OpenClipboard用在什么场合？

[public]

用COleDataSource,COleDataObject 实现拷贝，粘贴。

[laolaoliu2002]

The COleDataSource class acts as a cache into which an application places the data that it will offer during data transfer operations, such as Clipboard or drag-and-drop operations.

You can create OLE data sources directly. Alternately, the COleClientItem and COleServerItem classes create OLE data sources in response to their CopyToClipboard and DoDragDrop member functions.

[public]

void CP003View::OnEditCopy()
{
// TODO: Add your command handler code here
//if(OpenClipboard())
//{
//EmptyClipboard();
COleDataSource * pSource = saveText();
if(pSource)
{
pSource->SetClipboard();
}

//CloseClipboard();
//}

}

[laolaoliu2002]

Whenever you want to prepare data for a transfer, you should create an object of this class and fill it with your data using the most appropriate method for your data. The way it is inserted into a data source is directly affected by whether the data is supplied immediately (immediate rendering) or on demand (delayed rendering).

[public]

void CP003View::OnEditPaste()
{
// TODO: Add your command handler code here
if(OpenClipboard())
{
COleDataObject dataObject;
VERIFY(dataObject.AttachClipboard());
DoPasteText(&dataObject);
Invalidate();
CloseClipboard();

/*
if (::IsClipboardFormatAvailable(CF_TEXT)
|| ::IsClipboardFormatAvailable(CF_OEMTEXT))
{
HANDLE hText= GetClipboardData(CF_TEXT);

char *pchData = (char*)GlobalLock(hText);

GetDocument()->m_str = pchData;


// Unlock the global memory.
GlobalUnlock(hText);
}
else
{
TRACE("CF_TEXT IS UNAVAILABAL\n");
}
*/
}


}

[public]

等等。，我问题太长，还没贴完呢。

[public]

COleDataSource* CP003View::saveText()
{
CP003Doc * pDoc = GetDocument();
TRACE("m_strText=%s\n",pDoc->m_strText);
if(!pDoc->m_strText.IsEmpty())
{
COleDataSource * pSource = new COleDataSource();
int nTextSize= GetDocument()->m_strText.GetLength() +1;
HGLOBAL hText = ::GlobalAlloc(GMEM_SHARE,nTextSize);
char* pText = (char*) ::GlobalLock(hText);
ASSERT(pText);
strcpy(pText,(LPCTSTR)GetDocument()->m_strText);
::GlobalUnlock(hText);
pSource->CacheGlobalData(CF_TEXT,hText);
return pSource;
}
else
{
TRACE("m_strText is empty!!");
return NULL;
}

}