Update nf-pathcch-pathcchaddbackslash.md

[oold]

Refer to the PathCchAddBackslashEx function when mentioning the MAX_PATH limitation.

[PRMerger6]

@oold : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[oold]

@jwmsft Actually, after checking in Compiler Explorer, it seems that the PathCchAddBackslash function doesn't have the MAX_PATH limitation at all.

Program:

#define WIN32_LEAN_AND_MEAN
#define NOMINMAX
#include <windows.h>

#include <PathCch.h>
#pragma comment(lib, "pathcch")

#include <cstdlib>
#include <cwchar>
#include <iostream>

int main() {
    wchar_t szMyPath[PATHCCH_MAX_CCH] = L"C:";
    for (SIZE_T i = 0; i < 10; ++i)
        std::wcscat(szMyPath, L"\\qwertyuiopasdfghjklzxcvbnm");
    if (FAILED(PathCchAddBackslash(szMyPath, PATHCCH_MAX_CCH)))
        return EXIT_FAILURE;
    std::wcout << L"Len: " << std::wcslen(szMyPath) << L'\n' << szMyPath << L'\n';
}

Output:

Len: 273
C:\qwertyuiopasdfghjklzxcvbnm\qwertyuiopasdfghjklzxcvbnm\qwertyuiopasdfghjklzxcvbnm\qwertyuiopasdfghjklzxcvbnm\qwertyuiopasdfghjklzxcvbnm\qwertyuiopasdfghjklzxcvbnm\qwertyuiopasdfghjklzxcvbnm\qwertyuiopasdfghjklzxcvbnm\qwertyuiopasdfghjklzxcvbnm\qwertyuiopasdfghjklzxcvbnm\

The entire paragraph could be deleted if that behavior is intended.

[asklar]

it's possible that the behavior might differ on different Windows versions

[oold]

Considering that the page previously mentioned MAX_PATH, I guess it would be okay to keep the pull request the way it is. Someone else can fix that if it's truly wrong. It's not like I can look at the code of this function.