c - Webkit GTK::如何检测下载何时完成？

Question

我想知道是否有办法知道 webkit 下载何时完成且没有错误。我正在使用 C API。我希望会发出一个信号(类似于下载开始时)，但事实似乎并非如此。

搜索 webkit API 索引，我看不到任何相关的信号: http://webkitgtk.org/reference/index-all.html

我真的必须轮询每个 webkit 下载直到它完成吗？

干杯

Answer 1

下载完成后会发出一个信号。信号是WebKitWebView“load-finished”，你也可以在对象WebKitWebView中监听“load-status”的属性变化。

以下 C 代码向您展示了如何:

  #include <gtk/gtk.h>
  #include <webkit/webkit.h>

  static void destroy_cb(GtkWidget* widget, gpointer data) {
    gtk_main_quit();
  }

  static void load_finished_cb(WebKitWebView *web_view, WebKitWebFrame *web_frame, gpointer data) {
      printf("Finished downloading %s\n", webkit_web_view_get_uri(web_view));
  }

  static void load_status_cb(GObject* object, GParamSpec* pspec, gpointer data) {
      WebKitWebView *web_view;
      WebKitLoadStatus status;
      const gchar *uri;

      web_view = WEBKIT_WEB_VIEW(object);
      status = webkit_web_view_get_load_status(web_view);
      uri = webkit_web_view_get_uri(web_view);

      switch (status) {
      case WEBKIT_LOAD_PROVISIONAL:
          printf("Load provisional: %s\n", uri);
          break;
      case WEBKIT_LOAD_COMMITTED:
          printf("Load commited: %s\n", uri);
          break;
      case WEBKIT_LOAD_FIRST_VISUALLY_NON_EMPTY_LAYOUT:
          printf("Load first visually non empty layout: %s\n", uri);
          break;
      case WEBKIT_LOAD_FINISHED:
          printf("Load finished: %s\n", uri);
          break;
      default:
          g_assert_not_reached();
      }
  }

  int main(int argc, char* argv[]) {
    const char *uri;
    GtkWidget* window;
    WebKitWebView* web_view;

    gtk_init(&argc, &argv);

    if (argc == 1) {
        printf("Usage: URI\n");
        return 1;
    }
    uri = argv[1];

    if(!g_thread_supported())
      g_thread_init(NULL);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size(GTK_WINDOW(window), 600, 400);
    g_signal_connect(window, "destroy", G_CALLBACK(destroy_cb), NULL);

    web_view = web_view = WEBKIT_WEB_VIEW(webkit_web_view_new());
    webkit_web_view_set_transparent(web_view, TRUE);

    /* Register a callback that gets invoked each time that a page is finished downloading */
    g_signal_connect(web_view, "load-finished", G_CALLBACK(load_finished_cb), NULL);

    /* Register a callback that gets invoked each time that the load status changes */
    g_object_connect(web_view, "signal::notify::load-status", G_CALLBACK(load_status_cb), NULL);

    webkit_web_view_load_uri(web_view, uri);

    gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(web_view));
    gtk_widget_grab_focus(GTK_WIDGET(web_view));
    gtk_widget_show_all(window);
    gtk_main();
    return 0;
  }