C / C++ / MFC Discussion Boards

Re: Creating an array of global Labels at runtime

NotPolitcallyCorrect31-Mar-13 15:16

NotPolitcallyCorrect

31-Mar-13 15:16

Douglas Kirk wrote:
delete this thread

I don't think you can delete it after is has replies.

Where to post/share example?

ReturnVoid30-Mar-13 1:45

ReturnVoid

30-Mar-13 1:45

Hi,

Just wondering where would I post/share example code/project to share with others? i.e. I have a WIP thing I've done that's not professional but I'd like to share, so not sure if I'd post it as an article or is there somewhere more appropriate.

EDIT: code/project is c++/MFC/OpenGL based, hence why I'm asking here.

Thanks.

Re: Where to post/share example?

NotPolitcallyCorrect30-Mar-13 2:29

NotPolitcallyCorrect

30-Mar-13 2:29

You could probably post it as a Tip/Trick.

Re: Where to post/share example?

Captain Price30-Mar-13 3:27

Captain Price

30-Mar-13 3:27

Articles --> "Submit an article or tip" Thumbs Up | :thumbsup:

Pravinda
the Magician

How to control the other app using Window API

Member 916988729-Mar-13 4:16

Member 9169887

29-Mar-13 4:16

May I know how can I take control of other app using my own program in vc++.
Eg: do a "scroll up" in browser ; open MS Word and save; perform "next/previous" in window photo viewer.. etc

Re: How to control the other app using Window API

dusty_dex29-Mar-13 4:27

dusty_dex

29-Mar-13 4:27

There's either ShellExecute (to launch apps), or the more sophisticated method of using COM/COM+ automation. (formerly known as OLE)

Adding-automation-to-MFC-applications

www.cgoakley.org/prog/oleaut.html

"It's true that hard work never killed anyone. But I figure, why take the chance." - Ronald Reagan

That's what machines are for.

Got a problem?
Sleep on it.

Re: How to control the other app using Window API

Member 916988729-Mar-13 5:38

Member 9169887

29-Mar-13 5:38

how about pressing a hotkey combination (eg: CTRL+S for save)?

Re: How to control the other app using Window API

Richard MacCutchan29-Mar-13 5:59

Richard MacCutchan

29-Mar-13 5:59

Take a look at the SendInput function[^].

Use the best guess

Re: How to control the other app using Window API

Erudite_Eric31-Mar-13 5:04

Erudite_Eric

31-Mar-13 5:04

The classic way os to do a PostMessage() (Or SendMessage()) for which you need tohe window handle of the receiving app and thw WM_COMAND value of te controll you want to manipulate.

You can also do some surprisingly nifty stuff with windows hooks (look at SetWindowsHookEx()) if you want total control of another app.

==============================

Nothing to say.

Is someone willing?

Member 982361929-Mar-13 2:36

Member 9823619

29-Mar-13 2:36

Hey guys!

I'm tryng to learn C++ and I think that I would learn a bit better if I had someone to help me learn, mentor me. I wasn't sure if anyone here had the time and drive to help me out.

When it comes to coding, I'm a pretty quick learner. And I'm finding that a lot of companies want people who know C++.

If this is possible, that would be great! Thumbs Up | :thumbsup:

Thanks for your time.

~ Tyler Candee
About Me | Candee Computers

Re: Is someone willing?

Richard MacCutchan29-Mar-13 3:39

Richard MacCutchan

29-Mar-13 3:39

It's unlikely that you will find anyone to take on such a role here. This site is primarily concerned with answering technical questions, and publishing articles on programme development. There are many other sites around that provide language learning tools: http://www.relisoft.com/cpp.html[^], http://www.winprog.org/[^] and http://www.codeguru.com/cpp/cpp/[^] are a few to get you started.

Use the best guess

Re: Is someone willing?

Member 982361929-Mar-13 8:13

Member 9823619

29-Mar-13 8:13

Thank you! I will check these out for sure.

~ Tyler Candee
About Me | Candee Computers

Shell Link Properties [SOLVED]

Richard Andrew x6428-Mar-13 15:48

Richard Andrew x64

28-Mar-13 15:48

What are some of the shell API's that allow me to retrieve the various properties of a .lnk file?

Properties such as the target file, and maybe the compatibility settings.

SOLUTION:

This link gives all the info: Shell Links[^]

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

AddSourceFilter - passing file path paramater

Vaclav_28-Mar-13 11:47

Vaclav_

28-Mar-13 11:47

Could some learned guru explain to me why is passing a file (path) to this DirectShow "method" so convoluted?
Here is the definition in DirectShow, the variable is “LPCWSTR”:
( long pointer char wide string ????)

HRESULT AddSourceFilter(
[in] LPCWSTR lpwstrFileName,
[in] LPCWSTR lpwstrFilterName,
[out] IBaseFilter **ppFilter
);

Here is may attempt to use it, per MS documentation, but it fails:

hr = pGraph->AddSourceFilter( L"I:\\Briefcase OpenLW\\0 tcc_mdi\\V1\\TCC_MDI_1\\OpenCamera\\DirectShow_test.txt",
L"Source", &pSourceF);
I have not check the return the value of hr , not yet.

Here is another usage in dvapp ( SDK 8.1)
HRESULT CDVGraph::MakeFileToDvGraph_Type1(TCHAR* InputFileName)
{
m_iGraphType = GRAPH_FILE_TO_DV;
HRESULT hr = S_OK;
USES_CONVERSION; // did I missed this ??
// Add the file as source filter to the graph
hr = m_pGraph->AddSourceFilter(T2W (InputFileName ), T2W(InputFileName), &m_pInputFileFilter);
CHECK_ERROR( TEXT(" CDVGraph::MakeFileToDvGraph_Type1::m_pGraph->AddSourceFilter failed."), hr);

The macro T2W is eventually defined in ATL:
#ifdef _UNICODE
#define T2A W2A
#define A2T A2W
inline LPWSTR T2W(LPTSTR lp) { return lp; }
inline LPTSTR W2T(LPWSTR lp) { return lp; }
#define T2CA W2CA
#define A2CT A2CW
inline LPCWSTR T2CW(LPCTSTR lp) { return lp; }
inline LPCTSTR W2CT(LPCWSTR lp) { return lp; }
#else
#define T2W A2W
#define W2T W2A
inline LPSTR T2A(LPTSTR lp) { return lp; }
inline LPTSTR A2T(LPSTR lp) { return lp; }
#define T2CW A2CW
#define W2CT W2CA
inline LPCSTR T2CA(LPCTSTR lp) { return lp; }
inline LPCTSTR A2CT(LPCSTR lp) { return lp; }
#endif

Is this really enhancing the language or just adds / use more memory?
Cheers Vaclav

Re: AddSourceFilter - passing file path paramater

Richard MacCutchan28-Mar-13 22:41

Richard MacCutchan

28-Mar-13 22:41

There is nothing convoluted about it, it is merely trying to allow for different cases, whether the source parameters are in Unicode or ASCII.

Use the best guess

ISamplerGrabber future ??

Vaclav_26-Mar-13 8:01

Vaclav_

26-Mar-13 8:01

OK , I got the DirectShow to "play" an image from a camera in right splitter view of my MFC application. Now I need to capture a single frame and process it in differet splitter pane.
So if I can grab a frame , convert it to bitmap and than to OpenCV image I'be all set.
AFter finding ISamplerGrabber I also found this nice note included in MS documentation about ISampleGrabber.
Are these MS guys for real?
I sure hate to use something they do not support in next month.

Note [Deprecated. This API may be removed from future releases of Windows.]

Re: ISamplerGrabber future ??

Richard MacCutchan26-Mar-13 9:17

Richard MacCutchan

26-Mar-13 9:17

Vaclav_Sal wrote:
Deprecated. This API may be removed from future releases of Windows.

A fairly common note in the MSDN documentation. It's just warning you that this may not be the best option.

Use the best guess

Re: ISamplerGrabber future ??

C^hris L^osinger27-Mar-13 5:03

C^hris L^osinger

27-Mar-13 5:03

and really, it's implied just by virtue of being an MS product.

image processing toolkits | batch image processing

Re: ISamplerGrabber future ??

Richard MacCutchan27-Mar-13 5:15

Richard MacCutchan

27-Mar-13 5:15

Use the best guess

Re: ISamplerGrabber future ??

Joe Woodbury26-Mar-13 9:26

Joe Woodbury

26-Mar-13 9:26

Your posts made me curious. After some hunting around, I discovered that the new multimedia thing is... "Microsoft Media Foundation", which looks like in improved version of DirectShow. It's Windows Vista and later. (If I get crazy enough, I may rework an interactive multimedia product I created in the 90s using VFW to use this.)

Re: ISamplerGrabber future ??

SoMad26-Mar-13 11:57

SoMad

26-Mar-13 11:57

It is true that Microsoft has moved on and left DirectShow behind. I have not gone there because so much of what I do still has to work on Windows XP.

I don't see a lot of articles on the subject, but this one was posted about two weeks ago: Capturing of video from web-camera on Windows 7 and 8 by Media Foundation[^]. To me, the most interesting thing about this article is how he decided to go with Media Foundation because of DirectShow problems on Windows 8.

Soren Madsen

"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty

Re: ISamplerGrabber future ??

Vaclav_28-Mar-13 12:14

Vaclav_

28-Mar-13 12:14

Soren,
thanks for the link.
At this point I am pretty much stuck with DirectShow and would like to finish it.
After breif scan of the article it sure looks as people who like to do something serious;me excluded, I am doing this for "fun"; with video feel pretty much same about convoluted approach by MS.
It reminds me how they struggled with Windows form get-go ( who remembers Window ME?) and IE went pretty much same.
Cheers Vaclav

Re: ISamplerGrabber future ??

SoMad28-Mar-13 20:34

SoMad

28-Mar-13 20:34

Vaclav,

Yes, I know you are working with VC6. I really just posted my comment and the link to that article as a response to Joe Woodbury mentioning the new Microsoft Media Foundation technology. I was not trying to get you to pursue it at this point.

Soren Madsen

"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty

Turbo code implementation in C++

Manoj739025-Mar-13 20:50

Manoj7390

25-Mar-13 20:50

Hi everyone, I am trying to implement turbo encoder, i am not getting how to write the code for D-Flipflop because i am not getting how to access a single bit in C++. please help me out.. Smile | :)

Re: Turbo code implementation in C++

Jochen Arndt25-Mar-13 22:09

Jochen Arndt

25-Mar-13 22:09

In C/C++ single bits are acessed by using logical operators (and: &, or: |, xor: ^, not: ~) with masks with only one bit set. Additional bit operators are the shift left and right operators. An example would be counting the number of bits set in a variable:

C++

unsigned CountBits(unsigned nVal)
{
    unsigned nCount = 0;
    while (nVal)
    {
        // test if lowest bit is set
        if (nVal & 1)
            ++nCount;
        // shift value right by one bit
        nVal >>= 1;
    }
    return nCount;
}

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