1-2.c

使用GTK+的三个并发进程的演示

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

GtkWidget *bar,*label,*table,*window;
char buf[20];
int percent;

gint quit()
{
	gtk_main_quit();
	exit(0);
}

gint refresh()
{
	if(percent==100)  quit();  //进度条走完则关闭对话框
	sprintf(buf,"%d",++percent);
	strcat(buf,"% finished!");
	gtk_label_set_text(GTK_LABEL(label),buf);  //更新标签
	gtk_progress_set_percentage(GTK_PROGRESS(bar),(float)percent/100);  //更新进度条
}

int gtk(int argc,char *argv[],char *title)
{
	gtk_init(&argc,&argv);  //启动GTK
	window=gtk_window_new(GTK_WINDOW_TOPLEVEL);  //视窗
	gtk_window_set_title(GTK_WINDOW(window),title);  //设置标题
	gtk_window_set_policy(GTK_WINDOW(window),FALSE,FALSE,TRUE);  //固定大小
	gtk_container_border_width(GTK_CONTAINER(window),10);  //设定边框宽度
	gtk_signal_connect(GTK_OBJECT(window),"destroy",GTK_SIGNAL_FUNC(quit),NULL); //收到destroy信号
	table=gtk_table_new(2,1,TRUE);  //容器
	gtk_container_add(GTK_CONTAINER(window),table);  //将容器加入窗口中
	label=gtk_label_new("%0 finished!");  //标签
	gtk_table_attach(GTK_TABLE(table),label,0,2,0,1,GTK_FILL,GTK_FILL,0,0);  //将标签加容器中
	bar=gtk_progress_bar_new();  //进度条
	gtk_table_attach(GTK_TABLE(table),bar,0,2,1,2,GTK_FILL,GTK_FILL,0,0);  //将进度条加容器中
	percent=0;  //初始化
	gtk_widget_show_all(window);
	gtk_timeout_add(200,refresh,NULL);  //定时器
	gtk_main();  //所有控制结束于此并等待事件发生
	return 0;
}

int main(int argc,char *argv[])
{
	pid_t pid;
	pid=fork();  //创建进程2
	if(!pid){  //为进程2
		pid=fork();  //创建进程3
		if(pid>0){  //为进程2
			sleep(2);
			gtk(argc,argv,"Process2");
		}
		sleep(3);
		gtk(argc,argv,"Process3");
	}
	if(pid>0){ //为进程1
		sleep(1);
		gtk(argc,argv,"Process1");
	}
	if(pid<0)  exit(0);  //创建失败
	return 0;
}