EPadLink ePad Vision Manual de usuario descargar pdf (Pagina 12)

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Integration Guide (ePad-vision SDK for Chrome & Firefox)

The Output message payload contains the status of the transaction and also signature points, widget

events, etc.

The Native Messaging framework mandates that the input and output messages should be in JSON

format. Native messaging allows you to send multiple attributes as part of the JSON string/message.

The format of the JSON message is

{text: value1, text1: value2}

where ‘text’ and ‘text1’ are the names of the JSON parameters.

The value1and value2 entries are the values in JSON format. These will be used by the native host

application to interpret the signature capture input and process it accordingly. There are no practical

restrictions on the number of parameters, names of the parameters, or the length of the data any

parameter can contain.

Sending input messages to the Native Messaging host.

Chrome API postMessage should be used to send input messages to the Native Messaging Host

message = { "command": 1, "inking": false, "inkRegionx": 0, "inkRegiony": 0, "inkRegionWidth": 0, "inkRegionHeight": 0,

"widgetLayout": confirmXml };

port.postMessage(message);

Receiving output messages

// Register the listener to handle output messages from native messaging host.

port.onMessage.addListener(onNativeMessage);

// Receiving response from Native Host (onNativeMessage Event)

function onNativeMessage(message) {

console.log("onNativeMessage : " + message);

// Write logic to handle the messages received

}

Once an Input message is sent, the Native Messaging Host processes the request and sends

back the status asynchronously to the extension by firing the callback function registered.

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EPadLink ePad Vision Manual de usuario Pagina 12