執行批處理文件時，該命令的語法在中頻條件下不正確

Question

在下面的代碼中，我得到該命令的語法不正確的錯誤。最有可能在第一次IF聲明。但有時它工作順利。不知道爲什麼？請幫助

@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 

爲您設置brackets.The變量中的變量需要延遲擴展撐不定，直到支架和CMD解析器結束看到：

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

這是一個語法錯誤檢測在執行if之前。

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