Question

我正在尝试将对象传递给“clicked”事件的回调，以便设置目标标签的文本。

到目前为止，这是我的代码：

#include <gtk/gtk.h>

typedef struct {
    int i;
    GtkWidget *target;
} Data;

void change( GtkWidget *widget,
             Data      *data )
{
    gtk_label_set_text(GTK_LABEL(data->target), "it did!");
}

int main( int   argc,
          char* argv[] )
{
    gtk_init(&argc, &argv);

    GtkWidget *window, *label, *button;

    Data data;
    data.i = 0;
    data.target = label;

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "GTKdemo");
    g_signal_connect(window, "delete-event", G_CALLBACK(gtk_main_quit), NULL);

    GtkGrid *grid = gtk_grid_new();

    button = gtk_button_new_with_label("Click here");
    g_signal_connect(button, "clicked", G_CALLBACK(change), &data);
    gtk_grid_attach(grid, button, 0,0,1,1);

    label = gtk_label_new("this will change");
    gtk_grid_attach(grid, label, 0,1,1,1);
    gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(grid));

    gtk_widget_show_all(window);

    gtk_main();

    return 0;
}

我在点击label时尝试设置button的文字。我试过gtk callback multiple arguments但没有骰子。帮助

Answer 1

好的，我通过移动data.target = label来修复它，以便在按钮的g_signal_connect之后执行。也许问题产生于在定义对象变量之前使用指针地址。

如何将对象传递给GTK3回调？

1 个答案: