How to get file path VS project on Ubuntu?

Question

I have a C project. I am working in VisualStudio on Ubuntu.

I need to read from a file.

I have this method:

        fp = fopen("path_to_file", "r");
        if (fp == NULL)
        {
            printf("\nERROR : file open failed\n");
            return 0;
        }
        while (fgets(buffer, MAX_NAME_LENGTH, (FILE *)fp))
        {
            printf("%s\n", buffer);
        }
        fclose(fp);
        if (line)
            free(line);

My file is located at the root of my project, so my question is - is there a way set way to file like this ${project_root}/my_tmp.txt ?

This way ${project_root} will be like a general value.

Answer 1

One possible solution would be to utilize the Tasks feature of VSCode and pass the project root path to your compiler as a preprocessor macro using the -D option, after which you could use it in your sourcecode.

An example (refer here for the complete documentation regarding Tasks) tasks.json file could look like this. Note the -D argument in the args array.

{
  "version": "2.0.0",
  "tasks": [
    {
      "type": "shell",
      "label": "default build option",
      "command": "/usr/bin/cc",
      "args": ["-g", "${file}", "-o", "${fileDirname}/${fileBasenameNoExtension}", "-DPROJECT_ROOT=\"${project_root}\""],
      "problemMatcher": ["$gcc"],
      "group": {
        "kind": "build",
        "isDefault": true
      }
    }
  ]
}

Then, in your C source, you could utilize the PROJECT_ROOT macro to construct the filename to open:

fp = fopen(PROJECT_ROOT "/path_to_file", "r");