load_from_stream_async


Description:

[ Version ( since = "0.12" ) ]
public async bool load_from_stream_async (InputStream stream, Cancellable? cancellable = null) throws Error

Asynchronously reads the contents of a stream.

For more details, see [method@Json.Parser.load_from_stream], which is the synchronous version of this call.

When the operation is finished, callback will be called. You should then call [method@Json.Parser.load_from_stream_finish] to get the result of the operation.

Example: Parser example (Stream, async):

public static int main (string[] args) {
if (args.length < 2) {
print ("Usage: test <filename.json>\n");
return -1;
}

MainLoop loop = new MainLoop ();

// Load a file:
File file = File.new_for_commandline_arg (args[1]);
file.read_async.begin (Priority.DEFAULT, null, (obj, res) => {
try {
FileInputStream stream = file.read_async.end (res);

Json.Parser parser = new Json.Parser ();
parser.load_from_stream_async.begin (stream, null, (obj, res) => {
try {
parser.load_from_stream_async.end (res);

// Get the root node:
Json.Node node = parser.get_root ();

// manipulate/read the object tree and then exit
// ...

node = null;
} catch (Error e) {
print ("Unable to parse `%s': %s\n", args[1], e.message);
}

loop.quit ();
});
} catch (Error e) {
print ("Error: Can't read file: %s\n", e.message);
loop.quit ();
}
});

loop.run ();
return 0;
}

valac --pkg json-glib-1.0 parser-example-stream-async.vala

Parameters:

this

a parser

stream

the input stream with the JSON data

cancellable

a Cancellable

callback

the function to call when the request is satisfied

user_data

the data to pass to callback