GTK 环境编写的hello world ,另外 两个按钮分别实现读写文件

#include <gtk/gtk.h>
#include <stdio.h>

static void on_button_read()
{
    FILE *f;
    /*不同的电脑，文件路径可能要改动*/
    if((f = fopen("/home/manyikaimen/leo/liyang.txt","w")) == NULL)
    {
        g_printf("open file failed!n");
    }
    else
    {
        fclose(f);
          g_printf("button_read was pressed,and we have open the filen");
    }
    

}

static void on_button_write()
{
    FILE *f;
    char *p = "hello this world";
    /*不同的电脑，文件路径可能要改动*/
    if((f=fopen("/home/manyikaimen/leo/liyang.txt","w")) == NULL)
    {
        g_printf("sorry,this file does not exist!");
    }
    else
    {
        fwrite(p, strlen(p), 1, f);
        fclose(f);
        g_printf("button_write was pressed,and we have write to the filen");
    }
    
    
}


static gboolean delete_event( GtkWidget *widget,
                              GdkEvent  *event,
                              gpointer   data )
{
    gtk_main_quit ();
    return FALSE;
}

int main( int   argc,
          char *argv[] )
{
    GtkWidget *window;
    GtkWidget *button_read;
    GtkWidget *button_write;
    GtkWidget *box1;

    gtk_init (&argc, &argv);

    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

    gtk_window_set_title (GTK_WINDOW (window), "Hello Buttons!");

    g_signal_connect (window, "delete-event",G_CALLBACK (delete_event), NULL);

    gtk_container_set_border_width (GTK_CONTAINER (window), 10);

    box1 = gtk_hbox_new (FALSE, 0);

    gtk_container_add (GTK_CONTAINER (window), box1);

    button_read = gtk_button_new_with_label ("read file");

    /*为打开按钮添加相应函数*/
    g_signal_connect (button_read, "clicked",G_CALLBACK (on_button_read), NULL);

    gtk_box_pack_start (GTK_BOX(box1), button_read, TRUE, TRUE, 0);

    gtk_widget_show (button_read);
    
    /*为写按钮添加事件相应函数*/
    button_write = gtk_button_new_with_label ("write file");

    g_signal_connect (button_write, "clicked",G_CALLBACK (on_button_write), NULL);

    gtk_box_pack_start(GTK_BOX (box1), button_write, TRUE, TRUE, 0);

    gtk_widget_show (button_write);

    gtk_widget_show (box1);

    gtk_widget_show (window);

    gtk_main ();

    return 0;
}

最后

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