MS-DOS批处理脚本:赋值操作

Question

我指的是以下威胁批处理文件：如何读取文件？。用于从文本文件中逐行检索。我正在使用以下脚本：

@echo off
SETLOCAL DisableDelayedExpansion
FOR /F "usebackq delims=" %%a in (`"findstr /n ^^ paths.txt"`) do (
    set "var=%%a"
    SETLOCAL EnableDelayedExpansion
    set "var=!var:*:=!"
    echo !var!
    ENDLOCAL
)

代码运行良好！!var!中的值不能分配给任何变量（我在那里构造，请任何人帮助逐行阅读，我希望分配给某个变量，并希望操作该变量。请帮助解决这种情况。

更新：

@ECHO off
CLS
SET PROJ_DIR=D:workspaceproj
SET PROMO_DIR=D:TEST
SET SOURCE_CODE=Source Code
SETLOCAL DisableDelayedExpansion
for /f %%a in (paths.txt) do (
    SET "var=%%a"
    SETLOCAL EnableDelayedExpansion
    set "var=!var:*:=!"
    set FILE_PATH=!var://www.domain.com/path/dir=!
    SET FILE_PATH=!FILE_PATH:/=!
    SET PROMO_FILE_PATH=!PROMO_DIR!!SOURCE_CODE!!FILE_PATH! 
    FOR %%i IN ("!PROMO_FILE_PATH!") DO SET FOLDER_PATH=%%~dpi
    FOR %%i IN ("!PROMO_FILE_PATH!") DO SET FILE_NAME=%%~nxi
    IF EXIST "!FOLDER_PATH!" GOTO F3
        MKDIR "!FOLDER_PATH!"
    :F3
    IF NOT EXIST "!PROJ_DIR!!FILE_PATH!" GOTO F4
        COPY "!PROJ_DIR!!FILE_PATH!" "!FOLDER_PATH!"
    :F4
        ECHO Cannot find the file under "!PROJ_DIR!!FILE_PATH!"
    ENDLOCAL
)
SET CLOSE_CONFIRM=
SET /P CLOSE_CONFIRM=Press any key to close the window...%=%

paths.txt

//www.domain.com/path/dir/dir1/dir2/file1.txt 
//www.domain.com/path/dir/dir1/dir2/file2.txt 
//www.domain.com/path/dir/dir1/dir2/file3.txt 
//www.domain.com/path/dir/dir1/dir2/file4.txt 
//www.domain.com/path/dir/dir1/dir3/file1.txt

命令输出

        1 file(s) copied.
Cannot find the file under "D:workspaceprojdir1dir2file1.txt"
        1 file(s) copied.
Cannot find the file under "D:workspaceprojdir1dir2file2.txt"
Press any key to close the window...

谢谢。。

Answer 1

关键是延迟展开，将括号内的变量始终用!展开，而不是用%展开。

用Y 改变X的样本

@echo off
SETLOCAL DisableDelayedExpansion
FOR /F "usebackq delims=" %%a in (`"findstr /n ^^ paths.txt"`) do (
    set "var=%%a"
    SETLOCAL EnableDelayedExpansion
    set "var=!var:*:=!"
    set "myVar=!var!"
    set "myVar=!myVar:X=Y!"
    echo X replaced with Y =!myVar! 
    ENDLOCAL
)

在您的更新版本中，goto:label立即停止for循环

最好重写为IF块

IF NOT EXIST "!FOLDER_PATH!" (
  MKDIR "!FOLDER_PATH!"
)
IF EXIST "!PROJ_DIR!!FILE_PATH!" (
    COPY "!PROJ_DIR!!FILE_PATH!" "!FOLDER_PATH!"
) ELSE
(
    ECHO Cannot find the file under "!PROJ_DIR!!FILE_PATH!"
)

Answer 2

这里的其他答案涵盖了此代码中延迟扩展的棘手部分。我想补充一点，通过将括号滚动到子例程中，您通常可以避免大多数延迟的扩展问题。

FOR /F "usebackq delims=" %%a in (`"findstr /n ^^ paths.txt"`) do call :HandlePath %%a
goto :eof
================
:HandlePath
set "var=%*"
set "var=%var:*:=%"
echo %var%
goto :eof

我发现这段代码更容易维护，因为每一行都是在您期望的时候解析和执行的。

Answer 3

如果您想读取每一行并对其进行操作：

SETLOCAL EnableDelayedExpansion
FOR /F "tokens=*" %%a IN (paths.txt) DO (
set var=%%a
ECHO %var%
PAUSE
)
ENDLOCAL

如果您试图从文件中搜索字符串并对其进行操作：

SETLOCAL EnableDelayedExpansion
FOR /F "tokens=* usebackq" %%a IN (`FIND /I 'string to search for' "C:folderpaths.txt"`) DO (
set var=%%a
ECHO %var%
PAUSE
)
ENDLOCAL

如果您试图搜索字符串并操作字符串中的每个单词：

SETLOCAL EnableDelayedExpansion
FOR /F "usebackq tokens=1-999 delims= " %%a IN (`FIND /I 'string to search for' "C:folderpaths.txt"`) DO (
REM %%a = first word  %%b = second word etc. through the alphabet
set var1=%%a%%b%%c
set var2=%%d
ser var3=%%e
ECHO %var1% %var2% %var3%
PAUSE
)
ENDLOCAL

Answer 4

这对我有效：

@echo off
SETLOCAL EnableDelayedExpansion
FOR /F "usebackq delims=" %%a in (`"findstr /n ^^ paths.txt"`) do (
set var=%%a
set var=!var:*:=!
echo !var!
)
ENDLOCAL