_HandToPtr( ) API Library Routine Example
The following example displays its character parameter on the screen. It uses _HandToPtr( ) to translate the memory handle of the API parameter to a C pointer.
SET LIBRARY TO HANDTOPT
= HANDTOPTR("Hello, world.") && displays "Hello, world" on screen
#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)
{
NullTerminate(&parm->p[0].val);
_HLock(parm->p[0].val.ev_handle);
_PutStr(_HandToPtr(parm->p[0].val.ev_handle));
_HUnLock(parm->p[0].val.ev_handle);
}
FoxInfo myFoxInfo[] = {
{"HANDTOPTR", (FPFI) Example, 1, "C"},
};
FoxTable _FoxTable = {
(FoxTable FAR *) 0, sizeof(myFoxInfo)/sizeof(FoxInfo), myFoxInfo
};