Glade 3和C，按钮和文本框的信号处理

Question

我是Glade的初学者，但在C编程方面有经验。

我想建立一个接受两个值并显示总和的项目。

我已经使用下列内容：

textbox1 - (entry1) ---- for first value, 
textbox2 - (entry2) ---- for 2nd value, 
textbox3 - (entry3) ---- to display result, 
button - (button1) ---- to calculate sum, 
signal - (on_button1_clicked) ---- to handle sum function. 

请帮助我的信号码。

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

    GtkBuilder *builder; 
    GtkWidget *window; 
    GError  *error = NULL; 

void on_button1_clicked 
{ 

// Need Help in this section 

} 

void on_window1_destroy (GtkObject *object, gpointer user_data) 
{ 
gtk_main_quit(); 
} 

int main(int argc, char **argv) 
{ 

    /* Init GTK+ */ 
    gtk_init(&argc, &argv); 

    /* Create new GtkBuilder object */ 
    builder = gtk_builder_new(); 
    /* Load UI from file. If error occurs, report it and quit application. 
    * Replace "tut.glade" with your saved project. */ 
    if(! gtk_builder_add_from_file(builder, "sum.glade", &error)) 
    { 
     g_warning("%s", error->message); 
     g_free(error); 
     return(1); 
    } 

    /* Get main window pointer from UI */ 
    window = GTK_WIDGET(gtk_builder_get_object(builder, "window1")); 

    /* Connect signals */ 
    gtk_builder_connect_signals(builder, NULL); 

    /* Destroy builder, since we don't need it anymore */ 
    g_object_unref(G_OBJECT(builder)); 

    /* Show window. All other widgets are automatically shown by GtkBuilder */ 
    gtk_widget_show(window); 

    /* Start main loop */ 
    gtk_main(); 

    return(0); 
} 

Answer 1

我尝试了一些东西，并有一些帮助可以使它工作。这里是你需要参考的内容Click

Answer 2

我不会告诉你到底该怎么做，而是通过你的问题的思维逻辑：你需要

1. 获取文本出来的entry1和entry2
2. 将字符串转换为整数。
3. 添加在一起
4. 答案转换为字符串
5. 设置文本上entry3

我敢肯定，你可以找到一些有用的功能做的这个GTK +的部分文档中： GtkEntry documentation

Answer 3

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

/*i have grouped all the widgets in one structure. this technique will 
help if you have huge number of windows in your project. 
as the number of window will increase the variable we declare will increase 
and the declared variables can have same name of different windows */ 
struct login_window 
{ 
    GtkEntry *e1;//textbox1 
    GtkEntry *e2;//textbox2 
    GtkEntry *e3;//textbox3 
}; 
typedef struct login_window widgets; 


G_MODULE_EXPORT void on_window1_destroy() 
{ 
    gtk_main_quit(); 
} 


G_MODULE_EXPORT void on_button1_clicked (GtkButton *button,widgets *widg) 
{ 
    char ch1[5],ch2[5],ch[5]; 
    int a; 
//getting text from the text boxes 
const gchar *text1 = gtk_entry_get_text(widg->e2); 
const gchar *text2 = gtk_entry_get_text(widg->e1); 

//copying the text of textbox into an array 
strcpy(ch1,text1); 
strcpy(ch2,text2); 

//converting characters to integer and adding them 
a=(atoi(ch1))+(atoi(ch2)); 

itoa(a,ch,5);//converting integer to character 
gtk_entry_set_text (widg->e3,ch);//setting or displaying text(output) to the third text box 
} 

int main(int argc, char *argv[]) 
{ 
    GtkBuilder *gtkBuilder; 
    widgets widg; 
    GtkWidget *window; 

    gtk_init(&argc, &argv); 
    gtkBuilder = gtk_builder_new(); 

    gtk_builder_add_from_file(gtkBuilder, "window.glade", NULL); 


    window = GTK_WIDGET(gtk_builder_get_object(gtkBuilder, "window1")); 

//connecting each structure member to it appropriate gtkwidget 
    widg.e1 = GTK_ENTRY(gtk_builder_get_object(gtkBuilder, "entry1")); 
    widg.e2 = GTK_ENTRY(gtk_builder_get_object(gtkBuilder, "entry2")); 
    widg.e3 = GTK_ENTRY(gtk_builder_get_object(gtkBuilder, "entry3")); 

/*connecting signals so that appropriate handlers can be called when button is clicked*/ 
    gtk_builder_connect_signals(gtkBuilder, &widg); 

    g_object_unref(G_OBJECT(gtkBuilder)); 
    gtk_widget_show(window);//showing the window 
    gtk_main(); 

    return 0; 
}