我是Linux Kernel开发人员，我们有一个运行Yocto Image的电路板，要求显示CISPR测试时显示“滚动H的全黑屏幕”。我正在为此使用GTK库，编写了一个示例代码，该代码空白了整个屏幕，并将“ Hello World”写到了中心。
#include <gtk/gtk.h>
int main (int argc, char *argv[])
{
GtkWidget *window;// GtkWidget is the storage type for widgets
GtkWidget *label;
gtk_init (&argc, &argv);// This is called in all GTK applications. Arguments are parsed
//from the command line and are returned to the application.
window=gtk_window_new(GTK_WINDOW_TOPLEVEL); //creating a new window.
label = gtk_label_new("Hello World");
gtk_label_set_justify(GTK_LABEL(label), GTK_JUSTIFY_LEFT);
gtk_container_add(GTK_CONTAINER(window), label);
gtk_window_set_decorated(GTK_WINDOW(window), FALSE);
GdkCursor* Cursor = gdk_cursor_new(GDK_BLANK_CURSOR);
GdkWindow* win = gtk_widget_get_window((window));
gdk_window_set_cursor((win),Cursor);
gtk_widget_show_all(window); //The final step is to display this newly created widget.
gtk_main (); //All GTK applications must have a gtk_main(). Control ends here
//and waits for an event to occur (like a key press or mouse event).
return 0;
}
由于我是GUI的新手，所以有人可以指导我使用什么小部件来获得滚动的H。