在Linux下使用libunique实现单实例

Hello！ Here ‘s a fairly simple example of how to create single instance Applications with LibUnique and Gtk +. I took the example in the documentation and changed it to demonstrate how to pass a parameter to the active instance.How to compile:gcc -o uniquesample uniquesample.c `pkg-config --cflags gtk+-2.0 unique-1.0 --libs gtk+-2.0 unique-1.0`How to run it, first launch first instance:# ./uniquesample
Then, launch the others:# ./uniquesample "One App to rule them All"
Here’s the code:#include gtk/gtk.h
#include unique/unique.hstatic UniqueResponse
message_received_cb （UniqueApp *app,
                     UniqueCommand command,
                     UniqueMessageData *message,
                     guint time_,
                     gpointer user_data）
{
UniqueResponse res; /* get text payload from the unique message data*/
gchar *texto = unique_message_data_get_text （message）; /* Get the label widget */
GtkLabel *label = GTK_LABEL （user_data）; switch （command）
{
    case UNIQUE_ACTIVATE:
      {
        gtk_label_set_text （GTK_LABEL （label）, texto）;
        res = UNIQUE_RESPONSE_OK;
        break;
      }
    default:
      res = UNIQUE_RESPONSE_OK;
      break;
} return res;
}static gboolean
delete_event_cb （GtkWidget *widget, GdkEvent *event, gpointer data）
{
gtk_main_quit （）;
}int
main （int argc, char *argv[]）
{
gtk_init （&argc, &argv）; /* Create the UniqueApp Instance */
UniqueApp *app = unique_app_new （"home.myapp", NULL）; /* check if there already is an instance running */
if （unique_app_is_running （app））
{
    if （argc > 1）
    {
      /* build a message with the first command line argument */
      UniqueMessageData *message = unique_message_data_new（）;
      unique_message_data_set_text （message, argv[1], -1）;      /* send the message, we don"t care about the response */
      unique_app_send_message （app, UNIQUE_ACTIVATE, message）;      unique_message_data_free （message）;
      g_object_unref （app）;
    }
}
else
{
    /* this is the first instance */
    GtkWidget *window = gtk_window_new （GTK_WINDOW_TOPLEVEL）;
    GtkWidget *label = gtk_label_new （"UNIQUE INSTANCE"）;    /* Makes app "watch" a window.
     * Every watched window will receive startup notification changes automatically
     */
    unique_app_watch_window （app, GTK_WINDOW （window））;    /* connect to the signal so we can handle commands and responses
     * We are passing the label widget here as user data */
    g_signal_connect （G_OBJECT （app）, "message-received",
                      G_CALLBACK （message_received_cb）, label）;    g_signal_connect （G_OBJECT （window）, "delete_event",
                      G_CALLBACK （delete_event_cb）, NULL）;    gtk_widget_set_size_request （GTK_WIDGET （window）, 300, 200）;    gtk_container_add （GTK_CONTAINER （window）, label）;
    gtk_widget_show_all（window）;    gtk_main （）;    g_object_unref （app）;
} return 0;
}