C / C++ / MFC

Re: TerminateThread() which is calling Interop dll function.

8-Mar-10 0:06

As its not a UI thread, better to use an CEvent in MFC to check when to exit the thread..

CPallini8-Mar-10 0:23

CPallini

8-Mar-10 0:23

Cool_Dev wrote:
As its not a UI thread, better to use an CEvent

But first make sure you've read the "Avoid CMutex, CEvent, CSemaphore and CCrticalSection" assay.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: TerminateThread() which is calling Interop dll function.

_T("No name")8-Mar-10 0:24

_T("No name")

8-Mar-10 0:24

Thanks to all of you for ur links and advices Smile | :)

i will read all the eassays and then decide which will be approriate method to do my requirement.

Thakx

Re: TerminateThread() which is calling Interop dll function.

CPallini8-Mar-10 0:30

CPallini

8-Mar-10 0:30

You are welcome.
Smile | :)

Re: TerminateThread() which is calling Interop dll function.

Cool_Dev8-Mar-10 0:49

8-Mar-10 0:49

go for windows APIs for Events instead of using MFC.. no other better ways to request a worker thread to terminate itself..

VLC player

gmallax7-Mar-10 23:10

7-Mar-10 23:10

Hi all,

I am trying to write MJPEG frames into AVI container.
When i try to play the .avi file in VLC player,It displays the following error message:

No suitable decoder module:
VLC does not support the audio or video format "��". Unfortunately there is no way for you to fix this.

How to solve this?

Pls help me.

Cool_Dev8-Mar-10 1:40

8-Mar-10 1:40

check whether the decoder needed to decode the frames you wrote is installed on your system. use microsoft GraphEdit or similar kind of tools to check it..

gmallax9-Mar-10 22:46

9-Mar-10 22:46

hi
I have implemented as following:

UINT_PTR test = (UINT_PTR)processedJpegData; //This is the data to be written into AVI
LPVOID p = reinterpret_cast<LPVOID>(test);

if(!g_bCreated)
{
AVISTREAMINFO streamInfo;
memset(&streamInfo, 0, sizeof(streamInfo));
streamInfo.fccType = streamtypeVIDEO;
streamInfo.fccHandler = mmioFOURCC('M', 'J', 'P', 'G');
//streamInfo.fccHandler = mmioFOURCC('X', 'V', 'I', 'D');
streamInfo.dwScale = 1001;
streamInfo.dwRate = 30000;
streamInfo.dwSampleSize = 0;
streamInfo.dwSuggestedBufferSize = 0 ;
SetRect(&streamInfo.rcFrame, 0, 0,0,0);/* 720, 480,frameInfo.m_width, frameInfo.m_height*/

HRESULT hrCreate = AVIFileCreateStream(m_pAVIFile, &m_pVideoStream, &streamInfo);
if (hrCreate!=AVIERR_OK)
return ;

BITMAPINFOHEADER *bi = new BITMAPINFOHEADER();
bi->biSize = sizeof(BITMAPINFOHEADER);
bi->biWidth = 720;
bi->biHeight = 480;
bi->biPlanes = 1;
bi->biBitCount = 16;
bi->biCompression = mmioFOURCC('M', 'J', 'P', 'G'); // 0 = BI_RGB
bi->biSizeImage = size;
bi->biXPelsPerMeter= 0;
bi->biYPelsPerMeter= 0;
bi->biClrUsed = 0;
bi->biClrImportant = 0;

HRESULT hrSetformat = AVIStreamSetFormat(m_pVideoStream, 0,&bi, 40);
if(hrSetformat != 0)
return;

g_nIndex = AVIStreamLength(m_pVideoStream);
g_bCreated=true;
}

HRESULT hrStreamWrite = AVIStreamWrite(m_pVideoStream, g_nIndex++, 1, p,size, AVIIF_KEYFRAME, 0, 0);
if (hrStreamWrite!=AVIERR_OK)
return ;

This executes successfully and creates the AVI file also.But the problem is in playing that AVI file.

mav@octaval8-Mar-10 2:05

mav@octaval

8-Mar-10 2:05

Are you sure you are writing a correct AVI file? Looks like VLC does not find the fourcc code for your codec (it should be something like MJPG). I am sure that you have a MJPEG codec in your system, but VLC cannot identify your AVI file as coded in MJPG.

--

Si dos montan un caballo, uno debe ir detrás.

gmallax8-Mar-10 18:24

8-Mar-10 18:24

May be.I am using the fourcc code as mmioFOURCC('M', 'J', 'P', 'G').

How can we find whether we wrote a correct AVI file or not?

.AVI file size is 10 mb .

Also,AVIWriteStream function works fine.

So,I assumed that MJPEG frames were written into AVI container.

How to solve this?

gmallax9-Mar-10 22:45

how to use CHtmlEditView in vc 6.0

9-Mar-10 22:45

hi
could u explain this?

I have implemented as following:

UINT_PTR test = (UINT_PTR)processedJpegData; //This is the data to be written into AVI
LPVOID p = reinterpret_cast<LPVOID>(test);

if(!g_bCreated)
{
AVISTREAMINFO streamInfo;
memset(&streamInfo, 0, sizeof(streamInfo));
streamInfo.fccType = streamtypeVIDEO;
streamInfo.fccHandler = mmioFOURCC('M', 'J', 'P', 'G');
//streamInfo.fccHandler = mmioFOURCC('X', 'V', 'I', 'D');
streamInfo.dwScale = 1001;
streamInfo.dwRate = 30000;
streamInfo.dwSampleSize = 0;
streamInfo.dwSuggestedBufferSize = 0 ;
SetRect(&streamInfo.rcFrame, 0, 0,0,0);/* 720, 480,frameInfo.m_width, frameInfo.m_height*/

HRESULT hrCreate = AVIFileCreateStream(m_pAVIFile, &m_pVideoStream, &streamInfo);
if (hrCreate!=AVIERR_OK)
return ;

BITMAPINFOHEADER *bi = new BITMAPINFOHEADER();
bi->biSize = sizeof(BITMAPINFOHEADER);
bi->biWidth = 720;
bi->biHeight = 480;
bi->biPlanes = 1;
bi->biBitCount = 16;
bi->biCompression = mmioFOURCC('M', 'J', 'P', 'G'); // 0 = BI_RGB
bi->biSizeImage = size;
bi->biXPelsPerMeter= 0;
bi->biYPelsPerMeter= 0;
bi->biClrUsed = 0;
bi->biClrImportant = 0;

HRESULT hrSetformat = AVIStreamSetFormat(m_pVideoStream, 0,&bi, 40);
if(hrSetformat != 0)
return;

g_nIndex = AVIStreamLength(m_pVideoStream);
g_bCreated=true;
}

HRESULT hrStreamWrite = AVIStreamWrite(m_pVideoStream, g_nIndex++, 1, p,size, AVIIF_KEYFRAME, 0, 0);
if (hrStreamWrite!=AVIERR_OK)
return ;

This executes successfully and creates the AVI file also.But the problem is in playing that AVI file.

sunnyram7-Mar-10 22:49

sunnyram

7-Mar-10 22:49

I want to use the CHtmlEditView in my vc 6.0 project.

so i added the header file 'afxhtml.h' and then added the following line.

CHtmlEditView htmleditview_object;

then i compiled the project and its giving the error like

error C2501: 'CHtmlEditView' : missing storage-class or type specifiers.

what should i do?

How do i solve this problem?

sunnyram

Re: how to use CHtmlEditView in vc 6.0

Rage8-Mar-10 4:15

Rage

8-Mar-10 4:15

sunnyram wrote:
CHtmlEditView

Is this a MFC project ?

Re: how to use CHtmlEditView in vc 6.0

sunnyram15-Mar-10 3:06

sunnyram

15-Mar-10 3:06

yes this is the MFC project.

sunnyram

error scenerio handling

hrishi3217-Mar-10 22:46

hrishi321

7-Mar-10 22:46

Hi
I need to get enlightten with a concept in C++/vc++ designing....

This is an general question...may be more pertaining to design mechanism of any project

I am trying to find out a good way to or standard method or any standard way to handle all the errro scenerio in a project?

To be more specific, I am doing a project on a protocol analyser....Taking an aaccount of any kind of protocol, what are the good way of handling errors for the same...so that its more scalable,(means we can add more error cases or test cases later easily)

May be an header file where all errrors will be saved as define primitive and handle all of them in a function....Or any good kind of mechanism...

Please enlighten me with the same

thanks in advance

Re: error scenerio handling

Richard MacCutchan8-Mar-10 1:09

Richard MacCutchan

8-Mar-10 1:09

Use Exceptions[^] for all error situations.

txtspeak is the realm of 9 year old children, not developers. Christian Graus

Re: error scenerio handling

Jonathan Davies8-Mar-10 3:28

Jonathan Davies

8-Mar-10 3:28

From experience I've settled on three classes:

1.CMessage: containing the description of an error, though a message doesn't have to describe just an error - "Application started" and "Application stopped", for example, can be included alongside "Widgit X fell over". Initially I used a .h file for this but migrated to using a .mc file as well, the .mc being compiled to produce a .rc resource file.

2.CEventLog: containing some means of logging a message. I started logging to a .txt file, moved to .html and now log to the Windows Event Log via the ReportEvent [^] function.

3.CExError which can be thrown and has a constructor which takes the error information and logs it.

The most productive tactic by far I found was to ensure the file and line numbers where the error occurred were included in the message by using macros such as:

#define AT __FILE__ ":" TOSTRING(__LINE__)

Importantly I found this was a maintainable and expandable (relatively easy to add or edit messages) strategy which:

1. Didn't obscure the actual point of the code (too much) with line after line of error handling.
2. Completely hid away logging of errors in the CExError constructor,
3. Moved away (to the catch block) the point at which any code written to recover needed to go.

So the actual code ended looking something like:

...
void someclass::somefunction(...)
{
    try 
    {
    
        if(!AttemptSomething(param1, param2)
        {
            throw CExError(MESSAGE_ID_1, "Context info", AT);
        }

        if(!AttemptSomethingelse(param1, param2)
        {
            throw CExError(MESSAGE_ID_2, "Context info", AT);
        }
    }
    catch(CExError& err)
    {
        //Decide what to do about any error here, such as:
        if(MESSAGE_ID_2 == err.MessageID)
        {
            MessageBox(err.Message);
        }
    }
    return;
}

...

Problem with DLL running in parallel

Llasus7-Mar-10 22:43

Llasus

7-Mar-10 22:43

Hello,
I have an exe which launches a DLL inside a thread (using CreateInstance) that does some SQL process (retreive, update of data, etc.). Then this exe is launched by some trigger event which is asynchronous.

Now testing this on my environment (Windows XP Service Pack 3, Core 2 DUO @2.33GHz, 2GB of RAM) by triggering the event 2x simultaneously absolutely works. I can see in the log files I've created that the 2 DLL instance are processing in parallel.

The problem is with another server environment that we have (Windows Server 2003 R2 Service Pack 2, Xeon CPU @2.5GHz, 3GB of RAM). When I check the log files, up to the actual launch of the DLL was done simultaneously. But when it came to the DLLs, they seem to be working sequentially. After the 1st DLL is done (which is after 10 mins), then that is the time that the 2nd DLL starts in processing...

Anyone has any idea/clue on this problem? I'm on a dead-end right now. Thanks!

Re: Problem with DLL running in parallel

Graham Breach7-Mar-10 23:21

Graham Breach

7-Mar-10 23:21

Could the two processes be queueing up to use the same resource? Maybe you only have one SQL connection available on the Server machine.

Re: Problem with DLL running in parallel

Llasus8-Mar-10 1:50

Llasus

8-Mar-10 1:50

I have checked the SQL connection and the setting was 6. Then looking at the log files, the actual queuing up happens when the DLL's first function is called (way after the SQL connection/process is being triggered). The other DLL stops/waits until the first DLL is done.
It is highly likely that they're using the same resource... but any possibility that this is somehow the DLL's loading being queued up?

How could I monitor the network adapter status ?

EverettJF7-Mar-10 22:10

EverettJF

7-Mar-10 22:10

I mean ,
when the user disable or enable the adapter, my application could get the notification ,
I am an application level developor ,I know nothing about the Windows Driver Develop.
Is there any API or methods could work?
Thank you!

Re: How could I monitor the network adapter status ?

Adam Roderick J7-Mar-10 22:39

Adam Roderick J

7-Mar-10 22:39

How many adapter do u expect?

Величие не Бога может быть недооценена.

Re: How could I monitor the network adapter status ?

EverettJF8-Mar-10 14:12

EverettJF

8-Mar-10 14:12

I expect to monitor any of the network adapter.
may be 2 ,may be only 1.

Re: How could I monitor the network adapter status ?

Cool_Dev7-Mar-10 22:45