创建并发出信号GTK [英] create and emit gtk signal

问题描述

我想创建并发出一个信号GTK：

I am trying to create and emit a GTK signal:

g_signal_new("child-finished",
    G_TYPE_OBJECT,
    G_SIGNAL_RUN_FIRST,
    0,
    NULL, NULL,
    NULL,           // *** I think this is where I need to change it
    G_TYPE_NONE, 0);
g_signal_connect(G_OBJECT(myWindow), "child-finished", G_CALLBACK(MyCallback), NULL);

下面是我的code发出信号：

Here is my code that emits the signal:

gtk_signal_emit_by_name(referenceToMyWindow, "child-finished");

这是我的code处理该信号：

And here is my code that handles the signal:

void MyCallback(GtkWidget *w, GdkEvent *e)
{
    // handler code here
}

当我运行code我得到以下错误：

When I run the code I get the following error:

GLib的-的GObject-CRITICAL **：摹 _closure _ 调用：断言`closure->元帅|| closure-> meta_marshal'失败

GLib-GObject-CRITICAL **: g_closure_invoke: assertion `closure->marshal || closure->meta_marshal' failed

我知道它是与传递一个编组到 g_signal_new 的功能，但我不知道编组是什么，我不明白<一个HREF =htt​​p://library.gnome.org/devel/gobject/unstable/gobject-Closures.html#GClosureMarshal相对=nofollow>文档和在线的例子是少之又少。我如何声明和连接我自己的信号？

I know it has something to do with passing a marshaller to the g_signal_new function, but I don't know what a marshaller is, I can't understand the documentation, and the examples online are few and far between. How do I declare and connect my own signal?

推荐答案

GObject的库提供了一些的内置marshallers 的，所以你的code可能应该：

The GObject library provides some builtin marshallers, so your code should probably be:

g_signal_new("child-finished",
             G_TYPE_OBJECT, G_SIGNAL_RUN_FIRST,
             0, NULL, NULL,
             g_cclosure_marshal_VOID__POINTER,
             G_TYPE_NONE, 1, G_TYPE_POINTER);

或者，如果你想要的类型检查：

or, if you want type checking:

g_signal_new("child-finished",
             G_TYPE_OBJECT, G_SIGNAL_RUN_FIRST,
             0, NULL, NULL,
             g_cclosure_marshal_VOID__BOXED,
             G_TYPE_NONE, 1, GDK_TYPE_EVENT);

信号处理函数的参数必须是present（itsself隐含的对象），所以一定要指定一个指针（如在第一个例子）或盒装类型（如在第二个例子）。

The parameters of the signal handler must be present (the object itsself is implied), so be sure to specify a pointer (as in the first example) or a boxed type (as in the second example).

如果您需要的编组是不是在那些建宏present，您可以使用的巧舌如簧-genmarshal 实用程序或直接code它自己（这是很微不足道的，只是签巧舌如簧，genmarshal的输出）。

If the marshaller you need is not present in the builtins ones, you could use the glib-genmarshal utility or directly code it by yourself (it is quite trivial, just checkout the output of glib-genmarshal).

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