QT绑定D-Bus程序实例
参考自：
http://laurii.info/articles/2007/03/22/dbus-and-qt-programmin
http://blog.chinaunix.net/u2/69889/showart_2316513.html
根据第二个BLOG，我改动了部分代码，使用dbus interface调用方式，一步一步建立C/S结构代码：
[socol@localhost testdbus]$ ll
client
hotelibs
service
1. 建立库函数hotelibs
[socol@localhost testdbus]$ cd hotelibs
[socol@localhost hotelibs]$ ll
hotel.pro
hotel.cpp
hotel.h
[socol@localhost hotelibs]$cat hotel.h
#ifndef HOTEL_H
#define HOTEL_H
#include <QObject>
#include <QReadWriteLock>
#define MAX_ROOMS 10
class Hotel : public QObject
{
Q_OBJECT
// 定义Interface名称为"com.test.hotel.registry"
Q_CLASSINFO("D-Bus Interface", "com.test.hotel.registry")
public:
Hotel() { m_rooms = MAX_ROOMS; }
public slots:
// Check in，参数为房间数，返回成功拿到的房间数
int checkIn(int num_room);
// Check out，参数为房间数，返回成功退回的房间数
int checkOut(int num_room);
// Query，用于查询目前还剩下的房间数
int query();
private:
int m_rooms;
QReadWriteLock m_lock;
};
#endif // HOTEL_H
[socol@localhost hotelibs]$cat hotel.cpp
#include <QtCore>
#include <QtDBus>
#include <QReadLocker>
#include <QWriteLocker>
#include "hotel.h"
int Hotel::checkIn(int num_room)
{
QWriteLocker locker(&m_lock);
if (m_rooms >= num_room) {
m_rooms -= num_room;
} else {
num_room = m_rooms;
m_rooms = 0;
}
return num_room;
}
int Hotel::checkOut(int num_room)
{
QWriteLocker locker(&m_lock);
m_rooms += num_room;
if (m_rooms > MAX_ROOMS) {
num_room -= (m_rooms - MAX_ROOMS);
m_rooms = MAX_ROOMS;
}
return num_room;
}
int Hotel::query()
{
QReadLocker locker(&m_lock);
return m_rooms;
}
[socol@localhost hotelibs]$ qdbuscpp2xml -A hotel.h -o com.test.hotel.xml
[socol@localhost hotelibs]$ qdbusxml2cpp com.test.hotel.xml -i hotel.h -p hotelInterface
[socol@localhost hotelibs]$ll
com.test.hotel.xml
hotel.cpp
hotel.h
hotelibs.pro
hotelInterface.cpp
hotelInterface.h
[socol@localhost hotelibs]$cat com.test.hotel.xml
<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
<interface name="com.test.hotel.registry">
<signal name="roomChanged">
<arg name="num_room" type="i" direction="out"/>
</signal>
<method name="checkIn">
<arg type="i" direction="out"/>
<arg name="num_room" type="i" direction="in"/>
</method>
<method name="checkOut">
<arg type="i" direction="out"/>
<arg name="num_room" type="i" direction="in"/>
</method>
<method name="query">
<arg type="i" direction="out"/>
</method>
</interface>
</node>
[socol@localhost hotelibs]$cat hotelibs.pro
QT += dbus QT -= gui TARGET = hotelibs CONFIG += console CONFIG -= app_bundle TEMPLATE = lib SOURCES += hotelInterface.cpp hotel.cpp HEADERS += hotelInterface.h hotel.h
[socol@localhost hotelibs]$qmake-qt4 & make
[socol@localhost hotelibs]$sudo cp libhotelibs.so* /usr/lib
2. 建立服务端service
[socol@localhost testdbus]$ cd service
[socol@localhost service]$ ll
hotelservice.pro
main.cpp
[socol@localhost service]$cat hotelservice.pro
QT += dbus QT -= gui TARGET = hotelservice CONFIG += console CONFIG -= app_bundle TEMPLATE = app SOURCES += main.cpp LIBS += -L../hotelibs -lhotelibs INCLUDEPATH += ../hotelibs
[socol@localhost service]$cat main.cpp
#include <QtCore>
#include <QtDBus>
#include <QReadLocker>
#include <QWriteLocker>
#include "hotel.h"
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
// 用于建立到session bus的连接
QDBusConnection bus = QDBusConnection::sessionBus();
// 在session bus上注册名为"com.test.hotel"的service
if (!bus.registerService("com.test.hotel")) {
qDebug() << bus.lastError().message();
exit(1);
}
Hotel my_hotel;
#if 0
// adaport 方式，需要在hotelibs目录中运行：
// qdbusxml2cpp com.test.hotel.xml -i hotel.h -a hotelAdaport
new RegistryAdaptor(my_hotel);
#else
// 注册名为"/hotel/registry"的object。
// "QDBusConnection::ExportAllSlots "表示把类Hotel的所有Slot都导出为这个Object的method
// 如果需要使用signal的话可以使用 QDBusConnection::ExportAllSignals
bus.registerObject("/hotel/registry", &my_hotel,
QDBusConnection::ExportAllSlots);
#endif
return a.exec();
}
[socol@localhost service]$qmake-qt4 & make
[socol@localhost service]$sudo cp hotelservice /usr/libexec/
[socol@localhost service]$sudo vim /usr/share/dbus-1/services/com.test.hotel.service
[socol@localhost service]$cat /usr/share/dbus-1/services/com.test.hotel.service
[D-BUS Service]
Name=com.test.hotel
Exec=/usr/libexec/hotelservice
3. 建立客户端client
[socol@localhost testdbus]$ cd client
[socol@localhost client]$ ll
main.cpp
hotelclient.pro
[socol@localhost client]$cat main.cpp
#include <QtCore>
#include <QtDBus>
#include <hotel.h>
#include <hotelInterface.h>
int main(int argc, char *argv[])
{
int num_room;
if (argc > 2) {
fprintf(stderr, "Usage: %s [num_room]\n", argv[0]);
exit(1);
}
if (argc == 2) {
num_room = QString(argv[1]).toInt();
} else {
num_room = 1;
}
// 初始化自动生成的Proxy类com::test::hotel::registry
com::test::hotel::registry myHotel("com.test.hotel",
"/hotel/registry",
QDBusConnection::sessionBus());
// 调用checkIn
QDBusPendingReply<int> reply = myHotel.checkIn(num_room);
// qdbusxml2cpp生成的Proxy类是采用异步的方式来传递Message，
// 所以在此需要调用waitForFinished来等到Message执行完成
reply.waitForFinished();
if (reply.isValid()) {
num_room = reply.value();
printf("Got %d %s\n", num_room, (num_room > 1) ? "rooms" : "room");
} else {
fprintf(stderr, "Check In fail!\n");
}
return 0;
}
[socol@localhost client]$cat hotelclient.pro
QT += dbus QT -= gui TARGET = hotelclient CONFIG += console CONFIG -= app_bundle TEMPLATE = app LIBS += -L../hotelibs -lhotelibs INCLUDEPATH += ../hotelibs SOURCES += main.cpp
4.测试
[socol@localhost client]$d-feet
// select query() execut, result 10
[socol@localhost client]$./hotelclient
Got 1 room
[socol@localhost client]$d-feet
// select query() execut, result 9