UDP Socket编程 C/C++实现 （Windows Platform SDK）
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UDP Socket编程 C/C++实现 （Windows Platform SDK）
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挺無聊一小程序，倆SB一人說一句，據說聊天程序最好用UDP寫。 Server：
[csharp]?view plaincopy #pragma?comment?(lib,"ws2_32.lib")?? ? #include?<Winsock2.h>?? ? #include?<stdio.h>?? ?? ?? ?? void?main()?? ?? {?? ?? ????//版本協商?? ?? ????WORD?wVersionRequested;?? ?? ????WSADATA?wsaData;?? ?? ????int?err;?? ?? ?????? ?? ????wVersionRequested?=?MAKEWORD(?1,?1?);?? ?? ?????? ?? ????err?=?WSAStartup(?wVersionRequested,?&wsaData?);?? ?? ????if?(?err?!=?0?)?{?? ?? ????????/*?Tell?the?user?that?we?could?not?find?a?usable?*/?? ?? ????????/*?WinSock?DLL.??????????????????????????????????*/?? ?? ????????return;?? ?? ????}?? ?? ?????? ?? ????/*?Confirm?that?the?WinSock?DLL?supports?2.2.*/?? ?? ????/*?Note?that?if?the?DLL?supports?versions?greater????*/?? ?? ????/*?than?2.2?in?addition?to?2.2,?it?will?still?return?*/?? ?? ????/*?2.2?in?wVersion?since?that?is?the?version?we??????*/?? ?? ????/*?requested.????????????????????????????????????????*/?? ?? ?????? ?? ????if?(?LOBYTE(?wsaData.wVersion?)?!=?1?||?? ?? ????????HIBYTE(?wsaData.wVersion?)?!=?1)?{?? ?? ????????/*?Tell?the?user?that?we?could?not?find?a?usable?*/?? ?? ????????/*?WinSock?DLL.??????????????????????????????????*/?? ?? ????????WSACleanup(?);?? ?? ????????return;??? ?? ????}?? ?? ?????? ?? ????/*?The?WinSock?DLL?is?acceptable.?Proceed.?*/?? ?? ????//創建數據報套接字?? ?? ????SOCKET?svr?=?socket(AF_INET,SOCK_DGRAM,0);?? ?? ????//創建本地地址信息?? ?? ????SOCKADDR_IN?addr;?? ?? ????addr.sin_family?=?AF_INET;?? ?? ????addr.sin_port?=?htons(6000);?? ?? ????addr.sin_addr.S_un.S_addr?=?htonl(INADDR_ANY);?? ?? ????int?len?=?sizeof(sockaddr);?? ?? ????bind(svr,(sockaddr*)&addr,len);?? ?? ????//創建客戶端地址對象?? ?? ????SOCKADDR_IN?addrClient;?? ?? ????char?recvBuf[128];?? ?? ????char?sendBuf[128];?? ?? ????char?tempBuf[256];?? ?? ?????? ?? ????while(true)?? ?? ????{?? ?? ????????//接收數據?? ?? ????????recvfrom(svr,recvBuf,128,0,(sockaddr*)&addrClient,&len);?? ?? ????????char*?ipClient?=?inet_ntoa(addrClient.sin_addr);?? ?? ????????sprintf(tempBuf,"%s?said:?%s/n",ipClient,recvBuf);?? ?? ????????printf("%s",tempBuf);?? ?? ????????gets(sendBuf);?? ?? ????????//發送數據?? ?? ????????sendto(svr,sendBuf,strlen(sendBuf)+1,0,(sockaddr*)&addrClient,len);?? ?? ????}?? ?? ????closesocket(svr);?? ?? ????WSACleanup();?? ?? }??
Client：
[csharp]?view plaincopy #pragma?comment?(lib,"ws2_32.lib")?? ? #include?<Winsock2.h>?? ? #include?<stdio.h>?? ?? ?? ?? void?main()?? ?? {?? ?? ????//版本協商?? ?? ????WORD?wVersionRequested;?? ?? ????WSADATA?wsaData;?? ?? ????int?err;?? ?? ?????? ?? ????wVersionRequested?=?MAKEWORD(?1,?1?);?? ?? ?????? ?? ????err?=?WSAStartup(?wVersionRequested,?&wsaData?);?? ?? ????if?(?err?!=?0?)?{?? ?? ????????/*?Tell?the?user?that?we?could?not?find?a?usable?*/?? ?? ????????/*?WinSock?DLL.??????????????????????????????????*/?? ?? ????????return;?? ?? ????}?? ?? ?????? ?? ????/*?Confirm?that?the?WinSock?DLL?supports?2.2.*/?? ?? ????/*?Note?that?if?the?DLL?supports?versions?greater????*/?? ?? ????/*?than?2.2?in?addition?to?2.2,?it?will?still?return?*/?? ?? ????/*?2.2?in?wVersion?since?that?is?the?version?we??????*/?? ?? ????/*?requested.????????????????????????????????????????*/?? ?? ?????? ?? ????if?(?LOBYTE(?wsaData.wVersion?)?!=?1?||?? ?? ????????HIBYTE(?wsaData.wVersion?)?!=?1?)?{?? ?? ????????/*?Tell?the?user?that?we?could?not?find?a?usable?*/?? ?? ????????/*?WinSock?DLL.??????????????????????????????????*/?? ?? ????????WSACleanup(?);?? ?? ????????return;??? ?? ????}?? ?? ?????? ?? ????/*?The?WinSock?DLL?is?acceptable.?Proceed.?*/?? ?? ????//創建服務器套接字?? ?? ????SOCKET?Svr?=?socket(AF_INET,SOCK_DGRAM,0);?? ?? ????//創建地址?? ?? ????SOCKADDR_IN?addrSvr;?? ?? ????addrSvr.sin_family?=?AF_INET;?? ?? ????addrSvr.sin_port?=?htons(6000);?? ?? ????addrSvr.sin_addr.S_un.S_addr?=?inet_addr("127.0.0.1");?? ?? ????char?recvBuf[128];?? ?? ????char?sendBuf[128];?? ?? ????int?len?=?sizeof(sockaddr);?? ?? ?? ?? ????while(true)?? ?? ????{?? ?? ????????gets(sendBuf);?? ?? ????????//發送數據?? ?? ????????sendto(Svr,sendBuf,strlen(sendBuf)+1,0,(sockaddr*)&addrSvr,len);?? ?? ????????//接收數據?? ?? ????????recvfrom(Svr,recvBuf,128,0,(sockaddr*)&addrSvr,&len);?? ?? ????????char*?ipSvr?=?inet_ntoa(addrSvr.sin_addr);?? ?? ????????printf("%s?said:?%s/n",ipSvr,recvBuf);?? ?? ????}?? ?? ????closesocket(Svr);?? ?? ????WSACleanup();?? ?? } ?
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