MATLAB: Store and Retrieve simple text box content using GUI

MATLABmatlab gui

Dear users

I have a question about store and retrieve IDs and names by using matlab , following my simple GUI and there are only two (text box 1 , text box 2) when i entered some authors names along with its ids ,

then for search purpose I need to enter only the ID then when i press search will retrieve the name correspond to that id , is there any way to do that i will thank any one can help me in this manner ..

Best Answer

doc containers.map

should help with this if your IDs are not guaranteed to be contiguous and starting from 1. There are examples in the help and using numeric indices is very easy anyway. It has the advantage over an array that your indices can be any numeric (or string) value.

If you are struggling with the underlying GUI aspect of it then that is a different matter, but a containers.Map object should work well to store all your data, assuming IDs are unique which seems a safe assumption given you are searching based on them.

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MATLAB: Passing data from GUI to .m file

Where you put, for example

k.name=get(hObject,'String')

in a callback, k there is just a local variable. As such it goes out of scope as soon as the callback completes.

What you need to do is attach this to the handles structure of the GUI, something more like:

handles.k.name = get( hObject, 'String' )
guidata( hObject, handles );

That last line is important to always include otherwise your changes to the handles structure will also be local to the callback function and lost after it completes.

Obviously you then also need to update your final callback equivalently:

ff=redesign( handles.k )

If you prefer you can ignore the text/edit box callbacks altogether and just collect up all the components from the UI under your pushbutton callback. That is often preferable if you do not need real time updating of the parameters in the underlying storage - i.e. if you are only going to use the values current at the time of clicking the pushbutton and don't care if the user changes their mind 27 times on what values they enter on the UI.

MATLAB: Jsonencode with containers.Map doesn’t preserve order of key value pairs

In the special case where all of the keys are valid variable names, you can convert the Map into a struct with field names in the order you desire; jsonencode() of the struct will then be the same as jsonencode of the Map except that you controlled the order.

containers.Map does have any idea what the right order is, and there is no way to force a particular ordering inside the Map. However, you can create another Map between an ordinal and associate key at the time you build the other Map; then you can values() the second Map to find the order to extract the values from the primary Map. You might want to use cell2struct to build the struct to pass to jsonencode.

Best Answer

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MATLAB: Passing data from GUI to .m file

MATLAB: Jsonencode with containers.Map doesn’t preserve order of key value pairs

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