编译webkit/webview应用程序时出错--Vala/GTK

Question

我正在尝试使用Vala和GTK构建我的第一个基于webkit的应用程序.我对这些语言以及编译它们的过程都很陌生,所以任何帮助都会很棒.

这是我收到的错误:

/home/elementary/GTKProjects/Fookbase/src/fookbase_main.vala:2.7-2.12:错误:使用WebKit找不到命名空间名称"WebKit";

/home/elementary/GTKProjects/Fookbase/src/fookbase_main.vala:13.13-13.19:错误:无法找到类型名称"WebView"私有WebView web_view;

这是我的代码:

using Gtk;
using WebKit;

public class Fookbase : Window {

private const string TITLE = "Fookbase";
private const string HOME_URL = "http://fookbase.com";
private const string DEFAULT_PROTOCOL = "http";

private Regex protocol_regex;

private Entry url_bar;
private WebView web_view;
private Label status_bar;
private ToolButton back_button;
private ToolButton forward_button;
private ToolButton reload_button;

public Fookbase () {
    this.title = Fookbase.TITLE;
    set_default_size (500, 800);

    try {
        this.protocol_regex = new Regex (".*://.*");
    } catch (RegexError e) {
        critical ("%s", e.message);
    }

    create_widgets ();
    connect_signals ();
    this.url_bar.grab_focus ();
}

private void create_widgets () {
    var toolbar = new Toolbar ();
    this.back_button = new ToolButton.from_stock (Stock.GO_BACK);
    this.forward_button = new ToolButton.from_stock (Stock.GO_FORWARD);
    this.reload_button = new ToolButton.from_stock (Stock.REFRESH);
    toolbar.add (this.back_button);
    toolbar.add (this.forward_button);
    toolbar.add (this.reload_button);
    this.web_view = new WebView ();
    var scrolled_window = new ScrolledWindow (null, null);
    scrolled_window.set_policy (PolicyType.AUTOMATIC, PolicyType.AUTOMATIC);
    scrolled_window.add (this.web_view);
    this.status_bar.xalign = 0;
    var vbox = new VBox (false, 0);
    vbox.pack_start (toolbar, false, true, 0);
    vbox.pack_start (this.url_bar, false, true, 0);
    vbox.add (scrolled_window);
    vbox.pack_start (this.status_bar, false, true, 0);
    add (vbox);
}

private void connect_signals () {
    this.destroy.connect (Gtk.main_quit);
    this.url_bar.activate.connect (on_activate);
    this.web_view.title_changed.connect ((source, frame, title) => {
        this.title = "%s - %s".printf (title, Fookbase.TITLE);
    }); 
    this.web_view.load_committed.connect ((source, frame) => {
        this.url_bar.text = frame.get_uri ();
        update_buttons ();
    });
    this.back_button.clicked.connect (this.web_view.go_back);
    this.forward_button.clicked.connect (this.web_view.go_forward);
    this.reload_button.clicked.connect (this.web_view.reload);
}

private void update_buttons () {
    this.back_button.sensitive = this.web_view.can_go_back ();
    this.forward_button.sensitive = this.web_view.can_go_forward ();
}

private void on_activate () {
    var url = this.url_bar.text;
    if (!this.protocol_regex.match (url)) {
        url = "%s://%s".printf (Fookbase.DEFAULT_PROTOCOL, url);
    }
    this.web_view.open (url);
}

public void start () {
    show_all ();
    this.web_view.open (Fookbase.HOME_URL);
}

public static int main (string[] args) {
    Gtk.init (ref args);

    var browser = new Fookbase ();
    browser.start ();

    Gtk.main ();

    return 0;
  }
}

Answer 1

为了在Vala中使用库,您需要告诉编译器它.只是在代码中说"使用WebKit"是不够的.您可以通过将--pkg标志(带有所需的值)传递给valac.

几乎所有绑定的包的名称都与pkg-config名称匹配,因此Vala编译器可以自动确定要传递给C编译器和链接器的正确标志.要查看Vala中可用的软件包,您可以查看/usr/share/vala/vapi和/usr/share/vala-x.yz/vapi目录(后者特定于valac您正在使用的版本).Valadoc.org也有许多软件包的名称.我不确定您编写代码时的引用是什么,但通常它们会告诉您正在查看的包.

对于WebKit的,如果你正在写新的软件,你可能需要使用两种webkit2gtk-4.0或者webkit2gtk-web-extension-4.0,这是这对GTK + -3.0链接的软件包.

所以,像

valac --pkg webkit2gtk-4.0 ... your-file.vala