[Mono-bugs] [Bug 80838][Nor] New - Process.StandardOutput not always using the correct encoding

bugzilla-daemon at bugzilla.ximian.com bugzilla-daemon at bugzilla.ximian.com
Tue Feb 13 15:30:42 EST 2007

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Changed by lluis at ximian.com.


--- shadow/80838	2007-02-13 15:30:42.000000000 -0500
+++ shadow/80838.tmp.28137	2007-02-13 15:30:42.000000000 -0500
@@ -0,0 +1,79 @@
+Bug#: 80838
+Product: Mono: Class Libraries
+Version: 1.2
+OS Details: 
+Status: NEW   
+Priority: Normal
+Component: CORLIB
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: lluis at ximian.com               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+Summary: Process.StandardOutput not always using the correct encoding
+If you start a process using System.Diagnostics.Process, the StandardOutput
+stream is always using utf-8 encoding. The correct behavior would be to use
+the default encoding, since that's the encoding that the process will use
+to write the output.
+Here is a test case:
+using System;
+using System.Diagnostics;
+namespace Xec
+	class MainClass
+	{
+		public static void Main(string[] args)
+		{
+			Console.WriteLine ("se napil žluté vody");
+			if (args.Length > 0) {
+				return;
+			}
+			Console.WriteLine ("Default Encoding: " +
+			ProcessStartInfo pinfo = new ProcessStartInfo ("mono", "Main.exe test");
+			pinfo.UseShellExecute = false;
+			pinfo.RedirectStandardOutput = true;
+			Process p = Process.Start (pinfo);
+			Console.WriteLine ("Output stream encoding: " +
+			Console.WriteLine ("Output from process: " + p.StandardOutput.ReadToEnd ());
+		}
+	}
+Running this app in a system which has utf-8 as default encoding prints the
+following output:
+lluis at portador:~/test> mono Main.exe
+se napil žluté vody
+Default Encoding: utf-8
+Output Stream Encoding: utf-8
+Output: se napil žluté vody
+The first two lines are the output of the app. The other two lines show the
+encoding of the OutputStream and the output read from the other process.
+Everything is correct.
+Now, change the terminal encoding to ISO-8859-2, and run the app like this:
+lluis at portador:~/test> LANG=cs_CZ.latin2 mono Main.exe
+se napil žluté vody
+Default Encoding: iso-8859-2
+Output stream encoding: utf-8
+Output from process: se napil lut vody
+The first line is correctly printed, because System.Console will convert
+the output to latin2, but the output from the process is not correct,
+because the OutputStream of the process is using utf-8 to decode the
+output, which is actually latin2.

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