windows 批处理文件中的字符串比较
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string comparison in batch file
提问by dushyantp
How do we compare strings which got space and special chars in batch file?
我们如何比较批处理文件中有空格和特殊字符的字符串？
I am trying:
我在尝试：
if %DevEnvDir% == "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\"(
echo VS2010
)
But it gives an error "Files was unexpected at this time."
但是它给出了一个错误“此时文件是意外的”。
I tried:
我试过：
if "%DevEnvDir%" == "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\"(
echo VS2010
)
But it gives an error "The syntax of the command is incorrect."
但它给出了一个错误“命令的语法不正确。”
Any ideas?
有任何想法吗？
回答by AjV Jsy
Just put quotes around the Environment variable (as you have done) :if "%DevEnvDir%" == "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\"
but it's the way you put opening bracket without a space that is confusing it.
只需在 Environment 变量周围加上引号（正如您所做的那样）：if "%DevEnvDir%" == "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\"
但这是您放置左括号而没有空格的方式会使它混淆。
Works for me...
对我有用...
C:\if "%gtk_basepath%" == "C:\Program Files\GtkSharp.12\" (echo yes)
yes
回答by skataben
While @ajv-jsy's answer works most of the time, I had the same problem as @MarioVilas. If one of the strings to be compared contains a double quote ("), the variable expansion throws an error.
虽然@ajv-jsy 的答案大部分时间都有效，但我遇到了与@MarioVilas 相同的问题。如果要比较的字符串之一包含双引号 (")，则变量扩展会引发错误。
Example:
例子：
@echo off
SetLocal
set Lhs="
set Rhs="
if "%Lhs%" == "%Rhs%" echo Equal
Error:
错误：
echo was unexpected at this time.
Solution:
解决方案：
Enable delayed expansion and use ! instead of %.
启用延迟扩展并使用！代替 ％。
@echo off
SetLocal EnableDelayedExpansion
set Lhs="
set Rhs="
if !Lhs! == !Rhs! echo Equal
:: Surrounding with double quotes also works but appears (is?) unnecessary.
if "!Lhs!" == "!Rhs!" echo Equal
I have not been able to break it so far using this technique. It works with empty strings and all the symbols I threw at it.
到目前为止，我还无法使用这种技术打破它。它适用于空字符串和我扔给它的所有符号。
Test:
测试：
@echo off
SetLocal EnableDelayedExpansion
:: Test empty string
set Lhs=
set Rhs=
echo Lhs: !Lhs! & echo Rhs: !Rhs!
if !Lhs! == !Rhs! (echo Equal) else (echo Not Equal)
echo.
:: Test symbols
set Lhs= \ / : * ? " ' < > | %% ^^ ` ~ @ # $ [ ] & ( ) + - _ =
set Rhs= \ / : * ? " ' < > | %% ^^ ` ~ @ # $ [ ] & ( ) + - _ =
echo Lhs: !Lhs! & echo Rhs: !Rhs!
if !Lhs! == !Rhs! (echo Equal) else (echo Not Equal)
echo.
回答by Bernardo Ravazzoni
The solution is DO NOT USE SPACES!
解决方案是不要使用空格！
IF "%DevEnvDir%"=="C:\" (
