How I can check the button if enabled or disabled in MATLAB?

I wanna use if condition to check if the button is Enable or Disable can I do that ?

Answer 1

[Jan]

Actually the question is far too lean to be answered reliably. But a guess:

if handles.Checkbox1.Value

This is sufficient already, when I assume, that handles.Checkbox1 is the handle of your checkbox. Examine the tag of the checkbox or the handles struct to find the real name in your code.

[EDITED] The solution with R2015b and teh property "Enable" is:

if strcmp(handles.Button1.Enable, 'off')

If you handles.msg is a uint8, it is not a valid button handle.

[Adam]

if strcmp( handles.Checkbox1.Enable, 'on' )

would be the equivalent for testing if it is enabled, if that is what is actually being asked, unless it is just poor discrimination of terminology.

[Eliza]

It is a button not checkbox I set my button default is to be disabled using this line of code

set(handles.msg,'Enable','off')

My goal is to check if the state of this button is off or not using if condition can I do it in button or not? this command has an error

if strcmp( handles.msg.Enable, 'off' )
     set(handles.msg,'Enable','on')
    end

[Eliza]

I ran this code

if strcmp( handles.msg.Enable, 'off' )==1
     set(handles.msg,'Enable','on')
   end

and this is the error

Struct contents reference from a non-struct array object.
  Error in wmark_e>inp_Callback (line 137)
     if strcmp( handles.msg.Enable, 'off' )==1

[Jan]

Which Matlab version are you using? For < R2014 you need:

get(handles.msg, 'Enable')

instead of

handles.msg.Enable

If you get the error message "Struct contents reference from a non-struct array object", the best idea is to use the debugger to find out, which struct is meant. Type this in the command window:

dbstop if error

Run the code again until it stops. Now you can check in the command window, what the problem is:

class(handles)
class(handles.msg)
class(handles.msg.Enable)

What do you get? Using the debugger is more efficient than waiting for an answer in the forum.

[Eliza]

thank you for your respond ,Iam using Matlab2015b I follow you steps here is the output when I ran dbstop if error

138    if strcmp( handles.msg.Enable, 'off' )==1

Then I follow the remaining steps

class(handles)

ans =

struct

K>> class(handles.msg)

ans =

uint8
K>> class(handles.msg.Enable)
Struct contents reference from a non-struct array object.

[Adam]

handles.msg is a uint8, this is not a UI component of any type so doesn't have an 'Enable' property.

[Eliza]

It is a button in my interface and It has the enable properties I set it in this line of code and there is no error

set(handles.msg,'Enable','off')

[Eliza]

I just wanna make if statement to that button if it is enable or not

[Jan]

@Eliza: As Adam has explained already: Your handles.msg is not the handle of a button. Your statement "it is a button in my interface and It has the enable properties" must be wrong, if the class of handles.msg is a uint8. As soon as you provide a valid button handle, this will work:

if strcmp(handles.Button1.Enable, 'off')

We cannot guess, why your handles.msg is a uint8, but you can inspect your code to find out, where this field has been defined in this way.

[Eliza]

Here is the properties of msg

(msg) with properties:

              Style: 'pushbutton'
             String: 'First'
    BackgroundColor: [0.9400 0.9400 0.9400]
           Callback: [function_handle]
              Value: 1
           Position: [55.2000 16.6923 22 2.6923]
              Units: 'characters'
BackgroundColor: [0.9400 0.9400 0.9400]
           BeingDeleted: 'off'
             BusyAction: 'queue'
          ButtonDownFcn: ''
                  CData: []
               Callback: [function_handle]
               Children: [0x0 handle]
              CreateFcn: ''
              DeleteFcn: ''
                 Enable: 'on'
                 Extent: [0 0 14.8000 1.6154]
              FontAngle: 'normal'
               FontName: 'MS Sans Serif'
               FontSize: 10
              FontUnits: 'points'
             FontWeight: 'bold'
        ForegroundColor: [0 0 0]
       HandleVisibility: 'on'
    HorizontalAlignment: 'center'
          Interruptible: 'on'
            KeyPressFcn: ''
          KeyReleaseFcn: ''
             ListboxTop: 1
                    Max: 1
                    Min: 0
                 Parent: [1x1 Panel]
               Position: [55.2000 16.6923 22 2.6923]
             SliderStep: [0.0100 0.1000]
                 String: 'Watermark'
                  Style: 'pushbutton'
                    Tag: 'msg'
          TooltipString: ''
                   Type: 'uicontrol'
          UIContextMenu: [0x0 GraphicsPlaceholder]
                  Units: 'characters'
               UserData: [1x0 double]
                  Value: 1
                Visible: 'on'

[Jan]

@Eliza: Why do you post the properties? Note, that this is a contradiction to what you have posted before:

class(handles.msg)
ans =
  uint8

Please try to find out, why your handles.msg is sometimes an UINT8 and sometimes a graphics handle. Perhaps you overwrite it anywhere? But if it is a graphics handle, my suggestion should work directly. Did you try it?

Answer 2

[Walter Roberson]

At some point in your code, you are overwriting handles.msg with a uint8 array. Search your code for assignments to handles.msg