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.NET: Create Process

Create a new process in .NET with a simple Process.Start("notepad.exe") but more control is had by creating a Process object. Process.Start("http://www.bing.com") also works. Probably, Process.Start() is using the WinAPI ShellExecute() function while the Process object is using the CreateProcess() function (at least for the Windows platform).

Learn how to kill a process or download a file from a URL using HttpClient.

VB.NET:

Imports System.Diagnostics

Module Module1

	Sub Main()

		Dim pro As New Process()

		pro.StartInfo.FileName = "notepad.exe"
		pro.StartInfo.Arguments = "temp.txt"

		'can specify ProcessWindowStyle.Hidden for programs that do not need user input
		pro.StartInfo.WindowStyle = ProcessWindowStyle.Normal

		pro.Start()
		pro.WaitForExit()

	End Sub

End Module

C#:

using System.Diagnostics;

namespace Console1
{
	class Program
	{
		static void Main(string[] args)
		{
			Process pro = new Process();

			pro.StartInfo.FileName = "notepad.exe";
			pro.StartInfo.Arguments = "temp.txt";

			//can specify ProcessWindowStyle.Hidden for programs that do not need user input
			pro.StartInfo.WindowStyle = ProcessWindowStyle.Normal;

			pro.Start();
			pro.WaitForExit();
		}
	}
}

Create a console process and read its output.

using (var proc = new System.Diagnostics.Process
{
	StartInfo = new System.Diagnostics.ProcessStartInfo
	{
		FileName = "/bin/executable",
		Arguments = "-arguments",
		UseShellExecute = false,
		RedirectStandardOutput = true,
		CreateNoWindow = true
	}
})
{
	proc.Start();
	while (!proc.StandardOutput.EndOfStream)
	{
		string line = proc.StandardOutput.ReadLine();
		// do something with this line of text
	}
}

Now, read binary data from a console process.

using (var proc = new System.Diagnostics.Process
{
	StartInfo = new System.Diagnostics.ProcessStartInfo
	{
		FileName = "/bin/executable",
		Arguments = "-arguments",
		UseShellExecute = false,
		RedirectStandardOutput = true,
		CreateNoWindow = true
	}
})
{
	proc.Start();
	using (BinaryReader reader = new BinaryReader(proc.StandardOutput.BaseStream))
	{
		byte[] chunk = reader.ReadBytes(1024);
		while (chunk.Length > 0)
		{
			// do something with this byte array
			chunk = reader.ReadBytes(1024);
		}
	}
}

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