GPGS Snapshot Retrieval

Solar2D Game Networking
#1

So i have gpgs working in my current game and everything is fine i can save data to the server and when i check to make sure it’s there it is… but my problem is reading the data back. I opened the snapshot and then when i try to read the snapshot objects contents with object:read() i get nothing? What format is it in? I’ve tried everything i can think of and it’s not nil so i have no idea where the data is. It should be as simple as

local data = object:read()

Right? Or am I missing something? I even tried decoding it like it was a json.

Anyone have a solution to this?

#2

Anyone? The documentation doesn’t specify what type of data the “payload” is. Is there somewhere else i can go for answers? These forums seem dead.

#3

What specific API’s are you trying to use? I don’t see a :read() API under GPGS’s plugin docs.

Rob

#4

https://docs.coronalabs.com/plugin/gpgs/snapshots/type/Snapshot/index.html

Under object.contents

It creates a snapshotcontents object and then you can read or modify the data

https://docs.coronalabs.com/plugin/gpgs/snapshots/type/SnapshotContents/index.html

But it never says what the “payload” is. I’ve tried everything but i can’t read the data i’ve saved.

#5

Before you can call the .read() method, it’s expected that you would have already called the .write() method at some point. The API documentation says that .write() expects a string value.  No numbers, no tables, no booleans. Obviously you would like to store things other than strings like a table of data and that’s where the JSON library comes into play.

json.encode( someTable) returns a string that represents that table in a standard format. You can use the json.* library to convert the table to a string and then when reading convert it back to a table:

object.write( json.encode( yourTableToSave ) )

Then to get it back:

myTable = json.decode( object.read() )

Does that help?

Rob

#6

Thanks! I’m sure this will lead me in the direction i need. I’ll update with my results when i get it finished.

#7

Sigh…a capital letter…all this fuss over a capital letter. I was doing it right the whole time lol. Thanks for the response :slight_smile:

#8

Hi 

I am a bit late to this topic. My question is that if  I already have a gameInfo.json can I directly use event.snapshot.contents.write( gameInfo.json ) ?

I am using local loadsave = require(" loadsave") by Rob Miracle to save my game data as gameInfo.json. 

#9

The same JSON will work. The loadsave functionality hides your need to have access to the JSON file. You give it a table, you get a table. But I suppose you could either 

  1. read the saved file back in like load does and instead of converting it to a Lua table, just save the read data in it’s JSON form. JSON is just a big string that represents your table.

  2. Just use json.encode( yourTable ) as the value to GPGS.

  3. Modify your loadsave functions to also write the JSON string to GPGS at the same time it saves it to a local file.

Rob

#10

@Rob. Thank you for the insight. I am going with option 2. Can you please have a look at this post (GPGS new plugin implementation basics) regarding the GPGS new plugin. I have implemented option 2 if you could please check whether it is correct or not.

 

#11

Have you tried it?

Are you having problems?

Rob

#12

@Rob

I haven’t tried testing it yet since I am having other issues with login. I have posted the code in another postsince it was not related to this post. If you could please have a look at there it would be a great help to me. 

Thank you :slight_smile:

#13

Anyone? The documentation doesn’t specify what type of data the “payload” is. Is there somewhere else i can go for answers? These forums seem dead.

#14

What specific API’s are you trying to use? I don’t see a :read() API under GPGS’s plugin docs.

Rob

#15

https://docs.coronalabs.com/plugin/gpgs/snapshots/type/Snapshot/index.html

Under object.contents

It creates a snapshotcontents object and then you can read or modify the data

https://docs.coronalabs.com/plugin/gpgs/snapshots/type/SnapshotContents/index.html

But it never says what the “payload” is. I’ve tried everything but i can’t read the data i’ve saved.

#16

Before you can call the .read() method, it’s expected that you would have already called the .write() method at some point. The API documentation says that .write() expects a string value.  No numbers, no tables, no booleans. Obviously you would like to store things other than strings like a table of data and that’s where the JSON library comes into play.

json.encode( someTable) returns a string that represents that table in a standard format. You can use the json.* library to convert the table to a string and then when reading convert it back to a table:

object.write( json.encode( yourTableToSave ) )

Then to get it back:

myTable = json.decode( object.read() )

Does that help?

Rob

#17

Thanks! I’m sure this will lead me in the direction i need. I’ll update with my results when i get it finished.

#18

Sigh…a capital letter…all this fuss over a capital letter. I was doing it right the whole time lol. Thanks for the response :slight_smile:

#19

Hi 

I am a bit late to this topic. My question is that if  I already have a gameInfo.json can I directly use event.snapshot.contents.write( gameInfo.json ) ?

I am using local loadsave = require(" loadsave") by Rob Miracle to save my game data as gameInfo.json. 

#20

The same JSON will work. The loadsave functionality hides your need to have access to the JSON file. You give it a table, you get a table. But I suppose you could either 

  1. read the saved file back in like load does and instead of converting it to a Lua table, just save the read data in it’s JSON form. JSON is just a big string that represents your table.

  2. Just use json.encode( yourTable ) as the value to GPGS.

  3. Modify your loadsave functions to also write the JSON string to GPGS at the same time it saves it to a local file.

Rob