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POHow to grab parent process standard output?
 

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    <p>I'm writing an utility (<a href="http://reg2run.sf.net" rel="nofollow noreferrer">http://reg2run.sf.net</a>) which in case execution without arguments works as windows application (shows OpenFileDialog, etc), otherwise - as console application.</p> <p>So, in first case I don't want to show a console window, that's why project is Windows Application. But in second - I need to show it, and it's created with </p> <pre><code>if (ptrNew == IntPtr.Zero) { ptrNew = GetStdHandle(-11); } if (!AllocConsole()) { throw new ExternalCallException("AllocConsole"); } ptrNew = CreateFile("CONOUT$", 0x40000000, 2, IntPtr.Zero, 3, 0, IntPtr.Zero); if (!SetStdHandle(-11, ptrNew)) { throw new ExternalCallException("SetStdHandle"); } StreamWriter newOut = new StreamWriter(Console.OpenStandardOutput()); newOut.AutoFlush = true; Console.SetOut(newOut); Console.SetError(newOut); </code></pre> <p>And what I want - is to grab parent process standard output and use it, if it exists (in case execution via cmd.exe or Far Manager). How can I do it?</p> <p>I tried</p> <pre><code>static Process GetParentProc() { int pidParent = 0; int pidCurrent = Process.GetCurrentProcess().Id; IntPtr hSnapshot = CreateToolhelp32Snapshot(2, 0); if (hSnapshot == IntPtr.Zero) { return null; } PROCESSENTRY32 oProcInfo = new PROCESSENTRY32(); oProcInfo.dwSize = (uint)Marshal.SizeOf(typeof(PROCESSENTRY32)); if (!Process32First(hSnapshot, ref oProcInfo)) { return null; } do { if (pidCurrent == oProcInfo.th32ProcessID) { pidParent = (int)oProcInfo.th32ParentProcessID; } } while (pidParent == 0 &amp;&amp; Process32Next(hSnapshot, ref oProcInfo)); if (pidParent &gt; 0) { return Process.GetProcessById(pidParent); } else { return null; } </code></pre> <p>and</p> <pre><code>StreamWriter newOut = GetParentProc().StandardInput; </code></pre> <p>but got InvalidOperationException: StandardIn has not been redirected. Because of</p> <pre><code>GetParentProc().StartInfo.RedirectStandardOutput = false </code></pre>
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