Another setlocale(), _gmtime64_s(), _time64() and strftime() C function examples

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Target platform: none, just for learning

Header file: Standard and Windows

Additional library: Windows Platform SDK

Additional project setting: Set project to be compiled as C

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C Code (/TC)

Other info: non-CLR or unmanaged

To do: Usage of setlocale() when using two independent threads

To show: Using the setlocale(), _gmtime64_s(), _time64() and strftime() C function examples

// setlocale(): This program demonstrates the use of setlocale() when using two independent threads.

#include <locale.h>

#include <process.h>

#include <windows.h>

#include <stdio.h>

#include <time.h>

#define BUFF_SIZE 100

// Retrieve the date and time in the current locale's format.

int get_time(unsigned char* str)

{

__time64_t ltime;

struct tm thetime;

// Retrieve the time

_time64(&ltime);

_gmtime64_s(&thetime, &ltime);

// Format the current time structure into a string using %#x is the long date representation, appropriate to the current locale

if (!strftime((char *)str, BUFF_SIZE, "%#x", (const struct tm *)&thetime))

{

printf("strftime failed!\n");

return 1;

}

return 0;

}

// This thread sets its locale to German and prints the time.

unsigned __stdcall SecondThreadFunc(void* pArguments)

{

unsigned char str[BUFF_SIZE];

// Set the thread local

printf("The thread locale is now set to %s.\n", setlocale(LC_ALL, "Dutch"));

// Retrieve the time string from the helper function

if (get_time(str) == 0)

{

printf("The time in Dutch locale is: '%s'\n", str);

}

_endthreadex(0);

return 0;

}

// The main thread spawns a second thread (above) and then sets the locale to English and prints the time.

int main(void)

{

HANDLE hThread;

unsigned threadID;

unsigned char str[BUFF_SIZE];

// Configure per-thread locale to cause all subsequently created threads to have their own locale.

_configthreadlocale(_ENABLE_PER_THREAD_LOCALE);

// Retrieve the time string from the helper function

printf("The thread locale is now set to %s.\n", setlocale(LC_ALL, "English"));

// Create the second thread.

hThread = (HANDLE)_beginthreadex(NULL, 0, &SecondThreadFunc, NULL, 0, &threadID);

if (get_time(str) == 0)

{

// Retrieve the time string from the helper function

printf("The time in English locale is: '%s'\n\n", str);

}

// Wait for the created thread to finish.

WaitForSingleObject(hThread, INFINITE);

// Destroy the thread object.

CloseHandle( hThread );

}

Output example:

The thread locale is now set to English_United States.1252.

The time in English locale is: 'Sunday, December 17, 2006'

The thread locale is now set to Dutch_Netherlands.1252.

The time in Dutch locale is: 'zondag 17 december 2006'

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