C++ 如何检测用户何时按下了电源关闭按钮?
我有一个街机鸡尾酒柜(没有键盘,只有一个操纵杆和按钮)运行Ubuntu12.4.1,当按下电源按钮时会出现一个弹出窗口,系统会很好地关闭,但当我的全屏游戏启动程序菜单应用程序运行时,按下按钮没有效果。我想在按下按钮时捕获事件,以便我的应用程序可以触发系统关闭。我的菜单应用程序是用C++编写的,并且使用SDL。关于如何捕捉断电按钮按下事件,有什么想法吗 感谢响应者,下面是我用来让它工作的实际代码: 班级成员:C++ 如何检测用户何时按下了电源关闭按钮?,c++,c,linux,power-management,C++,C,Linux,Power Management,我有一个街机鸡尾酒柜(没有键盘,只有一个操纵杆和按钮)运行Ubuntu12.4.1,当按下电源按钮时会出现一个弹出窗口,系统会很好地关闭,但当我的全屏游戏启动程序菜单应用程序运行时,按下按钮没有效果。我想在按下按钮时捕获事件,以便我的应用程序可以触发系统关闭。我的菜单应用程序是用C++编写的,并且使用SDL。关于如何捕捉断电按钮按下事件,有什么想法吗 感谢响应者,下面是我用来让它工作的实际代码: 班级成员: int m_acpidsock; sockaddr_un m_acpidsockaddr
int m_acpidsock;
sockaddr_un m_acpidsockaddr;
/* Connect to acpid socket */
m_acpidsock = socket(AF_UNIX, SOCK_STREAM, 0);
if(m_acpidsock>=0)
{
m_acpidsockaddr.sun_family = AF_UNIX;
strcpy(m_acpidsockaddr.sun_path,"/var/run/acpid.socket");
if(connect(m_acpidsock, (struct sockaddr *)&m_acpidsockaddr, 108)<0)
{
/* can't connect */
close(m_acpidsock);
m_acpidsock=-1;
}
}
/* check for any power events */
if(m_acpidsock)
{
char buf[1024];
int s=recv(m_acpidsock, buf, sizeof(buf), MSG_DONTWAIT);
if(s>0)
{
buf[s]=0;
printf("ACPID:%s\n\n",buf);
if(!strncmp(buf,"button/power",12))
{
setShutdown();
system("shutdown -P now");
}
}
}
if(m_acpidsock>=0)
{
close(m_acpidsock);
m_acpidsock=-1;
}
设置代码:
int m_acpidsock;
sockaddr_un m_acpidsockaddr;
/* Connect to acpid socket */
m_acpidsock = socket(AF_UNIX, SOCK_STREAM, 0);
if(m_acpidsock>=0)
{
m_acpidsockaddr.sun_family = AF_UNIX;
strcpy(m_acpidsockaddr.sun_path,"/var/run/acpid.socket");
if(connect(m_acpidsock, (struct sockaddr *)&m_acpidsockaddr, 108)<0)
{
/* can't connect */
close(m_acpidsock);
m_acpidsock=-1;
}
}
/* check for any power events */
if(m_acpidsock)
{
char buf[1024];
int s=recv(m_acpidsock, buf, sizeof(buf), MSG_DONTWAIT);
if(s>0)
{
buf[s]=0;
printf("ACPID:%s\n\n",buf);
if(!strncmp(buf,"button/power",12))
{
setShutdown();
system("shutdown -P now");
}
}
}
if(m_acpidsock>=0)
{
close(m_acpidsock);
m_acpidsock=-1;
}
关闭套接字代码:
int m_acpidsock;
sockaddr_un m_acpidsockaddr;
/* Connect to acpid socket */
m_acpidsock = socket(AF_UNIX, SOCK_STREAM, 0);
if(m_acpidsock>=0)
{
m_acpidsockaddr.sun_family = AF_UNIX;
strcpy(m_acpidsockaddr.sun_path,"/var/run/acpid.socket");
if(connect(m_acpidsock, (struct sockaddr *)&m_acpidsockaddr, 108)<0)
{
/* can't connect */
close(m_acpidsock);
m_acpidsock=-1;
}
}
/* check for any power events */
if(m_acpidsock)
{
char buf[1024];
int s=recv(m_acpidsock, buf, sizeof(buf), MSG_DONTWAIT);
if(s>0)
{
buf[s]=0;
printf("ACPID:%s\n\n",buf);
if(!strncmp(buf,"button/power",12))
{
setShutdown();
system("shutdown -P now");
}
}
}
if(m_acpidsock>=0)
{
close(m_acpidsock);
m_acpidsock=-1;
}
最后,我需要允许非root用户关机,这一点在使用这一行时有效:
sudo chmod u+s /sbin/shutdown
您可以启动一个线程来读取
/proc/events/acpi
,然后解码那里的消息
但是使用acpid
来实现这一点怎么样?您将收听/var/run/acpid.socket
,当您关心的消息传入时,请执行您必须执行的操作
见:
我希望这是有用的 看一看,我认为您可以更改
/etc/acpi/
中的一个脚本,特别是/etc/acpi/powerbtn.sh
,以添加自定义命令。您也可以自己尝试阅读/proc/acpi/event
。按下电源按钮等操作会触发acpi事件,acpid会触发脚本以响应/etc/acpi/events中配置的事件。在本例中,您需要/etc/acpi/powerbtn,它看起来像这样:
event=button[ /]power
action=/etc/acpi/powerbtn.sh
您可以自定义/etc/acpi/powerbtn.sh,也可以将它指向您选择的另一个脚本。不,但这听起来很酷!connect()调用中的数字108是什么?它不应该是sizeof(m_acpidsockaddr)吗?