Find handle objects - MATLAB (2024)

Syntax

Hmatch = findobj(H)
Hmatch = findobj(H,property,value,...,property,value)
Hmatch = findobj(H,'-not',property,value)
Hmatch = findobj(H,'-regexp',property,expression)
Hmatch = findobj(H,property,value,logicaloperator,property,value)
Hmatch = findobj(H,'-function',fh)
Hmatch = findobj(H,'-function',property,fh)
Hmatch = findobj(H,'-class',class)
Hmatch = findobj(H,'-isa',class)
Hmatch = findobj(H,'-property',property)
Hmatch = findobj(H,'-method',methodname)
Hmatch = findobj(H,'-event',eventname)
Hmatch = findobj(H,'-depth',d,___)


Description

Hmatch = findobj(H) returns the objects listed in H and all of their descendants.

Hmatch = findobj(H,property,value,...,property,value) finds handle objects that have the specified property set to the specified value (compared using isequal).

Hmatch = findobj(H,'-not',property,value) inverts the expression in the following property value pair. That is, find objects whose specified property is not equal to value.

Hmatch = findobj(H,'-regexp',property,expression) uses the regular expression defined in expression to find properties with specific values. Not all classes supported the use of regular expression to find property values.

Hmatch = findobj(H,property,value,logicaloperator,property,value) applies the logical operator to the name/value pairs. Supported logical operators include:

Hmatch = findobj(H,'-function',fh) calls the function handle fh on the objects in H and returns the objects for which the function returns true.

Hmatch = findobj(H,'-function',property,fh) calls the function handle fh on the specified property’s value for the objects in H and returns the objects for which the function returns true. The function must return a scalar logical value.

Hmatch = findobj(H,'-class',class) finds all objects belonging to the specified class.

Hmatch = findobj(H,'-isa',class) finds all objects belonging to the specified class.

Hmatch = findobj(H,'-property',property) finds all object in H having the named property.

Hmatch = findobj(H,'-method',methodname) finds objects that have the specified method name.

Hmatch = findobj(H,'-event',eventname) finds objects that have the specified event name.

Hmatch = findobj(H,'-depth',d,___) specifies how many levels in the instance hierarchies under the objects in H to search.

Specify all -options as character vectors or string scalars.

Input Arguments

Output Arguments

Attributes

To learn about attributes of methods, see Method Attributes.

Object with Specific Property Value

Find the object with a specific property value. Given the handle class, BasicHandle:

classdef BasicHandle < handle properties Prop1 end methods function obj = BasicHandle(val) if nargin > 0 obj.Prop1 = val; end end endend

Create an array of BasicHandle objects:

h(1) = BasicHandle(7);h(2) = BasicHandle(11);h(3) = BasicHandle(27);

Find the handle of the object whose Prop1 property has a value of 7:

h7 = findobj(h,'Prop1',7);h7.Prop1

ans = 7

Object with Specific Property Name

Find the object with a specific dynamic property. Given the button class:

classdef button < dynamicprops properties UiHandle end methods function obj = button(pos) if nargin > 0 if length(pos) == 4 obj.UiHandle = uicontrol('Position',pos,... 'Style','pushbutton'); else error('Improper position') end end end end end

Create an array of button objects, only one element of which defines a dynamic property. Use findobj to get the handle of the object with the dynamic property named ButtonCoord:

b(1) = button([20 40 80 20]);addprop(b(1),'ButtonCoord');b(1).ButtonCoord = [2,3];b(2) = button([120 40 80 20]);b(3) = button([220 40 80 20]);h = findobj(b,'-property','ButtonCoord');h.ButtonCoord

ans = 2 3

Find Objects Using Regular Expressions

Find objects based on the value of object properties using regular expressions. While findobj has a -regexp options, not all classes support this option. This example uses the -function option to use a regular expression from a function as an alternative to the -regexp option.

classdef FindRegExpr < handle properties Name end methods (Static) function b = regXArray b = FindRegExpr.empty(0,50); for i = 1:50 b(i).Name = sprintf('%d',i); end end endendA = FindRegExpr.regXArray;

a = 1×50 FindRegExpr array with properties: Name

subArray = findobj(a, '-function', 'Name', @(x) ~isempty(regexp(x, '^1\d*')));

subArray = 11×1 testRegExpr array with properties: Name

Tips

Extended Capabilities

Version History

Introduced in R2008a

See Also

findprop