Android Question parse a JSON string

[Elton Leung]

Dear all,

I am trying to convert a piece of javascript I created to B4A. The javascript extract two or three variable from a JSON string which is returned from a web API.

Because of the format of the JSON string is already known, I am able to use several lines to get what I needed:

var face = JSON.parse(JSONstring));
var width = face.photos[0].width;
var height = face.photos[0].height;

Can I do that with B4A? or I have to navigate throw the string level by level to get what I needed?

Here is the JSON string:

{"status":"success","photos":[{"url":"http://api.skybiometry.com/fc/images/get?id=XmN2X3hybD1ucTQ1NnBwMDMyNnM0cm5xbnE0NjBzOXJzNXI3bzZuMSZuY3ZfZnJwZXJnPXNxNjQ1cDUzMTg5ODQ5N285MDM1NjYybzhxbzJzbjk0JmVxPTI2MzkmY3ZxPXNvbjNxNnE3NDcxNnEmZ3Z6cmZnbnpjPTIwMTUwOTIxMDQ1NjI0","pid":"F@0c84ad51083a3de25642d1351d5e1f0e_fba3d6d74716d","width":1280,"height":720,"tags":[{"uids":[],"label":null,"confirmed":false,"manual":false,"width":21.64,"height":38.47,"yaw":-1,"roll":91,"pitch":0,"attributes":{"face":{"value":"true","confidence":71}},"points":null,"similarities":null,"tid":"TEMP_F@0c84ad51083a3de25642d135020e01d4_fba3d6d74716d_41.09_65.00_0_1","recognizable":true,"center":{"x":41.09,"y":65.0},"eye_left":{"x":45.7,"y":75.56,"confidence":59,"id":449},"eye_right":{"x":46.17,"y":55.14,"confidence":61,"id":450},"mouth_center":{"x":33.44,"y":64.86,"confidence":56,"id":615},"nose":{"x":39.92,"y":65.69,"confidence":58,"id":403}}]}],"usage":{"used":1,"remaining":99,"limit":100,"reset_time":1442807935,"reset_time_text":"Mon, 21 September 2015 03:58:55 +0000"},"operation_id":"f779562c340d4517a7e253af6b88f5ae"

thank you for your help.

 

[Erel]

Yes. Of course.

You can use this tool: http://b4x.com:51042/json/index.html

Tutorial: https://www.b4x.com/android/forum/threads/6923

 

[Elton Leung]

Hi Erel,

Thank you for your prompt reply. I have been reading the tool and link that you sent me. This is why I have the impression that with B4A, I must use the .GET function to go down from one level to the one below and repeat the process in order to get information that is lower and that's why I start this thread.

    m = Map1.Get("photos")
    m = m.Get("popup")
    MenuItems = m.Get("menuitem")

vs

var eye_left_x = face.photos[0].tags[0].eye_left.x; << from my old javascript code
Which is much more direct.

My question should be, how can I do the same thing in B4A in one line?

 

[Erel]

You will need to write these three lines.

 

[Elton Leung]

Thanks. Can you kindly give a hand on how I can get these three items "width":1280 , "eye_left":{"x":45.7,"y":75.56

I have been trying different way of getting them from the JSON string but all I get is pause at the IDE.

{"status":"success","photos":[{"url":"http://api.skybiometry.com/fc/images/get?id=bmN2X3hybD1ucTQ1NnBwMDMyNnM0cm5xbnE0NjBzOXJzNXI3bzZuMSZuY3ZfZnJwZXJnPXNxNjQ1cDUzMTg5ODQ5N285MDM1NjYybzhxbzJzbjk0JmVxPTI2MzkmY3ZxPXNvbjNxNnE3NDcxNnEmZ3Z6cmZnbnpjPTIwMTUwOTIxMDQ1NjI0","pid":"F@0c84ad51083a3de25642d1351d5e1f0e_fba3d6d74716d","width":1280,"height":720,"tags":[{"uids":[],"label":null,"confirmed":false,"manual":false,"width":21.64,"height":38.47,"yaw":-1,"roll":91,"pitch":0,"attributes":{"face":{"value":"true","confidence":71}},"points":null,"similarities":null,"tid":"TEMP_F@0c84ad51083a3de25642d135020e01d4_fba3d6d74716d_41.09_65.00_0_1","recognizable":true,"center":{"x":41.09,"y":65.0},"eye_left":{"x":45.7,"y":75.56,"confidence":59,"id":449},"eye_right":{"x":46.17,"y":55.14,"confidence":61,"id":450},"mouth_center":{"x":33.44,"y":64.86,"confidence":56,"id":615},"nose":{"x":39.92,"y":65.69,"confidence":58,"id":403}}]}],"usage":{"used":1,"remaining":99,"limit":100,"reset_time":1442807935,"reset_time_text":"Mon, 21 September 2015 03:58:55 +0000"},"operation_id":"f779562c340d4517a7e253af6b88f5ae"}

 

[inakigarm]

If you try the online JSON parser http://b4x.com:51042/json/index.html, it will show you the needed code

If you had tried before and have any problems with your code, please attach your code and logs

 

[Elton Leung]

If you try the online JSON parser http://b4x.com:51042/json/index.html, it will show you the needed code

If you had tried before and have any problems with your code, please attach your code and logs

wow, that parser is special one specially for B4A, I thought it just just another online parser. Thanks !!!!

 

[DonManfred]

specially for B4A

AFAIK not just b4a; it´s for b4x i believe. The generated code will work for B4A, B4J and i think B4i too.

 

[Erel]

The code for the online service is available here: https://www.b4x.com/android/forum/threads/server-online-json-tree-example.39048/#content