基于Glib的网络实现示例

Glib简介

Glib库是C语言的好伙伴,整体设计的非常好!
但是,Glib的例子非常少. 不容易学习和借鉴.
这里的例子就是采用glib的高层网络API实现的TCP服务端和客户端.

以下实例都是正常运行的代码

TCP服务端代码实例:

#include <glib.h>#include <gio/gio.h>gchar *buffer;gbooleannetwork_read(GIOChannel *source,            GIOCondition cond,            gpointer data){  GString *s = g_string_new(NULL);    //error should be inited with NULL  GError *error=NULL;  GIOStatus ret = g_io_channel_read_line_string(source, s, NULL, &error);  if (ret == G_IO_STATUS_ERROR){    g_error ("Error reading: %s\n", error->message);    g_object_unref(data);    return FALSE;    }  else if (ret == G_IO_STATUS_EOF){        g_print("finished\n");        return FALSE;    }else{    g_print("Got: %s\n", s->str);    //you should return this    return TRUE;    }}gbooleannew_connection(GSocketService *service,              GSocketConnection *connection,              GObject *source_object,              gpointer user_data){    // tell glib not to disconnect    g_object_ref(connection);  GSocketAddress *sockaddr = g_socket_connection_get_remote_address(connection, NULL);  GInetAddress *addr = g_inet_socket_address_get_address(G_INET_SOCKET_ADDRESS(sockaddr));  guint16 port = g_inet_socket_address_get_port(G_INET_SOCKET_ADDRESS(sockaddr));  g_print("New Connection from %s:%d\n", g_inet_address_to_string(addr), port);  GSocket *socket = g_socket_connection_get_socket(connection);  gint fd = g_socket_get_fd(socket);  GIOChannel *channel = g_io_channel_unix_new(fd);  //g_io_add_watch(channel, G_IO_IN, (GIOFunc) network_read, NULL);  g_io_add_watch(channel, G_IO_IN, (GIOFunc) network_read, connection);  return TRUE;}int main(int argc, char **argv) {  GSocketService *service = g_socket_service_new();  GInetAddress *address = g_inet_address_new_from_string("127.0.0.1");  GSocketAddress *socket_address = g_inet_socket_address_new(address, 4000);  g_socket_listener_add_address(G_SOCKET_LISTENER(service), socket_address, G_SOCKET_TYPE_STREAM,          G_SOCKET_PROTOCOL_TCP, NULL, NULL, NULL);  g_object_unref(socket_address);  g_object_unref(address);  g_socket_service_start(service);  g_signal_connect(service, "incoming", G_CALLBACK(new_connection), NULL);  GMainLoop *loop = g_main_loop_new(NULL, FALSE);  g_main_loop_run(loop);}

TCP客户端代码实例:

#include <glib.h>#include <gio/gio.h>#include <stdio.h>#include <string.h>int main(int argc, char *argv[]){    GError *error = NULL;    GSocketClient * client = g_socket_client_new();    //GSocketConnection * connection = g_socket_client_connect_to_host (client,"10.9.27.15",5000,NULL,&error);    GSocketConnection * connection = g_socket_client_connect_to_host (client,"localhost",9100,NULL,&error);    if (error){        g_error(error->message);    }else{        g_message("Connection ok");    }    guint8 buffer[]={170, 255, 255, 1, 204, 125, 128};    guint8 incoming_buff[100]={0};    GInputStream * in_stream = g_io_stream_get_input_stream(G_IO_STREAM(connection));    GOutputStream * out_stream = g_io_stream_get_output_stream(G_IO_STREAM(connection));    g_output_stream_write(out_stream, buffer, 7, NULL, &error);    int incoming_num = g_input_stream_read(in_stream,incoming_buff,100,NULL,&error);    if(error)        g_error(error->message);    else{        int i=0;         printf("incoming:\n");        for(;i<incoming_num;i++)            printf("%hhX ",incoming_buff[i]);        printf("\n");        //g_message(incoming_buff);    }    return TRUE;}