?
Solved

What is the best method for rendering bitmaps in an MS windows application window?

Posted on 2015-01-30
4
Medium Priority
?
193 Views
Last Modified: 2015-01-30
Hi:

I'm building a windows based application which will display bitmap frames.
Basically I'm capturing individual frames from a pc camera; doing some analysis
and then wanting to display that frame in a window.

Our current implementation is a 32 bit application  is written in unmanaged C++ .

I've looked at the opencv implementation -->> cv::imshow().
Under the covers, what they are doing would work for us.

But,  rather than have opencv own the window, we want our app to,
so we can add some additional processing.

opencv's implementation is old school windows with doing BitBlt() and StretchBlt()
during the WM_PAINT messages of the target window (owner draw).

Are there other approaches out there which would answer our needs?
Does GDI++ provide any "rendering an image to a target window" functionality?

If our target changed to be a managed winforms or WPF application, what would be the
best prescribed approach?

Thanks in advice for your advice,

JohnB
0
Comment
Question by:jxbma
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 40580770
Are you thinking of something like

void DrawBitmap(HWND hwnd, Gdiplus::Image* pImg) {

  Gdiplus::Graphics graphics(hwnd);
  Gdiplus::Rect rc(0, 0, 800, 400);
  graphics.DrawImage(pImg, rc);
}

// ...

Gdiplus::Image img(L"c:\\path\\image.bmp", FALSE);

DrawBitmap(hwndMyWindow,&img);

Open in new window

?

See also https://msdn.microsoft.com/en-us/library/windows/desktop/ms534462%28v=vs.85%29.aspx ("Image class") and https://msdn.microsoft.com/en-us/library/windows/desktop/ms536051%28v=vs.85%29.aspx ("Graphics.DrawImage(Image*, const Rect) method")
0
 
LVL 1

Author Comment

by:jxbma
ID: 40580791
jkr:: Yes sir, as usual you are spot on your game.

I guess an additional question is:

Would I do this as an "owner draw" in my WM_PAINT message?

Do I have to worry about stretching as the parent window resizes?

Thanks,
JB
0
 
LVL 86

Accepted Solution

by:
jkr earned 2000 total points
ID: 40580799
You can of course do that in yoru WM_PAINT handler, 'owner draw' style or not. If you want to use the window's corners as the 'Rect' used with 'DrawImage()', yes, then stretching would be an issue. If you however use the same seize regardless of the window's actual size, there won't be a problem.
0
 
LVL 1

Author Closing Comment

by:jxbma
ID: 40580848
Right as usual!

Thanks,
JB
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

After several hours of googling I could not gather any information on this topic. There are several ways of controlling the USB port connected to any storage device. The best example of that is by changing the registry value of "HKEY_LOCAL_MACHINE\S…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Viewers will get an overview of how to make and use Drum Racks in Ableton Live. Load new Drum Rack into empty MIDI track: Fill rack with audio samples: Re-arrange sample slots as necessary: Adjust parameters of each slot to tailor each sound a…
Viewers will learn how to use LFOs to modulate the sound of their Sampler instruments. Click the Modulation tab in Sampler: Choose one (or more) of the three available LFOs, and click the respective button to turn it on: Select a waveform, an LF…

719 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question