Re: *DTAQ existence API

On 11/10/2016 11:54 AM, Kelly Beard wrote:
> http://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_71/apis/qmhqrdqd.htm
> 
> QMHQRDQD() is an API without an error receiver variable, yet the page lists
> possible error codes.  How do you get these back from the API?  I need a
> good C/C++ example on this.

This particular API returns errors the old fashioned way - as exception
messages.  If the API runs into an issue (like not authorised to the
library) then IBM i will send a message to your program (the caller of
the API) telling you so.

You need to monitor for, and receive those messages.

The whole topic is covered in 'Handling Exceptions in a Program'
https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_72/rzarh/hexcp.htm#hexcp

It's a little upside down to typical C where you get errno via a 'side
channel' and you can check it or not as you see fit.  When IBM i throws
exception messages, your code gets interrupted and a white message
occurs unless you specifically monitor and handle the message.

> Also, isn't there a reason no CRTDTAQ API is available?  Why just a
> command?  That makes it difficult to capture any potential errors on that
> as well.

This works the same as QMHQRDQD(); you handle the exception message that
arises.

-- 
  --buck

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