在gtk中的对话框中打印输入框的值c [英] Printing value of entry box in a dialog in gtk c

问题描述

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（像这里 ）。但是，与链接中的解决方案不同，该程序会压缩（在第二次回调中，当我尝试使用从参数获取的小部件时）。

这是我的代码为此：

  #include< gtk / gtk.h> 
 #include< stdlib.h> 
 #include< stdio.h> 
 
 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 *对话框; 
 GtkWidget * content_area; 
 GtkWidget * grid; 
 GtkWidget * label; 
 GtkWidget *按钮; 
 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（文本框，<值>）; 
 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 *按钮; 
 GtkWidget *条目; 
 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状态; 
 
 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）; 
 
返回状态; 
} 
  

程序应该已经打印出了对话框之后的输入框的值关闭对话框。注意：在主窗口中有一个可打开对话框的按钮。

感谢您的帮助！ 解决方案

问题出在 print_text 函数上。 GtkDialog响应信号的原型是：

$ b

void user_function（GtkDialog *对话框，
gint response_id，
gpointer user_data）

所以你必须改变你的函数：

  static void print_text（GtkWidget *小部件，gint response_id，gpointer数据）
 {
 GtkEntry * entry = data; 
 printf（％s，gtk_entry_get_text（entry））; 
 gtk_widget_destroy（widget）; //这将关闭对话框
} 
  

I have worked recently with gtk+ in c language.

I have tried to communicate between two callbacks in a dialog and not in the main window (like here). But, unlike the solutions in the link, the program crushes (in the second callback when I try to use the widget I get from the parameters).

This is my code for This:

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

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, "<Value>");
    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;
}

The program should have printed the value of the entry box which in the dialog after closing the dialog. Note: in the main window there is a button that opens the dialog.

Thanks for helping!

解决方案

Problem is on the print_text function. The prototype for GtkDialog response signal is:

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

So you must change your function to:

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
}

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