CEF加载PPAPI插件-CEF与PPAPI开发

CEF基于Chromium和Webkit而来，支持PPAPI和NaCI。

CEF3的binary包默认已经支持PPAPI(参考http://magpcss.org/ceforum/viewtopic.php?f=10&t=10509），以cefsimple为例（参考CEF Windows开发环境搭建），可以通过命令行参数来注册PPAPI plugin，通过–url参数传递一个加载对应plugin的html页面。

下面是我测试可用的一个命令行参数

--ppapi-out-of-process --register-pepper-plugins="D:projectscef_binary_3.2357.1271.g8e0674e_windows32Releasestub.dll;application/x-ppapi-stub" --url=file:///d:/projects/cef_binary_3.2357.1271.g8e0674e_windows32/Release/stub.html

stub.html非常简单，代码如下：

<!DOCTYPE html>
<html>
<head>
  <title>stub</title>
</head>

<body>

<embed id="plugin" type="application/x-ppapi-stub">

</body>
</html>

其中stub.dll是我编译的PPAPI SDK里的示例，做了些许改动。stub.c代码如下：

// Copyright (c) 2010 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.

// This is the simplest possible C Pepper plugin that does nothing. If you"re
// using C++, you will want to look at stub.cc which uses the more convenient
// C++ wrappers.

#include <stddef.h>
#include <stdint.h>
#include <Windows.h>
#include <tchar.h>

#include "ppapi/c/pp_errors.h"
#include "ppapi/c/pp_module.h"
#include "ppapi/c/ppb.h"
#include "ppapi/c/ppp.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/ppp_instance.h"

PP_Module g_module_id;
PPB_GetInterface g_get_browser_interface = NULL;

PP_EXPORT int32_t PPP_InitializeModule(PP_Module module_id,
   PPB_GetInterface get_browser_interface) {
  // Save the global module information for later.
  g_module_id = module_id;
  g_get_browser_interface = get_browser_interface;
  OutputDebugString(_T("PPP_InitializeModule was called
"));

  return PP_OK;
}

PP_EXPORT void PPP_ShutdownModule() {
OutputDebugString(_T("PPP_ShutdownModule was called
"));
}

PP_EXPORT const void* PPP_GetInterface(const char* interface_name) {
  // You will normally implement a getter for at least PPP_INSTANCE_INTERFACE
  // here.
  return NULL;
}

如你所见，我只是使用OutputDebugString函数输出了调试信息。运行cefsimple，使用DbgView工具可以看到我们输出的信息。

关于PPAPI插件的细节，后面会有一些文章来讲。