QDBus使用
一、服务端注册
// main.cpp
#include <QCoreApplication>
#include <QtDBus/QDBusConnection>
#include <QDebug>
#include <QtDBus/QDBusError>
#include <iostream>
#include "test.h"
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
//建立到session bus的连接
QDBusConnection connection = QDBusConnection::systemBus();
//在session bus上注册名为com.nde.chattr的服务
if(!connection.registerService("com.my.test"))
{
qDebug() << "error:" << connection.lastError().message();
exit(-1);
}
Test object;
// 注册名为/ndeChattr的对象，把类Object所有槽函数导出为object的method
connection.registerObject("/object", "com.my.test", &object, QDBusConnection::ExportAllSlots);
return a.exec();
}
//test.h
#ifndef TEST_H
#define TEST_H
#include <QObject>
#include <QStringList>
#include <QSettings>
class Test : public QObject
{
Q_OBJECT
//定义Interface名称为com.my.test
Q_CLASSINFO("D-Bus Interface", "com.my.test")
public:
explicit Test(QObject *parent = nullptr);
public slots:
void value();
private:
int process_count;
};
#endif // TEST_H
//test.cpp
#include "ndechattr.h"
#include <iostream>
Test::Test(QObject *parent) :
QObject(parent),
process_count(0)
{
}
void Test::value()
{
std::cout << process_count << std::endl;
}
二、配置服务端自动启动
方法一：当客户端调用到接口时自动启动服务
编写配置文件/usr/share/dbus-1/services/com.my.test.service
[D-BUS Service]
Name=com.my.test
Exec=/usr/bin/test
方法二：开机自启动服务
/usr/lib/systemd/system/test.service
[Unit]
Description=My Test Service
[Service]
ExecStart=/usr/bin/test
Restart=always
[Install]
WantedBy=multi-user.target
/etc/dbus-1/system.d/com.nde.chattr.conf
<!DOCTYPE busconfig PUBLIC
"-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<!-- Only root can own the service -->
<policy user="root">
<allow own="com.my.test"/>
</policy>
<policy context="default">
<allow send_destination="com.my.test" send_interface="org.freedesktop.DBus.Properties"/>
<allow send_destination="com.my.test" send_interface="org.freedesktop.DBus.Introspectable"/>
<allow send_destination="com.my.test" send_interface="com.my.test"/>
</policy>
</busconfig>
设定启动服务
systemctl enable test.service
systemctl start test.service
三、客户端调用：dbus-send
dbus-send --system --print-reply --dest=com.my.test /object com.my.test.value