virt-viewer源码分析

本文主要是针对spice的基础上对virt-viewer进行分析，使用这款软件的主要命令就是remote-viewer这个命令，因此本文在此主要分析的文件就是remote-viewer-main.c文件，spice编程方式基本上都是使用c语言实现面向对象的编程方式安装好软件后使用remote-viewer命令,然后在对话框中的输入：spice://172.16.1.134?port=9004;

然后点击连接就会链接到服务器端了实现远程登录，如下图所示:

 #include <config.h>//主要是程序中的一些开关的定义，通过#define 来定义实现某些功能的裁剪，这个文件在virt-viewer源码下#include <locale.h>#include <gtk/gtk.h>#include <glib/gi18n.h>#include <stdlib.h>#ifdef G_OS_WIN32#include <windows.h>#include <io.h>#endif#ifdef HAVE_GTK_VNC#include <vncdisplay.h>#endif#ifdef HAVE_SPICE_GTK   //spice-gtk的使能在config.h中#include <spice-option.h>//主要调用spice的操作选项spice_set_session_option这个函数 设置spice session选项，一些功能的使能，比如usbredir#endif#ifdef HAVE_OVIRT#include <govirt/ovirt-options.h>#endif#include "remote-viewer.h"#include "virt-viewer-app.h"#include "virt-viewer-session.h"static voidremote_viewer_version(void)//显示本系统版本好，在config.h中是有定义的，本文件是2.0 版本{    g_print(_("remote-viewer version %s\n"), VERSION BUILDID);    exit(EXIT_SUCCESS);}static voidrecent_add(gchar *uri, const gchar *mime_type){    GtkRecentManager *recent;    GtkRecentData meta = {        .app_name     = (char*)"remote-viewer",        .app_exec     = (char*)"remote-viewer %u",        .mime_type    = (char*)mime_type,    };    if (uri == NULL)        return;    recent = gtk_recent_manager_get_default();    meta.display_name = uri;    if (!gtk_recent_manager_add_full(recent, uri, &meta))        g_warning("Recent item couldn't be added");}static void connected(VirtViewerSession *session,                      VirtViewerApp *self G_GNUC_UNUSED){    gchar *uri = virt_viewer_session_get_uri(session);    const gchar *mime = virt_viewer_session_mime_type(session);    recent_add(uri, mime);    g_free(uri);}intmain(int argc, char **argv){    GOptionContext *context;//这是glib中对输入参数的解析，并没有直接利用判断    GError *error = NULL;    int ret = 1;    gchar **args = NULL;    gchar *uri = NULL;    char *title = NULL;    RemoteViewer *viewer = NULL;#ifdef HAVE_SPICE_GTK //同样检测spice-gtk的时能情况,在config.h中有定义    gboolean controller = FALSE;//关闭controller#endif    VirtViewerApp *app;    const GOptionEntry options [] = {//GOptionEntry就是GLib提供一个方便我们设置输入参数的结构的，例如 cd /home        { "version", 'V', G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,          remote_viewer_version, N_("Display version information"), NULL },//显示参数-V的作用即 virt-viewer -V,显示相关的信息        { "title", 't', 0, G_OPTION_ARG_STRING, &title,          N_("Set window title"), NULL },#ifdef HAVE_SPICE_GTK        { "spice-controller", '\0', 0, G_OPTION_ARG_NONE, &controller,          N_("Open connection using Spice controller communication"), NULL },#endif        { G_OPTION_REMAINING, '\0', 0, G_OPTION_ARG_STRING_ARRAY, &args,          NULL, "URI|VV-FILE" },        { NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL }    };    GOptionGroup *app_options = NULL;    virt_viewer_util_init(_("Remote Viewer"));//初始化相关的remote选项    /* Setup command line options */    context = g_option_context_new (NULL);//重设命令行    g_option_context_set_summary(context, _("Remote viewer client"));    app_options = virt_viewer_app_get_option_group();    g_option_group_add_entries (app_options, options);    g_option_context_set_main_group (context, app_options);    g_option_context_add_group (context, gtk_get_option_group (TRUE));#ifdef HAVE_GTK_VNC    g_option_context_add_group (context, vnc_display_get_option_group ());#endif#ifdef HAVE_SPICE_GTK    g_option_context_add_group (context, spice_get_option_group ());#endif#ifdef HAVE_OVIRT    g_option_context_add_group (context, ovirt_get_option_group ());#endif    g_option_context_parse (context, &argc, &argv, &error);//获取context内的参数    if (error) {        char *base_name;        base_name = g_path_get_basename(argv[0]);        g_printerr(_("%s\nRun '%s --help' to see a full list of available command line options\n"),                   error->message, base_name);        g_free(base_name);        g_error_free(error);        goto cleanup;    }    g_option_context_free(context);#ifdef HAVE_SPICE_GTK    if (controller) {        if (args) {            g_printerr(_("Error: extra arguments given while using Spice controller\n"));            goto cleanup;        }    } else#endif    if (args) {        if (g_strv_length(args) > 1) {            g_printerr(_("Error: can't handle multiple URIs\n"));            goto cleanup;        } else if (g_strv_length(args) == 1) {            uri = g_strdup(args[0]);        }    }#ifdef HAVE_SPICE_GTK    if (controller) {        viewer = remote_viewer_new_with_controller();        g_object_set(viewer, "guest-name", "defined by Spice controller", NULL);    } else {#endif        viewer = remote_viewer_new(uri);        if (title)            g_object_set(viewer, "title", title, NULL);#ifdef HAVE_SPICE_GTK    }#endif    if (viewer == NULL)        goto cleanup;    app = VIRT_VIEWER_APP(viewer);    if (!virt_viewer_app_start(app))        goto cleanup;    g_signal_connect(virt_viewer_app_get_session(app), "session-connected",                     G_CALLBACK(connected), app);    gtk_main();    ret = 0; cleanup:    g_free(uri);    if (viewer)        g_object_unref(viewer);    g_strfreev(args);    return ret;}