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Resolved Connecting to MQServer using IBM mqic32.dll

  1. How-to
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  1. Sufyan Maghur
    Sufyan Maghur
  2. PowerBuilder
  3. Tuesday, 12 December 2023 15:22 PM UTC

Good day...

Trying to connect to IBM MQServer using the IBM DLL mqic32.dll

 MQCONN - Connect queue manager - IBM Documentation

The Function Definition in the PB Code

Subroutine MQCONN ( String QMgrName, REF Long Hconn, REF Long CompCode, REF Long Reason ) Library "MQIC32.DLL"

But when we execute the Call we get an error about argument types (I reviewed the Types and they seem to be fine)... Any idea?

Error attached

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Responses (3)
Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Tuesday, 12 December 2023 18:01 PM UTC
  2. PowerBuilder
  3. # 1

Hi Sufyan;

  Just a guess here but ... I am wondering if IBM's API is based on an old version of "C/C++" that uses 1 byte memory alignment vs today's newer C++ compilers (like PB uses) current default of 4 bytes. If that might be the case, try running your PB App under the IDE using this setting ...

HTH

Regards ... Chris

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Sufyan Maghur
  1. Sufyan Maghur
  2. Tuesday, 12 December 2023 19:47 PM UTC
Hi Chris...

I set up as you suggested but still the same error (I am also trying to get an explanation from IBM) not sure If I will have any success :)
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Chris Pollach @Appeon
  1. Chris Pollach @Appeon
  2. Tuesday, 12 December 2023 20:39 PM UTC
Yes, it looks like the next issue could be their API(s) requiring a different data type then what you are passing. :-(
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Sufyan Maghur
Sufyan Maghur Accepted Answer Pending Moderation
  1. Tuesday, 12 December 2023 16:05 PM UTC
  2. PowerBuilder
  3. # 2

Yes it is 32... I even tried their 64 mqic.dll but still the same error

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John Fauss
John Fauss Accepted Answer Pending Moderation
  1. Tuesday, 12 December 2023 16:00 PM UTC
  2. PowerBuilder
  3. # 3

What version/release/build of PB?

Is the DLL 32-bit or 64-bit? Is the PB app 32-bit or 64-bit? The bitness of the app and the DLL must be the same.

Does the DLL expect the string argument to be ANSI-encoded or Unicode? If Unicode, PB can only supply Unicode 16LE (16-bit, Little Endian) encoding. If ANSI, you need to include "ALIAS FOR "MQCONN;ansi" at the end of the external function declaration in order for PB to perform the encoding translation.

Does the DLL use the _stdcall (aka WinAPI) calling interface? PB can only interface with external DLL's that utilize the _stdcall calling interface.

Comment
Sufyan Maghur
  1. Sufyan Maghur
  2. Tuesday, 12 December 2023 16:08 PM UTC
Yes using 32 same as the DLL (I also tried with 64 both BUT still got the same error)

I already tried the ALIAS also just to make sure about the ANSI but still same...
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John Fauss
  1. John Fauss
  2. Tuesday, 12 December 2023 21:02 PM UTC
Do you have access to any (online) documentation regarding this particular DLL function that you can share?
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