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[M132][Part_1] chromium codelab

发表于 2024-05-05 更新于 2025-06-08 分类于 chromium

chromium codelab demo

Prerequisite: Getting the Code

略

Part 1: Using command-line arguments

main函数开头需要加上下面的代码设置下日志的输出方式

logging::LoggingSettings settings;
settings.logging_dest = logging::LOG_TO_ALL;  // 默认就是控制台
settings.log_file_path = FILE_PATH_LITERAL("hello_world.log");
logging::InitLogging(settings);

Part 2: Callbacks and Bind

是个move-only对象

// The type of a callback that:
//  - Can run only once.
//  - Is move-only and non-copyable.
//  - Takes no arguments and does not return anything.
// base::OnceClosure is an alias of this type.
base::OnceCallback<void()>

执行的时候要加std::move

void MyFunction1(base::OnceCallback<int(std::string, double)> my_callback) {
  // OnceCallback
  int result1 = std::move(my_callback).Run("my string 1", 1.0);

  // After running a OnceCallback, it's consumed and nulled out.
  DCHECK(!my_callback);
  ...
}

Part 3: Threads and task runners

Threading and Tasks in Chrome

There are a number of ways to post tasks to a thread pool or task runner.

PostTask()
PostDelayedTask() if you want to add a delay.
PostTaskAndReply() lets you post a task which will post a task back to your current thread when its done.
PostTaskAndReplyWithResult() to automatically pass the return value of the first call as argument to the second call.

参考链接