_StrCmp( ) API Library Routine Example

The following example uses _StrCmp( ) to compare two strings passed as parameters.

Visual FoxPro Code

SET LIBRARY TO STRCMP  
? STRCMP("Hello, world.", "Hello, world.")  && matches; returns 0
? STRCMP("Hello, world.", "Hello, wurld.")  && no match; returns non-0

C Code

#include <pro_ext.h>

void NullTerminate(Value FAR *cVal)
{
   if (!_SetHandSize(cVal->ev_handle, cVal->ev_length + 1))
   {
      _Error(182); // "Insufficient memory"
   }
   ((char FAR *) _HandToPtr(cVal->ev_handle))[cVal->ev_length] = '\0';
}

FAR Example(ParamBlk FAR *parm)
{
   int RetValue;

   NullTerminate(&parm->p[0].val);
   NullTerminate(&parm->p[1].val);

   _HLock(parm->p[0].val.ev_handle);
   _HLock(parm->p[1].val.ev_handle);

   RetValue = _StrCmp(_HandToPtr(parm->p[0].val.ev_handle),
      _HandToPtr(parm->p[1].val.ev_handle));

   _RetInt(RetValue, 10); // does return control here

   _HUnLock(parm->p[0].val.ev_handle);
   _HUnLock(parm->p[1].val.ev_handle);
}

FoxInfo myFoxInfo[] = {
   {"STRCMP", (FPFI) Example, 2, "C,C"},
};
FoxTable _FoxTable = {
   (FoxTable FAR *) 0, sizeof(myFoxInfo)/sizeof(FoxInfo), myFoxInfo
};