用C编写的winsocket程序

#include "stdio.h" #include "winsock2.h" #include "stdlib.h" #include "string.h" #pragma comment(lib,"Wsock32.lib") #define _MagicNumberT 0xfffe3141 #define _MagicNumberU 0xffef3141 #define _SNDID_Len 32 #define _PostData_Len 256 typedef struct _A1_Packet { DWORD magicnum; unsigned char SNSID[_SNDID_Len]; unsigned char PostData[_PostData_Len]; }_A1_Packet; void main() { SOCKET TCPSocket,UDPSocket; WSADATA lpwsdata; char str[292]; int i=0,recieve; struct _A1_Packet pkgBuffer={_MagicNumberT,"M200872040\0"}; struct sockaddr_in server; DWORD a=_MagicNumberU; memcpy(str,&pkgBuffer,sizeof(pkgBuffer)); if(WSAStartup(MAKEWORD(2,2),&lpwsdata))//加载winsock库 { printf("winsock无法初始化！\n"); } server.sin_family=AF_INET; server.sin_port=htons(3801); server.sin_addr.s_addr = inet_addr("202.112.20.184"); i=sizeof(server); TCPSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(connect(TCPSocket, (struct sockaddr *)&server, sizeof(server))==SOCKET_ERROR)//连接tcp服务器 { printf("connect error!!"); } if(send(TCPSocket, str, sizeof(pkgBuffer), 0)==SOCKET_ERROR)//发送 { printf("send error!!"); } do { recieve=recv(TCPSocket, str, sizeof(pkgBuffer), 0);//接收回复 if(recieve==SOCKET_ERROR) printf("recv Error!\n"); }while(recieve!=0); printf("%s\n",&str[36]); UDPSocket= socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP); memcpy(str,&a,sizeof(a)); if (sendto(UDPSocket,str,sizeof(str),0,(struct sockaddr *)&server,sizeof(server))==SOCKET_ERROR) { printf("send error!!!"); } if ( recvfrom(UDPSocket,str,sizeof(str),0,(struct sockaddr *)&server,&i) == SOCKET_ERROR) { printf("recieve error!!!"); } printf("%s\n",&str[4]); WSACleanup(); }