一起学libcef--源码文件介绍(VS2015运行DEMO)

昨天的博客《一起学libcef–开篇(下载、CMake的使用)》讲诉如何下载CEF，并如何得到对应vs版本的解决方案。

今天就展示一下，得到的工程文件夹中文件的作用。

include – 这个文件夹里面放CEF客户应用程序所需的头文件
libcef – 此文件夹存放CEF的静态库
libcef_dll – 此文件夹CEF的动态拉链库
tests – 此文件夹存放测试的例子
cefclient – 一个简单的客户程序
cefsimple–一个简单的例子
unittests – CEF界面单元测试

下面看一下：

下面就是运行cefsimple的界面了：

下面就是windows的入口函数：

#include <windows.h>

#include "cefsimple/simple_app.h"
#include "include/cef_sandbox_win.h"


// When generating projects with CMake the CEF_USE_SANDBOX value will be defined
// automatically if using the required compiler version. Pass -DUSE_SANDBOX=OFF
// to the CMake command-line to disable use of the sandbox.
// Uncomment this line to manually enable sandbox support.
// #define CEF_USE_SANDBOX 1

#if defined(CEF_USE_SANDBOX)
// The cef_sandbox.lib static library is currently built with VS2013. It may not
// link successfully with other VS versions.
#pragma comment(lib, "cef_sandbox.lib")
#endif


// Entry point function for all processes.
int APIENTRY wWinMain(HINSTANCE hInstance,
                      HINSTANCE hPrevInstance,
                      LPTSTR    lpCmdLine,
                      int       nCmdShow) {
  UNREFERENCED_PARAMETER(hPrevInstance);
  UNREFERENCED_PARAMETER(lpCmdLine);

  void* sandbox_info = NULL;

#if defined(CEF_USE_SANDBOX)
  // Manage the life span of the sandbox information object. This is necessary
  // for sandbox support on Windows. See cef_sandbox_win.h for complete details.
  CefScopedSandboxInfo scoped_sandbox;
  sandbox_info = scoped_sandbox.sandbox_info();
#endif

  // Provide CEF with command-line arguments.
  CefMainArgs main_args(hInstance);

  // SimpleApp implements application-level callbacks. It will create the first
  // browser instance in OnContextInitialized() after CEF has initialized.
  CefRefPtr<SimpleApp> app(new SimpleApp);

  // CEF applications have multiple sub-processes (render, plugin, GPU, etc)
  // that share the same executable. This function checks the command-line and,
  // if this is a sub-process, executes the appropriate logic.
  int exit_code = CefExecuteProcess(main_args, app.get(), sandbox_info);
  if (exit_code >= 0) {
    // The sub-process has completed so return here.
    return exit_code;
  }

  // Specify CEF global settings here.
  CefSettings settings;

#if !defined(CEF_USE_SANDBOX)
  settings.no_sandbox = true;
#endif

  // Initialize CEF.
  CefInitialize(main_args, settings, app.get(), sandbox_info);

  // Run the CEF message loop. This will block until CefQuitMessageLoop() is
  // called.
  CefRunMessageLoop();

  // Shut down CEF.
  CefShutdown();

  return 0;
}
Linux Entry Point
// cefsimple_linux.cpp
#include "cefsimple/simple_app.h"

#include <X11/Xlib.h>

#include "include/base/cef_logging.h"

namespace {

int XErrorHandlerImpl(Display *display, XErrorEvent *event) {
  LOG(WARNING)
        << "X error received: "
        << "type " << event->type << ", "
        << "serial " << event->serial << ", "
        << "error_code " << static_cast<int>(event->error_code) << ", "
        << "request_code " << static_cast<int>(event->request_code) << ", "
        << "minor_code " << static_cast<int>(event->minor_code);
  return 0;
}

int XIOErrorHandlerImpl(Display *display) {
  return 0;
}

}  // namespace


// Entry point function for all processes.
int main(int argc, char* argv[]) {
  // Provide CEF with command-line arguments.
  CefMainArgs main_args(argc, argv);

  // SimpleApp implements application-level callbacks. It will create the first
  // browser instance in OnContextInitialized() after CEF has initialized.
  CefRefPtr<SimpleApp> app(new SimpleApp);

  // CEF applications have multiple sub-processes (render, plugin, GPU, etc)
  // that share the same executable. This function checks the command-line and,
  // if this is a sub-process, executes the appropriate logic.
  int exit_code = CefExecuteProcess(main_args, app.get(), NULL);
  if (exit_code >= 0) {
    // The sub-process has completed so return here.
    return exit_code;
  }

  // Specify CEF global settings here.
  CefSettings settings;

  // Install xlib error handlers so that the application won't be terminated
  // on non-fatal errors.
  XSetErrorHandler(XErrorHandlerImpl);
  XSetIOErrorHandler(XIOErrorHandlerImpl);

  // Initialize CEF for the browser process.
  CefInitialize(main_args, settings, app.get(), NULL);

  // Run the CEF message loop. This will block until CefQuitMessageLoop() is
  // called.
  CefRunMessageLoop();

  // Shut down CEF.
  CefShutdown();

  return 0;
}

既然源码可以运行了，我们就可以学习了。
但是源码过于庞大，我们不想太深入理解的话，就想着如何在自己的程序中使用libcef.dll这个库，这就是接下来要讨论的内容。