从程序中往资源管理器中拖放文件（延时提供数据）

// ExplorerDelayDropDlg.cpp : implementation file // #include "stdafx.h" #include "ExplorerDelayDrop.h" #include "ExplorerDelayDropDlg.h" #ifdef _DEBUG #define new DEBUG_NEW #endif // CExplorerDelayDropDlg dialog CExplorerDelayDropDlg::CExplorerDelayDropDlg(CWnd* pParent /*=NULL*/) : CDialog(CExplorerDelayDropDlg::IDD, pParent) { m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); } void CExplorerDelayDropDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); DDX_Control(pDX, IDC_FILE_LIST, m_fileList); } BEGIN_MESSAGE_MAP(CExplorerDelayDropDlg, CDialog) ON_WM_PAINT() ON_WM_QUERYDRAGICON() //}}AFX_MSG_MAP ON_NOTIFY(LVN_BEGINDRAG, IDC_FILE_LIST, &CExplorerDelayDropDlg::OnBeginDrag) END_MESSAGE_MAP() // CExplorerDelayDropDlg message handlers BOOL CExplorerDelayDropDlg::OnInitDialog() { CDialog::OnInitDialog(); SetIcon(m_hIcon, TRUE); SetIcon(m_hIcon, FALSE); AfxOleInit(); m_fileList.SetExtendedStyle(LVS_EX_FULLROWSELECT); m_fileList.InsertColumn(0, _T("File"), LVCFMT_LEFT,75); m_fileList.InsertColumn(1, _T("Details"), LVCFMT_LEFT,175); for(TCHAR c = _T('A'); c < _T('F'); c++) { CString text1, text2; text1.Format(_T("%c.txt"),c); text2.Format(_T("File full of %cs"),c); m_fileList.SetItemText( m_fileList.InsertItem(c - _T('A'),text1),1,text2); } return TRUE; } // If you add a minimize button to your dialog, you will need the code below // to draw the icon. For MFC applications using the document/view model, // this is automatically done for you by the framework. void CExplorerDelayDropDlg::OnPaint() { if (IsIconic()) { CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0); // Center icon in client rectangle int cxIcon = GetSystemMetrics(SM_CXICON); int cyIcon = GetSystemMetrics(SM_CYICON); CRect rect; GetClientRect(&rect); int x = (rect.Width() - cxIcon + 1) / 2; int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon dc.DrawIcon(x, y, m_hIcon); } else { CDialog::OnPaint(); } } // The system calls this function to obtain the cursor to display while the user drags // the minimized window. HCURSOR CExplorerDelayDropDlg::OnQueryDragIcon() { return static_cast<HCURSOR>(m_hIcon); } void CExplorerDelayDropDlg::OnBeginDrag(NMHDR *pNMHDR, LRESULT *pResult) { UINT uFileCount = m_fileList.GetSelectedCount(); UINT uBuffSize = sizeof(FILEGROUPDESCRIPTOR) + (uFileCount-1) * sizeof(FILEDESCRIPTOR); HGLOBAL hFileDescriptor = GlobalAlloc ( GHND | GMEM_SHARE, uBuffSize ); if(hFileDescriptor) { FILEGROUPDESCRIPTOR* pGroupDescriptor = (FILEGROUPDESCRIPTOR*) GlobalLock ( hFileDescriptor ); if(pGroupDescriptor) { FILEDESCRIPTOR* pFileDescriptorArray = (FILEDESCRIPTOR*)((LPBYTE)pGroupDescriptor + sizeof(UINT)); pGroupDescriptor->cItems = uFileCount; POSITION pos = m_fileList.GetFirstSelectedItemPosition(); int index = 0; m_DataSrc.m_Files.RemoveAll(); while( NULL != pos ) { int nSelItem = m_fileList.GetNextSelectedItem( pos ); ZeroMemory(&pFileDescriptorArray[index], sizeof(FILEDESCRIPTOR)); lstrcpy ( pFileDescriptorArray[index].cFileName, m_fileList.GetItemText( nSelItem, 0 ) ); m_DataSrc.m_Files.Add(pFileDescriptorArray[index].cFileName); pFileDescriptorArray[index].dwFlags = FD_FILESIZE|FD_ATTRIBUTES; pFileDescriptorArray[index].nFileSizeLow = 512; pFileDescriptorArray[index].nFileSizeHigh = 0; pFileDescriptorArray[index].dwFileAttributes = FILE_ATTRIBUTE_NORMAL; index++; } } else { GlobalFree ( hFileDescriptor ); } } GlobalUnlock ( hFileDescriptor ); FORMATETC etcDescriptor = { RegisterClipboardFormat(CFSTR_FILEDESCRIPTOR), NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL }; m_DataSrc.CacheGlobalData ( RegisterClipboardFormat( CFSTR_FILEDESCRIPTOR), hFileDescriptor, &etcDescriptor ); FORMATETC etcContents = { RegisterClipboardFormat(CFSTR_FILECONTENTS), NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL }; m_DataSrc.DelayRenderFileData(RegisterClipboardFormat( CFSTR_FILECONTENTS), &etcContents); DROPEFFECT dwEffect = m_DataSrc.DoDragDrop ( DROPEFFECT_COPY | DROPEFFECT_MOVE ); if(dwEffect == DROPEFFECT_NONE ) { GlobalFree( hFileDescriptor ); } *pResult = 0; }