Release Mode EXE shows error ? - C / C++ / MFC Discussion Boards

ArunKumar Yalamarthy10-Oct-05 20:09

10-Oct-05 20:09

I was refering to time shown by system as "systemtime", Some places observe Day Light Saving,for Example when you see GMT-6:00, U.S and Canada,...zone, you can see that there is an option called "automatically adjust clock for daylight saving "when we select this, on a certain well known day system time
changes by one hour automatically, for eg: in GMT-6:00 we can see on first sunday of april, system time jumps from 1:59:59am to 3:00am, my question is how to detect changes like this is due to this windows option or someone has manually changed it? Confused | :confused:

Thanks
Arun

Re: Detecting Day Light Saving (DST)?

ArunKumar Yalamarthy10-Oct-05 22:38

ArunKumar Yalamarthy

10-Oct-05 22:38

Ok, I got the answer, we can use the follwoing

DayLightSaving detection techniques:

1.In windows XP,we can implement WM_TIMECHANGE handler and in this handler we can call
GetTimeZoneInformation() to obtain Bias value,The bias is the difference, in minutes, between Coordinated Universal Time (UTC) and local time, and this value changes when DayLightSaving event or TimeZone change event occurs.

2.Other workaround, where WM_TIMECHANGE does not work for DayLightSaving, you can monitor the value of ActiveTimeBias in following key HKLM\System\CurrentControlSet\Control\TimeZoneInformation. you can monitor it using RegNotifyChangeKeyValue() function.These values also change when DayLightSaving event or TimeZone change event occurs.

If we want to know whether change in system time is due to change in timezone or Day Light Saving, you can monitor the value of name of timezone, that is "Standard Name". if there is no change in timezone name but if there is change in bias time
it is due to day light savings event. Smile | :)

Thanks
Arun

Compairing last modification date of a file

ashtwin10-Oct-05 3:07

ashtwin

10-Oct-05 3:07

Hi,
i am compairing the last modification date of a file on FAT file system and the same file on NTFS file system. But the date is not matching. Can anybody tell me how to do that correctly. I am retreiving the date from WIN32_FIND_DATA structure.
Thanks.

Re: Compairing last modification date of a file

David Crow10-Oct-05 3:18

David Crow

10-Oct-05 3:18

ashtwin wrote:
But the date is not matching.

Could it be because the date/time properties of the files are different?

What does the code snippet look like that is doing the comparison?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Re: Compairing last modification date of a file

John M. Drescher10-Oct-05 3:28

John M. Drescher

10-Oct-05 3:28

Because of the way fat stores times (rounded to the nearest two seconds) there may be a 2 second difference between NTFS and FAT times.

John

Re: Compairing last modification date of a file

Anonymous10-Oct-05 16:47

Anonymous

10-Oct-05 16:47

Also NTFS stores file times to somthing like 10-7 seconds so compairing will be dificult. I would abs to less than 3 or 4 seconds.

Re: Compairing last modification date of a file

ashtwin10-Oct-05 19:02

ashtwin

10-Oct-05 19:02

Hi,
i am comparing the same copy on both FAT and NTFS. I think it is because of DST. Can anybody give me some idea about DST(day light saving).

Release Mode EXE shows error ?

Amarelia10-Oct-05 2:23

Amarelia

10-Oct-05 2:23

Hi
I have a dialog based MFC application in which on my dialog I have two Microsoft Web Browser ActiveX control and show sites after certain interval. For this I hide one ActiveX control and show another continuously.

My application works fine when I compile them in Debug mode but when I compile them in Release mode it shows some error which reads as

"The instruction at "0x6c3bd643" referenced memeory at "0x0000003c". The memory could not be "read". Click on OK to terminate the program, Click on Cancel to debug the program

And when I press on Cancel it shows "Unhandled Exception in MYPrj.exe(MFC42.dll):0x0000005c: Access Violation"

What seems to be the reason.....Even I could not debug it by putting break point as it's release mode....Is there any idea what to do and how to over come ?

Thanking you all....

Amarelia Maehsh
Gujarat
India