I need to create a simple DLL that when called, will return the time offset from GMT time to my local time (Eastern Standard/Daylight Time)

The code below is basically what I need, but I do not know how to make it work as a DLL (I.E. return the offset).

Any suggestions?



#include "windows.h"
#include "time.h"
#include "stdio.h"

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
 int tz;
 int sOffset;
 char msg[255];
 _tzset();

 tz=_timezone;
 if (tz == 0)
	 sOffset=0;
 else
    sOffset= (tz/60)/60;
sprintf(msg,"%d, sOffset);

MessageBox(NULL,msg,"Debug message",MB_OK);
return 0;

}

-- 

Regards,

Steve Topilnycky
Top Cat Computing
Web:  http://www.topcatcomputing.com/

The best suggestion I can make is pick up a copy of Jeffrey Richter's book "Advanced Windows" which should provide all the info you need on creating DLL's. See www.digitalmars.com/bibliography.html . Amazon lists it used for $12.50 (a bargain!).

-Walter


"Steve Topilnycky" <no.spam.steve@topcatcomputing.com> wrote in message news:MPG.186482e3b6fc4df6989683@news.digitalmars.com...
> I need to create a simple DLL that when called, will return the time offset from GMT time to my local time (Eastern Standard/Daylight Time)
>
> The code below is basically what I need, but I do not know how to make it work as a DLL (I.E. return the offset).
>
> Any suggestions?
>
>
>
> #include "windows.h"
> #include "time.h"
> #include "stdio.h"
>
> int APIENTRY WinMain(HINSTANCE hInstance,
>                      HINSTANCE hPrevInstance,
>                      LPSTR     lpCmdLine,
>                      int       nCmdShow)
> {
>  int tz;
>  int sOffset;
>  char msg[255];
>  _tzset();
>
>  tz=_timezone;
>  if (tz == 0)
> sOffset=0;
>  else
>     sOffset= (tz/60)/60;
> sprintf(msg,"%d, sOffset);
>
> MessageBox(NULL,msg,"Debug message",MB_OK);
> return 0;
>
> }
>
> --
>
> Regards,
>
> Steve Topilnycky
> Top Cat Computing
> Web:  http://www.topcatcomputing.com/
>
>
>

In the c++.chat newsgroup Walter wrote:


> The best suggestion I can make is pick up a copy of Jeffrey Richter's book "Advanced Windows"
> 

Walter, Thanks!  Will do!

Happy Holidays to All!
-- 

Regards,

Steve Topilnycky
Top Cat Computing
Web:  http://www.topcatcomputing.com/

Richter's book has been an invaluable resource for my own win32 programming. Hope you find it as useful.

"Steve Topilnycky" <no.spam.steve@topcatcomputing.com> wrote in message news:MPG.1865702468d9ac49989684@news.digitalmars.com...
> In the c++.chat newsgroup Walter wrote:
>
>
> > The best suggestion I can make is pick up a copy of Jeffrey Richter's
book
> > "Advanced Windows"
> >
>
> Walter, Thanks!  Will do!
>
> Happy Holidays to All!
> --
>
> Regards,
>
> Steve Topilnycky
> Top Cat Computing
> Web:  http://www.topcatcomputing.com/
>
>
>

"Steve Topilnycky" <no.spam.steve@topcatcomputing.com> wrote in message news:MPG.186482e3b6fc4df6989683@news.digitalmars.com...
> I need to create a simple DLL that when called, will return the time offset from GMT time to my local time (Eastern Standard/Daylight Time)

Isn't VB able to call simple Win32 API funcions?
I'm sure there is a way and that would mean you have no use for a seperate
DLL.

Just use the GetTimeZoneInformation API: http://msdn.microsoft.com/library/en-us/sysinfo/base/gettimezoneinformation. asp

I don't know what WScript stands for though.

--
Daniel

In the c++.chat newsgroup Daniel Fazekas wrote:

> I don't know what WScript stands for though.

Windows Scripting Host
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/script56/html/wsconWScriptCScriptOptions.asp

The function is not support via VB or WScript. At least not that I could find.  I use Wscript on my servers to run certain tasks.  Once of which is phrasing a log that is stored in GMT time, and uploading it to a database.  Since, here in the East Cost the offset differs between Daylight Savings time & Daylight Standard time, I need to create a utility DLL to calc the offset.

I thus far have figured out the routine, but when it returns a negative, I get an error from Wscript.  So I must have something declared wrong.. Right now, my return value is a Long INT, would a DWORD be a more appropriate declaration?

Does DM support Data Base connectivity via OBDC?
-- 
Regards,

Steve Topilnycky
Top Cat Computing
Web:  http://www.topcatcomputing.com/