Process.Start and encoding of output

Hello! I'm trying to read data from a php-script I'm starting:

Code:

---

System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo.FileName = "\"" + sPhp + "php.exe" + "\"";
proc.StartInfo.Arguments = "\"script.php ";
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.RedirectStandardOutput = true;
proc.StartInfo.CreateNoWindow = true;
proc.StartInfo.StandardOutputEncoding = Encoding.UTF32;
proc.Start();
String sOutput = proc.StandardOutput.ReadToEnd();
proc.Close();

---

The php-code does something like:

Code:

---

ob_start();
print '<?xml version="1.0" encoding="UTF-32"?>';
print "<FirstNode>\r\n";
...
print mb_convert_encoding(ob_get_clean(), "UTF-32");

---

When running the php-script from console, it seems that all output is UTF-32. But having a look at sOutput, it only contents of the squares meaning an unprintable char.

Any ideas what could be wrong?