CMake Debug Settings with Visual Studio

bar.txt

Hello World!

CMakeLists.txt

cmake_minimum_required(VERSION 3.19)
project(foo)

add_executable(foo src/main.cpp)
set_target_properties(foo PROPERTIES
	VS_DEBUGGER_WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
	VS_DEBUGGER_COMMAND_ARGUMENTS "bar.txt")

launch.vs.json

{
  "version": "0.2.1",
  "defaults": {},
  "configurations": [
    {
      "type": "default",
      "project": "CMakeLists.txt",
      "projectTarget": "foo.exe",
      "name": "foo.exe [with args]",
      "currentDir": "${workspaceRoot}",
      "args": ["bar.txt"]
    }
  ]
}

main.cpp

#include <iostream>
#include <fstream>
#include <string>

int main(int argc, const char** argv)
{
	if (argc < 2)
	{
		std::cerr << "Insufficient arguments." << std::endl;
		return -1;
	}
	
	std::ifstream file(argv[1]);
	if (!file.is_open())
	{
		std::cerr << "Could not open file: " << argv[1] << "." << std::endl;
		return -1;
	}

	std::string line;
	while (std::getline(file, line))
	{
		std::cout << line << std::endl;
	}
}