使用拖放的简单方法

如果要为窗口增加接受Drag&Drop的功能，请按照以下步骤：

1、在OnCreate(...)中调用AcceptDrag(TRUE)。

2、增加消息映射

BEGIN_MESSAGE_MAP(……)
    //{{AFX_MSG_MAP(CDropEdit)
    ON_WM_CREATE()
    ON_WM_DROPFILES() // 关于Drag&Drop的消息
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

3、处理消息

void CXXXXX::OnDropFiles(HDROP dropInfo)
{
    // 得到Drag&Drop的文件个数
    WORD wNumFilesDropped = DragQueryFile(dropInfo, -1, NULL, 0);

    CString firstFile="";

    //
    for (WORD x = 0 ; x < wNumFilesDropped; x++) {

        // 得到PathName的长度,由于第三个参数为NULL，所以调用会失败并返回所需长度
        WORD wPathnameSize = DragQueryFile(dropInfo, x, NULL, 0);

        // 分配memory
        char * npszFile = (char *) LocalAlloc(LPTR, wPathnameSize += 1);

        // 分配错
        if (npszFile == NULL) continue;

        // 再次得到文件名
        DragQueryFile(dropInfo, x, npszFile, wPathnameSize);

        firstFile=npszFile;

             // 如果是shortCut则进行转换得到正确的文件名,expandedFile为最后的文件名
             CString expandedFile = ExpandShortcut(firstFile);

        // 释放memory
        LocalFree(npszFile);
    }

    //完成
    DragFinish(dropInfo);

}

4、关于ExpandShortcut(...)

CString CXXXXX::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;
}

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摘自玉海园