SOLVED Is USB camera video compressed and in what format?? - C / C++ / MFC Discussion Boards

Re: packaging and deployment, the c++ redistribution file

Aescleal11-May-12 2:22

11-May-12 2:22

Have a 5 'cause I can just imagine some meeting at Microsoft where they decided to use /MT for that reason.

Made me laugh anyway, even if it wasn't intentional.

Thanks all

jkirkerx11-May-12 6:56

jkirkerx

11-May-12 6:56

I'll make the change today, after the Windows 7 test run.

Cool, that's for the tip guys.

How to Change the Blue Selection Color in Edit Control

vishalgpt10-May-12 8:01

vishalgpt

10-May-12 8:01

Hi Everybody, I want to change the color of selecting text in an edit control and I ran out of ideas.

I am totally confused, please anyone guide.

It is a WIN32 C++ Application.

Regards,
Vishal

Re: How to Change the Blue Selection Color in Edit Control

David Crow10-May-12 9:45

David Crow

10-May-12 9:45

That's a Windows setting. You can change it via code, but that may end up irritating the user. In any case, see SetSysColors() and COLOR_HIGHLIGHT.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

Re: How to Change the Blue Selection Color in Edit Control

vishalgpt11-May-12 3:45

vishalgpt

11-May-12 3:45

SetSysColors() works, but it had changed the default COLOR_HIGHLIGHT color to BLACK,

I had used RGB(0,0,0)

This function changes the global highlight color, I want to change highlight color of my edit control only.

How to achieve this.

Regards,
Vishal

Re: How to Change the Blue Selection Color in Edit Control

David Crow11-May-12 3:49

David Crow

11-May-12 3:49

vishalgpt wrote:
I want to change highlight color of my edit control only.

How to achieve this.

Custom control.

Re: How to Change the Blue Selection Color in Edit Control

vishalgpt11-May-12 20:58

vishalgpt

11-May-12 20:58

Hi, I was guessing the same, but i am creating a win32 application,

1) Sould i go with MFC
2) Or Subclass existing edit control in win32 c++

Or some other way if exists:...

Regards,
Vishal

SOLVED Is USB camera video compressed and in what format??

Vaclav_10-May-12 6:55

Vaclav_

10-May-12 6:55

SOLVED
Adding MJPEG driver to my box solved the problem.
Now I need to clean up the test mess I have added to my app!
Moral of the story - when working with OpenCV beware of lack of commnets in the code and always check the logic, it is not the best. I actually feel this is a (logical ) bug and has been in OpenCV since 1.1 and it is still in 2.4.0.

Thanks for all your help.
vaclav

I am trying to display image from USB connected camera.
I know the camera works – I can get a nice image using MS Scanner and Camera wizard.
My problem is that capGetVideoFormat fills the BITMAPINFO biCompression with a value I have no idea what it represents. MSDN is no help in defining this in video frame.
If it is a decompressor info it does not match any of 15 decompression installed on the system.
So
<b>how do I KNOW for sure the USB video is compressed and
how do I use this biCompression value for further processing?</b>

Here is the offending snippet from OpenCV library
BITMAPINFO vfmt;
memset( &vfmt, 0, sizeof(vfmt));
BITMAPINFOHEADER& vfmt0 = vfmt.bmiHeader; // input header
int sz, prevWidth, prevHeight;
if( !capWnd )
return 0;
this fills the biCompression value in question

sz = capGetVideoFormat( capWnd, &vfmt, sizeof(vfmt));
…..............
And this is where attempt to locate the decompressor driver fails

hic = ICLocate (ICTYPE_VIDEO, 0L, (LPBITMAPINFOHEADER) &vfmt,
NULL, ICMODE_DECOMPRESS);

Any suggestions are as always appreciated.
PS I need to stay with capAVI and OpenCV.
Thanks
Vaclav

Re: Is USB camera video compressed and in what format??

CPallini10-May-12 7:10

CPallini

10-May-12 7:10

Vaclav_Sal wrote:
My problem is that capGetVideoFormat fills the BITMAPINFO biCompression with a value I have no idea what it represents.

What is its value?

Veni, vidi, vici.

Re: Is USB camera video compressed and in what format??

Vaclav_10-May-12 7:28

Vaclav_

10-May-12 7:28

1196444237

Re: Is USB camera video compressed and in what format??

Graham Breach10-May-12 7:59

Graham Breach

10-May-12 7:59

If you convert that to hex you get 47504A4D - the characters "MJPG" backwards. So it looks like you need to use a motion JPEG codec.

Re: Is USB camera video compressed and in what format??

CPallini10-May-12 10:48

CPallini

10-May-12 10:48

As already suggested, is M-JPEG (in particular Pinnacle M-JPEG).

Veni, vidi, vici.

Re: Is USB camera video compressed and in what format??

Vaclav_10-May-12 11:03

Vaclav_

10-May-12 11:03

Ok, that is not one of the drivers in the system.
I hope is is no brainer to find it and add to the system.
I sure would like to know where did you find out how to decode this diCompressor value.
And of course how did MS determine that - where is it "advertized".
I did not see anything like that in device driver properties.
Thanks
Vaclav

Re: Is USB camera video compressed and in what format??

Vaclav_10-May-12 12:14

Vaclav_

10-May-12 12:14

I found this under FOURCC, I guess I just answered my own question.
Next time I'll test for the FOURCC code!

<a href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd375802(v=vs.85).aspx">http://msdn.microsoft.com/en-us/library/windows/desktop/dd375802(v=vs.85).aspx</a>[<a href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd375802(v=vs.85).aspx" target="_blank" title="New Window">^</a>]

DrawImage()

john563210-May-12 4:00

john5632

10-May-12 4:00

How to draw an image excepting balck pixel color using gdi DrawImage function?

Re: DrawImage()

C^hris L^osinger10-May-12 4:26

C^hris L^osinger

10-May-12 4:26

see TransparentBlt[^]

image processing toolkits | batch image processing

Re: DrawImage()

peilinok10-May-12 21:03

peilinok

10-May-12 21:03

u can select other pixel color when u create the CPen,
CPen(int nPenStyle,int nWidth,COLORREF crColor);

Issue with CreateControl after migration a workspace which was in VC6 to VS2010

V K 210-May-12 1:13

V K 2

10-May-12 1:13

We have migrated our workspace from VC6.0 to VS2010. There is a CreateControl api which is returning 0 after converting to VS2010. Before conversion this was working fine.

What could be the reason for failure.

Re: Issue with CreateControl after migration a workspace which was in VC6 to VS2010

Richard MacCutchan10-May-12 2:26

Richard MacCutchan

10-May-12 2:26

V K 2 wrote:
What could be the reason for failure.

At a guess, there is a bug in your code. Assuming you mean this function[^] then you can use your debugger to see what is happening. You could also check the value of GetLastError() on failures.

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

what's means？

wangafei9-May-12 21:31

wangafei

9-May-12 21:31

int a:5;
int b:3;

Re: what's means？

Code-o-mat9-May-12 21:47

Code-o-mat

9-May-12 21:47

See here[^] for example.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Re: what's means？

wangafei9-May-12 22:00

wangafei

9-May-12 22:00

thanks！

Re: what's means？

Malli_S10-May-12 0:29

Malli_S

10-May-12 0:29

Have a look at this[^] also.

[Delegates] [Virtual Desktop] [Tray Me !]

-Malli...!

Re: what's means？

wangafei10-May-12 16:47

wangafei

10-May-12 16:47

Malli_S

reference to const int

Aabid9-May-12 21:16

Aabid

9-May-12 21:16

void main()
{
const int i = 10;
int& j = (int&)i;

cout << "i= " << i << endl;
cout << "j= " << j << endl;
cout << "&i= " << &i << endl;
cout << "&j= " << &j << endl;

j++;

cout << "j= " << j << endl;
cout << "i= " << i << endl;
}

//output
i= 10
j= 10
&i= 0012FF60
&j= 0012FF60
j= 11
i= 10

Hi,

the code declares a const integer and a reference to it. incrementing a reference adds 1 to j and outputs as 11, that is fine. i was expecting "i" to get modified, since "i" and "j", both having a same memory address, as i print "i", it outputs 10 (or compiler should not allow to increment j). i could not understand the behavior. Could anybody explains me what is going on behind the scene?

regards
Abid

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