由C++转成C#

wenrenhua08 2009-08-18 03:02:46

内容如下：
#include <afxole.h>

class COleListDropTarget : public COleDropTarget
{
public:
void SetParent(CWnd* pParent);
COleListDropTarget(CWnd* pParent = NULL);
virtual ~COleListDropTarget();

DROPEFFECT OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject, DWORD
dwKeyState, CPoint point );
DROPEFFECT OnDragOver(CWnd* pWnd, COleDataObject* pDataObject, DWORD
dwKeyState, CPoint point );
void OnDragLeave(CWnd* pWnd);

BOOL OnDrop(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT
dropEffect, CPoint point );

// Attributes
protected:
CWnd* m_pParent;

};

COleListDropTarget::COleListDropTarget(CWnd* pParent)
{
m_pParent = pParent;
}

COleListDropTarget::~COleListDropTarget()
{

}

//
// OnDragEnter is called by OLE dll's when drag cursor enters
// a window that is REGISTERed with the OLE dll's
//
DROPEFFECT COleListDropTarget::OnDragEnter(CWnd* pWnd, COleDataObject*
pDataObject, DWORD dwKeyState, CPoint point )
{
if (!pDataObject->IsDataAvailable(CF_TEXT))
{
return DROPEFFECT_NONE;

}

// if the control key is held down, return a drop effect COPY
if((dwKeyState&MK_CONTROL) == MK_CONTROL)
return DROPEFFECT_COPY;
// Otherwise return a drop effect of MOVE
else
return DROPEFFECT_MOVE;
}

//
// OnDragLeave is called by OLE dll's when drag cursor leaves
// a window that is REGISTERed with the OLE dll's
//
void COleListDropTarget::OnDragLeave(CWnd* pWnd)
{
// Call base class implementation
COleDropTarget::OnDragLeave(pWnd);
}

//
// OnDragOver is called by OLE dll's when cursor is dragged over
// a window that is REGISTERed with the OLE dll's
//
DROPEFFECT COleListDropTarget::OnDragOver(CWnd* pWnd, COleDataObject*
pDataObject, DWORD dwKeyState, CPoint point )
{
if (!pDataObject->IsDataAvailable(CF_TEXT))
return DROPEFFECT_NONE;

if((dwKeyState&MK_CONTROL) == MK_CONTROL)
return DROPEFFECT_NONE;
else
return DROPEFFECT_MOVE; // move source
}

BOOL COleListDropTarget::OnDrop(CWnd* pWnd, COleDataObject* pDataObject,
DROPEFFECT dropEffect, CPoint point )
{
HGLOBAL hGlobal;
LPCSTR pData;

if (pDataObject->IsDataAvailable(CF_TEXT))
{
STGMEDIUM Stg;
BOOL bValue = pDataObject->GetData(CF_TEXT, &Stg);

TCHAR *strText = (TCHAR*)GlobalLock(Stg.hGlobal);

CString strUrl;
strUrl.Format("%s",strText);

((CGetList *)m_pParent)->AddUrl(strUrl);

GlobalUnlock(Stg.hGlobal);
GlobalFree(Stg.hGlobal);

}

if((dropEffect&DROPEFFECT_MOVE) != DROPEFFECT_MOVE)
return FALSE;

// Get text data from COleDataObject
hGlobal=pDataObject->GetGlobalData(CF_TEXT);

// Get pointer to data
pData=(LPCSTR)GlobalLock(hGlobal);
ASSERT(pData!=NULL);

// Unlock memory - Send dropped text into the "bit-bucket"
GlobalUnlock(hGlobal);

return TRUE;
}

void COleListDropTarget::SetParent(CWnd *pParent)
{
m_pParent = pParent;
}

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