EPadLink ePad Vision Bedienungsanleitung PDF herunterladen (Seite 11)

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

7.3.2 – Linux

Below is the Linux version of com.topaz.epadvision.win.json, distributed along with the SDK and it can

be used. Some of the parameters of the file will be changed based on the target machine.

{

"name": "com.topaz.epadvision.win",

"description": "Chrome ePad-vision SDK Native Messaging Host",

“path":"/usr/share/ePad/Chrome_extension/SDK/Chrome_NativeMessagingHost/ePadvisionNMHost.exe",

"type": "stdio",

"allowed_origins": [

"chrome-extension://mcjlhkcioghfmodbaapbhgagdcgehmfg/"

]

}

The path field is set to the location where the ePadvisionNMHost.exe located.

7.4 – Integrating the native messaging host into applications

The native messaging host can be integrated directly into an extension or web page.

Integration into a web page requires a background extension that acts as a bridge between the

web page and the native messaging host application.

All the APIs required for launching the host, sending messages to the host, and receiving

messages from the host are available in Chrome JavaScript.

Note: The Chrome Native Messaging related JavaScript APIs cannot be accessed directly

from a web page. For security reasons, Chrome allows only an extension to access the native

messaging hosts.

7.5 – Launching the native messaging host

Within the extension JavaScript, the following code can be used to launch the native

messaging host application.

var hostName = "com.topaz.epadvision.win";

port = chrome.runtime.connectNative(hostName);

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

port.onMessage.addListener(on

NativeMessage);

// Register the listener to handle native messaging host disconnect or closed.

port.onDisconnect.addListener(onDisconnected);

7.6 – ePad-vision device access

The ePad-vision SDK for Chrome is implemented as a Native Messaging Host. As the Google Native

Messaging API framework mandates using Standard Input and Output streams for communication

between the Chrome and the native application, only text data can be exchanged between the

applications. The Input messages trigger communication with device, and the input message itself

contains all the required data as payload.

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EPadLink ePad Vision Bedienungsanleitung Seite 11