_StrLen( ) API Library Routine
Returns the length in bytes of the specified null-terminated string.
int _StrLen(char FAR *string)
char FAR *string; /* String to be measured. */
Example
The following example is similar to the Visual FoxPro function LEN( ), but can't handle strings with embedded '\0'.
Visual FoxPro Code
SET LIBRARY TO STRLEN
? STRLEN("Hello") && returns 5
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)
{
NullTerminate(&parm->p[0].val);
_HLock(parm->p[0].val.ev_handle);
_RetInt(_StrLen(_HandToPtr(parm->p[0].val.ev_handle)), 10);
_HUnLock(parm->p[0].val.ev_handle);
}
FoxInfo myFoxInfo[] = {
{"STRLEN", (FPFI) Example, 1, "C"},
};
FoxTable _FoxTable = {
(FoxTable FAR *) 0, sizeof(myFoxInfo)/sizeof(FoxInfo), myFoxInfo
};
See Also
Reference
_StrCmp( ) API Library Routine
_StrCpy( ) API Library Routine