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      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 <string>
     14 #include "base/strings/string16.h"
     15 
     16 namespace sandbox {
     17   struct SandboxInterfaceInfo;
     18 }
     19 
     20 // Gets the path of the current exe with a trailing backslash.
     21 base::string16 GetExecutablePath();
     22 
     23 // Returns the version in the current module's version resource or the empty
     24 // string if none found.
     25 base::string16 GetCurrentModuleVersion();
     26 
     27 // Implements the common aspects of loading the main dll for both chrome and
     28 // chromium scenarios, which are in charge of implementing two abstract
     29 // methods: GetRegistryPath() and OnBeforeLaunch().
     30 class MainDllLoader {
     31  public:
     32   MainDllLoader();
     33   virtual ~MainDllLoader();
     34 
     35   // Loads and calls the entry point of chrome.dll. |instance| is the exe
     36   // instance retrieved from wWinMain.
     37   // The return value is what the main entry point of chrome.dll returns
     38   // upon termination.
     39   int Launch(HINSTANCE instance);
     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  protected:
     46   // Called after chrome.dll has been loaded but before the entry point
     47   // is invoked. Derived classes can implement custom actions here.
     48   // |dll_path| refers to the path of the Chrome dll being loaded.
     49   virtual void OnBeforeLaunch(const base::string16& dll_path) = 0;
     50 
     51   // Called after the chrome.dll entry point returns and before terminating
     52   // this process. The return value will be used as the process return code.
     53   // |dll_path| refers to the path of the Chrome dll being loaded.
     54   virtual int OnBeforeExit(int return_code, const base::string16& dll_path) = 0;
     55 
     56  private:
     57   HMODULE Load(base::string16* version, base::string16* out_file);
     58 
     59  private:
     60   HMODULE dll_;
     61   std::string process_type_;
     62   const bool metro_mode_;
     63 };
     64 
     65 // Factory for the MainDllLoader. Caller owns the pointer and should call
     66 // delete to free it.
     67 MainDllLoader* MakeMainDllLoader();
     68 
     69 #endif  // CHROME_APP_CLIENT_UTIL_H_
     70