学习C语言及GTK界面编程经典实例修改： 计算器
推荐到我的邮箱 uunubt@yahoo.cn 00000000 直接去下在源码包，否则按下面步骤来也行哈
第一步，新建文件夹重命名为 ：ad
第二步，将下面文件 1： calc.glade 2： callbacks.c 3： callbacks.h 4： main.c 5： Makefile 6： Readme.txt 拷贝到ad路径下
第三步，进入ad路径下编译执行(当然该装的工具不能少） make ./calc 后结果如图：
1：calc.glade
2，callbacks.c
#include
#include
#include
#include
#include "callbacks.h"
#define GLADE_FILE "calc.glade"
#define MAX_ENTRY_NUMBER 4 //最大允许数目
//全局变量
MainWindow* mwin;
gint entry_number = 0; //当前输入的数字个数
gint operator = 5; //当前运算，0表示无运算，1表示“加号”，2表示“减号”，3表示“乘号”，4表示“除号”，5表示“等号”，
gint result = 0; //上一次运算的结果
gint sign = 0; //前一个按键是否为操作键
GtkWindow*
create_main_window(void)
{
mwin = g_new0(MainWindow, 1);//动态分配内存，并清0
mwin->gxml = glade_xml_new (GLADE_FILE, NULL, NULL); //关联界面
/* This is important */
glade_xml_signal_autoconnect (mwin->gxml);
mwin->window =
(GtkWindow*)glade_xml_get_widget(mwin->gxml, "window1"); //关联控件
//关联显示框
mwin->result_entry =
(GtkEntry*)glade_xml_get_widget(mwin->gxml, "Result_entry");
//关联符号按钮
mwin->sign_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Sign_button");
g_signal_connect(G_OBJECT(mwin->sign_button),"clicked",
G_CALLBACK(on_Sign_button_clicked),NULL);
//关联数字按钮
mwin->zero_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Zero_button");
g_signal_connect(G_OBJECT(mwin->zero_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)0);
mwin->one_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "One_button");
g_signal_connect(G_OBJECT(mwin->one_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)1);
mwin->two_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Two_button");
g_signal_connect(G_OBJECT(mwin->two_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)2);
mwin->three_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Three_button");
g_signal_connect(G_OBJECT(mwin->three_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)3);
mwin->four_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Four_button");
g_signal_connect(G_OBJECT(mwin->four_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)4);
mwin->five_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Five_button");
g_signal_connect(G_OBJECT(mwin->five_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)5);
mwin->six_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Six_button");
g_signal_connect(G_OBJECT(mwin->six_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)6);
mwin->seven_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Seven_button");
g_signal_connect(G_OBJECT(mwin->seven_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)7);
mwin->eight_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Eight_button");
g_signal_connect(G_OBJECT(mwin->eight_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)8);
mwin->nine_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Nine_button");
g_signal_connect(G_OBJECT(mwin->nine_button),"clicked",
G_CALLBACK(on_Num_button_clicked),(gpointer)9);
//关联操作按钮
mwin->add_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Add_button");
g_signal_connect(G_OBJECT(mwin->add_button),"clicked",
G_CALLBACK(on_operator_button_clicked),(gpointer)1);
mwin->minus_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Minus_button");
g_signal_connect(G_OBJECT(mwin->minus_button),"clicked",
G_CALLBACK(on_operator_button_clicked),(gpointer)2);
mwin->multiply_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Multiply_button");
g_signal_connect(G_OBJECT(mwin->multiply_button),"clicked",
G_CALLBACK(on_operator_button_clicked),(gpointer)3);
mwin->divide_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Divide_button");
g_signal_connect(G_OBJECT(mwin->divide_button),"clicked",
G_CALLBACK(on_operator_button_clicked),(gpointer)4);
mwin->equal_button =
(GtkButton*)glade_xml_get_widget(mwin->gxml, "Equal_button");
g_signal_connect(G_OBJECT(mwin->equal_button),"clicked",
G_CALLBACK(on_operator_button_clicked),(gpointer)5);
return mwin->window;
}
//回退键响应函数
void
on_Backspace_button_clicked(GtkWidget* w, gpointer data)
{
printf("clicked Backspace button button/n");
gint i;
const gchar *str_in;
gchar str_out[10];
if(1 == sign)
{
entry_number = 0;
sign = 0;
str_out[0] = '0';
str_out[1] = '/0';
gtk_entry_set_text(mwin->result_entry, str_out);//写入新数据
return;
}
if(0 == entry_number)
return;
entry_number--;
str_in = gtk_entry_get_text(mwin->result_entry);//获得以前输入的数据
//处理数据
for(i=0; '/0' != str_in[i]; i++)
str_out[i] = str_in[i];
str_out[i-1] = '/0';
gtk_entry_set_text(mwin->result_entry, str_out);//写入新数据
}
//清除键响应函数
void
on_Clear_button_clicked(GtkWidget* w, gpointer data)
{
printf("clicked Clear button button/n");
//清除状态
operator = 5;
result = 0;
gchar str_out[10];
entry_number = 0;
sign = 0;
str_out[0] = '0';
str_out[1] = '/0';
gtk_entry_set_text(mwin->result_entry, str_out);//写入新数据
}
//符号键响应函数
void
on_Sign_button_clicked(GtkWidget* w, gpointer data)
{
printf("clicked Sign button button/n");
gint i = 0;
const gchar *str_in;
gchar str_out[10];
if(1 == sign)
{
entry_number = 0;
sign = 0;
str_out[0] = '0';
str_out[1] = '/0';
gtk_entry_set_text(mwin->result_entry, str_out);//写入新数据
return ;
}
str_in = gtk_entry_get_text(mwin->result_entry);//获得以前输入的数据
if('-' == str_in[0])
{
for(i=0;'/0' != str_in[i]; i++ )
str_out[i] = str_in[i+1];
}
else
{
str_out[0] = '-';
if('0' != str_in[0])
{
for(;'/0' != str_in[i]; i++ )
str_out[i+1] = str_in[i];
}
str_out[i+1] = '/0';
}
gtk_entry_set_text(mwin->result_entry, str_out);//写入新数据
}
//数字键响应函数
void
on_Num_button_clicked(GtkWidget* w, gint data)
{
printf("你按下的是数字键：%d/n",data);
GtkWidget* dialog; //消息提示对话框
gchar message[100];//显示的消息内容
gint i = 0;
const gchar *str_in;
gchar str_out[10];
if(1 == sign)
{
entry_number = 0;
sign = 0;
str_out[0] = data + '0';
str_out[1] = '/0';
gtk_entry_set_text(mwin->result_entry, str_out);//写入新数据
return;
}
str_in = gtk_entry_get_text(mwin->result_entry);//获得以前输入的数据
if(0 == data)//处理0
{
if(('-' == str_in[0]) || ('0' == str_in[0]))
return;
else if('/0' == str_in[0])
{
str_out[0] = '0';
str_out[1] = '/0';
gtk_entry_set_text(mwin->result_entry, str_out);//写入新数据
return;
}
}
if(MAX_ENTRY_NUMBER == entry_number)//处理超出限制问题
{
sprintf(message,"最多允许输入的数字为：%d",MAX_ENTRY_NUMBER);
dialog = gtk_message_dialog_new(NULL, //构建对话框
GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_WARNING,
GTK_BUTTONS_OK,
message);
gtk_dialog_run(GTK_DIALOG(dialog)); //运行对话框
gtk_widget_destroy(dialog); //销毁对话框
return;
}
//处理数据
if('0' != str_in[0])
{
for(; '/0' != str_in[i]; i++)
str_out[i] = str_in[i];
}
str_out[i] = (gchar)data + '0';
str_out[i+1] = '/0';
gtk_entry_set_text(mwin->result_entry, str_out);//写入新数据
entry_number++;
}
//0表示无运算，1表示“加号”，2表示“减号”，3表示“乘号”，4表示“除号”，5表示“等号”，
//操作键响应函数
void
on_operator_button_clicked(GtkWidget* w, gint data)
{
printf("你按下的是操作键：%d/n",data);
printf("其中：1表示“加号”，2表示“减号”，3表示“乘号”，4表示“除号”，5表示“等号”/n");
gint j,i = 0;
const gchar *str_in;
gchar str_out[10];
gchar str_out1[10];
gint input = 0; //本次输入的数值
GtkWidget* dialog; //消息提示对话框
str_in = gtk_entry_get_text(mwin->result_entry);//获得以前输入的数据
if(1 == sign)
{
operator = data;
return;
}
if('-' == str_in[0])
{
for(i=1;'/0' != str_in[i]; i++ )
input = (input * 10) + (str_in[i] - '0');
input = 0 - input;
}
else
{
for(i=0;'/0' != str_in[i]; i++ )
input = (input * 10) + (str_in[i] - '0');
}
switch(operator)
{
case 1:
result = result + input;
break;
case 2:
result = result - input;
break;
case 3:
result = result * input;
break;
case 4:
if(0 == input)
{
dialog = gtk_message_dialog_new(NULL, //构建对话框
GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_ERROR,
GTK_BUTTONS_CLOSE,
"除0非法");
gtk_dialog_run(GTK_DIALOG(dialog)); //运行对话框
gtk_widget_destroy(dialog); //销毁对话框
//清除状态
operator = 5;
result = 0;
return;
}
result = result / input;
break;
case 5:
result = input;
break;
}
input=result;
if(0 == input)
{
str_out[0] = '0';
str_out[1] = '/0';
}
else
{
j=i=0;
if(0 > input)
{
str_out[j++] = '-';
input = 0 - input;
}
while(0 != input)
{
str_out1[i++] = (input % 10) + '0';
input = input / 10;
}
while(i>0)
{
str_out[j++] = str_out1[--i];
}
str_out[j] = '/0';
}
gtk_entry_set_text(mwin->result_entry, str_out);//写入新数据
operator = data;
sign = 1;
}
3，callbacks.h
#include
#include
typedef struct _MainWindow MainWindow;
struct _MainWindow {
GladeXML *gxml;
GtkWindow *window;
//显示框
GtkEntry *result_entry;
//符号按钮
GtkButton *sign_button;
//数字按钮
GtkButton *zero_button;
GtkButton *one_button;
GtkButton *two_button;
GtkButton *three_button;
GtkButton *four_button;
GtkButton *five_button;
GtkButton *six_button;
GtkButton *seven_button;
GtkButton *eight_button;
GtkButton *nine_button;
//操作按钮
GtkButton *add_button;
GtkButton *minus_button;
GtkButton *multiply_button;
GtkButton *divide_button;
GtkButton *equal_button;
};
extern MainWindow* mwin;
GtkWindow* create_main_window(void);
void on_Backspace_button_clicked(GtkWidget* w, gpointer user_data);//回退键响应函数
void on_Clear_button_clicked(GtkWidget* w, gpointer user_data);//清除键响应函数
void on_Sign_button_clicked(GtkWidget* w, gpointer user_data);//符号键响应函数
void on_Num_button_clicked(GtkWidget* w, gint data);//数字键响应函数
void on_operator_button_clicked(GtkWidget* w, gint data);//操作键响应函数
4，main.c
#include
#include
#include "callbacks.h"
//gcc -o hello hello.c `pkg-config --cflags --libs libglade-2.0` -export-dynamic
int main(int argc, char *argv[]) {
GtkWidget* window;
gtk_init(&argc, &argv);
window = (GtkWidget*)create_main_window();
gtk_widget_show (window);
/* start the event loop */
gtk_main();
return 0;
}
5，Makefile
#以＃开头表示是注释行，以Tab键开头表示命令行，'/'表示之后一行合并到前一行，其后不能有任何字符
CC=gcc
PROG_NAME=calc
INCS=
SRCS= /
main.c /
callbacks.c
#从 xx.c 文件得到 xx.o 文件
OBJS=${SRCS:.c=.o}
#编译 GTK 程序时要用到的库
LIBS=libglade-2.0
#---- 用户修改区域 结束
# -O2
CFLAGS=`pkg-config --cflags ${LIBS}` -g -Wall
LDFLAGS=`pkg-config --libs ${LIBS}` -g -Wall
all: ${PROG_NAME}
${PROG_NAME}:${OBJS}
${CC} -o ${PROG_NAME} ${OBJS} ${LDFLAGS} -export-dynamic
#注意:上边”${CC}" 的前边有一个 TAB 键,而不是空格
#如果有头文件进行修改,则自动编译源文件
${OBJS}:${INCS}
.c.o:
${CC} -c $< ${CFLAGS}
clean:
rm -f *.o ${PROG_NAME}
rebuild: clean all
6，Readme.txt
计算器程序：
使用GTK2.0开发，Glade3设计界面。
包含全部源码，glade文件，Makefile文件，可执行文件
可完整实现带符号的四位是的加减乘除运算，添加大数运算模块可实现任意位数的加减乘除运算，是你学习C语言及GTK界面编程不可不看的案例。