winsock.pbl编程实例资源-CSDN文库

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《PB Winsock.pbl编程实例解析》在IT领域，PowerBuilder（PB）是一种流行的可视化开发工具，尤其在企业级应用开发中占据了重要的地位。它提供了丰富的库和对象，使得开发者能够快速构建功能强大的应用程序。其中，Winsock控件是PB提供的一种用于网络通信的重要组件，它基于Windows Socket API（简称Winsock）。本篇文章将深入探讨“winsock.pbl”编程实例，旨在帮助初学者更好地理解和应用Winsock控件进行网络编程。让我们理解一下Winsock.pbl的核心概念。Winsock.pbl是一个PowerBuilder库文件，它包含了一系列与网络通信相关的类和对象。在这个实例中，它提供了一个完整的Socket编程模型，可以用来创建客户端或服务器端的应用程序。Socket编程是网络编程的基础，它允许应用程序通过Internet协议（如TCP/IP）进行数据交换。在PowerBuilder中，Winsock控件是通过`PBWinsockObject`类实现的，它封装了底层的Winsock API。这个控件允许开发者处理各种网络操作，如建立连接、发送和接收数据、监听客户端请求等。在“PBSOCKET”这个文件中，我们可以看到如何在PB环境中创建和使用这些对象的示例代码。对于初学者来说，理解以下几个关键概念至关重要： 1. **连接（Connection）**：使用Winsock控件，开发者可以通过调用`Connect`方法来建立与远程服务器的连接。这通常涉及到指定服务器的IP地址和端口号。 2. **监听（Listening）**：在服务器端，Winsock控件需要设置为监听模式，以便接收客户端的连接请求。`Listen`方法用于开启监听，而`Accept`方法则用于接受新的连接。 3. **发送和接收数据（Sending and Receiving Data）**：`SendData`和`ReceiveData`方法是Winsock控件的核心，它们分别用于向网络发送数据和接收来自网络的数据。开发者需要处理好数据的编码和解码，确保正确传输。 4. **事件驱动编程（Event-driven Programming）**：PB中的Winsock控件支持事件驱动编程模型，例如`ConnectError`、`ReceiveDone`和`SendDone`事件，当特定网络操作完成或出错时，这些事件会被触发，从而执行相应的处理代码。 5. **错误处理（Error Handling）**：在编写Winsock应用时，必须考虑各种可能出现的网络错误，比如连接失败、数据传输错误等。通过检查返回值和捕获错误事件，开发者可以编写健壮的网络程序。 6. **套接字类型（Socket Types）**：Winsock支持两种主要的套接字类型，TCP（面向连接）和UDP（无连接）。TCP保证数据的顺序和可靠性，而UDP则提供了更低的延迟和更高的效率，但不保证数据的到达。通过学习和分析“winsock.pbl”中的实例，初学者可以逐步掌握如何在PB中构建网络应用程序，无论是实现简单的文件传输，还是复杂的多用户交互系统。在实践中不断探索和调试，是提升Winsock编程技能的关键。总结，PB的Winsock.pbl编程实例是一个宝贵的教育资源，它提供了直观的代码示例，帮助开发者了解如何利用Winsock控件进行网络通信。通过深入研究和实践，初学者可以迅速提升在网络编程领域的专业技能，为后续的项目开发打下坚实基础。

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PBSOCKET.rar （13个子文件）

PBSOCKET

socketclient.pbl 63KB

socketserver.pbt 188B

socketserver.pbl 120KB

Pslib21.htm 178KB

PSLIB21.DLL 32KB

socketclient.exe 354KB

winsock.pbl 156KB

pbdwe60.dll 1.53MB

socketserver.pbw 176B

pbvm60.dll 3.25MB

socketserver.exe 487KB

socketclient.pbt 218B

socket.pbw 176B

<html> <head> <title>PowerSocket Library Version 2.1</title> </head><body><CENTER> <h1>The PowerSocket Library</h1> <h2>Network Programming using PowerBuilder and Winsock Version 1.1 </h2><H3>PowerSocket Version 2.1 - January 8, 1999</H3></CENTER> <hr><H1>Table of Contents</H1><ul><li><a href="#Authors">Authors, Copyright, and Purchasing information</a><li><a href="#GettingStarted">Getting Started</a> <li><a href="#WinsockUserObject">Winsock User Object</a> Functions <ul> <li><a href="#HtoNL">htonl()</a> Convert an unsigned long value from host byte order to network byte order. <li><a href="#HtoNS">htons()</a> Convert an integer value from host byte order to network byte order. <li><a href="#InetAddr">inet_addr()</a> Convert a string containing an IP address in the Internet standard ``.'' notation to an unsigned long value in network byte order. <li><a href="#InetNtoA">inet_ntoa()</a> Convert an unsigned long value in network byte order to the string equivalent IP address in Internet standard ``.'' notation. <li><a href="#NtoHL">ntohl()</a> Convert an unsigned long value from network byte order to host byte order. <li><a href="#NtoHS">ntohs()</a> Convert an integer value from network byte order to host byte order. <li><a href="#Select">wsselect()</a> Perform synchronous I/O multiplexing. <li><a href="#GetHostByAddr">gethostbyaddr()</a> Retrieve the name(s) and address corresponding to an IP address provided as an unsigned long value in network byte order. <li><a href="#GetHostByName">gethostbyname()</a> Retrieve the name(s) and address corresponding to a host name. <li><a href="#GetHostName">gethostname()</a> Retrieve the name of the local host. <li><a href="#GetProtoByName">getprotobyname()</a> Retrieve the protocol name and number corresponding to a protocol name. <li><a href="#GetProtoByNumber">getprotobynumber()</a> Retrieve the protocol name and number corresponding to a protocol number. <li><a href="#GetServByName">getservbyname()</a> Retrieve the service name and port corresponding to a service name. <li><a href="#GetServByPort">getservbyport()</a> Retrieve the service name and port corresponding to a port. <li><a href="#CancelAsyncRequest">WSACancelAsyncRequest()</a> Cancel an outstanding instance of a WSAAsyncGetXByY() function. <li><a href="#CancelBlockingCall">WSACancelBlockingCall()</a> Cancel an outstanding "blocking" API call <li><a href="#GetLastError">WSAGetLastError()</a> Obtain details of last Windows Sockets API error <li><a href="#IsBlocking">WSAIsBlocking()</a> Determine if the underlying Windows Sockets DLL is already blocking an existing call for this thread <li><a href="#SetLastError">WSASetLastError()</a> Set the error to be returned by a subsequent WSAGetLastError() <li><a href="#AsyncGetHostByAddr">WSAAsyncGetHostByAddr()</a> Get host information corresponding to an address - asynchronous version <li><a href="#AsyncGetHostByName">WSAAsyncGetHostByName()</a> Get host information corresponding to a hostname - asynchronous version. <li><a href="#AsyncGetProtoByName">WSAAsyncGetProtoByName()</a> Get protocol information corresponding to a protocol name - asynchronous version. <li><a href="#AsyncGetProtoByNumber">WSAAsyncGetProtoByNumber()</a> Get protocol information corresponding to a protocol number - asynchronous version. <li><a href="#AsyncGetServByName">WSAAsyncGetServByName()</a> Get service information corresponding to a service name and protocol -- asynchronous version. <li><a href="#AsyncGetServByPort">WSAAsyncGetServByPort()</a> Get service information corresponding to a port and protocol - asynchronous version. <li><a href="#return_hostent">return_hostent()</a> Read a string buffer containing a hostent structure and return a pbhostent structure. <li><a href="#return_servent">return_servent()</a> Read a string buffer containing a servent structure and return a pbservent structure. <li><a href="#return_protoent">return_protoent()</a> Read a string buffer containing a protoent structure and return a pbprotoent structure. <li><a href="#WSAgetselecterror">WSAGetSelectError()</a> Return the upper 16 bits (the error code portion) of the LongParm value passed as a parameter. <li><a href="#WSAgetselectevent">WSAGetSelectEvent()</a> Return the lower 16 bits (the network event code portion) of the LongParm value passed as a parameter. <li><a href="#WSAgetasyncbuflen">WSAGetAsyncBufLen()</a> Return the lower 16 bits (the required buffer length portion) of the LongParm value passed as a parameter. <li><a href="#WSAgetasyncerror">WSAGetAsyncError()</a> Return the upper 16 bits (the error code portion) of the LongParm value passed as a parameter. <li><a href="#WSOr">WSOr()</a> Perform a binary OR operation on two integers and return the result. <li><a href="#UnhookBlockingHook">WSAUnhookBlockingHook()</a> Restore the original blocking hook function.</li> </ul> <li><a href="#SocketUserObject">Socket User Object</a> <ul> <li><a href="#Accept">accept()</a> An incoming connection is acknowledged and associated with an immediately created socket. The original socket is returned to the listening state. <li><a href="#Bind">bind()</a> Assign a local name to an unnamed socket. <li><a href="#CloseSocket">closesocket()</a> Remove a socket descriptor from the per-process object reference table. Only blocks if SO_LINGER is set. <li><a href="#Connect">wsconnect()</a> Initiate a connection on the specified socket. <li><a href="#GetPeerName">getpeername()</a> Retrieve the name of the peer connected to the specified socket descriptor. <li><a href="#GetSockName">getsockname()</a> Retrieve the current name for the specified socket <li><a href="#GetSockOpt">getsockopt()</a> Retrieve options associated with the specified socket descriptor. <li><a href="#IOCTLSocket">ioctlsocket()</a> Provide control for descriptors. <li><a href="#Listen">listen()</a> Listen for incoming connections on a specified socket. <li><a href="#Recv">recv()</a> Receive data from a connected socket. <li><a href="#RecvFrom">recvfrom()</a> Receive data from either a connected or unconnected socket. <li><a href="#Send">send()</a> Send data to a connected socket. <li><a href="#SendTo">sendto()</a> Send data to either a connected or unconnected socket. <li><a href="#SetSockOpt">setsockopt()</a> Store options associated with the specified socket descriptor. <li><a href="#Shutdown">shutdown()</a> Shut down part of a full-duplex connection. <li><a href="#Socket">socket()</a> Create an endpoint for communication and return a socket descriptor. <li><a href="#AsyncSelect">WSAAsyncSelect()</a> Perform asynchronous version of wsselect() <li><a href="#GetSocketNumber">GetSocketNumber()</a></li> </ul> <li><a href="#SocketStreamUserObject">SocketStream User Object</a> <li><a href="#SocketDGramUserObject">SocketDGram User Object</a></li> </ul><hr><h1><a name="Authors">Authors, Copyright, and Purchasing</a></h1><h2><A HREF="mailto:jasonc@science.org">Jason Coombs</A></h2> <ul> <li><A HREF="http:

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