private static void HandleProcessExit(
Process process,
ProcessExitInfo result)
{
var exited = process.WaitForExit(Consts.ProcessExecutionTimeout);
if (exited)
{
result.ExitCode = process.ExitCode;
result.IsError = result.ExitCode != ReturnCode.Successful;
}
else
{
result.IsError = true;
process.KillProcessAndChildren();
}
}
/// <summary>
/// Execute a process and check for a clean exit to determine if the process exists.
/// </summary>
/// <param name="programName">Name of the program to start.</param>
/// <param name="args">Command line argumentes provided to the program.</param>
/// <param name="waitTime">Time to wait for the process to close.</param>
/// <param name="criterion">Function to evaluate the process response to determine success. The default implementation returns true if the exit code equals 0.</param>
/// <returns></returns>
public static bool Probe(string programName, string args = "", int waitTime = 3000, Func <ProcessExitInfo, bool> criterion = null)
{
try
{
var process = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = programName,
Arguments = args,
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false
}
};
var stdout = new List <string>();
var stderr = new List <string>();
process.OutputDataReceived += (s, e) => stdout.Add(e.Data);
process.ErrorDataReceived += (s, e) => stderr.Add(e.Data);
process.Start();
process.BeginErrorReadLine();
process.BeginOutputReadLine();
process.WaitForExit(waitTime);
var exitInfo = new ProcessExitInfo {
ExitCode = process.ExitCode, StdOut = stdout, StdErr = stderr
};
var exitCode = process.ExitCode;
return(criterion == null ? exitInfo.ExitCode == 0 : criterion(exitInfo));
}
catch (InvalidOperationException)
{
// The excutable failed to execute prior wait time expiring.
return(false);
}
catch (SystemException)
{
// The excutable doesn't exist on path. Rather than handling Win32 exception, chose to handle a less platform specific sys exception.
return(false);
}
}
private static void ReadOutput(string outputFileName, ProcessExitInfo result)
{
if (File.Exists(outputFileName))
{
var count = 5;
while (count > 0)
{
try
{
result.Output = File.ReadAllLines(outputFileName);
break;
}
catch (IOException err)
{
Debug.WriteLine(err.Message);
count -= 1;
Thread.Sleep(500);
}
}
}
File.Delete(outputFileName);
}
private static ProcessExitInfo RunProcess(string appName, string[] args, string outputFileName)
{
var result = new ProcessExitInfo();
var arguments = $"/c {appName} {string.Join(" ", args)} > {outputFileName}";
var process = new Process
{
StartInfo =
{
FileName = "cmd",
Arguments = arguments,
CreateNoWindow = false,
UseShellExecute = false,
RedirectStandardOutput = false,
RedirectStandardError = true
}
};
process.Start();
result.ProcessId = process.Id;
HandleProcessExit(process, result);
result.Errors = process.StandardError.ReadToEnd();
process.Close();
return(result);
}
