得到桌面路径

    TCHAR lpszDesktopPath[MAX_PATH];
    if(::SHGetSpecialFolderPath(AfxGetMainWnd()-> m_hWnd,lpszDesktopPath,CSIDL_DESKTOP,NULL))
    {
        CString str(_T(""));
        str.Format(_T("%s"),lpszDesktopPath);
        AfxMessageBox(str);
    }
注意：TCHAR WCHAR  LPWSTR  wchar*  CString 转换
-------------------------------------------------------------------------------------------------------------------
        DWORD dwAttr=GetFileAttributesW(m_savepath);   //m_savepath路径，如：C:\\报表
        if(dwAttr==0xFFFFFFFF)    //若文件夹不存在，创建文件夹
            CreateDirectoryW(m_savepath,NULL);
        else
            if(dwAttr & FILE_ATTRIBUTE_DIRECTORY)   //若是文件夹 ，就处理
           {
              
           }
------------------------------------------------------------------------------------------------------------------------
声明API：
 function ulong SHGetSpecialFolderPath(long hwndOwner,ref string lpszPath,int nFolder,boolean fCreate )
LIBRARY "shell32.dll" ALIAS FOR "SHGetSpecialFolderPathA"

Function Long GetDesktopWindow() Library 'user32.dll'

hwndOwner ：用GetDesktopWindow API取一个窗口句柄。

lpszPath：返回的路径

nFolder：标识代号

fCreate：true ：如果文件夹不存在则创建，false：不创建

lpszPath和nFolder对应关系：

nFolder	lpszPath
0	C:/Documents and Settings/当前用户/桌面
2	C:/Documents and Settings/当前用户/「开始」菜单/程序
5	C:/Documents and Settings/当前用户/My Documents
6	C:/Documents and Settings/当前用户/Favorites
7	C:/Documents and Settings/当前用户/「开始」菜单/程序/启动
8	C:/Documents and Settings/当前用户/Recent
9	C:/Documents and Settings/当前用户/SendTo
11	C:/Documents and Settings/当前用户/「开始」菜单
13	C:/Documents and Settings/当前用户/My Documents/My Music
14	C:/Documents and Settings/当前用户/My Documents/My Videos
16	C:/Documents and Settings/当前用户/桌面
19	C:/Documents and Settings/当前用户/NetHood
20	C:/WINDOWS/Fonts
21	C:/Documents and Settings/当前用户/Templates
22	C:/Documents and Settings/All Users/「开始」菜单
23	C:/Documents and Settings/All Users/「开始」菜单/程序
24	C:/Documents and Settings/All Users/「开始」菜单/程序/启动
25	C:/Documents and Settings/All Users/桌面
26	C:/Documents and Settings/当前用户/Application Data
27	C:/Documents and Settings/当前用户/PrintHood
28	C:/Documents and Settings/当前用户/Local Settings/Application Data
31	C:/Documents and Settings/All Users/Favorites
32	C:/Documents and Settings/当前用户/Local Settings/Temporary Internet Files
33	C:/Documents and Settings/当前用户/Cookies
34	C:/Documents and Settings/当前用户/Local Settings/History
35	C:/Documents and Settings/All Users/Application Data
36	C:/WINDOWS
37	C:/WINDOWS/system32
38	C:/Program Files

39	C:/Documents and Settings/当前用户/My Documents/My Pictures
40	C:/Documents and Settings/当前用户
43	C:/Program Files/Common Files
45	C:/Documents and Settings/All Users/Templates
46	C:/Documents and Settings/All Users/Documents
47	C:/Documents and Settings/All Users/「开始」菜单/程序/管理工具
48	C:/Documents and Settings/当前用户/「开始」菜单/程序/管理工具
53	C:/Documents and Settings/All Users/Documents/My Music
54	C:/Documents and Settings/All Users/Documents/My Pictures
55	C:/Documents and Settings/All Users/Documents/My Videos
56	C:/WINDOWS/resources
59	C:/Documents and Settings/当前用户/Local Settings/Application Data/Microsoft/CD Burning