执行批处理文件时，该命令的语法在中频条件下不正确

Question

在下面的代码中，我得到该命令的语法不正确的错误。最有可能在第一次IF声明。但有时它工作顺利。不知道为什么？请帮助

@ECHO OFF 
IF "%~1" == "" (
    ECHO Please provide file location 
    GOTO End 
) ELSE (
    echo %1 
    SET FILE=%1 
    IF NOT EXIST %FILE% (
     ECHO Invalid File. Please provide correct path of file. 
     GOTO End 
    ) 
    echo file found 
) 
:End 
echo End of script 

Answer 1

@ECHO OFF 
setlocal enableDelayedExpansion 
IF "%~1" == "" (
    ECHO Please provide file location 
    GOTO End 
) ELSE (
    echo %1 
    SET "FILE=%~1" 
    IF NOT EXIST "!FILE!" (
     ECHO Invalid File. Please provide correct path of file. 
     GOTO End 
    ) 
    echo file found 
) 
:End 
echo End of script 
endlocal 

为您设置brackets.The变量中的变量需要延迟扩展撑不定，直到支架和CMD解析器结束看到：

IF NOT EXIST (
      ECHO Invalid File. Please provide correct path of file. 
      GOTO End 
     ) 

这是一个语法错误检测在执行if之前。

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