_EdLastError( ) API Library Routine Example

The following example displays the error code returned by _EdLastError( ) after a number of editor operations. Since editor errors are reserved for severe situations, such as low memory, The following example will usually display an error code of 0.

Visual FoxPro Code

SET LIBRARY TO EDLASTER
= EDLASTERR("x")  && displays _EdLastError() after operations on file "x"

C Code

#include <pro_ext.h>

void putLong(long n)
{
   Value val;

   val.ev_type = 'I';
   val.ev_long = n;
   val.ev_width = 10;
   _PutValue(&val);
}

FAR Example(ParamBlk FAR *parm)
{
   char FAR *pFileName;
   WHANDLE wh;
   EDENV EdEnv;

   if (!_SetHandSize(parm->p[0].val.ev_handle,
      parm->p[0].val.ev_length+1))
   {
      _Error(182); // "Insufficient memory"
   }
   _HLock(parm->p[0].val.ev_handle);
   pFileName = (char FAR *) _HandToPtr(parm->p[0].val.ev_handle);
   pFileName[parm->p[0].val.ev_length] = '\0';

   wh = _EdOpenFile(pFileName, FO_READONLY);
   _HUnLock(parm->p[0].val.ev_handle);

//   Position past end of file
   _EdGetEnv(wh, &EdEnv);
   _EdSetPos(wh, EdEnv.length + 128);
   _PutStr("\n_EdLastError() ="); putLong(_EdLastError(wh));

//   _EdCopy() with no selection
   _EdSetPos(wh, 1);
   _EdCopy(wh);
   _PutStr("\n_EdLastError() ="); putLong(_EdLastError(wh));

//   _EdScrollToSel() with no selection
   _EdScrollToSel(wh, TRUE);
   _PutStr("\n_EdLastError() ="); putLong(_EdLastError(wh));
}

FoxInfo myFoxInfo[] = {
   {"EDLASTERR", (FPFI) Example, 1, "C"},
};
FoxTable _FoxTable = {
   (FoxTable FAR *) 0, sizeof(myFoxInfo)/sizeof(FoxInfo), myFoxInfo
};