How do you access the string of an edit box from one gui, in a callback associated with another gui?

Question

Jonathan O'Neill 2014-10-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/157877-how-do-you-access-the-string-of-an-edit-box-from-one-gui-in-a-callback-associated-with-another-gui

评论： Jonathan O'Neill 2014-10-10

In my GUI once I click the button "start" an "m-file" is loaded up (FVBExample2) which takes the information I have entered into my GUI to run tests on a camera. One of the tests is named "KineticSeries" and to tidy things up a bit, the parameters associated with this are entered into a separate GUI which launches when I click the button "Kinetic Series Settings".

I receive this error when I try to run my program...

Reference to non-existent field 'editboxkinserlen'.
Error in FVBExample2 (line 169)
KinSeriesLength=str2num(get(handles.editboxkinserlen,'String'));
Error in CamTestGUIbackupbeforeimage>previmage_Callback (line 1572)
FVBExample2
Error in gui_mainfcn (line 96)
        feval(varargin{:});
Error in CamTestGUIbackupbeforeimage (line 42)
    gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)CamTestGUIbackupbeforeimage('previmage_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

This edit box is located in the second GUI, is there something I should have in front of my code to tell Matlab to look for this box within the second GUI?

Thanks

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Answer 1

Geoff Hayes 2014-10-8

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在 MATLAB Online 中打开

Jonathan - there are a couple ways of doing this. See Sharing between multiple GUIs or how to pass data between guis for examples on how to do this.

In the second link, if the HandleVisibility property for both GUIs are set to on, then you can use findobj function to find the other GUI using its tag. So, in your second GUI (or even from the Command Window), you may look for the first GUI as

hGui = findobj('Type','figure','Tag','GUI1');

where 'GUI1' is the value of the Tag property of the first GUI (typically, the default is figure1).

Then

 if ~isempty(hGui)
    % GUI has been found
    % get widget handles for this GUI
    handlesGui1 = guidata(hGui);
    % now read the data from that GUI widgets
    KinSeriesLength=str2num(get(handlesGui1.editboxkinserlen,'String'));
    % etc.
 end

Try the above and see what happens!

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Jonathan O'Neill 2014-10-9

在 MATLAB Online 中打开

Thanks Geoff that sorted me out! Any idea why I don't get an image after running this code? the frame time and standard deviation come back as "0".

hGui = findobj('Type','figure','Tag','Gui2');
if ~isempty(hGui)
    % GUI has been found
    % get widget handles for this GUI
    handlesGui2 = guidata(hGui);
    % now read the data from that GUI widgets
    KinSeriesLength=str2num(get(handlesGui2.editboxkinserlen,'String'))
    AccumCycleTime=str2num(get(handlesGui2.editboxacummcyctime,'String'))
    KinCycleTime=str2num(get(handlesGui2.editboxkincycletime,'String'))
    Wide=str2num(get(handlesGui2.editboxkinserwidth,'String'))
    High=str2num(get(handlesGui2.editboxkinserheight,'String'))
    DisplayImage=(get(handlesGui2.kinserdisplayimage,'Value'))
    % etc.
 end
if acqvalue==3;
    [ FrameMean, FrameStdDev ] = KineticSeries( KinSeriesLength, AccumCycleTime, KinCycleTime, Wide, High, DisplayImage )
That function contains this code:
function [ FrameMean, FrameStdDev ] = KineticSeries( KinSeriesLength, AccumCycleTime, KinCycleTime, Wide, High, DisplayImage )
%Runs a Kinetic Series and returns mean and Standard deviation
%   Detailed explanation goes here
[ret]=SetAccumulationCycleTime(AccumCycleTime);
[ret]=SetKineticCycleTime(KinCycleTime);
[ret]=SetNumberKinetics(KinSeriesLength);
[ret] = PrepareAcquisition();
ImageArray = zeros(Wide, High);         % Creates array of zeros Xpixels * Ypixels
ret=StartAcquisition;                   % Starts acquisition 
ret=WaitForAcquisition;                 % Waits until Acquisition event occurs
for ImageCount = 1 : KinSeriesLength
      [ret,ImageArray]=GetOldestImage(Wide * High);    % Updates data in array with most recently acquired image (16-bit)
      Image = reshape(ImageArray, Wide, High);     % Returns xpixels by ypixels array whose
      ImageStore(:,:,ImageCount)=Image;
      ImageCount=ImageCount+1;
      if DisplayImage==1
          h=imagesc(Image);                              % Returns the handle for an image graphics object
          set(h,'CData',Image);                      % Set Handle Graphics object properties
          axis xy;
          %set(gca,'YDir','reverse');
          colormap(gray); 
          colorbar;
          drawnow; 
      end
  end
for ImageCount = 1 : KinSeriesLength
      FrameMean(ImageCount)=mean(mean(ImageStore(:,:,ImageCount)));
      SingleFrame(:,:,ImageCount)=double(ImageStore(:,:,ImageCount));
      FrameStdDev(ImageCount)=std(SingleFrame(:));
end
end
But the video readout on my GUI just goes grey...

Geoff Hayes 2014-10-9

在 MATLAB Online 中打开

Jonathan - I don't know what your frame time is: AccumCycleTime, KinCycleTime, or something else? What happens when you put a breakpoint at the first line in the KineticSeries function? When it gets called, do you see reasonable input values (i.e. those as read from the other GUI).

And when you call

h=imagesc(Image);

where is the image being displayed? Can you not specify the axes of where it should be shown i.e. as

h=imagesc(Image,'Parent',myAxesHandle);

Also, is the line

set(h,'CData',Image);

necessary, since CData should already be Image given the previous line

h=imagesc(Image);

As for your image all being grey, it almost (?) seems to match the zero value on the colorbar. Could it be that Image is a matrix of all zeros? In fact, if I do the following

 I = zeros(400,300);
 h=imagesc(I);
 colormap(gray)
 colorbar

then my figure looks identical to your video readout. So what does GetOldestImage do (how does it use the input product of the width with height), and what is the value of ret? I think that this function is returning ImageArray arrays of all zeros.

Jonathan O'Neill 2014-10-10

在 MATLAB Online 中打开

Sorry, I was meant to say "frame mean". the tag of this axes is "axes1" but when I change the code to :

h=imagesc(Image,'Parent',axes1)

this error occurs...

Error in KineticSeries (line 27)
        h=imagesc(Image,'Parent',axes1);
        % Returns the handle for an image graphics
        object

I suppose you could be right, If I remember correctly the value for frame mean and FrameStdDev came back as "0", so maybe this graph is just showing this? the ret function just returns a code to indicate one of these outcomes... I've received the drv_success even without an image showing(maybe just like you said, an image of an array of "0"s) and drv_p2invalid.

DRV_SUCCESS: Image has been copied into array. 
DRV_NOT_INITIALIZED: System not initialized.
DRV_ERROR_ACK: Unable to communicate with card.
DRV_P1INVALID: Invalid pointer (i.e. NULL). 
DRV_P2INVALID:     Array size is incorrect.
DRV_NO_NEW_DATA:  There is no new data yet.

This is the description in the function reference folder I have at work for this function.

[ret, arr] = GetOldestImage(size)

Description This function will update the data array with the oldest image in the circular buffer. Once the oldest image has been retrieved it no longer is available. The data are returned as long integers (32-bit signed integers). The "array" must be exactly the same size as the full image. Inputs size: total number of pixels. Outputs ret: Function return code