C / C++ / MFC

void Ctest::OnCopyData()
{
::CoInitialize(NULL);
	COleDataSource* pSource = CopyTextList();
    if (!pSource)
        return;

	pSource->SetClipboard();

}

COleDataSource* Ctest::CopyTextFromList()
{
    USES_CONVERSION;

	CSharedFile sf(GMEM_MOVEABLE | GMEM_DDESHARE | GMEM_ZEROINIT);
	 CString str;
	int nPos=m_test.GetItemCount();
	for(int i=0;i<nPos;i++)
	{
		CString GetData=m_test.GetItemText(i,0);
		str+=GetData;
		str += _T("\r\n");
        sf.Write(T2A(str.GetBuffer(1)), str.GetLength());
        str.ReleaseBuffer();
	}
	
	 char c = '\0';
	 sf.Write(&c, 1);

	  DWORD dwLen = (DWORD) sf.GetLength();
    HGLOBAL hMem = sf.Detach();
    if (!hMem)
        return NULL;

    hMem = ::GlobalReAlloc(hMem, dwLen, GMEM_MOVEABLE | GMEM_DDESHARE | GMEM_ZEROINIT);
    if (!hMem)
        return NULL;

    // Cache data
    COleDataSource* pSource = new COleDataSource();
    pSource->CacheGlobalData(CF_TEXT, hMem);

    return pSource;
}