[CWB] CQi error report system

[Hardie, Andrew]

In cqpserver.c. there is the following pair of lines:

if (!cqp_parse_string(cqp_query))
  cqi_command(CQI_CQP_ERROR_GENERAL); /* should be changed to detailed
error messages */ 

... Which suggests that this feature is simply not finished yet. But I'm
not sure how you'd modify that to get the right error constant; the
return value of cqp_parse_string() obviously isn't enough information.

CQI_CTRL_LAST_GENERAL_ERROR probably ought to be giving you a better
error message than this, the reason it doesn't (I suspect!) is that the
error-string-setting function cqi_general_error() is not being called at
this point. 

I'm reluctant to dive in and change any of this since my understanding
of CQi is somewhat minimal - Stefan knows it much better than I do.

Andrew.

> -----Original Message-----
> From: cwb-bounces at sslmit.unibo.it 
> [mailto:cwb-bounces at sslmit.unibo.it] On Behalf Of Matthieu Decorde
> Sent: 13 October 2010 15:57
> To: Open source development of the Corpus WorkBench
> Subject: [CWB] CQi error report system
> 
> 
>   Hi,
> 
> We use CQi in our TXM application and we want to retrieve CQP 
> syntax error reports from the cqpcl server.
> 
> I saw that CQi defines some constants about CQP errors in cqi.h :
> #define CQI_CQP_ERROR_GENERAL 0x0501
> #define CQI_CQP_ERROR_NO_SUCH_CORPUS 0x0502 #define 
> CQI_CQP_ERROR_INVALID_FIELD 0x0503 #define 
> CQI_CQP_ERROR_OUT_OF_RANGE 0x0504
> 
> But it seems that the 0x0501 code is the only error code that 
> CQi is able to return.
> 
> For example, requests like je" return 0x0501, but the std 
> output stream of cqpserver reports a "No such corpus error".
> 
> I also tried the CQI_CTRL_LAST_GENERAL_ERROR command, but it 
> seems that it is not its job to report this kind of error.
> When I call it it always reports "No error".
> 
> Did I miss something about the CQi errors reporting system ?
> 
> By the way, after a "No such corpus error", the next request 
> fails, is there a way to tell CQi to cancel the previous requests ?
> 
> Thanks for your help,
> Matthieu Decorde
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