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| MQGET with Delphi only receive RFH? |
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| edwardkoo |
 Posted: Tue Jan 19, 2010 3:06 am Post subject: MQGET with Delphi only receive RFH? |
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Newbie
Joined: 19 Jan 2010
Posts: 6
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Hi,
I am using Delphi to create an app that retrieve message from MQ server.
After call MQGET my app always only received a single RFH word. How do i get the complete message?
Following is the Delphi code i use to call MQGET
FHobj := 0;
Options := MQOO_FAIL_IF_QUIESCING + MQOO_INPUT_AS_Q_DEF;
ObjDesc := MQOD_DEFAULT;
ObjDesc.ObjectName := 'TESTQ2' + #0;
MQOPEN (FHconn, @ObjDesc, Options, @FHObj, @Compcode, @Reason );
if CompCode <> MQCC_OK then
ShowMessage('Open Failed' + IntToStr(Reason))
BufferLength := 1024; DataLength := 0;
MsgDesc := MQMD_DEFAULT;
GetMsgOptions := MQGMO_DEFAULT;
MQGET ( FHconn, FHobj, @MsgDesc, @GetMsgOptions,
BufferLength, Buffer, @DataLength, @Compcode, @Reason);
if CompCode <> MQCC_OK then
ShowMessage('GET Failed' + IntToStr(Reason)) |
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| zonko |
| Posted: Tue Jan 19, 2010 3:26 am Post subject: |
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Voyager
Joined: 04 Nov 2009
Posts: 78
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I expect you are getting the complete msg, just not displaying it correctly.
For an RFH type msg, the first 4 characters are RFH space, which will display nicely. The next characters will be x00000002, and are non-printable characters.
So, if you are just displaying the buffer returned from MQGET, all you will see is the RFH space. You need to find another way to show the non-printable chars that follow. |
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| edwardkoo |
| Posted: Tue Jan 19, 2010 10:25 pm Post subject: |
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Newbie
Joined: 19 Jan 2010
Posts: 6
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Hi zonko,
You're right. Received complete msg of
RFH ˜ ¸ ¸ <mcd><Msd>jms_bytes</Msd></mcd> L<jms><Dst>queue:///TESTQ2</Dst><Tms>1263959670182</Tms><Dlv>2</Dlv></jms> Test msg from TESTQ2
I think i will copy data start after </jms> tag. I guess that's pretty safe unless there could be more than one occurences of </jms> tag which should not be possible right?
Thanks. |
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| fjb_saper |
| Posted: Wed Jan 20, 2010 11:13 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| edwardkoo wrote: |
Hi zonko,
You're right. Received complete msg of
RFH ˜ ¸ ¸ <mcd><Msd>jms_bytes</Msd></mcd> L<jms><Dst>queue:///TESTQ2</Dst><Tms>1263959670182</Tms><Dlv>2</Dlv></jms> Test msg from TESTQ2
I think i will copy data start after </jms> tag. I guess that's pretty safe unless there could be more than one occurences of </jms> tag which should not be possible right?
Thanks. |
DON'T DO IT THIS WAY.
a) the RFH header has a field describing it's length. As such you can read the corresponding number of bytes from the message. The rest is then the payload.
b) Use the JNDI/URI in JMS to suppress the RFH2 header. A search of the site will give you the details...
Have fun 
_________________
MQ & Broker admin |
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| Vitor |
| Posted: Wed Jan 20, 2010 11:28 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| edwardkoo wrote: |
| I think i will copy data start after </jms> tag. I guess that's pretty safe unless there could be more than one occurences of </jms> tag which should not be possible right? |
Wrong. There might not be another <jms> tag, but there could easily be a <usr> tag, or any of the other tags the RFH2 can contain.
Follow the suggestions of my associate and either parse the RFH2 or suppress it. Don't just chop it up.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| edwardkoo |
| Posted: Wed Jan 20, 2010 6:50 pm Post subject: |
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Newbie
Joined: 19 Jan 2010
Posts: 6
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Hi guys,
I added this param
MsgDesc.Format := MQFMT_STRING;
and i receive only the content message without RFH header now.
Thanks. |
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