chrome/app/client_util.h

   1 // Copyright (c) 2012 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 // This file defines utility functions that can report details about the
   6 // host operating environment.
   7
   8 #ifndef CHROME_APP_CLIENT_UTIL_H_
   9 #define CHROME_APP_CLIENT_UTIL_H_
  10
  11 #include <windows.h>
  12
  13 #include "base/strings/string16.h"
  14
  15 namespace sandbox {
  16   struct SandboxInterfaceInfo;
  17 }
  18
  19 // Gets the path of the current exe with a trailing backslash.
  20 base::string16 GetExecutablePath();
  21
  22 // Returns the version in the current module's version resource or the empty
  23 // string if none found.
  24 base::string16 GetCurrentModuleVersion();
  25
  26 // Implements the common aspects of loading chrome.dll for both chrome and
  27 // chromium scenarios, which are in charge of implementing two abstract
  28 // methods: GetRegistryPath() and OnBeforeLaunch().
  29 class MainDllLoader {
  30  public:
  31   MainDllLoader();
  32   virtual ~MainDllLoader();
  33
  34   // Loads and calls the entry point of chrome.dll. |instance| is the exe
  35   // instance retrieved from wWinMain and the |sbox_info| is the broker or
  36   // target services interface pointer.
  37   // The return value is what the main entry point of chrome.dll returns
  38   // upon termination.
  39   int Launch(HINSTANCE instance, sandbox::SandboxInterfaceInfo* sbox_info);
  40
  41   // Launches a new instance of the browser if the current instance in
  42   // persistent mode an upgrade is detected.
  43   void RelaunchChromeBrowserWithNewCommandLineIfNeeded();
  44
  45   // Called after chrome.dll has been loaded but before the entry point
  46   // is invoked. Derived classes can implement custom actions here.
  47   // |dll_path| refers to the path of the Chrome dll being loaded.
  48   virtual void OnBeforeLaunch(const base::string16& dll_path) {}
  49
  50   // Called after the chrome.dll entry point returns and before terminating
  51   // this process. The return value will be used as the process return code.
  52   // |dll_path| refers to the path of the Chrome dll being loaded.
  53   virtual int OnBeforeExit(int return_code, const base::string16& dll_path) {
  54     return return_code;
  55   }
  56
  57  protected:
  58   // Derived classes must return the relative registry path that holds the
  59   // most current version of chrome.dll.
  60   virtual base::string16 GetRegistryPath() = 0;
  61
  62   HMODULE Load(base::string16* out_version, base::string16* out_file);
  63
  64  private:
  65   // Chrome.dll handle.
  66   HMODULE dll_;
  67 };
  68
  69 // Factory for the MainDllLoader. Caller owns the pointer and should call
  70 // delete to free it.
  71 MainDllLoader* MakeMainDllLoader();
  72
  73 #endif  // CHROME_APP_CLIENT_UTIL_H_