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I'm using Visual Studio Code (VSCode) to work on a C++ project and I want to automate the process of compiling my C++ code and running it with input redirected from a file (input.txt) and the output saved to another file (output.txt).

I've set up a tasks.json file in VSCode to build the code and run the program, but when I try to execute the task, I encounter issues with input/output redirection. I need a solution that allows me to compile the code and handle input and output files properly.

I configured tasks.json to compile the C++ file with g++ and run the executable with input/output redirection. The task should compile hash.cpp, redirect input from input.txt, and save the output to output.txt

enter image description here

i go to the terminal -> configure tasks ->create tasks.json from template -> and then update the tasks.json file with below tasks.json

tasks.json

{
    "version": "2.0.0",
    "tasks": [
      {
        "label": "Compile and run",
        "type": "shell",
        "command": "",
        "args": [
          "copy",
          "\"${file}\"",
          "${workspaceFolder}\\jspwTest.cpp",
          "&&",
          "g++",
          "jspwTest.cpp",
          "-o",
          "jspwTest",
          "&&",
          "jspwTest",
          "<",
          "input.txt",
          ">",
          "output.txt",
          "&&",
          "del",
          "jspwTest.exe",
          "&&",
          "del",
          "jspwTest.cpp"
        ],
        "presentation": {
          "reveal": "never"
        },
        "group": {
          "kind": "build",
          "isDefault": true,
        },
        "problemMatcher": {
          "owner": "cpp",
          "fileLocation": [
            "relative",
            "${workspaceRoot}"
          ],
          "pattern": {
            "regexp": "^(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$",
            "file": 1,
            "line": 2,
            "column": 3,
            "severity": 4,
            "message": 5
          }
        }
      }
    ]
  }

I want when i click to run "ctrl + shift + b" it should read the input from input.txt and write the output in output.txt.
But it is giving me error and compilation i.e, .exe file is also not generating.

Improve this question
6
  • 2
    Maybe you want to do this in launch.json instead of in a build task: https://stackoverflow.com/questions/57889703/in-visual-studio-code-how-to-pass-arguments-in-launch-json https://stackoverflow.com/questions/38827877/passing-arguments-to-c-programme-for-debugging-in-vscode Commented Jan 8 at 16:02
  • 2
    Edit your question and include any errors directly as text. If you're getting a compilation error, include the full compilation line. Commented Jan 8 at 16:02
  • 1
    Welcome! Can you show us the output of this process? As far as I understand, you first copy your file to a specific name -- why is this needed? Doesn't your file already have the correct name? Finally, can you compile your code by hand, on a terminal? Commented Jan 8 at 16:03
  • 2
    It looks like you make args contain shell specifics like &&, < and >. I assume VSCode will either by-pass the shell interpretation OR escape these characters so that what is executed is only one command, copy, and the rest will be arguments to copy. Perhaps you should use command instead of args and then write the whole commandline as "command" : "copy ... && g++ ... && jspwTest < input.txt > output.txt && del jspwTest.exe" or similar. See tasks Commented Jan 8 at 16:42
  • 1
    All things related to running program should be done in the launch.json. There you can define run configurations and likely specify redirections of standard input and output. Commented Jan 8 at 18:12
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