我有一个 main.c,它与一些头文件和其他 c 文件链接。完成程序后,它是一个基于终端的程序,它使用开关与用户输入一起工作。当我给它“o”时,它与硬件板相关联打开并“c”它关闭。
我得到了一个用 c 语言编写的带有打开关闭和退出按钮的示例 GTK+ gui 代码。我如何将我的打开和关闭功能与 gui 中的打开和关闭按钮链接起来。
这是我拥有的 GTK 代码
#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;
}
最佳答案
行内
g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
您正在“连接”一个“信号处理程序”:指定何时 button
被点击(即它发出 "clicked"
信号),函数 print_hello()
应该被调用。
只需替换print_hello()
使用您的打开或关闭功能,在打开或关闭按钮的适当调用中。
编辑:将参数传递给函数
信号处理程序应具有以下形式的原型(prototype):
void signal_handler (GtkButton *button, void *user_data)
button
参数获取被点击的按钮,user_data
获取您指定为 g_signal_connect()
的最后一个参数的任何内容-- 在这种情况下,NULL
.
如果要将参数传递给打开或关闭函数,则必须编写一个适配器函数,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()
连接起来而不是 print_hello
:
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,也可以是全局变量。您还可以通过 user_data
获取这些参数的值的方式连接信号。信号处理程序中的参数。在不了解您的打开和关闭功能的情况下,很难说您是否需要这样做。
关于在 GTK+ gui 中调用外部函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19087725/