linux环境下C语言实现图片的socket传输并保存到数据库

#include <stdlib.h> #include <sys/types.h> #include <stdio.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <string.h> #include <string.h> #include <unistd.h> #include <sys/errno.h> #include <stdarg.h> #include <time.h> #include <sys/stat.h> int PtTcpSnd(int sockfd, char *buffer, int length) { int len; int totalcnt; totalcnt = 0; printf("Now Send Socket[%d]...",sockfd); while(totalcnt < length) { len = write(sockfd, buffer + totalcnt, length - totalcnt); printf("Send Socket len[%d]",len); if (len < 0) { if (errno == EINTR) { len = 0; break; } else return(-1); } else if (len == 0) break; totalcnt = totalcnt + len; } return(totalcnt); } int main() { int cfd; struct sockaddr_in s_add; unsigned short portnum=12306; printf("Hello,welcome to client !\r\n"); cfd = socket(AF_INET, SOCK_STREAM, 0); if(-1 == cfd) { printf("socket fail ! \r\n"); return -1; } printf("socket ok !\r\n"); bzero(&s_add,sizeof(struct sockaddr_in)); s_add.sin_family=AF_INET; s_add.sin_addr.s_addr= inet_addr("127.0.0.1"); s_add.sin_port=htons(portnum); if(-1 == connect(cfd,(struct sockaddr *)(&s_add), sizeof(struct sockaddr))) { printf("connect fail !\r\n"); return -1; } printf("connect ok !\r\n"); FILE *fp = fopen("qr.jpg", "rb"); if (fp == NULL) { fprintf(stderr, "cannot open image file\n"); exit(1); } fseek(fp, 0, SEEK_END); if (ferror(fp)) { fprintf(stderr, "fseek() failed\n"); int r = fclose(fp); if (r == EOF) { fprintf(stderr, "cannot close file handler\n"); } exit(1); } int flen = ftell(fp); if (flen == -1) { perror("error occurred"); int r = fclose(fp); if (r == EOF) { fprintf(stderr, "cannot close file handler\n"); } exit(1); } fseek(fp, 0, SEEK_SET); if (ferror(fp)) { fprintf(stderr, "fseek() failed\n"); int r = fclose(fp); if (r == EOF) { fprintf(stderr, "cannot close file handler\n"); } exit(1); } char data[flen+1]; int size = fread(data, 1, flen, fp); if (ferror(fp)) { fprintf(stderr, "fread() failed\n"); int r = fclose(fp); if (r == EOF) { fprintf(stderr, "cannot close file handler\n"); } exit(1); } int r = fclose(fp); if (r == EOF) { fprintf(stderr, "cannot close file handler\n"); } printf("%d\n [%#x]\n", size, data); if (PtTcpSnd(cfd, data, size) < 0) { printf("sending on stream socket"); close(cfd); exit(0); } close(cfd); return 0; }