ddlSetChangeCb() - set Change Callback

ddlSetChangeCb() - set Change Callback ddlSetChangeCb() - set Change Callback

Prototype:

   void ddlSetChangeCb(
      CONTROL *ctl,
      void (*UserChange)(),
      WtCastPtr UserWord)

Description:
Posts a callback to allow the user to make dynamic changes to records being written or rewritten by the ddlWrite() and ddlChange() functions. This is especially useful since the record number is available in the callback.

ddlSetChangeCb(ctl,0,UserWord) results in the change callback being turned off.

Currently used by:
ddlChange()
ddlWrite()

Callback Description:
The prototype for the change callback is:
   void __stdcall UserChange(WtCastPtr UserWord,char *dgname,char *image,long recno);
   where UserWord is the ddlSetChangeCb() parameter;
      dgname is the ASCII table name of image;
      image is the record image in the database (not the RD image);
      recno is the 1-relative record number;

The VB compatible form of this command is not defined.