin.h

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