如何在你的应用程序中使用Boost.Asio库,以及关于库依赖和所支持平台信息。
介绍使用Boost.Asio必备的基本概念,同时示范如何使用Boost.Aaio开发简单的客户端/服务器程序。
在更加复杂的应用程序中使用Boost.Asio的示例。
类和函数的详细参考
Boost.Asio库的基本原理及设计思路。
已测试的平台和编译器:
以下的平台可能也可以使用:
以下是使用Boost.Asio必需的链接库:
另外,一些例子需要提供Boost.Thread,Boost.Date_Time 或Boost.Serialization 库的支持。
注意:
使用MSVC或Borland C++,你可能需要在“工程设置”中分别添加-DBOOST_DATE_TIME_NO_LIB和-DBOOST_REGEX_NO_LIB声明,分别禁止Boost.Date_Time和Boost.Regex的自动链接,当然你也可以这样做:build这两个库,然后链接。
-----------------------------------------------------------------------------------------------------
编译Boost库:
You may build the subset of Boost libraries required to use Boost.Asio and its examples by running the following command from the root of the Boost download package:
你可以在下载包的根目录下执行如下的命令来编译Boost.Asio所必需的Boost库子集。
This assumes that you have already builtbjam. Consult the Boost.Build documentation for more details.
这里假设你已经编译了bjam。请参考Boost.Build文档以获得更多信息。
---------------------------------------------------------------------------------------------------------------------------
宏
The macros listed in the table below may be used to control the behaviour of Boost.Asio.
下表中的宏用来控制Boost.Asio的状态。
Macro
Description
BOOST_ASIO_ENABLE_BUFFER_DEBUGGING |
Enables Boost.Asio's buffer debugging support, which can help identify when invalid buffers are used in read or write operations (e.g. if a std::string object being written is destroyed before the write operation completes). When using Microsoft Visual C++, this macro is defined automatically if the compiler's iterator debugging support is enabled, unlessBOOST_ASIO_DISABLE_BUFFER_DEBUGGINGhas been defined. When using g++, this macro is defined automatically if standard library debugging is enabled (_GLIBCXX_DEBUGis defined), unlessBOOST_ASIO_DISABLE_BUFFER_DEBUGGINGhas been defined. |
BOOST_ASIO_DISABLE_BUFFER_DEBUGGING |
Explictly disables Boost.Asio's buffer debugging support. |
BOOST_ASIO_DISABLE_DEV_POLL |
Explicitly disables /dev/poll support on Solaris, forcing the use of aselect-based implementation. |
BOOST_ASIO_DISABLE_EPOLL |
Explicitly disablesepollsupport on Linux, forcing the use of aselect-based implementation. |
BOOST_ASIO_DISABLE_KQUEUE |
Explicitly disableskqueuesupport on Mac OS X and BSD variants, forcing the use of aselect-based implementation. |
BOOST_ASIO_DISABLE_IOCP |
Explicitly disables I/O completion ports support on Windows, forcing the use of aselect-based implementation. |
BOOST_ASIO_NO_WIN32_LEAN_AND_MEAN |
By default, Boost.Asio will automatically defineWIN32_LEAN_AND_MEANwhen compiling for Windows, to minimise the number of Windows SDK header files and features that are included. The presence ofBOOST_ASIO_NO_WIN32_LEAN_AND_MEANpreventsWIN32_LEAN_AND_MEANfrom being defined. |
BOOST_ASIO_NO_DEFAULT_LINKED_LIBS |
When compiling for Windows using Microsoft Visual C++ or Borland C++, Boost.Asio will automatically link in the necessary Windows SDK libraries for sockets support (i.e. ws2_32.lib and mswsock.lib, or ws2.lib when building for Windows CE). TheBOOST_ASIO_NO_DEFAULT_LINKED_LIBSmacro prevents these libraries from being linked. |
BOOST_ASIO_SOCKET_STREAMBUF_MAX_ARITY |
Determines the maximum number of arguments that may be passed to thebasic_socket_streambufclass template'sconnectmember function. Defaults to 5. |
BOOST_ASIO_SOCKET_IOSTREAM_MAX_ARITY |
Determines the maximum number of arguments that may be passed to thebasic_socket_iostreamclass template's constructor andconnectmember function. Defaults to 5. |
BOOST_ASIO_ENABLE_CANCELIO |
Enables use of theCancelIofunction on older versions of Windows. If not enabled, calls tocancel()on a socket object will always fail withasio::error::operation_not_supportedwhen run on Windows XP, Windows Server 2003, and earlier versions of Windows. When running on Windows Vista, Windows Server 2008, and later, theCancelIoExfunction is always used. TheCancelIofunction has two issues that should be considered before enabling its use: * It will only cancel asynchronous operations that were initiated in the current thread. * It can appear to complete without error, but the request to cancel the unfinished operations may be silently ignored by the operating system. Whether it works or not seems to depend on the drivers that are installed. For portable cancellation, consider using one of the following alternatives: * Disable asio's I/O completion port backend by defining BOOST_ASIO_DISABLE_IOCP. * Use the socket object's close() function to simultaneously cancel the outstanding operations and close the socket. |
基本技能
本指南的第一部分主要介绍使用Asio工具包所需要了解的基本概念。在进入复杂的网络编程世界之前,这些示例程序将举一些使用简单异步定时器的例子。
介绍套接字
这部分的实例主要介绍如何使用Asio开发简单的客户端/服务器程序。这些程序都基于同时支持TCP和UDP协议的daytime协议。
前三个程序用TCP实现daytime协议。
接下来的三个程序用UDP实现daytime协议。
本部分的最后一个程序演示了asio怎样将TCP和UDP服务器简易的组合到一个程序里。
如何在你的应用程序中使用Boost.Asio库,以及关于库依赖和所支持平台信息。
介绍使用Boost.Asio必备的基本概念,同时示范如何使用Boost.Aaio开发简单的客户端/服务器程序。
在更加复杂的应用程序中使用Boost.Asio的示例。
类和函数的详细参考
Boost.Asio库的基本原理及设计思路。
已测试的平台和编译器:
以下的平台可能也可以使用:
以下是使用Boost.Asio必需的链接库:
另外,一些例子需要提供Boost.Thread,Boost.Date_Time 或Boost.Serialization 库的支持。
注意:
使用MSVC或Borland C++,你可能需要在“工程设置”中分别添加-DBOOST_DATE_TIME_NO_LIB和-DBOOST_REGEX_NO_LIB声明,分别禁止Boost.Date_Time和Boost.Regex的自动链接,当然你也可以这样做:build这两个库,然后链接。
-----------------------------------------------------------------------------------------------------
编译Boost库:
You may build the subset of Boost libraries required to use Boost.Asio and its examples by running the following command from the root of the Boost download package:
你可以在下载包的根目录下执行如下的命令来编译Boost.Asio所必需的Boost库子集。
This assumes that you have already builtbjam. Consult the Boost.Build documentation for more details.
这里假设你已经编译了bjam。请参考Boost.Build文档以获得更多信息。
---------------------------------------------------------------------------------------------------------------------------
宏
The macros listed in the table below may be used to control the behaviour of Boost.Asio.
下表中的宏用来控制Boost.Asio的状态。
Macro
Description
BOOST_ASIO_ENABLE_BUFFER_DEBUGGING |
Enables Boost.Asio's buffer debugging support, which can help identify when invalid buffers are used in read or write operations (e.g. if a std::string object being written is destroyed before the write operation completes). When using Microsoft Visual C++, this macro is defined automatically if the compiler's iterator debugging support is enabled, unlessBOOST_ASIO_DISABLE_BUFFER_DEBUGGINGhas been defined. When using g++, this macro is defined automatically if standard library debugging is enabled (_GLIBCXX_DEBUGis defined), unlessBOOST_ASIO_DISABLE_BUFFER_DEBUGGINGhas been defined. |
BOOST_ASIO_DISABLE_BUFFER_DEBUGGING |
Explictly disables Boost.Asio's buffer debugging support. |
BOOST_ASIO_DISABLE_DEV_POLL |
Explicitly disables /dev/poll support on Solaris, forcing the use of aselect-based implementation. |
BOOST_ASIO_DISABLE_EPOLL |
Explicitly disablesepollsupport on Linux, forcing the use of aselect-based implementation. |
BOOST_ASIO_DISABLE_KQUEUE |
Explicitly disableskqueuesupport on Mac OS X and BSD variants, forcing the use of aselect-based implementation. |
BOOST_ASIO_DISABLE_IOCP |
Explicitly disables I/O completion ports support on Windows, forcing the use of aselect-based implementation. |
BOOST_ASIO_NO_WIN32_LEAN_AND_MEAN |
By default, Boost.Asio will automatically defineWIN32_LEAN_AND_MEANwhen compiling for Windows, to minimise the number of Windows SDK header files and features that are included. The presence ofBOOST_ASIO_NO_WIN32_LEAN_AND_MEANpreventsWIN32_LEAN_AND_MEANfrom being defined. |
BOOST_ASIO_NO_DEFAULT_LINKED_LIBS |
When compiling for Windows using Microsoft Visual C++ or Borland C++, Boost.Asio will automatically link in the necessary Windows SDK libraries for sockets support (i.e. ws2_32.lib and mswsock.lib, or ws2.lib when building for Windows CE). TheBOOST_ASIO_NO_DEFAULT_LINKED_LIBSmacro prevents these libraries from being linked. |
BOOST_ASIO_SOCKET_STREAMBUF_MAX_ARITY |
Determines the maximum number of arguments that may be passed to thebasic_socket_streambufclass template'sconnectmember function. Defaults to 5. |
BOOST_ASIO_SOCKET_IOSTREAM_MAX_ARITY |
Determines the maximum number of arguments that may be passed to thebasic_socket_iostreamclass template's constructor andconnectmember function. Defaults to 5. |
BOOST_ASIO_ENABLE_CANCELIO |
Enables use of theCancelIofunction on older versions of Windows. If not enabled, calls tocancel()on a socket object will always fail withasio::error::operation_not_supportedwhen run on Windows XP, Windows Server 2003, and earlier versions of Windows. When running on Windows Vista, Windows Server 2008, and later, theCancelIoExfunction is always used. TheCancelIofunction has two issues that should be considered before enabling its use: * It will only cancel asynchronous operations that were initiated in the current thread. * It can appear to complete without error, but the request to cancel the unfinished operations may be silently ignored by the operating system. Whether it works or not seems to depend on the drivers that are installed. For portable cancellation, consider using one of the following alternatives: * Disable asio's I/O completion port backend by defining BOOST_ASIO_DISABLE_IOCP. * Use the socket object's close() function to simultaneously cancel the outstanding operations and close the socket. |
基本技能
本指南的第一部分主要介绍使用Asio工具包所需要了解的基本概念。在进入复杂的网络编程世界之前,这些示例程序将举一些使用简单异步定时器的例子。
介绍套接字
这部分的实例主要介绍如何使用Asio开发简单的客户端/服务器程序。这些程序都基于同时支持TCP和UDP协议的daytime协议。
前三个程序用TCP实现daytime协议。
接下来的三个程序用UDP实现daytime协议。
本部分的最后一个程序演示了asio怎样将TCP和UDP服务器简易的组合到一个程序里。