displaying image in mfc dialog box.

Question

hi,

i am preparing the dialog box which contains a button to open my web cam and start the video session. I am doing this with the help of openCv library. Now, I want to display this frame (from the webcam) inside the same dialog box.

Which control should i use from the toolbox or can anyone provide me the sample code (if any).

 

Thanks in Advance:)

Answer 1

You can use a PictureBox. Covert your frame from IplImage to a CBitmap and call SetBitmap() on your picturebox control.

-Seetharam

Answer 2

hi,

thanks for your reply. But, we are unable to create a variable for the pictureBox once we drag and drop into dialog box.

Hence we are not able to proceed that way.

 

Answer 3

I assume you are using an MFC dialog? So when you say "unable to create a picturebox" what do you mean? When you drag a picture control onto your dialog from the toolbox, do you see it on your dialog?  You would then need to right-click and do a "add variable". Does this step work?

A picture control is nothing but a CStatic with SS_BITMAP style set.

-Seetharam

 

Answer 4

I am not sure what data you are receiving and how streaming is handled but if you are receiving MJPEG You can use CWnd as a base class to render each bitmap frame by using BitBlt for example.

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JohnCz - MVP VC++

Answer 5

yes sir,

You are right. but,

when i drag the picture control from the toolbox to my dialog, the default id is ID_STATIC and when i try to create a variable for the same by a right click on it and choose Add a variable option, i was shown a popup saying that unable to create a variable for static type.

So, i renamed the id as mypic and repeated the process.

Now am able to create the variable for the control but i couldnt display my bitmap image using SetBitmap() function invoked using the variable created.

I would like to display the camera frame dynamically.

Hope you got my problem. Waiting for your sugesstions.

 

Thanks in Advance.

Answer 6

hi sir,

the data format is IplImage available with openCv library.

i am grabing the camera frame using cvQueryFrame() and displaying the frame using api cvShowImage()

Thus every time i grab a camera frame and display the same after my processing operations.

Thus it looks like streaming video.

My problem is...

Doing like this, i could only display my video in separate window but i want to make it appear inside the dialog box.  

Since it is not the bitmap image format, i could not also take advantage of bitblt function.

If converting to bitmap and displaying is the only solution, then i would like to get the code snippet for the iplimage to bitmap conversion.

So it is not MPEJ. It just a image.

Looking forward for your reply.. Thanks in Advance.

 

Answer 7

hy i also have the same problem. if you have solved it then please help me too. 

thanks 

Answer 8

I am sorry for the delay – health issues.

I am not familiar with openCv library, however if you are able to display the image in some window, why don’t you use this window as embedded in a dialog?

Simply create this window as a child of the dialog.

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JohnCz