我可以在DOS批处理文件中的IF块？ [英] Can I have an IF block in DOS batch file?

问题描述

在DOS批处理文件，我们只能有1行if语句的身体吗？我想我找到的地方，我可以用（）一个if块就像{}用于C-的 像编程语言，但它不执行语句时，我试试这个。没有错误消息无论是。这是我的code：

In a DOS batch file we can only have 1 line if statement body? I think I found somewhere that I could use () for an if block just like the {} used in C-like programming languages, but it is not executing the statements when I try this. No error message either. This my code:

if %GPMANAGER_FOUND%==true(echo GP Manager is up
goto Continue7
)
echo GP Manager is down
:Continue7

奇怪的既不是GP Manager启动，也不是GP管理器下当我运行该批处理文件被打印出来。

Strangely neither "GP Manager is up" nor "GP Manager is down" gets printed when I run the batch file.

推荐答案

您确实可以把创建语句后，有条件执行的块。但是你的语法错误。括号必须完全按照显示的：

You can indeed place create a block of statements to execute after a conditional. But you have the syntax wrong. The parentheses must be used exactly as shown:

if <statement> (
    do something
) else (
    do something else
)

不过，我不认为有对任何内置语法否则，如果语句。您将遗憾的是需要创建的嵌套块，如果语句来处理这个问题。

However, I do not believe that there is any built-in syntax for else-if statements. You will unfortunately need to create nested blocks of if statements to handle that.

结果
其次，％GPMANAGER_FOUND％==真测试看起来威猛可疑我。我不知道是什么环境变量设置为，或者您是如何设置它，但我很怀疑你已经显示的code会产生你正在寻找的结果。

Secondly, that %GPMANAGER_FOUND% == true test looks mighty suspicious to me. I don't know what the environment variable is set to or how you're setting it, but I very much doubt that the code you've shown will produce the result you're looking for.

结果
下面的示例code正常工作对我来说：

The following sample code works fine for me:

@echo off

if ERRORLEVEL == 0 (
    echo GP Manager is up
    goto Continue7
)
echo GP Manager is down
:Continue7

请注意我的样品code一些具体细节：

Please note a few specific details about my sample code:

• 条件语句结束之间添加的空间，而左括号。


• 我设置关闭@echo 从看到的所有的打印到控制台，因为他们执行语句的保持，而是只看到这些输出专门与开始回声。


• 我使用的是内置的 ERRORLEVEL 变量只是作为一个测试。在这里阅读更多

• The space added between the end of the conditional statement, and the opening parenthesis.
• I am setting @echo off to keep from seeing all of the statements printed to the console as they execute, and instead just see the output of those that specifically begin with echo.
• I'm using the built-in ERRORLEVEL variable just as a test. Read more here

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