MFC中将EDIT控件或CString文件复制到剪切板中

网上好多教程讲如何复制到剪切板，但是有可能复制的是乱码，为了方便，将CString类型的复制到剪切板

CString source;
if (OpenClipboard())
{
//防止非ASCII语言复制到剪切板为乱码
int buff_size = source.GetLength();
CStringW strWide = CStringW(source);
int nLen = strWide.GetLength();
//将剪切板置空
::EmptyClipboard();
HANDLE clipbuffer = ::GlobalAlloc(GMEM_DDESHARE,(nLen+1)*2);
if (!clipbuffer)
{
::CloseClipboard();
return;
}