cef --类与接口介绍

2年前 (2022) 程序员胖胖胖虎阿

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应用程序结构

每个CEF3应用程序都有一个相同的结构：

提供一个入口函数以初始化CEF和运行每个子进程逻辑和CEF消息处理
提供一个CefApp子类处理某个进程的回调
提供一个CefClinet子类处理某个浏览进程的回调
调用CefBrowserHost::CreateBrowser()函数创建浏览进程实例并使用CefLifeSpanHandler来管- 理浏览生命周期

typedef struct _cef_settings_t {
  ///
  // Size of this structure.
  ///
  size_t size;

  ///
  // Set to true (1) to use a single process for the browser and renderer. This
  // run mode is not officially supported by Chromium and is less stable than
  // the multi-process default. Also configurable using the "single-process"
  // command-line switch.
  ///
  bool single_process;

  ///
  // The path to a separate executable that will be launched for sub-processes.
  // By default the browser process executable is used. See the comments on
  // CefExecuteProcess() for details. Also configurable using the
  // "browser-subprocess-path" command-line switch.
  ///
  cef_string_t browser_subprocess_path;

  ///
  // Set to true (1) to have the browser process message loop run in a separate
  // thread. If false (0) than the CefDoMessageLoopWork() function must be
  // called from your application message loop.
  ///
  bool multi_threaded_message_loop;

  ///
  // Set to true (1) to disable configuration of browser process features using
  // standard CEF and Chromium command-line arguments. Configuration can still
  // be specified using CEF data structures or via the
  // CefApp::OnBeforeCommandLineProcessing() method.
  ///
  bool command_line_args_disabled;

  ///
  // The location where cache data will be stored on disk. If empty an in-memory
  // cache will be used for some features and a temporary disk cache for others.
  // HTML5 databases such as localStorage will only persist across sessions if a
  // cache path is specified.
  ///
  cef_string_t cache_path;

  ///
  // To persist session cookies (cookies without an expiry date or validity
  // interval) by default when using the global cookie manager set this value to
  // true. Session cookies are generally intended to be transient and most Web
  // browsers do not persist them. A |cache_path| value must also be specified to
  // enable this feature. Also configurable using the "persist-session-cookies"
  // command-line switch.
  ///
  bool persist_session_cookies;

  ///
  // Value that will be returned as the User-Agent HTTP header. If empty the
  // default User-Agent string will be used. Also configurable using the
  // "user-agent" command-line switch.
  ///
  cef_string_t user_agent;

  ///
  // Value that will be inserted as the product portion of the default
  // User-Agent string. If empty the Chromium product version will be used. If
  // |userAgent| is specified this value will be ignored. Also configurable
  // using the "product-version" command-line switch.
  ///
  cef_string_t product_version;

  ///
  // The locale string that will be passed to WebKit. If empty the default
  // locale of "en-US" will be used. This value is ignored on Linux where locale
  // is determined using environment variable parsing with the precedence order:
  // LANGUAGE, LC_ALL, LC_MESSAGES and LANG. Also configurable using the "lang"
  // command-line switch.
  ///
  cef_string_t locale;

  ///
  // The directory and file name to use for the debug log. If empty, the
  // default name of "debug.log" will be used and the file will be written
  // to the application directory. Also configurable using the "log-file"
  // command-line switch.
  ///
  cef_string_t log_file;

  ///
  // The log severity. Only messages of this severity level or higher will be
  // logged. Also configurable using the "log-severity" command-line switch with
  // a value of "verbose", "info", "warning", "error", "error-report" or
  // "disable".
  ///
  cef_log_severity_t log_severity;

  ///
  // Enable DCHECK in release mode to ease debugging. Also configurable using the
  // "enable-release-dcheck" command-line switch.
  ///
  bool release_dcheck_enabled;

  ///
  // Custom flags that will be used when initializing the V8 JavaScript engine.
  // The consequences of using custom flags may not be well tested. Also
  // configurable using the "js-flags" command-line switch.
  ///
  cef_string_t javascript_flags;

  ///
  // The fully qualified path for the resources directory. If this value is
  // empty the cef.pak and/or devtools_resources.pak files must be located in
  // the module directory on Windows/Linux or the app bundle Resources directory
  // on Mac OS X. Also configurable using the "resources-dir-path" command-line
  // switch.
  ///
  cef_string_t resources_dir_path;

  ///
  // The fully qualified path for the locales directory. If this value is empty
  // the locales directory must be located in the module directory. This value
  // is ignored on Mac OS X where pack files are always loaded from the app
  // bundle Resources directory. Also configurable using the "locales-dir-path"
  // command-line switch.
  ///
  cef_string_t locales_dir_path;

  ///
  // Set to true (1) to disable loading of pack files for resources and locales.
  // A resource bundle handler must be provided for the browser and render
  // processes via CefApp::GetResourceBundleHandler() if loading of pack files
  // is disabled. Also configurable using the "disable-pack-loading" command-
  // line switch.
  ///
  bool pack_loading_disabled;

  ///
  // Set to a value between 1024 and 65535 to enable remote debugging on the
  // specified port. For example, if 8080 is specified the remote debugging URL
  // will be http://localhost:8080. CEF can be remotely debugged from any CEF or
  // Chrome browser window. Also configurable using the "remote-debugging-port"
  // command-line switch.
  ///
  int remote_debugging_port;

  ///
  // The number of stack trace frames to capture for uncaught exceptions.
  // Specify a positive value to enable the CefV8ContextHandler::
  // OnUncaughtException() callback. Specify 0 (default value) and
  // OnUncaughtException() will not be called. Also configurable using the
  // "uncaught-exception-stack-size" command-line switch.
  ///
  int uncaught_exception_stack_size;

  ///
  // By default CEF V8 references will be invalidated (the IsValid() method will
  // return false) after the owning context has been released. This reduces the
  // need for external record keeping and avoids crashes due to the use of V8
  // references after the associated context has been released.
  //
  // CEF currently offers two context safety implementations with different
  // performance characteristics. The default implementation (value of 0) uses a
  // map of hash values and should provide better performance in situations with
  // a small number contexts. The alternate implementation (value of 1) uses a
  // hidden value attached to each context and should provide better performance
  // in situations with a large number of contexts.
  //
  // If you need better performance in the creation of V8 references and you
  // plan to manually track context lifespan you can disable context safety by
  // specifying a value of -1.
  //
  // Also configurable using the "context-safety-implementation" command-line
  // switch.
  ///
  int context_safety_implementation;

  ///
  // Set to true (1) to ignore errors related to invalid SSL certificates.
  // Enabling this setting can lead to potential security vulnerabilities like
  // "man in the middle" attacks. Applications that load content from the
  // internet should not enable this setting. Also configurable using the
  // "ignore-certificate-errors" command-line switch.
  ///
  bool ignore_certificate_errors;

  ///
  // Used on Mac OS X to specify the background color for hardware accelerated
  // content.
  ///
  cef_color_t background_color;
} cef_settings_t;

常用成员
single_process 设置为true将为浏览器和渲染使用单进程。也可配置使用单个进程的命令行开关。
browser_subprocess_path 子进程的单个执行体路径，
multi_threaded_message_loop为true表示浏览器进程的消息循环以单线程运行。
command_line_args_idsabled为true表示禁用使用标准的CEF和Chrominum命令行参数的浏览器进程配置的特性。
cache_path缓存数据保存在磁盘上，如果为空，内存缓存会被某些特性使用，临时磁盘缓存会被其他地方使用。如果不为空，如HTML5本地存储数据库会跨域。
locale locale字符串会传递给blink,默认为en-US
log_file为debuglog文件路径
log_severity日志等级
resources_dir_path资料的目录路径。即cef.pak或devtools_resources.pak文件的保存路径
locales_dir_path
locales_dir_path locales的保存路径
remote_debugging_port远程调试端口。范围在1024~65535