Thread: StringCchLength & StringCbLength wrong output

Hey guys,

I find it hard to understand what exactly with the below code.
even copy pasted from the book which im using to learn, same wrong output.

Code:

#include <windows.h>
#include <strsafe.h>
#include <wchar.h>

int wmain(void) { 

    wchar_t str[] = L"ZetCode";
    size_t target_size = 0;

    size_t size = sizeof(str);

    HRESULT r = StringCbLengthW(str, size, &target_size);
    
    if (SUCCEEDED(r)) {

        wprintf(L"The string has %lld bytes\n", target_size);
    } else {

        wprintf(L"StringCbLengthW() failed\n"); 
        return 1;
    }

    size = sizeof(str)/sizeof(wchar_t);

    r = StringCchLengthW(str, size, &target_size);
    
    if (SUCCEEDED(r)) {

        wprintf(L"The string has %lld characters\n", target_size);
    } else {

        wprintf(L"StringCchLengthW() failed\n"); 
        return 1;
    }

    return 0;
}

my output when i run is

The string has 28429359194832910 bytes
The string has 28429359194832903 characters
Press any key to continue...

whereas the output according to book and what i read in the MSDN documentation should be

The string has 14 bytes
The string has 7 characters

Note that i even copy pasted the code from book,, still got a wrong output. where did i go wrong?

You need to pay attenstion to the compiler warnings:
main.cpp(16): warning C4477: 'wprintf' : format string '%lld' requires an argument of type '__int64', but variadic argument 1 has type 'std::size_t'
main.cpp(16): note: consider using '%zd' in the format string
main.cpp(30): warning C4477: 'wprintf' : format string '%lld' requires an argument of type '__int64', but variadic argument 1 has type 'std::size_t'
main.cpp(30): note: consider using '%zd' in the format string

size_t is an unsigned type. It requires a "%zu" as the format specifier.