系统文件夹路径的系统宏定义及意义，使用SHGetFolderPath API获得路径示例

Const CSIDL_ADMINTOOLS As Long = &H30                '（用户）\开始菜单\程序\系统管理工具
Const CSIDL_ALTSTARTUP As Long = &H1D                '未本地化的启动
Const CSIDL_APPDATA As Long = &H1A                   '（用户）\应用程序的数据
Const CSIDL_BITBUCKET As Long = &HA                  '（桌面）\回收站
Const CSIDL_CONTROLS As Long = &H3                   '我的电脑\控制面板
Const CSIDL_COOKIES As Long = &H21
Const CSIDL_DESKTOP As Long = &H0                    '桌面
Const CSIDL_DESKTOPDIRECTORY As Long = &H10          '（用户）\桌面
Const CSIDL_FAVORITES As Long = &H6                  '（用户）\个性化设置
Const CSIDL_FONTS As Long = &H14                     'windows\字体
Const CSIDL_HISTORY As Long = &H22
Const CSIDL_INTERNET As Long = &H1                   'IE（桌面上的图标
Const CSIDL_INTERNET_CACHE As Long = &H20            '因特网缓存文件夹
Const CSIDL_LOCAL_APPDATA     As Long = &H1C            '（用户）\本地设置\应用程序数据
Const CSIDL_DRIVES As Long = &H11                    '我的电脑
Const CSIDL_MYPICTURES As Long = &H27                'C:\Program Files\My Pictures
Const CSIDL_NETHOOD As Long = &H13                   '（用户）\网上邻居中的元素
Const CSIDL_NETWORK As Long = &H12                   '网上邻居
Const CSIDL_PRINTERS As Long = &H4                   '我的电脑\打印机
Const CSIDL_PRINTHOOD As Long = &H1B                 '（用户）\打印机连接
Const CSIDL_PERSONAL As Long = &H5                   '我的文档
Const CSIDL_PROGRAM_FILES As Long = &H26             'C:\Program Files
Const CSIDL_PROGRAM_FILESX86 As Long = &H2A          'x86 apps (Alpha)的程序文件目录
Const CSIDL_PROGRAMS As Long = &H2                   '开始菜单\程序
Const CSIDL_PROGRAM_FILES_COMMON As Long = &H2B      'Program Files\Common
Const CSIDL_PROGRAM_FILES_COMMONX86 As Long = &H2C 'RISC上的x86 \Program Files\Common
Const CSIDL_RECENT As Long = &H8                     '(用户)\最近记录目录
Const CSIDL_SENDTO As Long = &H9                     '(用户)\发送到目录
Const CSIDL_STARTMENU As Long = &HB                  '(用户)\开始菜单
Const CSIDL_STARTUP As Long = &H7                    '开始菜单\程序\启动
Const CSIDL_SYSTEM As Long = &H25                    'system文件夹
Const CSIDL_SYSTEMX86 As Long = &H29                 'x86 apps (Alpha)的system文件夹
Const CSIDL_TEMPLATES As Long = &H15
Const CSIDL_PROFILE As Long = &H28                   '用户概貌文件夹
Const CSIDL_WINDOWS As Long = &H24                   'Windows目录或SYSROOT()
Const CSIDL_COMMON_ADMINTOOLS As Long = &H2F         '（所有用户）\开始菜单\程序\系统管理工具
Const CSIDL_COMMON_ALTSTARTUP As Long = &H1E         '未本地化的通用启动
Const CSIDL_COMMON_APPDATA As Long = &H23            '（所有用户）\应用程序数据
Const CSIDL_COMMON_DESKTOPDIRECTORY As Long = &H19 '（所有用户）\桌面
Const CSIDL_COMMON_DOCUMENTS As Long = &H2E          '（所有用户）\文档
Const CSIDL_COMMON_FAVORITES As Long = &H1F          '(所有用户)\设置
Const CSIDL_COMMON_PROGRAMS As Long = &H17           '(所有用户)\程序
Const CSIDL_COMMON_STARTMENU As Long = &H16          '(所有用户)\开始菜单
Const CSIDL_COMMON_STARTUP As Long = &H18            '(所有用户)\启动
Const CSIDL_COMMON_TEMPLATES As Long = &H2D          '(所有用户)\临时

'其他常量
Const CSIDL_FLAG_Create = &H8000&
Const CSIDL_FLAG_DONT_VERIFY = &H4000
Const CSIDL_FLAG_MASK = &HFF00
Const SHGFP_TYPE_CURRENT = &H0
Const SHGFP_TYPE_DEFAULT = &H1

'部分常量在XP下无效!!!

【C程序示例】

#include <shlobj.h>
#include <shlwapi.h>
#include <windows.h>
#include <stdio.h>

void main(void)
{
    char DataDir[MAX_PATH];
    int len;
    memset(DataDir, 0, sizeof(DataDir));
    if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_COMMON_APPDATA, NULL, 0, DataDir)))
        PathAppendA(DataDir, "XXXX\\XXXX.txt");
    else 
        return -1;
    len = strlen(DataDir);
    argv[5] = (char*) malloc(strlen(DataDir)); // argv[5] 为自己定义的的变量指针
    memset(argv[5], 0, strlen(DataDir));
    strcpy(argv[5], DataDir);

}