C / C++ / MFC

Re: CProgressCtrl freezes during processing

17-Jul-07 7:31

If you choose the classic message pump route, there's an example of an MFC message pump

here[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

Hamid_RT25-Jul-07 8:22

Hamid_RT

25-Jul-07 8:22

Maybe if you use of progress on the timer your problem will be solve.

WhiteSky

winInet - FTP - overlapped i/o operation in progress -

Jayapal Chandran17-Jul-07 6:46

Re: winInet - FTP - overlapped i/o operation in progress -

17-Jul-07 6:46

sasOpen= InternetOpen(szClassName,INTERNET_OPEN_TYPE_DIRECT,NULL,NULL,INTERNET_FLAG_ASYNC);
assConnect = InternetConnect(assOpen,"???.???.???",INTERNET_INVALID_PORT_NUMBER,"sdfgdgdfg","dfgdgdfg",INTERNET_SERVICE_FTP,INTERNET_FLAG_PASSIVE,(long)NULL);

status = FtpGetCurrentDirectory(assConnect,curDir,&curdirLen);
why(GetLastError()); // this function displays the error message as string

//i get "overlapped i/o operation in progress"

i am trying to connect to my ftp server using the above code... opena nd connect are working well
but not the ftpgetcurrentdrectory...
what am i supposed to do ...

Mark Salsbery17-Jul-07 7:44

Re: winInet - FTP - overlapped i/o operation in progress -

17-Jul-07 7:44

Since you've chosen to do the operation asynchronously, you are getting the appropriate error
because the operation hasn't completed.

For asynchronous operations you'll probably want to use InternetSetStatusCallback() and in the
callback you'll be notified when the operation completes (INTERNET_STATUS_REQUEST_COMPLETE).

Also, you probably shouldn't call GetLastError() unless there's actually an error. Not all
APIs reset the last error when they are successful.

Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

Jayapal Chandran17-Jul-07 9:31

Re: winInet - FTP - overlapped i/o operation in progress -

17-Jul-07 9:31

ah, thanks for responding so quickly. thank you. thats nice... i will work with your reply and accordingly i will go for the rest

Jayapal Chandran19-Jul-07 5:39

Re: winInet - FTP - overlapped i/o operation in progress -

19-Jul-07 5:39

void CALLBACK internetCallback( HINTERNET hInternet,
DWORD_PTR dwContext,
DWORD dwInternetStatus,
LPVOID lpvStatusInformation,
DWORD dwStatusInformationLength
);

void CALLBACK internetCallback(HINTERNET hInternet, DWORD_PTR dwContext, DWORD dwInternetStatus, LPVOID lpvStatusInformation, DWORD dwStatusInformationLength)
{
msgbox("something is happening");
}

assOpen= InternetOpen(szClassName,INTERNET_OPEN_TYPE_DIRECT,NULL,NULL,INTERNET_FLAG_ASYNC);
InternetSetStatusCallback(assOpen,(INTERNET_STATUS_CALLBACK) internetCallback);

when i run the program the message dosent gets displayed...
what am i supposed to do ...
some help is needed??? will you...

Mark Salsbery19-Jul-07 6:02

Re: winInet - FTP - overlapped i/o operation in progress -

19-Jul-07 6:02

When you call InternetConnect() you need to pass a value for the dwContext parameter.

From the docs:
"Note The callback function specified in the lpfnInternetCallback parameter will not be called
on asynchronous operations for the request handle when the dwContext parameter of HttpOpenRequest
is set to zero (INTERNET_NO_CALLBACK), or the connection handle when the dwContext handle of
InternetConnect is set to zero (INTERNET_NO_CALLBACK)."

Mark Salsbery
Microsoft MVP - Visual C++

"Thanks,I overlooked the docs."

Jayapal Chandran19-Jul-07 7:25

Re: winInet - FTP - overlapped i/o operation in progress -

19-Jul-07 7:25

wow, its working after giving the dwContext a value of 1... thank you a lot...
we will catch up later... i am working on further...

Mark Salsbery19-Jul-07 7:31

Re: winInet - FTP - overlapped i/o operation in progress -

19-Jul-07 7:31

Here's a tip -

When using callbacks in C++, the callback needs to be a global function or a static member
function. Using C++ it's nice to encapsulate the function within a class but static member
functions can't access non-static members of the class.

This is where the dwContext comes in....you can pass a pointer to a class object then in the
callback, cast the passed context back to an object pointer. With that object pointer you now
have access to the entire class Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Thanks,I overlooked the docs."

Jayapal Chandran19-Jul-07 8:12

Re: winInet - FTP - overlapped i/o operation in progress -

19-Jul-07 8:12

i havent gone through c++ much... anyway this information i am saving for future purpose and one day i might be needing this because i am going to enhance my ftp program to a superficial one...
thank you for there tips...

Jayapal Chandran24-Jul-07 3:13

help: no audio in directshow DES

24-Jul-07 3:13

void Ftp()
{

assOpen= InternetOpen(szClassName,INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,INTERNET_FLAG_ASYNC);

InternetSetStatusCallback(assOpen,(INTERNET_STATUS_CALLBACK) &internetCallback);

assConnect = InternetConnect(assOpen,"???????",INTERNET_INVALID_PORT_NUMBER,"fhfhfgh","fhfghfgh",INTERNET_SERVICE_FTP,INTERNET_FLAG_PASSIVE,(long)1);

}

and i have setup a callback function and is working well...

i am callingthefunction FtpGetCurrentDirectory...
the return value is zero
no effect in the callback
and the getlasterror showed invalid handle...

what's next...

liur1717-Jul-07 5:33

liur17

17-Jul-07 5:33

I wrote a program to trim a segment mpeg file to avi file, the video in the avi file is ok, but I can't output the audio into it. when I try to find out the output pin of the audio group, it returns error code:"the group does not has output pin", should I exract audio from mpeg file to a new file then add it to Timeline? please give any suggestion. my code is following:
//Video
hr = pTL->CreateEmptyNode(&pVideoGroupObj, TIMELINE_MAJOR_TYPE_GROUP);
hr = pVideoGroupObj->QueryInterface(IID_IAMTimelineGroup, (void **)&pVideoGroup);
AM_MEDIA_TYPE mtVideo;
ZeroMemory(&mtVideo, sizeof(AM_MEDIA_TYPE));
mtVideo.majortype = MEDIATYPE_Video;
mtVideo.subtype = MEDIASUBTYPE_RGB555;
mtVideo.pbFormat = (BYTE*)CoTaskMemAlloc(sizeof(VIDEOINFOHEADER));

VIDEOINFOHEADER *pVideoHeader = (VIDEOINFOHEADER*)mtVideo.pbFormat;
ZeroMemory(pVideoHeader, sizeof(VIDEOINFOHEADER));
//the m_mtSrcVideo is AM_MEDIA_TYPE info. gotten from mpeg file.
VIDEOINFOHEADER *pVideoHeader0 = (VIDEOINFOHEADER*)m_mtSrcVideo.pbFormat;
pVideoHeader->bmiHeader.biBitCount = pVideoHeader0->bmiHeader.biBitCount;
pVideoHeader->bmiHeader.biWidth = pVideoHeader0->bmiHeader.biWidth;
pVideoHeader->bmiHeader.biHeight = pVideoHeader0->bmiHeader.biHeight;
pVideoHeader->bmiHeader.biPlanes = pVideoHeader0->bmiHeader.biPlanes;
pVideoHeader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
pVideoHeader->bmiHeader.biSizeImage = DIBSIZE(pVideoHeader->bmiHeader);
mtVideo.formattype = FORMAT_VideoInfo;
mtVideo.cbFormat = sizeof(VIDEOINFOHEADER);
mtVideo.bFixedSizeSamples = TRUE;
mtVideo.lSampleSize = DIBSIZE(pVideoHeader->bmiHeader);
hr = pVideoGroup->SetMediaType(&mtVideo);

hr = pTL->AddGroup(pVideoGroupObj);

hr = pTL->CreateEmptyNode(&pVideoTrackObj, TIMELINE_MAJOR_TYPE_TRACK);

hr = pVideoGroup->QueryInterface(IID_IAMTimelineComp, (void **)&pVideoComp);

hr = pVideoComp->VTrackInsBefore(pVideoTrackObj, 0);
hr = pVideoTrackObj->QueryInterface(IID_IAMTimelineTrack, (void **)&pVideoTrack);

hr = pTL->CreateEmptyNode(&pVideoSourceObj, TIMELINE_MAJOR_TYPE_SOURCE);

hr = pVideoSourceObj->QueryInterface(IID_IAMTimelineSrc, (void **)&pVideoSource);

//Audio
hr = pTL->CreateEmptyNode(&pAudioGroupObj, TIMELINE_MAJOR_TYPE_GROUP);

hr = pAudioGroupObj->QueryInterface(IID_IAMTimelineGroup, (void **)&pAudioGroup);

AM_MEDIA_TYPE mtAudio;
ZeroMemory(&mtAudio, sizeof(AM_MEDIA_TYPE));
mtVideo.majortype = MEDIATYPE_Audio;
mtAudio.subtype = MEDIASUBTYPE_PCM;
mtAudio.bFixedSizeSamples = m_mtSrcAudio.bFixedSizeSamples;
//the m_mtSrcAudio is AM_MEDIA_TYPE info. gotten from mpeg file.
mtAudio.lSampleSize = m_mtSrcAudio.lSampleSize;
mtAudio.formattype = FORMAT_WaveFormatEx;
mtAudio.cbFormat = sizeof(WAVEFORMATEX);
WAVEFORMATEX wf;
ZeroMemory(&wf, sizeof(wf));

WAVEFORMATEX *pwf = (WAVEFORMATEX *)m_mtSrcAudio.pbFormat;
wf.nChannels = pwf->nChannels;
wf.nSamplesPerSec = pwf->nSamplesPerSec;
wf.wBitsPerSample = pwf->wBitsPerSample;
wf.nAvgBytesPerSec = pwf->nAvgBytesPerSec;
wf.nBlockAlign = pwf->nBlockAlign;
wf.wFormatTag = WAVE_FORMAT_PCM;
mtAudio.pbFormat = (BYTE *)&wf;

hr = pAudioGroup->SetMediaType(&mtAudio);

hr = pTL->AddGroup(pAudioGroupObj);

hr = pTL->CreateEmptyNode(&pAudioTrackObj, TIMELINE_MAJOR_TYPE_TRACK);

hr = pAudioGroup->QueryInterface(IID_IAMTimelineComp, (void **)&pAudioComp);

hr = pAudioComp->VTrackInsBefore(pAudioTrackObj, 0);

hr = pAudioTrackObj->QueryInterface(IID_IAMTimelineTrack, (void **)&pAudioTrack);

hr = pTL->CreateEmptyNode(&pAudioSourceObj, TIMELINE_MAJOR_TYPE_SOURCE);

hr = pAudioSourceObj->QueryInterface(IID_IAMTimelineSrc, (void **)&pAudioSource);

//Video
hr = pVideoSourceObj->SetStartStop(0, rtStop - rtStart);

hr = pVideoSource->SetMediaName(lpMpegFileName);
hr = pVideoSource->SetStreamNumber(0);

hr = pVideoSource->SetMediaTimes(rtStart, rtStop);

hr = pVideoTrack->SrcAdd(pVideoSourceObj);

//Audio
hr = pAudioSourceObj->SetStartStop(0, rtStop - rtStart);

hr = pAudioSource->SetMediaName(lpMpegFileName);
hr = pAudioSource->SetStreamNumber(1);

hr = pAudioSource->SetMediaTimes(rtStart, rtStop);

hr = pAudioTrack->SrcAdd(pAudioSourceObj);

hr = CoCreateInstance(CLSID_RenderEngine, NULL, CLSCTX_INPROC, IID_IRenderEngine, (void**)&pRender);
hr = pRender->SetTimelineObject(pTL);
hr = pRender->ConnectFrontEnd( );
hr = pRender->GetFilterGraph(&pGraph);
hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC, IID_ICaptureGraphBuilder2, (void **)&pBuilder);
pBuilder->SetFiltergraph(pGraph);
hr = pBuilder->SetOutputFileName(&MEDIASUBTYPE_Avi, lpAviName, &pMux, NULL);
IPin *pPin0 = NULL;
hr = pRender->GetGroupOutputPin(0, &pPin0);
hr = pBuilder->RenderStream(NULL, NULL, pPin0, NULL, pMux);
IPin *pPin1 = NULL;
//below code return: hr=1, means "the group does not have output pin
//why??????
hr = pRender->GetGroupOutputPin(1, &pPin1);
hr = pBuilder->RenderStream(NULL, NULL, pPin1, NULL, pMux);
hr = pControl->Run();

Sharing without seeing the code, possible?

Joe Smith IX17-Jul-07 4:30

17-Jul-07 4:30

This is not a coding question, but related to Visual C++.

Here is the situation. I am planning to employ several programmers to help me coding. Is there any way to let them add new classes/dialogs/resources without seeing the implementation of my existing classes/dialogs/resources? Of course I want them to be able to use my classes (the main/base classes), but I don't want them to have the whole code (which I wrote for several years) for security and other reasons.

I would appreciate any suggestions or ideas. Thanks.

jhwurmbach17-Jul-07 5:01

jhwurmbach

17-Jul-07 5:01

If you have interfaces (pure virtual classes which do define neither member variables nor any implementation or classes which map their interface on your implementation-classes in your code, you can give them only that.

But as you ask here you probably have neither.

Maybe you can get away with giving them a "cleaned up" version of the headers, with any variable declaration and private function removed as an interface.

That way, they could include your code as a closed-source-lib.

Or these guys set up their own set of mock-objects using your interface?

Failure is not an option - it's built right in.

Joe Smith IX17-Jul-07 5:13

17-Jul-07 5:13

I don't quite get "cleaned up" header approach. Don't I still need to give them the .cpp files so that they can compile the whole project?

I never created a .lib before (but used many). Is there really a way to give them just the .h files without the .cpp, just like a .lib does? This is really what I am going for: they can see the header, but not the implementation.

P.S.: in the "cleaned up" approach, I simply move the variable declaration and private functions to .cpp file?

Thanks for any help.

jhwurmbach17-Jul-07 5:28

jhwurmbach

17-Jul-07 5:28

All my musing about possibilities was nothing for the short-term.

But with a (more or less) limited amount of work, you probably could form your code into a library.

The interface of that library needs to be a working c++ header file with all variables and private members.
Maybe that is OK with you.

If you think your contarctors would get too much information from seeing the variable types you defined, you need to go one step further.
Add an Interface-header, which declares a abstract base class.
You (or them) would then have to implement a "mockup-implementation" of this interface. This may be (probably is) a large amount of work.

That way, they could program against the interface, with only you putting the code together.

In the "cleaned" approach, as many private functions as possible are moved out of the class to an anonymous namespace at the top of the cpp-file.
As your contractors never get to see the content of the cpp-file, you are hiding this code from them.
Functions in an anonymous namespace are effectivly static members, and from my experience, an astounding amount of non-trivial static functions could be made static.

Failure is not an option - it's built right in.

Joe Smith IX17-Jul-07 5:48

17-Jul-07 5:48

Yup, i think that's the best solution here: to change my code into a library.

Although this only "hides" the code that doesn't deal with dialogs/resources, correct?

Thanks a lot.

jhwurmbach17-Jul-07 5:55

jhwurmbach

17-Jul-07 5:55

You can have a lib that is opening dialogs.
But then the project using the lib has to include the libs rc-file:
In the Studio resource-view, right-click on the "PROJECTNAME.rc" and select "resource include" to enter the line
#include "lib-resource-file.h
in the upper and
#include "lib-resource-file.rc"
in the lower box.

Most often, the rc-files do not contain anything special.

Failure is not an option - it's built right in.

Joe Smith IX17-Jul-07 6:26

17-Jul-07 6:26

Cool, a perfect solution then. Thanks a lot.

Mark Salsbery17-Jul-07 6:39

17-Jul-07 6:39

This can be helpful when using Visual Studio to manage multiple resource files:

TN035: Using Multiple Resource Files and Header Files with Visual C++[^]

Especially the part about resource IDs Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

David Crow17-Jul-07 6:37

David Crow

17-Jul-07 6:37

Joe Smith IX wrote:
Is there really a way to give them just the .h files without the .cpp, just like a .lib does?

Yes.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne