Printing current system time in C++

hi all,

I'm trying to print out the current time using C++. I'm using Microsoft visual studio 2008..

Code:

---


#include <windows.h>
#include <stdio.h>
#include <time.h>

#ifndef WINDOWS
#include <sys/time.h>
#endif


#ifdef WINDOWS
  SYSTEMTIME      beg;
#else
  struct timeval  beg; 
  struct tm      *t;       
#endif


#ifdef WINDOWS
  GetLocalTime( &beg );

  printf( "%02d:%02d:%02d:%06d\n", beg.wHour,
    beg.wMinute, beg.wSecond, beg.wMilliseconds * 1000 );
#else
  gettimeofday( &beg, NULL );
  t = localtime( &beg.tv_sec );

  printf( "%02d:%02d:%02d.%06d\n",
    t->tm_hour, t->tm_min, t->tm_sec, (int) beg.tv_usec );
  #endif

---

Getlocaltime() functin doesn't seem to work.. What's the problem? Any help is appreciated..

First, you need a main function in your code (c code):

Code:

---

#include <windows.h>
#include <stdio.h>
#include <time.h>

#ifndef WINDOWS
#include <sys/time.h>
#endif


int main(){

#ifdef WINDOWS
        SYSTEMTIME      beg;
#else
        struct timeval  beg; 
        struct tm      *t;       
#endif


#ifdef WINDOWS
        GetLocalTime( &beg );

        printf( "%02d:%02d:%02d:%06d\n", beg.wHour,
                beg.wMinute, beg.wSecond, beg.wMilliseconds * 1000 );
#else
        gettimeofday( &beg, NULL );
        t = localtime( &beg.tv_sec );

        printf( "%02d:%02d:%02d.%06d\n",
                t->tm_hour, t->tm_min, t->tm_sec, (int) beg.tv_usec );
#endif
        return 0;
}

---

Next, open the project properties (Alt+F7) in your Visual Studio and select "Configuration Properties>C/C++>Preprocessor" and add WINDOWS to the Preprocessor Definitions or, add directly in the code

Code:

---

#include <windows.h>
#include <stdio.h>
#include <time.h>
#define WINDOWS
...

---

If you're gonna have those #ifdefs for WINDOWS then you might as well put this inside too:

Code:

---

#ifdef WINDOWS
#include <windows.h>
#endif

---

Although I'm not sure why you need any platform specific code just to print the time. These standard functions should be all you need: Standard C Date & Time [C++ Reference]