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              #include <gtk/gtk.h> int main (int argc, char *argv[]) {     GtkWidget *window;     GtkWidget *label;     gtk_init (&argc, &argv);     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);     gtk_window_set_title (GTK_WINDOW (window), "Hello World");     g_signal_connect(window, "destroy", G_CALLBACK (gtk_main_quit), NULL);     label = gtk_label_new ("Hello, World");     gtk_container_add (GTK_CONTAINER (window), label);     gtk_widget_show_all (window);     gtk_main ();     return 0; } 这是C语言调用gtk函数库显示窗口的代码。这个只能在Linux下运行。 代码行数比调用Windows API的少了几十行呢              
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