How Get Start Day of Week?

Question

I have adjusted the first day of week at Region and Local settings in a control panel (Windows 7), and now I'm writing a C++ function that must returns the first day of week which I have adjusted. Any Windows API or standard c++ function that I can use it ?

Thanks

Answer 1

(Sorry what I had written was totally wrong. I have updated the post.)

The right function to use is EnumCalendarInfoExEx:

#include <Windows.h>
#include <strsafe.h>
#include <iostream>

using namespace std;

BOOL CALLBACK EnumCalendarInfoProcExEx(LPWSTR lpszInfo, CALID calendar, LPWSTR lpReserved, LPARAM lParam)
{
    StringCchCopy(reinterpret_cast<LPWSTR>(lParam), 64, lpszInfo);
    return FALSE;
}

int main()
{
    WCHAR szDay[64];
    BOOL bResult = ::EnumCalendarInfoExEx(
        &EnumCalendarInfoProcExEx,
        LOCALE_NAME_USER_DEFAULT,
        ENUM_ALL_CALENDARS,
        nullptr,
        CAL_SDAYNAME1,
        reinterpret_cast<LPARAM>(szDay)
        );

    if (!bResult)
    {
        wcout << L"Error" << endl;
        return 0;
    }

    wcout << szDay << endl;
    return 0;
}

A couple of things to watch out for:

• Even though the first day of the week is configured as Sunday in Control Panel on my PC, this returns Monday...
• Apparently there can be multiple calendars for the user's locale. The above code only gets the first day for the first calendar.

Answer 2

I try use a GetLocaleInfoEx windows API and it worked well :)

int GetSystemStartDayOfWeek()
{
    int   ret;
    DWORD StartDayOfWeek;

    ret = GetLocaleInfoEx(LOCALE_NAME_USER_DEFAULT,
        LOCALE_IFIRSTDAYOFWEEK | LOCALE_RETURN_NUMBER,
        (LPTSTR)&StartDayOfWeek,
        sizeof(StartDayOfWeek) / sizeof(TCHAR));

    return StartDayOfWeek;
}