Linux下的C程序：讀取遠程服務器上的網頁源碼。

/*功能：WWW超文本源碼瀏覽器 */#include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdarg.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h>// connect to domain at port int htconnect(char *domain, int port) {int white_sock;struct hostent *site;struct sockaddr_in me;site = gethostbyname(domain);if(site == NULL)return -2;white_sock = socket(AF_INET, SOCK_STREAM, 0);if(white_sock < 0)return -1;memset(&me, 0, sizeof(struct sockaddr_in));memcpy(&me.sin_addr, site->h_addr_list[0], site->h_length);me.sin_family = AF_INET;me.sin_port = htons(port);return (connect(white_sock, (struct sockaddr*)&me, sizeof(struct sockaddr)) < 0) ? 1 : white_sock; }// send formatted string to the port int htsend(int sock, char *fmt, ...) {char buf[1024];va_list argptr;va_start(argptr, fmt);vsprintf(buf, fmt, argptr);va_end(argptr);return send(sock, buf, strlen(buf), 0); }void main(int argc, char **argv) {int black_sock;char bugs_bunny[3];if(argc < 2){printf("Usage:\t %s <host>\n", argv[0]);return ;}black_sock = htconnect(argv[1], 80);if(black_sock < 0){printf("Socket connect error\n");return ;}htsend(black_sock, "GET /joe.html HTTP/1.0%c", 10); // [/joe.html]: requested page on the serverhtsend(black_sock, "Host:%s%c", argv[1], 10); // 10: refer to <Enter> keyhtsend(black_sock, "%c", 10);while(read(black_sock, bugs_bunny, 1) > 0) // read one byte every time{printf("%c", bugs_bunny[0]); // print data from server}close(black_sock); // close socketprintf("\n"); }

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