在gtk c中的对话框中打印输入框的值

我最近用c语言的gtk +工作了。

我试图在对话框中的两个回调之间进行通信，而不是在主窗口中进行通信 （ 就像这里一样 ）。 但是，与链接中的解决方案不同，程序会崩溃（当我尝试使用从参数中获取的小部件时，在第二次回调中）。

这是我的代码：

#include  #include  #include  static void print_text (GtkWidget *widget, gpointer data) { GtkEntry* entry = data; printf("%s", gtk_entry_get_text(entry)); } static void open_dialog (GtkWidget *widget, gpointer data) { GtkWidget *window = data; GtkWidget *dialog; GtkWidget *content_area; GtkWidget *grid; GtkWidget *label; GtkWidget *button; static GtkEntry *textbox; dialog = gtk_dialog_new_with_buttons ("Get Text", window, GTK_DIALOG_MODAL, GTK_STOCK_OK, GTK_RESPONSE_OK, NULL); content_area = gtk_dialog_get_content_area (GTK_DIALOG (dialog)); grid = gtk_grid_new(); gtk_container_add (GTK_CONTAINER (content_area), grid); label = gtk_label_new("Value: "); gtk_grid_attach(GTK_GRID(grid), label, 0, 0, 1, 1); textbox = gtk_entry_new(); gtk_entry_set_text(textbox, ""); gtk_grid_attach(GTK_GRID(grid), textbox, 1, 0, 1, 1); gtk_widget_show_all (dialog); g_signal_connect (GTK_DIALOG (dialog), "response", G_CALLBACK (print_text), textbox); } static void activate (GtkApplication *app, gpointer user_data) { GtkWidget *window; GtkWidget *button; GtkWidget *entry; GtkWidget *grid; window = gtk_application_window_new (app); gtk_window_set_title (GTK_WINDOW (window), "Window"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); grid = gtk_grid_new (); gtk_container_add (GTK_CONTAINER (window), grid); button = gtk_button_new_with_label ("Print Text"); g_signal_connect (button, "clicked", G_CALLBACK (open_dialog), window); gtk_grid_attach (GTK_GRID (grid), button, 0, 1, 1, 1); gtk_widget_show_all (window); } int main (int argc, char **argv) { GtkApplication *app; int status; app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE); g_signal_connect (app, "activate", G_CALLBACK (activate), NULL); status = g_application_run (G_APPLICATION (app), argc, argv); g_object_unref (app); return status; } 

程序应该在关闭对话框后打印对话框中的输入框的值。 注意：在主窗口中有一个用于打开对话框的按钮。

谢谢你的帮助！

Answer 1

print_text函数存在问题。 GtkDialog响应信号的原型是：

void user_function（GtkDialog * dialog，gint response_id，gpointer user_data）

所以你必须将你的function改为：

 static void print_text (GtkWidget *widget, gint response_id, gpointer data) { GtkEntry* entry = data; printf("%s", gtk_entry_get_text(entry)); gtk_widget_destroy (widget); // This will close the dialog }