How do I convert a JSON string back to a C2 array?

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  • I have my string, json_encode'd from PHP. It looks like this.

    [{"Name":"Alford County","League":"Watnall Premier","ID":1},{"Name":"Highbridge County","League":"Watnall Premier","ID":3}]

    That's 2 rows, with 3 values each. I want to break it down into a usable form in C2. I was thinking that I could just plonk it into an array with Array -> Load From JSON string but I get nothing in my array when I do that.

    I thought there was something to do this automatically, but maybe I'm imagining it. Will I need to break the string down myself with 'tokenat' etc?

  • Thanks, that looks really useful in a lot of areas.

    I assume though that this means that you can't do what I'm asking, without a plugin? It can't be done directly from C2?

  • If Ajax received this string

    [{"Name":"Alford County","League":"Watnall Premier","ID":1},{"Name":"Highbridge County","League":"Watnall Premier","ID":3}][/code:6ivnj7lg]I think,not...
to set  Array  directly from Json...you need something like :

[code:6ivnj7lg]{"c2array":true,"size":[2,3,1],"data":[[["Alford County"],["Watnall Premier"],[1]],[["Highbridge County"],["Watnall Premier"],[3]]]}[/code:6ivnj7lg]

..but I could be wrong

  • Yes, I think you're right. I'll try the plugin or use my own methods for sending / splitting data. Thanks.

  • I had to write a Java object to convert from Java arrays into Construct-friendly JSON.

    This is my half-way solution (it only converts to a one-dimensional Width-based C2 array):

    public class C2 {
	//-------------------------------------------------------------------------------------------------------------------
	// Method to output Construct-compatible JSON Array structures
	//-------------------------------------------------------------------------------------------------------------------
	public static String outputToC2Array(ArrayList<String> list){
		
		StringBuilder sb = new StringBuilder("");
		try{
			if(list!=null && list.size()>0){
				sb.append("{\\\"c2array\\\":true,\\\"size\\\":[" + list.size() + ",1,1],\\\"data\\\":[");
				
				for(int i=0 ; i < list.size() ; i++){
					sb.append("[[" + list.get(i) + "]]");
					if(i < list.size() - 1) sb.append(","); //skips the last comma
				}				
				sb.append("]}");
			}
			return sb.toString().replaceAll("\\\\\"", "\"");
		} finally {
			sb = null;
		}
	}
	//-------------------------------------------------------------------------------------------------------------------
	// Method to reconstruct arrays from Construct-compatible JSON strings
	//-------------------------------------------------------------------------------------------------------------------
	public static ArrayList<String> arrayFromC2jsonString(String c2json){
		ArrayList<String> returnList = new ArrayList<String>();
		try{
			if(c2json.contains("data\":")){
				String subS = c2json.substring(c2json.indexOf("data\":", 0)+9, c2json.length()-4);
				String[] pieces = subS.split("\\]\\],\[\[");
				for(String piece : pieces){
					returnList.add(piece);
				}
			}
			return returnList;
		}finally{
			returnList = null;
		}
	}
}
[/code:cwm5su9d]

Basically, I just parse the array into a C2-friendly JSON string.

  • That's a thought, doing it at the PHP end, instead of breaking it up at the C2 end. Mind you, I'm FAR more comfortable with BASIC in C2 than I am in PHP. I find myself spending 15 minutes on just about EVERY command in PHP because I'm so unfamiliar with the syntax.

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  • Yea, but PHP has StackOverflow at it's back.

  • Some sample code from one of my applications that does exactly this :-

    // Reformat hiscores into C2 compatible format
$cnt = 1;
$cnt = count($hiscores);
for ($i = 0; $i < $cnt; $i++) {
      $scores[$i][0][0] = $hiscores [$i];
}

$content->c2array = "true";
$content->data = $scores;
$content->size[0] = $cnt;
$content->size[1] = 1;
$content->size[2] = 1;

$encoded_content = json_encode($content);
[/code:2sx2hb05]

I've tried to remove any code specific to my application.
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