_EdGetPos( ) API Library Routine Example

The following example opens an edit session for a file specified by a parameter. After setting the current insertion point with _EdSetPos( ), a call to _EdGetPos( ) is made to verify that it returns the insertion point offset position. After selecting text with _EdSelect( ), a call to _EdGetPos( ) is made to verify that it returns the anchor point offset position.

Visual FoxPro Code

SET LIBRARY TO EDGETPOS
= EDGETPOS("x")

C Code

#include <pro_ext.h>

void putLong(long n)
{
   Value val;

   val.ev_type = 'I';
   val.ev_long = n;
   val.ev_width = 6;

   _PutValue(&val);
}

FAR Example(ParamBlk FAR *parm)
{
#define pFILENAME ((char FAR *) _HandToPtr(parm->p[0].val.ev_handle))

   WHANDLE wh;
   EDPOS edpos;

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

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

   _EdSetPos(wh, 19);
   _PutStr("\n_EdSetPos(wh, 19)");
   edpos = _EdGetPos(wh);
   _PutStr("\n_EdGetPos(wh) ="); putLong(edpos);

   _EdSelect(wh, 5, 12);
   _PutStr("\n_EdSelect(wh, 5, 12)");
   edpos = _EdGetPos(wh);
   _PutStr("\n_EdGetPos(wh) ="); putLong(edpos);
}

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