C / C++ / MFC

25-Aug-05 5:35

Hi all,
I am doing a project for uni which basically get images from a logitech quickcam pro 4000 camera, and the guy in our group who compiled our current software has stopped doing the subject and left us with a server/client package that streams the video fine, but encodes using H.263 mpeg encryption not MJPEG and i have absolutely no idea how to convert from one to the other. I found the library used for encryption that he wrote/borrowed and i was wondering if i could email this library to someone, then they tell me which parts to change and i could post the parts that need changing so others can see it as well, as i know that is the policy here, there is just too much code to display in the one message. Any help would be appreciated as I have been left in the deep end here.
regards,
Jordan

If you eat porridge every day you will get sick of it.

David Crow25-Aug-05 8:28

25-Aug-05 8:28

Would it be of any benefit to look at the MJPEG format at www.wotsit.org[^]?

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

-- modified at 10:42 Sunday 28th August, 2005

Galootka27-Aug-05 2:46

27-Aug-05 2:46

I had a look at witsit.org and it said the page is under construction so i couldnt get any MJPEG information from there. Are there any other sites where i can see sample code of MJPEG implementations?

If you eat porridge every day you will get sick of it.

Galootka27-Aug-05 9:01

27-Aug-05 9:01

I have found some code which is here: www.morgan-multimedia.com/downloads/codec.c and i was wondering if anyone can have a look at it and tell me how to implement the code like which function do what etc. It would help me a lot,
Jordan

If you eat porridge every day you will get sick of it.

David Crow28-Aug-05 4:43

28-Aug-05 4:43

Try that link again.

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

Galootka28-Aug-05 4:46

28-Aug-05 4:46

Sorry my bad there is no 's' in download, here is the link again:
http://www.morgan-multimedia.com/download/codec.c

Jordan

If you eat porridge every day you will get sick of it.

David Crow30-Aug-05 9:13

30-Aug-05 9:13

I meant for you to re-try the link I provided.

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

C^hris L^osinger25-Aug-05 9:50

C^hris L^osinger

25-Aug-05 9:50

you might be able to do this with DirectShow.

Cleek | Image Toolkits | Thumbnail maker

converting time

pnpfriend25-Aug-05 5:22

pnpfriend

25-Aug-05 5:22

Hi all,
How am I going to change the given time to given time zone and get the converted time in string format?

let's say.
gmt = +06:30 and giving time dt is in different time zone

following function that I wrote is totally wrong. it is not giving me the correct time string in the given time zone.

CString convertTime(int gmt,COleDateTime dt)
{
COleDateTime formatedDateTime;
COleDateTimeSpan timeSpan(0,gmt,0,0);
formatedDateTime = dt + timeSpan;
dtStr = formatedDateTime.Format("%Y-%m-%d %H:%M:%S");
return dtStr;
}

Thank you so much for your help.

Re: converting time

David Crow25-Aug-05 6:00

25-Aug-05 6:00

Have you seen any of the time-related functions:

localtime()
gmtime()
asctime()
LocalFileTimeToFileTime()
SystemTimeToTzSpecificLocalTime()
TzSpecificLocalTimeToSystemTime()
GetTimeFormat()

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

Re: converting time

Rage25-Aug-05 6:30

Rage

25-Aug-05 6:30

What is the value of gmt ? In your example, it cannot work, because in order to add 6:30 you will have to do the following:

COleDateTimeSpan timeSpan(0,6,30,0);

which cannot be achieved with

COleDateTimeSpan timeSpan(0,gmt,0,0);

Another solution:

transform gmt from an int into a COleDateTime, and do not use any COleDateTimeSpan but only COleDateTime.

~RaGE();

Re: converting time

pnpfriend25-Aug-05 12:53

pnpfriend

25-Aug-05 12:53

Thank you David and Rage for your replies.

I look at gmtime() and it is seems like what I need to use. But dont' really know how to comvert COleDateTime dt to given gmt time.

here what I have..

CString converttime(CString gmt,COleDateTime dt)
{
//let's say gmt="+03:30" and dt = aug 25,2005 6:58pm
//the converted time should be dt3 = aug 26,2005 3:28 am

int hr,min;
CString hrStr,minStr, sign;
int pos = 2;

sign = gmt.GetAt(0);
minStr = gmt.Right(gmt.GetLength()- (pos+1));
hrStr = gmt.Left(pos);
hr = atoi(hrStr);
min = atoi(minStr);

COleDateTime dt2(0,0,0,hr,min,0);
COleDateTime dtDiff = dt+dt2;
}

I got it wrong again.. how can I convert it the given time to the given GMT time that has + and - time?

Thank you so much for your help.

-- modifed at 18:54 Thursday 25th August, 2005

Pipes in Device Drivers

gamitech25-Aug-05 5:15

gamitech

25-Aug-05 5:15

Hello,
I was wondering is there a way that you can make multithreaded pipe server inside WDM device driver to take out to a user-mode aplicaton some variables. Whenever I call DeviceIoControl with the specified control code I get an error. I don't know how to fix the error, but I figured that maybe there is another way of taking out variables out of a device driver without DeviceIoControl (pipes for example Smile | :)

).
Please reply

gabby

Eclipse compared to VC?

Moak25-Aug-05 4:42

Moak

25-Aug-05 4:42

Hi,

does someone use Eclipse/CDT? Would be interesting to know if you can use Eclipse to write MFC applications, I am using VC6 currently.

Thanks!

David Crow25-Aug-05 5:04

25-Aug-05 5:04

I use Eclipse v3.0 for AUIML and Java development. I do not know if an MFC project exists. You might check here.

Why do you not want to use VC6?

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

Moak25-Aug-05 21:26

Moak

25-Aug-05 21:26

DavidCrow wrote:
Why do you not want to use VC6?

I am using VC6 and C/C++ for years and interested in Eclipse as an alternative. Diversity won't harm. With a a 7-8 years old product like VC6 there is a good chance for other IDEs to catch up, especially an open source project like Eclipse with many big guys on the block pushing behind it. Would be interesting for me to hear what developers who used Eclipse think about it.

Nemanja Trifunovic26-Aug-05 2:29

Nemanja Trifunovic

26-Aug-05 2:29

I know Eclipse has support for some open-source GUI frameworks, like FLTK, but I would be very surprised if there were any support for MFC.

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

Moak__27-Aug-05 6:29

Moak__

27-Aug-05 6:29

Hmm, I have VC6 and Eclipse installed on my development PC. VC6 comes with MFC headers and libraries, it should be possible to configure Eclipse/CDT to use tools from the Microsoft Visual Studio directory (compiler, link, make, debugger)? If it's possible, this would give you more or less the opportunity to migrate towards Eclipse and still be able using "good old" MFC. Smile | :)

Just a guess into the blue sky....

David Crow26-Aug-05 2:38

26-Aug-05 2:38

Moak wrote:
I am using VC6 and C/C++ for years and interested in Eclipse as an alternative. Diversity won't harm.

I agree. I thought you wanted to use something else because of an error in VC6 or maybe Eclipse had some whiz-bang feature. By all means learn new tools.

Moak wrote:
Would be interesting for me to hear what developers who used Eclipse think about it.

From just the little bit that I've done with it, my impression is that it is slow. I haven't quite got the folder structure figured out to where I am comfortable with it. Once a project has been downloaded and unzipped, you have to copy a bunch of folders into the Eclipse hierarchy. One good thing I've noticed about it is that the installation is very simple. If you mess up, it's real easy to start over because other files have not been scattered all over and the registry has not been littered with tons of settings.

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