Writing a GUI delphi wrapper for dos utility application

Question

Im trying to create a GUI wrapper application for a dos utility. When I execute my dos utility application(dosapp.exe) in console look like this:

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WELCOME
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What do you want to do?
1- Type 1 ,For Enter System
2- Type 2 ,Set Properties
3- TYpe 3, Exit
Enter Action:

On my delphi xe3 application, I have three buttons one for each action and I run dosapp.exe using CreateProcess and Pipes to capture response.

My Problem is how to write the actions on console process for my 3 buttons pulsations, for example, when the user click on button1 I need send to running created process(dosapp.exe) writeline("1") and get response. I saw some examples for C# when this can by easy do it using process class and invoking Process.StandardInput.WriteLine("1")But i can't doit on delphi, Any idea or hint.

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edited: Finally Solved according David Heffman Comments.

Answer 1

Accepted answer as mentioned in comments:

Create a pipe. Make sure it's read end is inheritable. Call CreateProcess to start the other process. Pass the read end of the pipe as the new process stdin. Write onto the write end of the pipe. Do the same in reverse if you need to capture stdout.