native_client_sdk/src/getting_started/part2/hello_tutorial.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ppapi/cpp/instance.h"
   6 #include "ppapi/cpp/module.h"
   7 #include "ppapi/cpp/var.h"
   8
   9 namespace {
  10
  11 // The expected string sent by the browser.
  12 const char* const kHelloString = "hello";
  13 // The string sent back to the browser upon receipt of a message
  14 // containing "hello".
  15 const char* const kReplyString = "hello from NaCl";
  16
  17 }  // namespace
  18
  19 class HelloTutorialInstance : public pp::Instance {
  20  public:
  21   explicit HelloTutorialInstance(PP_Instance instance)
  22       : pp::Instance(instance) {}
  23   virtual ~HelloTutorialInstance() {}
  24
  25   virtual void HandleMessage(const pp::Var& var_message) {
  26     // Ignore the message if it is not a string.
  27     if (!var_message.is_string())
  28       return;
  29
  30     // Get the string message and compare it to "hello".
  31     std::string message = var_message.AsString();
  32     if (message == kHelloString) {
  33       // If it matches, send our response back to JavaScript.
  34       pp::Var var_reply(kReplyString);
  35       PostMessage(var_reply);
  36     }
  37   }
  38 };
  39
  40 class HelloTutorialModule : public pp::Module {
  41  public:
  42   HelloTutorialModule() : pp::Module() {}
  43   virtual ~HelloTutorialModule() {}
  44
  45   virtual pp::Instance* CreateInstance(PP_Instance instance) {
  46     return new HelloTutorialInstance(instance);
  47   }
  48 };
  49
  50 namespace pp {
  51
  52 Module* CreateModule() {
  53   return new HelloTutorialModule();
  54 }
  55
  56 }  // namespace pp