WSTestUTF8String (C Function)
int WSTestUTF8String(WSLINK l, const unsigned char *s, int n)
tests that the next expression to be read from l is a string with the value s, a UTF-8 encoded string of length n.
Details
- WSTestUTF8String() fails if the current object on the link is not a string, or if the value of the string does not match s.
- WSTestUTF8String() returns 0 in the event of an error, and a nonzero value if the function succeeds.
- Use WSError() to retrieve the error code if WSTestUTF8String() fails.
- WSTestUTF8String() will reset the stream pointer to the expression on the link just prior to calling WSTestUTF8String()if the function fails. This operation behaves as if the programmer called WSCreateMark(link); WSTestUTF8String(…); WSSeekToMark(…).
- WSTestUTF8String() is declared in the WSTP header file wstp.h.
Examples
Basic Examples (1)
#include "wstp.h"
/* A function for testing the next expression on the link for a string */
void f(WSLINK l)
{
const unsigned char theString[8];
theString[0] = '$'
theString[1] = 'V';
theString[2] = 'e';
theString[3] = 'r';
theString[4] = 's';
theString[5] = 'i';
theString[6] = 'o';
theString[7] = 'n';
if(! WSTestUTF8String(l, (const unsigned char *)theString,
8))
{ /* The next expression on the link is not $Version */ }
else
{ /* The next expression on the link is $Version */ }
}