MSMQ error, The stream has returned a read error

dr.burns
dr.burns Member Posts: 6
edited 2004-12-09 in Navision Attain
Hello,

I have created a codeunit (code see below) and a form with a button. The OnPush trigger of the Button calls the function SendMSMQ() of the codeunit.

If I run the codeunit and I click the button in my form, an error message comes up:

The stream has returned a read error

I spent already one whole day to find out whats wrong, but I couldn't.
If I set the property WithEvents of CC2 to NO I can see the
message under Message queue tool of XP with the text Hello world in it. If I set it to yes again, the message seems to be collected from the event, because not visible anymore under the message queue manager of Windows XP.

I found out the error happens on execution of following line:

StreamIn.READTEXT(Text, MAXSTRLEN(Text));

Does anybody have an idea whats wrong?

Thanks a lot!


Here's the code of the codeunit:
OnRun()
IF ISCLEAR(CC2) THEN
  CREATE(CC2);

IF ISCLEAR(MQBus) THEN
  CREATE(MQBus);

CC2.AddBusAdapter(MQBus,1);

MQBus.OpenReceiveQueue('.\private$\navision',0,0);

SendMSMQ()
MQBus.OpenWriteQueue('.\private$\navision',0,0);
OutMsg := CC2.CreateoutMessage('Message queue://');
StreamOut := OutMsg.GetStream();
StreamOut.WRITETEXT('Hello World');
OutMsg.Send(0);

CC2::MessageReceived(VAR InMessage : Automation "''.IDISPATCH")
InMsg := InMessage;
StreamIn := InMsg.GetStream();
StreamIn.READTEXT(Text, MAXSTRLEN(Text));
MESSAGE(Text);
InMsg.CommitMessage();

Global vars:

MQBus:
Automation
'Navision MS-Message Queue Bus Adapter'.MSMQBusAdapter

CC2:
Automation
'Navision Communication Component version2'.CommunicationComponent

InMsg:
Automation
'Navision Communication Component version 2'.InMessage

StreamIn:
InStream

OutMsg:
Automation
'Navision Communication Component version 2'.OutMessage

StreamOut:
OutStream

Text:
Text size 1024

Comments

  • DenSter
    DenSter Member Posts: 8,307
    I don't know what you are accomplishing, other than trying to figure out how to use MSMQ.

    To have a codeunit monitor the MSMQ, you need to change it to a single instance codeunit. What I would do is to have one single instance codeunit monitoring the MSMQ and handling the received messages. Then I'd program sending the message into the form, or in its own codeunit. I don't have much time right now, but when I have some more I'll post an example in here.
    Daniel Rimmelzwaan
    RIS Plus, LLC
  • dr.burns
    dr.burns Member Posts: 6
    Hello DenSter,

    thanks for your reply, yes I am trying out and want to get familiar with MSMQ. If I send a message from a C++ application I get the same error!
    Single instance is already set to YES otherwise I could not receive the message!
    Sending the message using the function in the same codeunit as the MSMQ handling takes place is not the problem. I placed the whole code of the function SendMSMQ also in the form which containes the button but the same result!

    My problem is really the error message:

    The stream has returned a read error

    The code I used in the event trigger comes from somewhere on the board here, so the code seems to work for other people.
    Is there any way to trace this probblem more detailed? What does this error message mean? Is the stream empty oer wrong format or what?

    Really tough, I cannot continue my project because of this error!

    Any more ideas? Thanks!

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