Win32 文件拖拽

1.响应系统消息  WM_DROPFILES

2.在响应函数里面获取拖拽文件路径

LRESULT OnDropFiles(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    HDROP hDropInfo = (HDROP)wParam;

    TCHAR filePath[80*MAX_PATH] = {0};

    int nFileCount;

    nFileCount = ::DragQueryFile(hDropInfo , 0xFFFFFFFF, NULL, 0);//获取文件个数

    //获取拖拽的文件的路径
    for (int i = 0 ;i < nFileCount ; i++)
    {
         ::DragQueryFile(hDropInfo , i , (LPTSTR)filePath ,1024);

         std::vector<wstring> vctString(1, filePath);

         wstring wstrFile = filePath;

         m_attString.push_back(wstrFile);//文件路径保存下来,CreateMail时使用

         AddFiles(vctString);
    }
    
    ::DragFinish   (hDropInfo);

    return 0;
}