C#•2y ago

✅ How read text output from already started process?

I need to read data from my chess engine and below is my code

var proc = new Process
            {
                StartInfo = new ProcessStartInfo
                {
                    FileName = "stockfish-windows-2022-x86-64-avx2.exe",
                    UseShellExecute = false,
                    RedirectStandardOutput = true,
                }
            };
            while(true) //i know thats bad
            {
                StreamReader reader = proc.StandardOutput;
                string line = reader.ReadLine();
                Debug.WriteLine(line);
            }

var proc = new Process
            {
                StartInfo = new ProcessStartInfo
                {
                    FileName = "stockfish-windows-2022-x86-64-avx2.exe",
                    UseShellExecute = false,
                    RedirectStandardOutput = true,
                }
            };
            while(true) //i know thats bad
            {
                StreamReader reader = proc.StandardOutput;
                string line = reader.ReadLine();
                Debug.WriteLine(line);
            }

But after starting that, I am getting

System.InvalidOperationException: "StandardOut has not been redirected or the process hasn't started yet."

System.InvalidOperationException: "StandardOut has not been redirected or the process hasn't started yet."

How I can fix that? Please...

8 Replies

Buddy•2y ago

You are literally not starting the process

ha0-samaOP•2y ago

It is already started i need just to read data

Buddy•2y ago

where ? There is no Start method being called

ha0-samaOP•2y ago

by user is it possible?

Buddy•2y ago

You cannot read by a process that is already started it must be started by C# itself

ha0-samaOP•2y ago

oh, okay

Buddy•2y ago

Or you can use injection techniques that use IPC to communicate with your program. (Which is not recommended for most cases)

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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✅ How read text output from already started process?