www.pudn.com > ShellExtGuide6_demo.zip > SendToShlExt.cpp

// SendToShlExt.cpp : Implementation of CSendToShlExt 
#include "stdafx.h" 
#include "SendToClone.h" 
#include "SendToShlExt.h" 
#include "SendToCloneDlg.h" 
 
///////////////////////////////////////////////////////////////////////////// 
// CSendToShlExt 
 
HRESULT CSendToShlExt::DragEnter ( IDataObject* pDataObj, DWORD grfKeyState, 
                                   POINTL pt, DWORD* pdwEffect ) 
{ 
    AFX_MANAGE_STATE(AfxGetStaticModuleState());    // init MFC 
 
COleDataObject dataobj; 
TCHAR          szItem [MAX_PATH]; 
UINT           uNumFiles; 
HGLOBAL        hglobal; 
HDROP          hdrop; 
 
    dataobj.Attach ( pDataObj, FALSE ); // attach to the IDataObject, don't auto-release it 
 
    // Read the list of items from the data object.  They're stored in HDROP 
    // form, so just get the HDROP handle and then use the drag 'n' drop APIs 
    // on it. 
 
    hglobal = dataobj.GetGlobalData ( CF_HDROP ); 
 
    if ( NULL != hglobal ) 
        { 
        hdrop = (HDROP) GlobalLock ( hglobal ); 
 
        uNumFiles = DragQueryFile ( hdrop, 0xFFFFFFFF, NULL, 0 ); 
 
        for ( UINT uFile = 0; uFile < uNumFiles; uFile++ ) 
            { 
            if ( 0 != DragQueryFile ( hdrop, uFile, szItem, MAX_PATH )) 
                { 
                m_lsDroppedFiles.AddTail ( szItem ); 
                } 
            } 
 
        GlobalUnlock ( hglobal ); 
        } 
 
    if ( m_lsDroppedFiles.GetCount() > 0 )  
        { 
        *pdwEffect = DROPEFFECT_COPY; 
        return S_OK; 
        } 
    else 
        { 
        *pdwEffect = DROPEFFECT_NONE; 
        return E_INVALIDARG; 
        } 
} 
 
HRESULT CSendToShlExt::Drop ( IDataObject* pDataObj, DWORD grfKeyState, 
                              POINTL pt, DWORD* pdwEffect ) 
{ 
    AFX_MANAGE_STATE(AfxGetStaticModuleState());    // init MFC 
 
CSendToCloneDlg dlg ( &m_lsDroppedFiles ); 
 
    dlg.DoModal(); 
 
    *pdwEffect = DROPEFFECT_COPY; 
    return S_OK; 
}