安装前删除旧目录及文件

1.编写脚本

#include "ifx.h"

export prototype ExFn_CreateFile(HWND);

#define EXAMPLE_DIR  INSTALLDIR

#define EXAMPLE_FILES "deloldfiles.bat"

function ExFn_CreateFile(hMSI)

    string  szTitle, szMsg;

    number  nvFileHandle;

begin

    OpenFileMode (FILE_MODE_APPEND);   

    if (CreateFile (nvFileHandle, EXAMPLE_DIR, EXAMPLE_FILES) < 0) then

        MessageBox ("CreateFile failed.", SEVERE);

        abort;

    else

        //拼接命令并换行

        szMsg = "sc stop yiriworkstation\r\nsc delete yiriworkstation\r\n"+

                           "sc stop yirianalyzer\r\nsc delete yirianalyzer\r\n"+

                           "rmdir /s/q .\\SiteFiles\r\nrmdir /s/q .\\AnalystFiles\r\n"+

                           "rmdir /s/q .\\Workstation\r\nrmdir /s/q .\\Tools\r\nrmdir /s/q .\\Disptach\r\n";

        if (WriteLine(nvFileHandle, szMsg) < 0) then

            MessageBox ("WriteLine failed.", SEVERE);

        endif;

    endif;

     CloseFile (nvFileHandle);

     LaunchApp (INSTALLDIR+'\\deloldfiles.bat','');     

2.设置脚本执行顺序

见附件图片