www.gusucode.com > VC++ 文件拖拽获得路径实例源码程序 > VC++ 文件拖拽获得路径实例源码程序/code/DropEdit.cpp
///////////////////////////////////////////////////////////////////////////// // // CDropEdit // Copyright 1997 Chris Losinger // Download by http://www.NewXing.com // This code is freely distributable and modifiable, as long as credit // is given to where it's due. Watch, I'll demonstrate : // // shortcut expansion code modified from : // CShortcut, 1996 Rob Warner // //// // // To use this in an app, you'll need to : // // 1) #include <afxole.h> in stdafx.h // // 2) in your CWinApp-derived class *::InitInstance, you'll need to call // ::CoInitialize(NULL); // // 3) in your CWinApp-derived class *::ExitInstance, you'll need to call // ::CoUninitialize(); // // 4) Place a normal edit control on your dialog. // 5) Check the "Accept Files" property. // // 6) In your dialog class, declare a member variable of type CDropEdit // (be sure to #include "CDropEdit.h") // ex. CDropEdit m_dropEdit; // // 7) In your dialog's OnInitDialog, call // m_dropEdit.SubclassDlgItem(IDC_YOUR_EDIT_ID, this); // // 8) if you want the edit control to handle directories, call // m_dropEdit.SetUseDir(TRUE); // // 9) if you want the edit control to handle files, call // m_dropEdit.SetUseDir(FALSE); // // that's it! // // This will behave exactly like a normal edit-control but with the // ability to accept drag-n-dropped files (or directories). // // #include "stdafx.h" #include "resource.h" #include "DropEdit.h" #include <sys/types.h> #include <sys/stat.h> #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CDropEdit CDropEdit::CDropEdit() { m_bUseDir=FALSE; } CDropEdit::~CDropEdit() { } BEGIN_MESSAGE_MAP(CDropEdit, CEdit) //{{AFX_MSG_MAP(CDropEdit) ON_WM_CREATE() ON_WM_DROPFILES() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CDropEdit message handlers int CDropEdit::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CEdit::OnCreate(lpCreateStruct) == -1) return -1; DragAcceptFiles(TRUE); return 0; } // // handle WM_DROPFILES // void CDropEdit::OnDropFiles(HDROP dropInfo) { // Get the number of pathnames that have been dropped WORD wNumFilesDropped = DragQueryFile(dropInfo, -1, NULL, 0); CString firstFile=""; // get all file names. but we'll only need the first one. for (WORD x = 0 ; x < wNumFilesDropped; x++) { // Get the number of bytes required by the file's full pathname WORD wPathnameSize = DragQueryFile(dropInfo, x, NULL, 0); // Allocate memory to contain full pathname & zero byte char * npszFile = (char *) LocalAlloc(LPTR, wPathnameSize += 1); // If not enough memory, skip this one if (npszFile == NULL) continue; // Copy the pathname into the buffer DragQueryFile(dropInfo, x, npszFile, wPathnameSize); // we only care about the first if (firstFile=="") firstFile=npszFile; // clean up LocalFree(npszFile); } // Free the memory block containing the dropped-file information DragFinish(dropInfo); // if this was a shortcut, we need to expand it to the target path CString expandedFile = ExpandShortcut(firstFile); // if that worked, we should have a real file name if (expandedFile!="") firstFile=expandedFile; struct _stat buf; // get some info about that file int result = _stat( firstFile, &buf ); if( result == 0 ) { // verify that we have a dir (if we want dirs) if ((buf.st_mode & _S_IFDIR) == _S_IFDIR) { if (m_bUseDir) SetWindowText(firstFile); // verify that we have a file (if we want files) } else if ((buf.st_mode & _S_IFREG) == _S_IFREG) { if (!m_bUseDir) SetWindowText(firstFile); } } } ////////////////////////////////////////////////////////////////// // use IShellLink to expand the shortcut // returns the expanded file, or "" on error // // original code was part of CShortcut // 1996 by Rob Warner // rhwarner@southeast.net // http://users.southeast.net/~rhwarner CString CDropEdit::ExpandShortcut(CString &inFile) { CString outFile = ""; // Make sure we have a path ASSERT(inFile != _T("")); IShellLink* psl; HRESULT hres; LPTSTR lpsz = inFile.GetBuffer(MAX_PATH); // Create instance for shell link hres = ::CoCreateInstance(CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER, IID_IShellLink, (LPVOID*) &psl); if (SUCCEEDED(hres)) { // Get a pointer to the persist file interface IPersistFile* ppf; hres = psl->QueryInterface(IID_IPersistFile, (LPVOID*) &ppf); if (SUCCEEDED(hres)) { // Make sure it's ANSI WORD wsz[MAX_PATH]; ::MultiByteToWideChar(CP_ACP, 0, lpsz, -1, wsz, MAX_PATH); // Load shortcut hres = ppf->Load(wsz, STGM_READ); if (SUCCEEDED(hres)) { WIN32_FIND_DATA wfd; // find the path from that HRESULT hres = psl->GetPath(outFile.GetBuffer(MAX_PATH), MAX_PATH, &wfd, SLGP_UNCPRIORITY); outFile.ReleaseBuffer(); } ppf->Release(); } psl->Release(); } inFile.ReleaseBuffer(); // if this fails, outFile == "" return outFile; }