B4J Question Access to a Type structure by Code?

Discussion in 'B4J Questions' started by MarkusR, Sep 4, 2018.

  1. MarkusR

    MarkusR Well-Known Member Licensed User

    if me have a Type structure.
    is it possible to get the fields and datatype from within source code?

    me thought about to generate a input form from it automatically.
  2. Daestrum

    Daestrum Well-Known Member Licensed User

    yes - small example (uses JavaObject library)

    Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Type myType(name As String,age As Int,height As Int)
    End Sub
    Sub AppStart (Form1 As Form, Args() As String)
     MainForm = Form1
    Dim a As myType
    ' the next line calls the getFields method in the #if java block
    ' it passes the class of the type (type is a class) 
     Log(asJO(Me).RunMethod("getFields",Array(asJO(a).RunMethod("getClass",Null))))  ' call the inline function
    End Sub

    Sub asJO(o As JavaObject)As JavaObject
    Return o
    End Sub

    'Return true to allow the default exceptions handler to handle the uncaught exception.
    Sub Application_Error (Error As Exception, StackTrace As StringAs Boolean
    Return True
    End Sub

    #if java
    import java.lang.reflect.Field;
    public static String getFields(Class c){
     String fs = "";
     Field[] f = c.getDeclaredFields();
     for (Field ff : f){
      fs += ff.getName().toString()+"\t";
      fs += ff.getType().getSimpleName().toString()+"\n\n";
     return fs;
    #End If
    Mashiane and MarkusR like this.
  3. Erel

    Erel Administrator Staff Member Licensed User

    MarkusR likes this.
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