Question

我有一个main.c，它与一些标题和其他c文件链接。完成程序后，它是一个基于终端的程序，使用switch与用户输入一起工作。当我给出“o”时，它与硬件板相关联打开，“c”关闭。

我有一个用c语言编写的示例GTK + gui代码，带有开放的cloase和quit按钮。如何将我的打开和关闭功能与gui中的open和cloase按钮链接。

这是GTK Code am Having

#include <gtk/gtk.h>

static void
print_hello (GtkWidget *widget,
             gpointer   data)
{
    g_print ("Hello World\n");
}

int
main (int   argc,
      char *argv[])
{
    GtkWidget *window;
    GtkWidget *grid;
    GtkWidget *button;

    /* This is called in all GTK applications. Arguments are parsed
     * from the command line and are returned to the application.
     */
    gtk_init (&argc, &argv);

    /* create a new window, and set its title */
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title (GTK_WINDOW (window), "CANMate");
    g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
    gtk_container_set_border_width (GTK_CONTAINER (window), 50);

    /* Here we construct the container that is going pack our buttons */
    grid = gtk_grid_new ();

    /* Pack the container in the window */
    gtk_container_add (GTK_CONTAINER (window), grid);

    button = gtk_button_new_with_label ("Open");
    g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);

    /* Place the first button in the grid cell (0, 0), and make it fill
     * just 1 cell horizontally and vertically (ie no spanning)
     */
    gtk_grid_attach (GTK_GRID (grid), button, 0, 0, 1, 1);

    button = gtk_button_new_with_label ("Close");
    g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);

    /* Place the second button in the grid cell (1, 0), and make it fill
     * just 1 cell horizontally and vertically (ie no spanning)
     */
    gtk_grid_attach (GTK_GRID (grid), button, 1, 0, 1, 1);

    button = gtk_button_new_with_label ("Quit");
    g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);

    /* Place the Quit button in the grid cell (0, 1), and make it
     * span 2 columns.
     */
    gtk_grid_attach (GTK_GRID (grid), button, 0, 1, 2, 1);

    /* Now that we are done packing our widgets, we show them all
     * in one go, by calling gtk_widget_show_all() on the window.
     * This call recursively calls gtk_widget_show() on all widgets
     * that are contained in the window, directly or indirectly.
     */
    gtk_widget_show_all (window);

    /* All GTK applications must have a gtk_main(). Control ends here
     * and waits for an event to occur (like a key press or a mouse event),
     * until gtk_main_quit() is called.
     */
    gtk_main ();

    return 0;
}

Answer 1

在第

行

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

您正在“连接”“信号处理程序”：指定单击button时（即，它发出"clicked"信号），应调用函数print_hello()。

只需在打开或关闭按钮的相应调用中，用您的打开或关闭功能替换print_hello()。

编辑：将参数传递给函数

信号处理程序应该具有以下形式的原型：

void signal_handler (GtkButton *button, void *user_data)

button参数获取点击的按钮，user_data获取您指定为g_signal_connect()的最后一个参数的任何内容 - 在本例中为NULL。< / p>

如果要将参数传递给open或close函数，则必须编写适配器函数，如下所示：

void
on_open_click (GtkButton *open_button, void *user_data)
{
    if (my_open_function (my_parameter_1, my_parameter_2) == UH_OH_ERROR) {
        fprintf(stderr, "Something went wrong.\n");
}

然后将其与g_signal_connect()而不是print_hello连接：

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

在这种情况下，my_parameter_1和my_parameter_2可以是文字值或全局变量。您还可以通过信号处理程序中的user_data参数获取这些参数的值来连接信号。很难说你是否需要这样做，而不了解你的开放和关闭功能。

在GTK + gui中调用外部函数

1 个答案: