Wake On Lan也就是远程唤醒(远程开机),即通过一台PC向另一台已经关机但仍连接电源PC发送网络数据包,使其开机的功能,前提是两台PC同处一个局域网内,且被唤醒方的网卡支持网络唤醒功能(现在网卡基本上都支持啦)。
原理:PC关闭后,网卡仍能获取电源,一直监听“magic” packet到来,这种数据包可以是IP、IPX或者其它什么,其中封装了特制的字节序列,一旦收到这种数据包,通过网卡与主板的协作,实现远程启动。
Magic包的格式:如果目标主机的MAC地址为 01:02:03:04:05:06的话,包的组成应该如下:
FFFFFFFFFFFF010203040506010203040506010203040506010203040506
010203040506010203040506010203040506010203040506010203040506
010203040506010203040506010203040506010203040506010203040506
010203040506010203040506
由6个16进制字节的FF和至少重复16次MAC地址组成。
下面是在QT3中实现的源代码:
//文件名:main.cpp
#include <qapplication.h>
#include "frmMain.h"
int main( int argc, char ** argv )
...{
QApplication a( argc, argv );
Form1 w;
w.show();
a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );
return a.exec();
}
/**//****************************************************************************
** Form implementation generated from reading ui file 'frmMain.ui'
**文件名:frmMain.cpp
** Created: 星期四 十月 19 16:30:55 2006
** by: The User Interface Compiler ($Id: qt/main.cpp 3.3.4 edited Nov 24 2003 $)
**
** WARNING! All changes made in this file will be lost!
****************************************************************************/
#include "frmMain.h"
#include <qvariant.h>
#include <qlineedit.h>
#include <qpushbutton.h>
#include <qlayout.h>
#include <qtooltip.h>
#include <qwhatsthis.h>
#include <qaction.h>
#include <qmenubar.h>
#include <qpopupmenu.h>
#include <qtoolbar.h>
#include <qimage.h>
#include <qpixmap.h>
#include "frmMain.ui.h"
/**//*
* Constructs a Form1 as a child of 'parent', with the
* name 'name' and widget flags set to 'f'.
*
*/
Form1::Form1( QWidget* parent, const char* name, WFlags fl )
: QMainWindow( parent, name, fl )
...{
(void)statusBar();
if ( !name )
setName( "Form1" );
setCentralWidget( new QWidget( this, "qt_central_widget" ) );
lineEdit1 = new QLineEdit( centralWidget(), "lineEdit1" );
lineEdit1->setGeometry( QRect( 40, 50, 271, 30 ) );
pushButton2 = new QPushButton( centralWidget(), "pushButton2" );
pushButton2->setGeometry( QRect( 120, 110, 80, 23 ) );
// toolbars
languageChange();
resize( QSize(391, 250).expandedTo(minimumSizeHint()) );
clearWState( WState_Polished );
// signals and slots connections
connect( pushButton2, SIGNAL( clicked() ), this, SLOT( pushButton2_clicked() ) );
}
/**//*
* Destroys the object and frees any allocated resources
*/
Form1::~Form1()
...{
// no need to delete child widgets, Qt does it all for us
}
/**//*
* Sets the strings of the subwidgets using the current
* language.
*/
void Form1::languageChange()
...{
setCaption( tr( "Wake On Lan For QT" ) );
lineEdit1->setText("00-11-09-9C-CF-A2");
pushButton2->setText( trUtf8( "\xe8\xbf\x9c\xe7\xa8\x8b\xe5\xbc\x80\xe6\x9c\xba" ) );
}
/**//****************************************************************************
** Form interface generated from reading ui file 'frmMain.ui'
**文件名:frmMain.h
** Created: 星期四 十月 19 15:44:26 2006
** by: The User Interface Compiler ($Id: qt/main.cpp 3.3.4 edited Nov 24 2003 $)
**
** WARNING! All changes made in this file will be lost!
****************************************************************************/
#ifndef FORM1_H
#define FORM1_H
#include <qvariant.h>
#include <qmainwindow.h>
class QVBoxLayout;
class QHBoxLayout;
class QGridLayout;
class QSpacerItem;
class QAction;
class QActionGroup;
class QToolBar;
class QPopupMenu;
class QLineEdit;
class QPushButton;
class Form1 : public QMainWindow
...{
Q_OBJECT
public:
Form1( QWidget* parent = 0, const char* name = 0, WFlags fl = WType_TopLevel );
~Form1();
QLineEdit* lineEdit1;
QPushButton* pushButton2;
public slots:
virtual void pushButton2_clicked();
protected:
protected slots:
virtual void languageChange();
};
#endif // FORM1_H
/**//****************************************************************************
** ui.h extension file, included from the uic-generated form implementation.
**文件名:frmMain.ui.h
** If you want to add, delete, or rename functions or slots, use
** Qt Designer to update this file, preserving your code.
**
** You should not define a constructor or destructor in this file.
** Instead, write your code in functions called init() and destroy().
** These will automatically be called by the form's constructor and
** destructor.
*****************************************************************************/
#include "qsocketdevice.h"
#include <qcstring.h>
#include <qmessagebox.h>
void Form1::pushButton2_clicked()
...{
//建立套接字相关对象
QSocketDevice *MUReceiveSocket; //套接字对象
//QSocketNotifier *MSocketNotifier; //套接字监听对象
//初始化套接字相关对象
MUReceiveSocket=new QSocketDevice(QSocketDevice::Datagram);
//UDP初始化
QHostAddress MyAddress;
QString FakeAddress;
QString SMacAddr=lineEdit1->text();//网卡的mac地址
const Port=0;//目标机器的端口号
//检查MAC地址是否等于17
if (SMacAddr.length()!=17) ...{
QMessageBox::warning(this,"MAC Address ERR","MAC Address must be =17");
return;
}
//检查MAC地址是否正确
for (int i=2;i<17;i=i+3) ...{
if (SMacAddr[i]!='-') ...{
QMessageBox::warning(this,"MAC Address ERR","MAC Adresse must be like this: 00-D0-4C-BF-52-BA");
return;
}
}
char MACAddr[6];
char MagicPacket[102];//实现远程开机的Magic包
int j=sscanf(SMacAddr, "%2x-%2x-%2x-%2x-%2x-%2x",
&MACAddr[0], &MACAddr[1], &MACAddr[2], &MACAddr[3], &MACAddr[4], &MACAddr[5]);
if (j!=6)
...{
QMessageBox::warning(this,"MAC Address ERR","Invalid MAC Adresse!");
return;
}
//把magicpacket数组前6个字符设置成16进制的ff
memset(MagicPacket, 0xff, 6);
int packetsize=6;//初始值是6,不要搞错了啊。我就是因为大意,把初始会值写成0,实在是太顺手了。
//构建MagicPacket
for (i=0;i<16;i++)
...{
memcpy(MagicPacket+packetsize,MACAddr,6);
packetsize+=6;
}
FakeAddress = "192.168.1.255"; //取得接口IP
MyAddress.setAddress(FakeAddress);
MUReceiveSocket->writeBlock(MagicPacket,102,MyAddress,Port);
}
Main.cpp、frmMain.cpp和frmMain.h是做完界面后QT自动生成的啦,主要的代码编写工作都在frmMain.ui.h。在frmMain.ui.h中实现Magic包的构建,并通过UDP方式将其广播出去。
在QT3中实现UDP网络功能的类是qsocketdevice,见源码。而在QT4中没有这个类,代之的是QUdpSocket,所以这个源码在QT4中无法通过编译。有兴趣的,可以自行修改。源码很简短,并有较详细的注释,我相信大家都能明白。该源码在XP+QT3+VC6中编译通过。
提醒一点的就是在写程序时尽量不要把C++的变量与QT的变量混用,虽然大多时候都能通过编译,但得到的数值并不一定是正确的,而且有时会出错的莫名其妙。我只是个QT的初学都,C++也没学多久,以前一直都是用delphi,有什么错误请大家多指教。
阅读(1530) | 评论(1) | 转发(0) |