How to share variables across Matlab App Designer Apps

Question

Luis Davila 2021-7-26

0
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https://ww2.mathworks.cn/matlabcentral/answers/886524-how-to-share-variables-across-matlab-app-designer-apps

回答： Swetha Polemoni 2021-7-29

I have 2 apps, the first app is the main screen from which all functions are performed. The MainScreen app has 1 parameter named " QueryResult" and is coded in the following way.

    properties (Access = public)
        QueryResult table % Description
    end

The MainScreen app also has a button that opens the second app. The second app is the 'advanced search' screen where a user can perform a search and get a table. The table in question is 1x24 and stored in the variable "data". I tried storing the found table into the MainScreen property like so:

        data = fetch(conn,query);
        MainScreen.QueryResult = data;
        

If I then access the QueryResult property and print it from the AdvancedSearch app I get the expected result.

    display(MainScreen.QueryResult)
    _______________________________________________________________________________________________________
    subjectid      gender      birthdate      genotype        age           cage         health      sessionnumber    tasktypesuggested    tasktypeactuallydone    costvalue     certaintycost    costprobability    certaintyvalue    certaintyreward    rewardvalue    rewardprobability     firstday      lastday        reason      rewardintensity       cost       probabilityreward      notes
    _________    __________    __________    __________    __________    __________    __________    _____________    _________________    ____________________    __________    _____________    _______________    ______________    _______________    ___________    _________________    __________    __________    __________    _______________    __________    _________________    __________
    {'tony'}     {0×0 char}    {0×0 char}    {0×0 char}    {0×0 char}    {0×0 char}    {0×0 char}     {0×0 char}         {0×0 char}             {0×0 char}         {0×0 char}     {0×0 char}        {0×0 char}         {0×0 char}        {0×0 char}       {0×0 char}        {0×0 char}        {0×0 char}    {0×0 char}    {0×0 char}      {0×0 char}       {0×0 char}       {0×0 char}        {0×0 char}

However if I go back into the MainScreen app and try to access the property from within, it is empty and trying to display it results in a 0x0 table. I have no idea what the problem is, and where the fault is occuring. I'd be very appreciative to anyone who could offer answers.

display(app.QueryResult)
______________________________________________________________________________________________________
  __________   
   {0×0 char}