displaying pixels

Posted on 2002-07-02
Last Modified: 2013-11-20
I am doing a project with a digital imaging chip.  I have a program in C++ that reads in a frame through the serial port and I would like to display these image frames in real-time.

How would I go about doing this in simple MFC?  I just need some sort of a dialog that I can throw some buttons on, then have a canvas/drawarea or something that I can refresh every time I get a new image.

Thanks in advance

Question by:Hep_Cat
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Author Comment

ID: 7125259
Just to clarify, the image to display is only 22 x 22, and it is in a 2D array of grayscale ints (0-255).  I need to make the picture larger, i.e. each pixel in the image should take a block of pixels when displayed on the screen.  I need to know which class will let me do this and a little about how it works.
LVL 32

Expert Comment

ID: 7125294
A CStatic will display a CBitmap quite simply.
LVL 12

Expert Comment

ID: 7125322
You have to use DIB bitmap to show your picture since you know data format you can easy create needed DIB and fill it by needeed pixels
look at MSDN  for article
MSJ "March 1997" Q&A by Paul DiLASCIA
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Author Comment

ID: 7125372

I don't have that article.  Creating a DIB or a CBitmap is not my problem.  What do I display them on and how can I update them in real-time as I get the information from the serial port (30 frames/sec)?  Animation?

Author Comment

ID: 7125380

I don't have that article.  Creating a DIB or a CBitmap is not my problem.  What do I display them on and how can I update them in real-time as I get the information from the serial port (30 frames/sec)?  Animation?

Author Comment

ID: 7125412
Sample code would be a great help
LVL 49

Accepted Solution

DanRollins earned 350 total points
ID: 7125587
Make a dialog-based app.  
Add a CStatic control to it (it's tool palette icon looks like a cactus)
Right-click and...
  ... set its ID to IDC_MyBitmap
  ... set Type to Bitmap
  click OK
Press Ctrl+W and in the ClassWizard and click the 'Member Variables' tab
Select ICD_MyBitmap
Click [Add Variable]
  name is: m_ctlMyBitmap
  cateogory: is Control
  vriable type: CStatic
Now you have a canvas and an easy way to update it.

Once you have an HBITMAP, created from the image data, you can simply use:

    m_ctlMyBitmap.SetBitmap( hBmp );

Do this in a loop to get Real Time Animation!
To increase the size, just create twice as large of a bitmap (use StretchBlt or StetchDIBits).  You say you'll have no trouble creating a DIB, so that should be easy for you.

-- Dan

Author Comment

ID: 7127836
That's what I needed!  Thanks

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