Calling MATLAB functions in Visual Basic
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I made a very simple program to try how to call matlab functions in visual basic. My matlab program is this:
function showRGB()
origImage = imread('imagefromvisualbasic.jpg');
redChannel = origImage(:,:,1);
greenChannel = origImage(:,:,2);
blueChannel = origImage(:,:,3);
end
Here's the GUI of the app made in vb.
1. How will I use the imread in matlab to read the image from the openDialogBox of VB?
2. How will I use access the output from MATLAB to show the RGB Channels in the picture box?
Thank you
采纳的回答
Hi,
- you can't. You would need to send over the RGB image data from VB to MATLAB, e.g. by using the PutWorkspaceData method
- the way you have desgined your function you can't. You would need to make the RGB channels output variables
function [redChannel ,greenChannel,redChannel] = showRGB()
and then call the Execute method
ml.Execute("[a,b,c] = showRGB()")
to create the variables a, b and c in the base workspace which you then can get to VB by calling GetWorkspaceData. The example you mentioned does all that.
6 个评论
Elvin
2014-1-18
Thank you very much for the help. I tried fixing my codes but I got an error when running it. here's the new matlab code:
function [redChannel,greenChannel,blueChannel] = showRGB(inputImage)
RGBImage = imread(inputImage);
redChannel = RGBImage(:,:,1);
greenChannel = RGBImage(:,:,2);
blueChannel = RGBImage(:,:,3);
end
Here's the VB program:
Thanks again for the help. Sorry, but I'm not that good in visual basic.
Friedrich
2014-1-20
Hi,
i doubt that the conversion from tghe VB type Image to something MATLAB can use is done automatically. YOu need to convert that by your self. Basically the data converion rules from here
web([docroot '/matlab/matlab_external/handling-com-data-in-matlab-software.html'])
apply. BTW: what does the MATLAB side receive when your try to put the Image data type to the MATLAB workspace?
Elvin
2014-1-20
Friedrich
2014-1-20
I doubt there is an easier way.
You could compile your MATLAB Code with MATLAB Builder NE in order to generate a COM component out of it. You could then use that back in VB. However this wouldn't solve the Image datatype conversion. You would still need to do this on your own.
Elvin
2014-1-20
Friedrich
2014-1-20
I am not really VB programmer but I guess you have to call the save method and save the image into a stream. As a stream use some byte array. I guess googling for that task should give some hints.
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