Problem Calling ARexx Command

[tygre]

Hi there!

So I have this code to control various music players via ARexx This code has been working great with dozen of players until I tried it with PlayOGG...

For some reason, with PlayOGG, it blocks on WaitPort(reply_port);, which never returns, and I don't know why! (Doing the same thing using rx works fine.) (I just removed some error-related lines and comments...)

	if(!(reply_port = CreateMsgPort()))
	{
		...
	}

	if(!(rexx_msg = CreateRexxMsg(reply_port, NULL, NULL)))
	{
		...
	}
	rexx_msg->rm_Args[0] = command_temp;
	rexx_msg->rm_Action = RXCOMM | RXFF_RESULT;

	if(!FillRexxMsg(rexx_msg, 1, 0))
	{
		...
	}

	Forbid();
	if(_connect_player() == RETURN_ERROR)
	{
		...
	}
	PutMsg(_arexx_port, &rexx_msg->rm_Node);
	Permit();

	WaitPort(reply_port);
	GetMsg(reply_port);

Would someone have some idea?

Thanks!

[tygre]

PS. Maybe it has to do with my version of rexxsyslib.library?

[tygre]

Hi!

I tried with a more recent version of the library, not joy... PlayOGG doesn't seem to reply to the port

Best!

[tygre]

Hi there!

I wanted to create a MWE and, looking around on the Internet, I found better: Thomas' example! I took Thomas' code, made it compile with VBCC, and tried it simply with rexx playOGG_rx PLAY and (drum roll...) it also gets stuck at WaitPort (replyport)

I modified a bit this MWE to name the replyport (using CreatePort()) and to pass an "argument string" instead of a "plain" string (using CreateArgstring()), still it waits forever I also used SnoopDOS to monitor everything (including ROM calls, etc.) but didn't see anything obvious...

At this point, I don't know what to try... I would give up on PlayOGG but it really bugs me that rx "ADDRESS 'playOGG_rx'; PLAY" works as expected. (It returns!)

Any idea of what I'm missing?

[bebbo]

Have you tried using the name of the rexx port as host? (which is also 'REXX')
Maybe it checks the pointer instead of a strcmp?

or use only RXCOMM as action?

[tygre]

Hi Bebbo!

Thanks for your reply but I still couldn't make my MWE work: I tried both your suggestions but it still blocks on the WaitPort (replyport)... The exact same code works as expected with other players, like EaglePlayer, so this must be some kind of "corner case" of implementing ARexx in PlayOGG (I have never implemented an ARexx interface, so I don't know what corner case that could be!)

I also tried without the WaitPort (replyport) but then sometimes this MWE crashes my Amiga, the others it "blocks" PlayOGG ARexx port, so not a solution

Take care!

[tygre]

Hi all!

Any other suggestions?
Maybe Thomas would see something that we missed in the code?

Please help

[thomas]

There is nothing wrong with your program as far as I can see. I have a similar program to test sending ARexx commands. It works fine with for example WBDock or Workbench. Only with PlayOGG it blocks. So I would suspect an issue in PlayOGG. It executes the command but then does not reply to it, so that the sender is blocked.

[thomas]

I found a hint on the Amiga Developer CD in directory ADCD_2.1:Extras/Development/Example_Code_v37/ARexx/simplerexx

It does not send the command directly to the target port, but it sends the command to the port REXX and sets the target port in CreateRexxMsg().

This works better with PlayOGG, but it does not give any result.

[tygre]

Hi Thomas!

Sorry for the late reply and thanks for your help!

I'm going to make more tests but this seems without good solution, too bad!

Cheers!

[tygre]

Hi Thomas and all!

Just to let you know that AmiModRadio now works with PlayOGG, the problem must have been a combination using "REXX" as port name and waiting actively for a reply (like in some cases for EaglePlayer).

Cheers!