用QT實現Wake On Lan功能（附全部程式原始碼）
阿新 • • 發佈：2019-02-10
Wake On Lan也就是遠端喚醒（遠端開機），即通過一臺PC向另一臺已經關機但仍連線電源PC傳送網路資料包，使其開機的功能，前提是兩臺PC同處一個區域網內，且被喚醒方的網絡卡支援網路喚醒功能（現在網絡卡基本上都支援啦）。
原理：PC關閉後，網絡卡仍能獲取電源，一直監聽“magic” packet到來，這種資料包可以是IP、IPX或者其它什麼，其中封裝了特製的位元組序列，一旦收到這種資料包，通過網絡卡與主機板的協作，實現遠端啟動。
Magic包的格式：如果目標主機的MAC地址為 01:02:03:04:05:06的話，包的組成應該如下：
FFFFFFFFFFFF010203040506010203040506010203040506010203040506
010203040506010203040506010203040506010203040506010203040506
010203040506010203040506010203040506010203040506010203040506
010203040506010203040506
由6個16進位制位元組的FF和至少重複16次MAC地址組成。
下面是在QT3中實現的原始碼：
//檔名：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();
}
/******************************************************************************檔名：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 $)**** WARNING! All changes made in this file will be lost!***************************************************************************#include "frmMain.h"#include <qvariant.h>#include <qlineedit.h>#include <qpushbutton.h>#include <qlayout.h>#include <qtooltip.h>#include <qwhatsthis.h>#include <qaction.h>#include <qmenubar.h>#include <qpopupmenu.h>#include <qtoolbar.h>#include <qimage.h>#include <qpixmap.h>#include "frmMain.ui.h"/* * Constructs a Form1 as a child of 'parent', with the * name 'name' and widget flags set to 'f'. * */Form1::Form1( QWidget* parent, constchar* name, WFlags fl ) : QMainWindow( parent, name, fl ){ (void)statusBar(); if ( !name ) setName( "Form1" ); setCentralWidget( new QWidget( this, "qt_central_widget" ) ); lineEdit1 =new QLineEdit( centralWidget(), "lineEdit1" ); lineEdit1->setGeometry( QRect( 40, 50, 271, 30 ) ); pushButton2 =new QPushButton( centralWidget(), "pushButton2" ); pushButton2->setGeometry( QRect( 120, 110, 80, 23 ) ); // toolbars languageChange(); resize( QSize(391, 250).expandedTo(minimumSizeHint()) ); clearWState( WState_Polished ); // signals and slots connections connect( pushButton2, SIGNAL( clicked() ), this, SLOT( pushButton2_clicked() ) );}/* * Destroys the object and frees any allocated resources */Form1::~Form1(){ // no need to delete child widgets, Qt does it all for us}/* * Sets the strings of the subwidgets using the current * language. */void Form1::languageChange(){ setCaption( tr( "Wake On Lan For QT" ) ); lineEdit1->setText("00-11-09-9C-CF-A2"); pushButton2->setText( trUtf8( "/xe8/xbf/x9c/xe7/xa8/x8b/xe5/xbc/x80/xe6/x9c/xba" ) );}
/****************************************************************************** Form interface generated from reading ui file 'frmMain.ui'**檔名：frmMain.h** Created: 星期四 十月 19 15:44:26 2006** by: The User Interface Compiler ($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_OBJECTpublic: Form1( QWidget* parent =0, constchar* name =0, WFlags fl = WType_TopLevel ); ~Form1(); QLineEdit* lineEdit1; QPushButton* pushButton2;public slots: virtualvoid pushButton2_clicked();protected:protected slots: virtualvoid languageChange();};#endif// FORM1_H
/****************************************************************************** ui.h extension file, included from the uic-generated form implementation.**檔名：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(){//建立套接字相關物件 QSocketDevice *MUReceiveSocket; //套接字物件 //QSocketNotifier *MSocketNotifier; //套接字監聽物件//初始化套接字相關物件MUReceiveSocket=new QSocketDevice(QSocketDevice::Datagram); //UDP初始化QHostAddress MyAddress;QString FakeAddress;QString SMacAddr=lineEdit1->text();//網絡卡的mac地址const Port=0;//目標機器的埠號//檢查MAC地址是否等於17
if (SMacAddr.length()!=17) {
QMessageBox::warning(this,"MAC Address ERR","MAC Address must be =17"); return; 
}//檢查MAC地址是否正確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];//實現遠端開機的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陣列前6個字元設定成16進位制的ff memset(MagicPacket, 0xff, 6); int packetsize=6;//初始值是6，不要搞錯了啊。我就是因為大意，把初始會值寫成0，實在是太順手了。//構建MagicPacketfor (i=0;i<16;i++) { memcpy(MagicPacket+packetsize,MACAddr,6); packetsize+=6;}FakeAddress ="