Retrieve Variable from Batch Task and Use It in launch.json in VS Code

Question

I have a batch file which sets a variable using the following:

set "MyVariable=Test"

I have configured a task in tasks.json to run this batch file:

{
    "version": "2.0.0",
    "tasks": [{
        "label": "VariableTest",
        "command": "${workspaceFolder}/.vscode/VariableTest.bat",
        "args": [],
        "type": "shell"
    }]
}

How can I retrieve the value of this variable from my launch.json file? "VariableTest" is setup as a preLaunchTask for the launch configurations, and parameters in this configuration depend on this variable.

I am of course running Windows (10).

Thanks!

You could create another batch file from your first batchfile and then execute that batch file in another dependant task using the "dependsOn": ["firstTask"] option — tHeSiD
– tHeSiD, Commented Jun 16, 2020 at 13:57

rioV8 · Accepted Answer · 2020-11-21 15:50:54Z

This variable is set in a separate shell.

You need to store the value in a file and use an extension to retrieve the content.

Use

echo SomeText > c:\temp\VariableResult.txt

to store the variable value in a file.

You can use Command Variable and the command extension.commandvariable.file.content

An example launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Python: Current File Args",
      "type": "python",
      "request": "launch",
      "program": "${file}",
      "console": "integratedTerminal",
      "args" : ["${input:variableResult}"],
      "preLaunchTask": "VariableTest"
    }
  ],
  "inputs": [
    {
      "id": "variableResult",
      "type": "command",
      "command": "extension.commandvariable.file.content",
      "args": {
        "fileName": "c:\\temp\\VariableResult.txt"
      }
    }
  ]
}

If the output file contains key-value pairs you can specify the key to use.

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