c - 如何在 GTK3 窗口中打印仅终端命令的输出？

Question

我有以下 GTK3 代码:

#include <gtk/gtk.h>

void show(GtkWidget *window, gpointer ptr) {}

void activate(GtkApplication *tmp, gpointer ptr) {

    GtkWidget *scrolled_window;
    GtkWidget *window;
    GtkWidget *button_box;
    GtkWidget *button;
    GtkWidget *box;
    GtkWidget *view;
    GtkTextBuffer *buffer;

    window = gtk_application_window_new(tmp);

    gtk_window_set_title(GTK_WINDOW(window), "tmp");
    gtk_window_set_default_size(GTK_WINDOW(window), 500, 500);
    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);

    scrolled_window = gtk_scrolled_window_new(NULL, NULL);

    buffer = gtk_text_buffer_new(NULL);

    view = gtk_text_view_new_with_buffer(buffer);

    gtk_widget_set_margin_start(view, 10);
    gtk_widget_set_margin_end(view, 10);
    gtk_widget_set_margin_top(view, 10);
    gtk_widget_set_margin_bottom(view, 10);

    gtk_text_view_set_editable(GTK_TEXT_VIEW(view), FALSE);
    gtk_text_view_set_cursor_visible(GTK_TEXT_VIEW(view), FALSE);
    gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(view), GTK_WRAP_WORD);

    button = gtk_button_new_with_label("Show");

    button_box = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL);

    gtk_widget_set_halign(button_box, GTK_ALIGN_END);
    gtk_widget_set_valign(button_box, GTK_ALIGN_END);
    gtk_widget_set_margin_start(button_box, 10);
    gtk_widget_set_margin_end(button_box, 10);
    gtk_widget_set_margin_top(button_box, 0);
    gtk_widget_set_margin_bottom(button_box, 10);

    box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);

    gtk_box_pack_start(GTK_BOX(box), scrolled_window, TRUE, TRUE, 0);
    gtk_box_pack_start(GTK_BOX(box), button_box, FALSE, FALSE, 0);

    gtk_container_add(GTK_CONTAINER(scrolled_window), view);
    gtk_container_add(GTK_CONTAINER(button_box), button);
    gtk_container_add(GTK_CONTAINER(window), box);

    g_signal_connect(button, "clicked", G_CALLBACK(show), NULL);

    gtk_widget_show_all(window);
}

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

    GtkApplication *tmp;
    int status;

    tmp = gtk_application_new("org.gtk.tmp", G_APPLICATION_FLAGS_NONE);
    g_signal_connect(tmp, "activate", G_CALLBACK(activate), NULL);
    status = g_application_run(G_APPLICATION(tmp), argc, argv);
    g_object_unref(tmp);

    return status;
}

我的问题是:单击“运行”后，如何在此窗口中打印仅终端命令(如“ps aux”)的输出？

我从来没有用 GTK3 写过任何东西，所以请不要指给我 https://developer.gnome.org/gtk3/stable/因为它是引用而不是教程，所以要使用它，需要已经了解一些 GTK3。

提前致谢!

Answer 1

我不会用解决方案复制上面的代码(我已经修改了两次以添加我提出问题后学到的知识)，而是粘贴它与代码的最终版本之间的差异:

 3c3,14
< void show(GtkWidget *window, gpointer ptr) {}
---
> void show(GtkWidget *window, gpointer buffer) {
> 
>   gchar *argv[] = { "/bin/df", "--human-readable", NULL };
>   gchar *output;
>   gchar *error;
> 
>   gtk_text_buffer_set_text(buffer, "", -1);
> 
>   g_spawn_sync(NULL, argv, NULL, G_SPAWN_DEFAULT, NULL, NULL, &output, &error, NULL, NULL);
> 
>   gtk_text_buffer_insert_at_cursor(buffer, output, -1);
> }
56c67
<     g_signal_connect(button, "clicked", G_CALLBACK(show), NULL);
---
>     g_signal_connect(button, "clicked", G_CALLBACK(show), buffer);

(感谢busybee的宝贵指点!)

此解决方案的缺点是，您运行的命令的输出不会实时传递，而是仅在命令完成时传递。因此，如果需要 30 秒才能完成，您的 GUI 将在 30 秒内不显示任何内容，然后一次性打印所有内容。我读过https://developer.gnome.org/gio/stable/GSubprocess.html可能是答案，但我还没有检查过。