批处理重命名脚本问题：无法为目标文件添加对应后缀

问题原因 #

你的脚本核心问题是延迟变量扩展的嵌套使用错误：在遍历目标文件的循环中，set "suffix=!suffixes[%index%]!"这一行里，%index%使用的是批处理的普通变量扩展（百分号包裹），这种扩展会在整个for循环块被解析时一次性替换成变量的初始值（也就是0），不会在每次循环迭代时更新。所以不管循环中index怎么自增，始终只会取到数组的第一个元素，导致所有目标文件都被加上同一个后缀。

修复方案 #

只需要修改读取数组元素的代码，把普通变量扩展改成双层延迟扩展，让index的值能在每次迭代时实时解析：

修正后的完整脚本 #

@echo off
setlocal enabledelayedexpansion

REM Set directories
set "SOURCE_DIR=C:\Users\user\Downloads\105Images\105Images"
set "TARGET_DIR=C:\Users\user\Downloads\105_Images\105_Images"

REM File extensions
set "SRC_EXT=jpg"
set "TGT_EXT=csv"

REM Temporary storage for suffixes
set "TEMP_FILE=%TEMP%\suffixes.txt"
if exist "%TEMP_FILE%" del "%TEMP_FILE%"

echo Extracting suffixes from SOURCE_DIR...

REM Step 1: Extract last 5 characters from SOURCE_DIR filenames and save to a temp file
set "index=0"
for /f "delims=" %%f in ('dir /b /on "%SOURCE_DIR%\*.%SRC_EXT%"') do (
    set "filename=%%~nf"
    set "suffix=!filename:~-5!" 
    echo !suffix!>>"%TEMP_FILE%"
    echo [!index!] Stored suffix: !suffix! from file: %%f
    set /a index+=1
)

REM Read suffixes into memory properly
set "index=0"
for /f "tokens=*" %%s in (%TEMP_FILE%) do (
    set "suffixes[!index!]=%%s"
    echo Loaded suffix [!index!]: !suffixes[!index!]!
    set /a index+=1
)

REM Clean up temp file
del "%TEMP_FILE%"

REM Reset index
set "index=0"

echo Renaming files in TARGET_DIR...

REM Step 2: Loop through TARGET_DIR and rename files correctly
for /f "delims=" %%g in ('dir /b /on "%TARGET_DIR%\*.%TGT_EXT%"') do (
    set "target_filename=%%~ng"

    REM 关键修改：使用双层延迟扩展读取数组元素
    set "suffix=!suffixes[!index!]!"

    REM If suffix is found, rename the file
    if defined suffix (
        REM Construct new filename
        set "newname=!target_filename:~0,-4!!suffix!.%TGT_EXT%"

        REM Ensure unique file before renaming
        if exist "%TARGET_DIR%\!newname!" (
            echo ERROR: Duplicate file exists: "!newname!". Skipping...
        ) else (
            echo Renaming "%TARGET_DIR%\%%g" to "!newname!"
            ren "%TARGET_DIR%\%%g" "!newname!"
        )
    ) else (
        echo ERROR: No suffix found for "%TARGET_DIR%\%%g" (Index: !index!)
    )

    set /a index+=1
)

echo Done! Renamed all files in %TARGET_DIR%.
pause
exit /b %ERRORLEVEL%

额外优化（可选） #

你可以去掉临时文件的步骤，直接将源文件的后缀存入数组，避免磁盘IO操作：

@echo off
setlocal enabledelayedexpansion

set "SOURCE_DIR=C:\Users\user\Downloads\105Images\105Images"
set "TARGET_DIR=C:\Users\user\Downloads\105_Images\105_Images"
set "SRC_EXT=jpg"
set "TGT_EXT=csv"

set "index=0"
REM 直接读取源文件后缀存入数组，无需临时文件
for /f "delims=" %%f in ('dir /b /on "%SOURCE_DIR%\*.%SRC_EXT%"') do (
    set "filename=%%~nf"
    set "suffixes[!index!]=!filename:~-5!"
    echo [!index!] Stored suffix: !suffixes[!index!]! from file: %%f
    set /a index+=1
)

set "index=0"
echo Renaming files in TARGET_DIR...
for /f "delims=" %%g in ('dir /b /on "%TARGET_DIR%\*.%TGT_EXT%"') do (
    set "target_filename=%%~ng"
    set "suffix=!suffixes[!index!]!"

    if defined suffix (
        set "newname=!target_filename:~0,-4!!suffix!.%TGT_EXT%"
        if exist "%TARGET_DIR%\!newname!" (
            echo ERROR: Duplicate file exists: "!newname!". Skipping...
        ) else (
            echo Renaming "%TARGET_DIR%\%%g" to "!newname!"
            ren "%TARGET_DIR%\%%g" "!newname!"
        )
    ) else (
        echo ERROR: No suffix found for "%TARGET_DIR%\%%g" (Index: !index!)
    )
    set /a index+=1
)

echo Done!
pause
exit /b %ERRORLEVEL%

内容的提问来源于stack exchange，提问作者titus loftin