internal void EnsureActive()
{
uint pid;
if (TryGetProcessId(out pid))
{
return;
}
// Setup a communication channel.
try
{
host = new CHlslHost();
}
catch (System.Runtime.InteropServices.COMException ctorErr)
{
System.Diagnostics.Debug.WriteLine(ctorErr);
// Start the host process.
ProcessStartInfo psi = new ProcessStartInfo("HLSLHost.exe");
try
{
Process p = System.Diagnostics.Process.Start(psi);
}
catch (System.ComponentModel.Win32Exception startErr)
{
System.Diagnostics.Debug.WriteLine(startErr);
throw;
}
System.Threading.Thread.Sleep(200);
host = new CHlslHost();
}
}
internal HhMessageReply GetReply()
{
try
{
var str = host as System.Runtime.InteropServices.ComTypes.IStream;
byte[] response = new byte[8];
str.Read(response, (int)HhMessageHeader.FixedSize, IntPtr.Zero);
System.IO.BinaryReader r = new System.IO.BinaryReader(new System.IO.MemoryStream(response));
uint len = r.ReadUInt32();
if (len == 0)
{
return(null);
}
uint kind = r.ReadUInt32();
switch (kind)
{
case GetPidMsgReplyId:
str.Read(response, 4, IntPtr.Zero);
return(new HhGetPidReply(BytesAsUInt32(response)));
case StartRendererMsgReplyId:
case StopRendererMsgReplyId:
case SetPayloadMsgReplyId:
case (uint)HhMessageId.SetParentHwndMsgReplyId:
str.Read(response, 4, IntPtr.Zero);
return(new HhResultReply(kind, BytesAsUInt32(response)));
case ReadLogMsgReplyId:
response = new byte[len - 8];
str.Read(response, response.Length, IntPtr.Zero);
System.IO.BinaryReader logReader = new System.IO.BinaryReader(new System.IO.MemoryStream(response), Encoding.Unicode);
uint charCount = logReader.ReadUInt32(); // text size.
string text = new string(logReader.ReadChars((int)charCount));
return(new HhLogReply(text));
default:
throw new InvalidOperationException("Unknown reply kind from host: " + kind);
}
}
catch (Exception runError)
{
System.Diagnostics.Debug.WriteLine(runError);
host = null;
throw;
}
}