eclipse eclipse中预定义的变量是什么？
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What are the predefined variables in eclipse?
提问by merours
With eclipse, I know how to use variables in my launch configurations. I also know there exist a set of predefined variables such as ECLIPSE_HOMEor WORKSPACE_LOC.
使用 eclipse，我知道如何在启动配置中使用变量。我也知道存在一组预定义的变量，例如ECLIPSE_HOME或WORKSPACE_LOC。
What I don't know is the extensive list of these predefined variables (ie : variables names and values). Is there such a resource ?
我不知道的是这些预定义变量的广泛列表（即：变量名称和值）。有这样的资源吗？
回答by Wei
I found a very good example about path variables in eclipse help documentation: workbench user guide-concepts-ant & external tools
我在eclipse帮助文档中找到了一个关于路径变量的很好的例子：workbench user guide-concepts-ant & external tools
Lets assume your Eclipse workspace directory is c:\eclipse\workspace and you have two projects, MyProject1 and MyProject2. The first project, MyProject1, is located inside the workspace directory, the second project, MyProject2, is located outside the workspace directory at c:\projects\MyProject2. Lets look at how the variable examples below will be expanded when an external tool is run, if the resource /MyProject2/MyFolder/MyFile.txt is selected.
让我们假设您的 Eclipse 工作区目录是 c:\eclipse\workspace，并且您有两个项目，MyProject1 和 MyProject2。第一个项目 MyProject1 位于工作区目录内，第二个项目 MyProject2 位于工作区目录之外的 c:\projects\MyProject2。如果选择了资源 /MyProject2/MyFolder/MyFile.txt，让我们看看在运行外部工具时如何扩展下面的变量示例。
Variable Example
变量示例
Expanded Results
扩展结果
<p>
${workspace_loc}c:\eclipse\workspace
${workspace_loc:/MyProject1/MyFile.txt}c:\eclipse\workspace\MyProject\MyFile.txt
${workspace_loc:/MyProject2/MyFile.txt} c:\projects\MyProject2\MyFile.txt
${project_loc} c:\projects\MyProject2
${project_loc:/MyProject1/MyFile.txt} c:\eclipse\workspace\MyProject
${container_loc} c:\projects\MyProject2\MyFolder
${resource_loc} c:\projects\MyProject2\MyFile.txt
${project_path} /MyProject2
${container_path} /MyProject2/MyFolder
${resource_path} /MyProject2/MyFolder/MyFile.txt
${project_name} MyProject2
${container_name} MyFolder
${resource_name} MyFile.txt
${build_type} none
</p>
回答by Aaron Digulla
Open the preferences and search for "Classpath Variables".
打开首选项并搜索“类路径变量”。
回答by greg-449
If you mean variables specified in things like the 'Location' field in the launch configuration then clicking the 'Variables...' button next to the field shows you a complete list of the currently defined variables.
如果您指的是在启动配置中的“位置”字段中指定的变量，则单击该字段旁边的“变量...”按钮会显示当前定义变量的完整列表。
Since plugins can add new variables to this list it isn't really possible to give a definitive list as it depends on which plugins you have installed.
由于插件可以向此列表中添加新变量，因此无法给出明确的列表，因为这取决于您安装了哪些插件。
回答by Daniel
${workspace_loc}
${workspace_loc}
and
和
${ProjDirPath}
${ProjDirPath}
worked for me in Eclipse Oxygen.
在 Eclipse Oxygen 对我来说有效。
