Chromium Blog
News and developments from the open source browser project
Connecting Chrome apps and extensions with native applications
2013年10月15日火曜日
We
recently announced
the deprecation of
NPAPI
plug-in support in Chrome. One of the main use cases for NPAPI plugins in Chrome apps and extensions was to connect with native applications installed on the same computer. For example, a native password management application that a user has already installed on the system may want to connect with a Chrome extension to synchronize passwords. To support such use cases without the need for NPAPI, we’ve recently added the
Native Messaging API
.
To use this API, native applications must register a native messaging host that Chrome apps and extensions can connect to. This is done by installing a
special manifest file
that defines a name and path to the native messaging host binary, as well as set of app and extension IDs that can connect to it. Once a native messaging host manifest is installed, Chrome apps and extensions can connect to it using simple API:
var port = chrome.extension.connectNative( "org.chromium.native_messaging_example");
The parameter passed to
chrome.extension.connectNative()
is the name used to identify the native messaging host. When a native messaging port is created Chrome starts the host in a separate process and communicates with it over the standard input and output streams. The app or extension can send and receive messages from the native application using this simple API:
// Register handler for incoming messages.
port.onMessage.addListener(function(msg) {
console.log("Received " + msg);
});
// Send a message.
port.postMessage({text: "Hello!"})
It's also possible to send one-off messages without creating a port:
chrome.extension.sendNativeMessage(
"org.chromium.native_messaging_example",
{messageField: "field value"},
function(response) {
console.log("Received response" + response);
});
For details on how to create and register a native messaging host please refer to the
API documentation
and check out our
sample application
, which also includes a simple native messaging host.
The Native Messaging API is available on Windows, OS X and Linux starting from Chrome 29. To learn about other NPAPI alternatives, check out the
NPAPI deprecation Chromium wiki page
.
Posted by Sergey Ulanov, Software Engineer and Message Dispatcher
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