So, I am creating a C# program to run a command prompt command when a button is pressed, this is the code that executes when the button is pressed:
private void button1_Click(object sender, EventArgs e)
{
System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Maximized;
string arg = textBox1.Text + "& exit";
process.StartInfo.Arguments = arg;
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardInput = true;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.FileName = "cmd.exe";
process.StartInfo = startInfo;
process.Start();
string outp = process.StandardOutput.ReadToEnd();
string error = process.StandardError.ReadToEnd();
StreamWriter myStreamWriter = process.StandardInput;
myStreamWriter.WriteLine(textBox1.Text);
textBox2.Text = outp;
process.WaitForExit();
}
Maybe it's something obvious that I am missing, if it is, I am sorry(I am kind of a beginner at C#), but I can't, for the life of me, figure out why I get an exception thrown out of system.dll that reads as follows:
An unhandled exception of type 'System.InvalidOperationException' occurred in System.dll
Additional information: Cannot start process because a file name has not been provided.
However, I have provided a file name (line 5 of code snippet). Any help is GREATLY appreciated, thanks.
P.S.
This code uses:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Diagnostics;
To run properly.
process.StartInfo = startInfo; //Here problem is there, you are
//refreshing "process.StartInfo" with "startInfo". As "startInfo" is empty in your code.
//So use below code
System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Maximized;
string arg = textBox1.Text + "& exit";
startInfo.Arguments = arg;
startInfo.UseShellExecute = false;
startInfo.RedirectStandardInput = true;
startInfo.RedirectStandardOutput = true;
startInfo.FileName = "cmd.exe";
process.StartInfo = startInfo;
process.Start();
Related
I am having an issuing trying to get a form app on visual studio 19 to execute a cmd on command line for converting a video from mp4 to avi.
I am using ffmpeg for this but everytime I compile it wont pick anything up.
I have ran the argument through command line and it converts the video just fine. The path as far as I am aware is correct so I am not sure why the compiler wont pick up on any files.
private void Button1_Click(object sender, EventArgs e)
{
string cmdString = "c:\ffmpeg\bin";
ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.CreateNoWindow = false;
startInfo.UseShellExecute = false;
startInfo.FileName = "ffmpeg.exe";
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.Arguments = cmdString + $"-i shatner.mp4 shatner.avi";
using (Process exeProcess = Process.Start(startInfo))
{
exeProcess.WaitForExit();
}
}
}
}
The error I am getting:
"The system cannot find the specified file"
Also I would have put a try catch block around the Process.Start but it doesnt matter since it is still throwing the exception.
Your fileName and arguments are specified incorrectly. Please see below.
private void button1_Click(object sender, EventArgs e)
{
ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.CreateNoWindow = false;
startInfo.UseShellExecute = false;
startInfo.FileName = "c:\\ffmpeg\\bin\\ffmpeg.exe";
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.Arguments = "-i shatner.mp4 shatner.avi";
startInfo.RedirectStandardOutput = true;
startInfo.RedirectStandardError = true;
using (Process exeProcess = Process.Start(startInfo))
{
string error = exeProcess.StandardError.ReadToEnd();
string output = exeProcess.StandardError.ReadToEnd();
exeProcess.WaitForExit();
MessageBox.Show("ERROR:" + error);
MessageBox.Show("OUTPUT:" + error);
}
}
I'm trying to run some Git commands from a C# program using System.Diagnostics.Process and it's not working. Git is in my path and when I try to run the command at the command prompt it works fine. I've tried capturing the standard output using a nested using() statement and that's not helping. When it gets to the reader.ReadToEnd() it just shows the DOS window hung with nothing in it. Here's my code:
System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.RedirectStandardOutput = true;
startInfo.RedirectStandardError = true;
startInfo.UseShellExecute = false;
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Maximized;
startInfo.WorkingDirectory = "c:\\gitmover";
startInfo.FileName = "cmd.exe";
startInfo.Arguments = " git add \"*.*\"";
using (Process process = Process.Start(startInfo))
{
using (StreamReader reader = process3.StandardOutput)
{
string result = reader.ReadToEnd();
}
}
Any ideas what I could be doing wrong?
So I created an URL protocol to run an application with the command arguments.
Here is my code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using Microsoft.Win32;
using System.Diagnostics;
namespace iw4Protocol
{
class Program
{
static void Main(string[] args)
{
RegistryKey key = Registry.ClassesRoot.OpenSubKey("gameProtocol");
if (key == null)
{
string iw4FullPath = Directory.GetCurrentDirectory();
gameProtocol protocol = new gameProtocol();
protocol.RegisterProtocol(gameFullPath);
}
else
{
RegistryKey gamepathkey = Registry.ClassesRoot.OpenSubKey("gameProtocol");
string gamepath = gamepathkey.GetValue("gamepath").ToString();
Environment.SetEnvironmentVariable("path",gamepath);
ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.FileName = #"test.exe";
startInfo.Arguments = Environment.CommandLine;
Process.Start(startInfo);
}
}
}
}
The problem is that the program need some files to get launched but it can't load them because the path isn't 'set'.
How I can set this path to launch all these needed files (like /cd command)?
If you want to set the PATH environment variable and use it in your process, add it to the Environment variables but you have to set UseShellExecute to false in that case:
ProcessStartInfo startInfo = new ProcessStartInfo();
// set environment
startInfo.UseShellExecute = false;
startInfo.EnvironmentVariables["PATH"] += ";" + gamepath;
// you might need more Environment vars, you're on your own here...
// start the exe
startInfo.FileName = #"test.exe";
startInfo.Arguments = Environment.CommandLine;
// added for debugging
startInfo.RedirectStandardOutput = true;
startInfo.RedirectStandardError = true;
var p = new Process();
p.StartInfo = startInfo;
using(var sw = new StreamWriter(File.Create("c:\\temp\\debug.txt"))) // make sure C:\temp exist
{
p.OutputDataReceived += (sender, pargs) => sw.WriteLine(pargs.Data);
p.ErrorDataReceived += (sender, pargs) => sw.WriteLine(pargs.Data);
p.Start();
p.BeginOutputReadLine();
p.BeginErrorReadLine();
p.WaitForExit();
}
After looking on forums, I have written this snippet:
public string ExecuteCmd()
{
System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
startInfo.FileName = "cmd.exe";
startInfo.Arguments = this.m_command;
process.StartInfo = startInfo;
process.Start();
string output = process.StandardOutput.ReadToEnd();
process.WaitForExit();
return output;
}
The m_command is member of a class, initialized in the constructor.
For my tests, it is net user. When the compiler arrives at this point, I get the following exception:
StandardOut has not been redirected or the process hasn't started yet.
Where is my mistake?
You need this:
//....
startInfo.Arguments = "/C " + this.m_command;
process.StartInfo = startInfo;
process.StartInfo.RedirectStandardOutput = true;
process.Start();
//....
I am trying to create a Windows Forms C# project that interacts with the command prompt shell (cmd.exe).
I want to open a command prompt, send a command (like ipconfig) and then read the results back into the windows form into a string, textbox, or whatever.
Here is what I have so far, but I am stuck. I cannot write or read to the command prompt.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Diagnostics;
using System.IO;
namespace WindowsFormsApplication1
{
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
System.Diagnostics.Process p = new System.Diagnostics.Process();
p.StartInfo.UseShellExecute = false;
p.StartInfo.FileName = "cmd.exe";
p.StartInfo.Arguments = "/k dir *.*";
p.StartInfo.RedirectStandardError = true;
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.RedirectStandardOutput = true;
p.Start();
StreamWriter inputWriter = p.StandardInput;
StreamReader outputWriter = p.StandardOutput;
StreamReader errorReader = p.StandardError;
p.WaitForExit();
}
}
}
Any help would be greatly appreciated.
Thanks.
Here is a SO question that will give you the information you need:
How To: Execute command line in C#, get STD OUT results
Basically, you ReadToEnd on your System.IO.StreamReader.
So, for example, in your code you would modify the line StreamReader errorReader = p.StandardError; to read
using(StreamReader errorReader = p.StandardError)
{
error = myError.ReadToEnd();
}
var yourcommand = "<put your command here>";
var procStart = new System.Diagnostics.ProcessStartInfo("cmd", "/c " + yourcommand);
procStart.CreateNoWindow = true;
procStart.RedirectStandardOutput = true;
procStart.UseShellExecute = false;
var proc = new System.Diagnostics.Process();
proc.StartInfo = procStart;
proc.Start();
var result = proc.StandardOutput.ReadToEnd();
Console.WriteLine(result);