Re: C program for QDFRTVFD API

Hi Jevgeni

Thank you for your reply , much appreciated.
However I am not sure what you mean.
I am happy to be corrected if I am wrong.

From my code you can see.
I only Create and Populate the Userspace  for the #FIRST record.

       /* On First pass get the API data */
       memmove(Funct,p_iFunc, strlen(p_iFunc));
         if (!memcmp(Funct, "#FIRST", 6)) {
            RtvApiDta();
            };

On the #NEXT calls I just get the pointer to the Userspace.

         if (!memcmp(Funct, "#NEXT", 5)) {
    /*! call RetrievePointerToUserSpace - Retrieve Pointer to User Space */
           errorCode.BytesProvided = 0;
           RetrievePointerToUserSpace("RTVFDUSPC QTEMP      ",
                            &pBuffer,
                            &errorCode);
       }

Also I  Delete the User space when there are no more fields to get.

    Odata->EndDta   = 0;
   /* End ofthe Fields  */
      if ((EndFlds EQ 1) && (FldIdx EQ p_QDFFRINF->WDFFFLD -1) ) {
        Odata->EndDta   = 1;
         *GotIt = 1;
        DeleteUserSpace("RTVFDUSPC QTEMP      ",
                        &errorCode);
       };


So I believe I am doing the code correctly exactly how you describe it
should be done.

Regards
Frank


> •Subject: Re: C program for QDFRTVFD API
> •From: Jevgeni Astanovski <jevgeniast@xxxxxxxxx>
> •Date: Thu, 18 Sep 2014 10:16:46 +0300
>Frank,
> After careful examining of your DISPINFOC1 program I should say that
> probably you misunderstood the idea of using user space.
> Currently your program is not simply inefficient, but it is
> "dangerously" inefficient in case you apply it to display files having
> really big number of fields.
>  ...
> So after the first call (give me first) you fill the user space by a
> number of FieldData_t structures (for all fields). And put the 2
> integers in the beginning appropriately. Then you send out the first
> structure and increment the pointer to the first unsent structure.
> When you get "give me next" call, you do not call QDFRTVFD any more!
> You rather get the user space and send away the first unsent structure
> and increment the pointer. If the pointer to the next reached the end,
> you inform the caller about that with the last structure.
> This is one of the possible solutions using user space.
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