SOCKET客户端 发送数据例子

#include "stdio.h" #include "winsock2.h" #pragma comment(lib,"ws2_32") #define PORT 4000 #define IP_ADDRESS "127.0.0.1" int SockRecvPkg(int sockfd, unsigned char *buffer, int *size) { int letf=0, dlen = 0, tmplen = 0; int pkglen = 0; int rv = 0; int buflen = 0; if (buffer == NULL&&size == NULL) { printf("null"); return -1; } // rv = recv(sockfd,(char *)&pkglen,); } int SendData(int sockfd, unsigned char *buffer, int size) { int left,dlen,tmplen; left = size; dlen = 0; while ((tmplen = send(sockfd,(const char *)&buffer[dlen],left,0))<left) { if (tmplen <= 0) { if (errno == 4) { continue; } } dlen += tmplen; left -= tmplen; } return 0; } int main() { WSADATA wsadata; SOCKET Clientsok; struct sockaddr_in serveraddr; char buf[30] = "i come"; char recvbuf[100]; int Ret = -1; int len; Ret = WSAStartup(MAKEWORD(2,2),&wsadata); if (Ret != 0) { printf("初始化失败！"); return -1; } Clientsok = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if ( Clientsok == INVALID_SOCKET ) { printf("error"); return -1; } serveraddr.sin_family = AF_INET; serveraddr.sin_addr.s_addr = inet_addr(IP_ADDRESS); serveraddr.sin_port = htons(PORT); memset(serveraddr.sin_zero, 0x00, 8); Ret = connect(Clientsok, (struct sockaddr*)&serveraddr, sizeof(serveraddr)); if ( Ret != 0 ) { return -1; } Ret = SendData(Clientsok,buf,10); if (Ret == 0) { printf("send success"); } // Ret = send(Clientsok,buf,10,0); // if ( Ret < 0 ) // { // return -1; // } // Ret = recv(Clientsok,recvbuf,10,0); if ( Ret < 0 ) { return -1; } printf("recv data :%s\n",recvbuf); closesocket(Clientsok); WSACleanup(); return 0; }