Android Question Automatic mapping of type fields and variables

NJDude

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• Aug 15, 2014

• #2

You will have to parse the JSON response and assign the values to the variables as you parse.

 

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bluedude

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• Aug 16, 2014

• #3

Not exactly what I mean, parsing and assigning variables is not the problem. I want to get the fields from json too and say newRecord.fieldvariable

So instead of saying :

newRecord.address = "test" I want to do

newRecord.fieldvariable="test" where fieldvariable is address which I got from the json file.

So basically i'm getting the type property from the json. If this is possible it would be easier because I don't need to do select case statements etc.

 

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DonManfred

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• Aug 16, 2014

• #4

See jsontree to get the right code to "read and parse" the jsonstring in b4a

 

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bluedude

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• Aug 16, 2014

• #5

Sorry guys, this is not about json parsing!

It is about mapping a variable name that is in json to for example a property of a view or a property of a defined type. See my sample in this question. So basically the property name is what I get from JSON.

I don't want to do:

if json fieldname = "address" then
newRecord.address = json fieldname value

I want to do newRecord.jsonfieldname= "test"

I have no other way to explain this better unfortunately.

 

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keirS

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• Aug 16, 2014

• #6

Sort of. You can use CallSub3 to do this:

B4X:

CallSub3("","Set" & json.fieldname,newRecord,  json.fieldname.value)

Sub Setaddress(setRecord as record, address as string)
  setRecord.address = address
End sub

 

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bluedude

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• Aug 17, 2014

• #7

Again, not the point The whole thing is to do the .address assignment by using a variable instead of saying it is the address property.

I want to loop through the json which has all the field names defined in my type. Then I want to do fieldname = json fieldname and then newRecord.fieldname

In this case fieldname is a variable defined as string.

 

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keirS

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• Aug 17, 2014

• #8

Yes I know. But AFAIK B4A doesn't do macro substitution or have an Eval function like JavaScript. Only interpreted languages support those features usually.

 

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Erel

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• Aug 17, 2014

• #9

Mapping the fields to a custom type fields will require you to manually implement it. However you can use a Map instead of the custom type.

 

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