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/* Copyright (c) 2011 The Chromium Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef PPAPI_C_PPB_MESSAGING_H_
#define PPAPI_C_PPB_MESSAGING_H_
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/pp_var.h"
#define PPB_MESSAGING_INTERFACE_0_1 "PPB_Messaging;0.1"
#define PPB_MESSAGING_INTERFACE PPB_MESSAGING_INTERFACE_0_1
/**
* @file
* This file defines the PPB_Messaging interface implemented by the browser.
* The PPB_Messaging interface contains pointers to functions related to
* sending messages to the JavaScript onmessage handler on the DOM element
* associated with a specific module instance.
*
* @addtogroup Interfaces
* @{
*/
/**
* The PPB_Messaging interface contains pointers to functions related to
* sending messages to the JavaScript onmessage handler on the DOM element
* associated with a specific module instance.
*/
struct PPB_Messaging {
/**
* @a PostMessage is a pointer to a function which asynchronously invokes the
* onmessage handler on the DOM element for the given module instance, if one
* exists. This means that a call to @a PostMessage will not block while the
* message is processed.
*
* @param message is a PP_Var containing the data to be sent to JavaScript.
* Currently, it can have an int32_t, double, bool, or string value (objects
* are not supported.)
*
* The onmessage handler in JavaScript code will receive an object conforming
* to the MessageEvent interface. In particular, the value of @a message will
* be contained as a property called @a data in the received MessageEvent.
* This is analogous to listening for messages from Web Workers.
*
* See:
* http://www.whatwg.org/specs/web-workers/current-work/
*
* For example:
*
* @verbatim
*
* <body>
* <object id="plugin"
* type="application/x-ppapi-postMessage-example"/>
* <script type="text/javascript">
* document.getElementById('plugin').onmessage = function(message) {
* alert(message.data);
* }
* </script>
* </body>
*
* @endverbatim
*
* If the module instance then invokes @a PostMessage() as follows:
* <code>
* char hello_world[] = "Hello world!";
* PP_Var hello_var = ppb_var_if->VarFromUtf8(instance,
* hello_world,
* sizeof(hello_world));
* ppb_messaging_if->PostMessage(instance, hello_var);
* </code>
*
* The browser will pop-up an alert saying "Hello world!".
*/
void (*PostMessage)(PP_Instance instance, struct PP_Var message);
};
/**
* @}
*/
#endif /* PPAPI_C_PPB_MESSAGING_H_ */
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