CWnd::OpenClipboard
Opens the Clipboard.
BOOL OpenClipboard( );
Return Value
Nonzero if the Clipboard is opened via CWnd, or 0 if another application or window has the Clipboard open.
Remarks
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.
Example
//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();
}
Requirements
Header: afxwin.h