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2015三月24

DUI-获得文件拖动所在路径

DUI

随手代码:（以下针对duirichedit设置）内部调用：

GetContainer()->OnRegisterDragDrop(m_hDUIWnd,pDropTarget);

即可

View Code CPP
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class DropFileTarget : public IDropTarget
{
public:
	DropFileTarget();
	~DropFileTarget();
 
public:
	//IUnkown
	virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, __RPC__deref_out void __RPC_FAR *__RPC_FAR *ppvObject);
	virtual ULONG STDMETHODCALLTYPE AddRef(void);
	virtual ULONG STDMETHODCALLTYPE Release(void);
 
	//IDropTarget
	virtual HRESULT STDMETHODCALLTYPE DragEnter(__RPC__in_opt IDataObject *pDataObj,DWORD grfKeyState,POINTL pt,__RPC__inout DWORD *pdwEffect);
	virtual HRESULT STDMETHODCALLTYPE DragOver(DWORD grfKeyState,POINTL pt,__RPC__inout DWORD *pdwEffect);
	virtual HRESULT STDMETHODCALLTYPE DragLeave(void);
	virtual HRESULT STDMETHODCALLTYPE Drop(__RPC__in_opt IDataObject *pDataObj,DWORD grfKeyState, POINTL pt,__RPC__inout DWORD *pdwEffect);
protected:        
	LONG              m_nRef;
};
View Code CPP
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/// DropFileTarget
DropFileTarget::DropFileTarget()
{
	m_nRef = 1;
}
 
DropFileTarget::~DropFileTarget()
{
}
 
//IUnkown
HRESULT STDMETHODCALLTYPE DropFileTarget::QueryInterface(REFIID riid, __RPC__deref_out void __RPC_FAR *__RPC_FAR *ppvObject)
{
	HRESULT hr = S_OK;// E_NOINTERFACE;
	do 
	{
		if (__uuidof(IUnknown) == riid)
		{
			*ppvObject=(IUnknown*) this;
			AddRef();
			break;
		}
		if(__uuidof(IDropTarget) == riid)
		{
			*ppvObject=(IDropTarget*)this;
			AddRef();
			break;
		}
 
		hr = E_NOINTERFACE;
	} while (false);
	return hr;
}
ULONG STDMETHODCALLTYPE DropFileTarget::AddRef(void)
{
	return ++m_nRef;
}
 
ULONG STDMETHODCALLTYPE DropFileTarget::Release(void)
{ 
	ULONG uRet = --m_nRef;
	if (0 == uRet)
	{
		delete this;
	}
	return uRet;
}
 
/// IDropTarget
HRESULT STDMETHODCALLTYPE DropFileTarget::DragEnter(__RPC__in_opt IDataObject *pDataObj,DWORD grfKeyState,POINTL pt,__RPC__inout DWORD *pdwEffect)
{
	*pdwEffect = DROPEFFECT_COPY;
	return S_FALSE;
}
 
HRESULT STDMETHODCALLTYPE DropFileTarget::DragOver(DWORD grfKeyState,POINTL pt,__RPC__inout DWORD *pdwEffect)
{
	*pdwEffect = DROPEFFECT_COPY;
	return S_FALSE;
}
 
HRESULT STDMETHODCALLTYPE DropFileTarget::DragLeave(void)
{
	return S_FALSE;
}
HRESULT STDMETHODCALLTYPE DropFileTarget::Drop(__RPC__in_opt IDataObject *pDataObj,DWORD grfKeyState, POINTL pt,__RPC__inout DWORD *pdwEffect)
{
	HRESULT hr = S_FALSE;
	do 
	{
		// 
		FORMATETC formatEtc;
		formatEtc.cfFormat = CF_HDROP;
		formatEtc.ptd = NULL;
		formatEtc.dwAspect = DVASPECT_CONTENT;
		formatEtc.lindex = -1;
		formatEtc.tymed = (DWORD) -1;
		if (FAILED(pDataObj->QueryGetData(&formatEtc)))
		{
			break;
		}
 
		STGMEDIUM stgMedium;
		SCODE sc = pDataObj->GetData(&formatEtc, &stgMedium);
		if (FAILED(sc))
		{
			break;
		}
		HDROP hDropFiles = (HDROP)GlobalLock((HGLOBAL)stgMedium.hGlobal); //锁定内存块
		if (NULL != hDropFiles)
		{
			int nDropCount = DragQueryFile(hDropFiles, -1, NULL, 0);
			wchar_t szPath[MAX_PATH] = {0};
			for (int i=0;i<nDropCount; i++)
			{
				memset(szPath,0,sizeof(wchar_t)*MAX_PATH);
				DragQueryFileW(hDropFiles,i, (LPWSTR)szPath,MAX_PATH);
			}
		}
		GlobalUnlock(stgMedium.hGlobal);
		if (stgMedium.pUnkForRelease)
		{
			::ReleaseStgMedium(&stgMedium);
		}
	} while (false);
 
	return hr;
}

参考自MFC的COleDropSource::GetFileData 以下面的代码改装而来:

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BOOL CListCtrlEx::OnDrop(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint point)
{
       UINT           nFileCount = 0;
       HDROP          hDropFiles = NULL;
       HGLOBAL        hMemData = NULL;
 
       AfxMessageBox("OnDrop");
       if(pDataObject->IsDataAvailable(CF_HDROP))
       {
              hMemData = pDataObject->GetGlobalData(CF_HDROP);
              hDropFiles = (HDROP)GlobalLock((HGLOBAL)hMemData); //锁定内存块
              if(hDropFiles != NULL)
              {
                     char chTemp[_MAX_PATH+1] = {0};
                     nFileCount = DragQueryFile(hDropFiles, 0xFFFFFFFF, NULL, 0);
                     for(UINT nCur=0; nCur<nFileCount; ++nCur) //遍历取得每个文件名
                     {
                            ZeroMemory(chTemp, _MAX_PATH+1);
                            DragQueryFile(hDropFiles, nCur, (LPTSTR)chTemp, _MAX_PATH+1);
                            AddAllFiles(chTemp);
                     }
              }
              GlobalUnlock(hMemData);
              return TRUE;
       }
       else
       {
              return FALSE;
       }
}


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