C / C++ / MFC Discussion Boards

Re: C++ code to create thread to handle method

Erudite_Eric3-Sep-13 3:52

3-Sep-13 3:52

And these funcitos he is tesing are going to run in seperate processes are they? How likely is that? Perhaps they do share data and use mutexes to manage this and the entire POINT of testing is to make sure they work in the SAME process? Ever thought of that?

Re: C++ code to create thread to handle method

pasztorpisti3-Sep-13 4:22

pasztorpisti

3-Sep-13 4:22

Thanks again for your comments. Have you finished reading my post? The last question tries to find out the intentions of OP. Most of the well written modular multithreaded applications are built up from single threaded components containing the least possible locks and synchronization points between threads that work with separate instances of these single threaded modules. Since the components are usually single threaded most of the test cases are also single threaded and test the functions of a module. It's okay to create a few test cases to test the multithreaded interactions and synchronization points but this won't be the majority of the test cases. Parallelization of test cases within a single threaded component can be achieved safely only with multiprocessing. Actually I've worked on systems that were developed with lots of test cases and some of these systems were multithreaded and some of these were well designed at the same time.

Re: C++ code to create thread to handle method

Erudite_Eric3-Sep-13 21:43

Erudite_Eric

3-Sep-13 21:43

Fortunately opinion and fact are two different things.

Re: C++ code to create thread to handle method

pasztorpisti3-Sep-13 22:00

pasztorpisti

3-Sep-13 22:00

If you think this then you have no clue about correct multithreading. BTW, returning to your first reply: have you read my first answer?

Re: C++ code to create thread to handle method

Erudite_Eric4-Sep-13 4:47

Erudite_Eric

4-Sep-13 4:47

Fortunately opinion and fact are two different things.

Re: C++ code to create thread to handle method

pasztorpisti4-Sep-13 4:51

pasztorpisti

4-Sep-13 4:51

If you think this then you have no clue about correct multithreading. BTW, returning to your first reply: have you read my first answer?

Re: C++ code to create thread to handle method

Erudite_Eric5-Sep-13 21:33

Erudite_Eric

5-Sep-13 21:33

I have done threadding that would make your eyes water.

Re: C++ code to create thread to handle method

pasztorpisti5-Sep-13 22:38

pasztorpisti

5-Sep-13 22:38

I'm not really interested in your threading. BTW, returning to your first reply: have you read my first answer?

Re: C++ code to create thread to handle method

Erudite_Eric3-Sep-13 3:50

Erudite_Eric

3-Sep-13 3:50

Sounds fairly basic to me, did you think of passing a context to each thread, with the context consisting of the function address to call and the parameters needed?

Re: C++ code to create thread to handle method

Eytukan6-Sep-13 2:49

Eytukan

6-Sep-13 2:49

You don't need to change the param & return types of the thread function. leave them as it is.
Just imagine the thread function as a platform to launch your test cases - which would be different functions. Just like the post above, I would choose to go with a data structure that takes in all the parameters required to execute the test case. Including the function pointer. If you are bothered about using function pointers you can even have a switch case block that directs the incoming structure-data to the right function using a normal function call. (it's not the best design I'd say, but it still works).

WORD WINAPI Function( LPVOID lpParam)
{
testcaseData ptcdata* = (testcaseData*) lpParam;
ptcData->Data1, data2.. etc

switch(ptcData->tcID)
{
case 0: 
  TestCase0(...)
case 1:

}

}

And you can use the same Test case index to fill in a Results-vector or list , where it updates the result of the particular test case. The vector can be global or be part of the struct & be protected by a critical section block inside the thread.

Starting to think people post kid pics in their profiles because that was the last time they were cute - Jeremy.

Problem playing (rendering) wave file using WASAPI

AmbiguousName1-Sep-13 19:25

AmbiguousName

1-Sep-13 19:25

Hello. I am trying to play a wave stream through WASAPI. I am trying to use the code available in online msdn. Here is what I am trying.

C++

hResult = pAudioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, 0, 1000000000, 0, pWaveFormatEx, NULL);
if(FAILED(hResult)) return;

UINT nTotalBufferSize = 0;
pAudioClient->GetBufferSize(&nTotalBufferSize);

IAudioRenderClient *pAudioRenderClient = GetRenderClient(pAudioClient);

BYTE* pData = NULL;
hResult = pAudioRenderClient->GetBuffer(nTotalBufferSize, &pData); // get all the buffer

hResult = pAudioClient->GetService(IID_IAudioRenderClient, (void**)&pAudioRenderClient);
if(FAILED(hResult)) return;

::memcpy(pData, pDataPCM, nTotalBufferSize);

hResult = pAudioRenderClient->ReleaseBuffer(nTotalBufferSize, 0);

hResult = pAudioClient->Start(); // Start Playing

DWORD dwFlags = 0;

while(TRUE)
{
    ::Sleep(500);

    UINT nFramesPadding = 0, nFramesAvailable;
    hResult = pAudioClient->GetCurrentPadding(&nFramesPadding);

            /* HERE I MEANT TO DO SOMETHING TO LISTEN TO THIS BUFFER */

    TRACE("%d\n", nFramesPadding);
}

hResult = pAudioClient->Stop();

I am NOT getting any error but I cannot listen to the buffer as well. So what should I do in the loop to listen to this buffer? Thanks.

This world is going to explode due to international politics, SOON.

modified 2-Sep-13 1:33am.

MFCPropertyGridProperty masked edit control

Richard Andrew x641-Sep-13 18:02

Richard Andrew x64

1-Sep-13 18:02

What is the difference between the "edit mask" and the "edit template" when using the masked edit control in the MFCPropertyGridProperty control?

See: http://msdn.microsoft.com/en-us/library/bb983599.aspx[^] The documentation is quite sparse for this control.

The difficult we do right away...
...the impossible takes slightly longer.

Re: MFCPropertyGridProperty masked edit control

D G McKay1-Sep-13 23:17

D G McKay

1-Sep-13 23:17

I think "quite sparse" is an understatement with respect to the documentation! Smile | :)

Have a look at the documentation for CMFCMaskedEdit::EnableMask instead.

http://msdn.microsoft.com/en-us/library/vstudio/bb983268.aspx[^]

Re: MFCPropertyGridProperty masked edit control

Richard Andrew x641-Sep-13 23:35

Richard Andrew x64

1-Sep-13 23:35

Thanks, I didn't think to look there! Smile | :)

The difficult we do right away...
...the impossible takes slightly longer.

about destructor

Syeda Fatimah30-Aug-13 21:40

Syeda Fatimah

30-Aug-13 21:40

Why we use destructors???and what functionality they perform???

Re: about destructor

Richard MacCutchan30-Aug-13 21:57

Richard MacCutchan

30-Aug-13 21:57

https://www.google.com/search?q=destructors+c%2B%2B[^].

Veni, vidi, abiit domum

Re: about destructor

«_Superman_»31-Aug-13 22:58

«_Superman_»

31-Aug-13 22:58

Destructor is a function that is automatically called (by the compiler) when an object on the stack goes out of scope or when delete is called on pointer pointing to an object of a class.
Destructors are normally used to perform cleanup on the object.
Destructors along with constructors form an important concept in C++ called Resource Acquisition Is Initialization or RAII - http://en.wikipedia.org/wiki/Resource_Acquisition_Is_Initialization[^]
This concept is used a lot in several C++ libraries like the STL and Boost.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++) (October 2009 - September 2013)

Polymorphism in C

Re: about destructor

Ajay_Tiwari3-Sep-13 0:40

Ajay_Tiwari

3-Sep-13 0:40

Destructor - cleans memory occupied by Object.

Re: about destructor

Erudite_Eric3-Sep-13 3:47

Erudite_Eric

3-Sep-13 3:47

No it doesnt.

It is a funciton called when an object goes out of scope and can do anything it likes.

Re: about destructor

Ajay_Tiwari15-Sep-13 18:43

Ajay_Tiwari

15-Sep-13 18:43

Destructor is a funtion - cleans memory occupied by Object. when it goes out of scope.

Re: about destructor

Erudite_Eric3-Sep-13 3:47

Erudite_Eric

3-Sep-13 3:47

Because they are automatically called when an object goes out of scope and saves you having to remember to call a kind of 'un_init' function on your object.

Using CDHtmlDialog

Don Guy30-Aug-13 12:58

Don Guy

30-Aug-13 12:58

Hello,

I am trying to use CDHtmlDialog in a MFC dialog based project.

What i want to achieve is pretty sample. Have one image, one button and one text box in the HTML page.

And then dynamically change this based on a timer. i.e., there're multiple images in the folder and it will change every seconds. Once the button is clicked, the timer stops and no more image changes. Same time when image changes the text in the text box also should change.

I know this is pretty simple, but for some reason i am not able to make the image even display in the dialog.

I am using Visual Studio 2012 in Windows 7 machine.

Can somebody share some sample code that does this?

I appreciate your help.

Thanks in advance.

Re: Using CDHtmlDialog

Richard MacCutchan30-Aug-13 21:56

Richard MacCutchan

30-Aug-13 21:56