从 C# 使用参数在 C++ 上运行 .exe

Question

I have one application on C++ and one on C# (for GUI).

I run exe - file (C++) from C# in new process and pass parameters to the command line.

Code C#:

System.Diagnostics.Process Proc = new System.Diagnostics.Process();
Proc.StartInfo.FileName = "main.exe";
Proc.StartInfo.Arguments = "p";
Proc.Start();

Code C++:

if (char(argv[1]) == 'p') 
     {
            program.SetUniform("cur_color", make_float3(0.5f, 0.5f, 0.0f));
            std::cout << "This is true" << std::endl;
     }
else {
            std::cout << "This is false    " << argv[1] << std::endl;
            program.SetUniform("cur_color", make_float3(0.9f, 0.9f, 0.9f));
     }

But I got "This is false p" as a result.

I don't know why. Can you help me? Could there be a problem with the type of argument being passed? Thanks!

Answer 1

You cant do comparing this way, because arguments in C++ are delivered as char** where argv[0] argv[1] etc. are arrays created from arguments separated by space.

Example:

main.exe foo bar

argv[0] == ['f','o','o']
argv[1] == ['b','a','r']

Documentation: HERE

So you need to iterate through the characters for comparison or make std::vector<std:string> from argv

Example:

C# Program Calling C++ Exe
  main.exe p foo bar
C++ Program Getting Parameters and comparing them
  argv[1][0] == 'p'

Simpler way to compare, but not faster in non complex solutions:

std::vector<std::string> vectorOfArguments(argv + 1, argv + argc);

Then you can just browse through vector

for(auto & argument : vectorOfArguments){
   //Some Action
}

Hope it helped