原创 QT编程(2):

QT编程(2):应用qt-<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />2.3.2编译QT程序,可以下载到开发板中,qt-3.1不可以,如有自己定义的信号槽,需要用moc转换后,再用g++ 进行编译.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

1.     设置编译路径:

(1)export QTDIR="/home/qt-"2.3.2/

(2)export PATH=$QTDIR/bin:$PATH (3)exportLD_LIBRARY_PATH=$QTDIR/lib:$LD_LIBRARY_PATH

2.编辑ui界面:终端中进入qt-2.3.2->bin中, ./desigher .file->new->dialog->确定,加一个数码显示,一个增加按钮,一个关闭按钮,文件名为custom,保存在home下的文件夹中,如xw. 打开xw可以看到多了一个.ui后缀文件.

<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" />

3.转化为.h文件: uic -o custom.h custom.ui,可以看到又多了一个.h后缀文件.

4.右键单击h文件->打开方式->gedit,注释掉 //Q_OBJECT

5.转化为.cpp文件: uic -o custom.cpp -impl custom.h custom.ui  可以看到xw中多了一个custom.cpp.

6.h文件中增加槽定义: public slots: void add();  如下示:

/****************************************************************************

** Form interface generated from reading ui file 'custom.ui'

**

** Created: Thu Jul 2 08:38:19 2009

**      by:  The User Interface Compiler (uic)

**

** WARNING! All changes made in this file will be lost!

****************************************************************************/

#ifndef CUSTOM_H

#define CUSTOM_H

#include <qvariant.h>

#include <qdialog.h>

class QVBoxLayout;

class QHBoxLayout;

class QGridLayout;

class QLCDNumber;

class QPushButton;

class custom : public QDialog

{

 //  Q_OBJECT

public:

    custom( QWidget* parent = 0, const char* name = 0, bool modal = FALSE, WFlags fl = 0 );

    ~custom();

    QLCDNumber* LCDNumber1;

    QPushButton* PushButton1;

    QPushButton* PushButton2;

public slots: void add();                   //为新添加部分

};

#endif // CUSTOM_H

7.在custom.cpp文件中实现函数:

void custom::add()                                     

{

   LCDNumber1->display((LCDNumber1->value())+1);

}

信号槽连接部分添加的语句:

 connect(PushButton1,SIGNAL(clicked()),SLOT(add()));    

 connect(PushButton2,SIGNAL(clicked()),SLOT(close()));

函数如下:

/****************************************************************************

** Form implementation generated from reading ui file 'custom.ui'

**

** Created: Thu Jul 2 08:40:32 2009

**      by:  The User Interface Compiler (uic)

**

** WARNING! All changes made in this file will be lost!

****************************************************************************/

#include "custom.h"

#include <qlcdnumber.h>

#include <qpushbutton.h>

#include <qlayout.h>

#include <qvariant.h>

#include <qtooltip.h>

#include <qwhatsthis.h>

/*

 *  Constructs a custom which is a child of 'parent', with the

 *  name 'name' and widget flags set to 'f'

 *

 *  The dialog will by default be modeless, unless you set 'modal' to

 *  TRUE to construct a modal dialog.

 */

custom::custom( QWidget* parent,  const char* name, bool modal, WFlags fl )

    : QDialog( parent, name, modal, fl )

{

    if ( !name )

       setName( "custom" );

    resize( 596, 480 );

    setCaption( tr( "custom" ) );

    LCDNumber1 = new QLCDNumber( this, "LCDNumber1" );

    LCDNumber1->setGeometry( QRect( 190, 90, 191, 61 ) );

    PushButton1 = new QPushButton( this, "PushButton1" );

    PushButton1->setGeometry( QRect( 110, 230, 131, 61 ) );

    PushButton1->setText( tr( "add" ) );

    PushButton2 = new QPushButton( this, "PushButton2" );

    PushButton2->setGeometry( QRect( 340, 230, 90, 50 ) );

    PushButton2->setText( tr( "close" ) );

   connect(PushButton1,SIGNAL(clicked()),SLOT(add()));       //信号槽的连接

   connect(PushButton2,SIGNAL(clicked()),SLOT(close()));

}

void custom::add()                                      //加1函数的实现

{

   LCDNumber1->display((LCDNumber1->value())+1);

}

/* 

 *  Destroys the object and frees any allocated resources

 */

custom::~custom()

{

    // no need to delete child widgets, Qt does it all for us

}

8.主函数的头文件包含及改动,头文件名要对应,下面w前的类变为custom,如下:

#include <qapplication.h>

#include "custom.h"

int main( int argc, char ** argv )

{

    QApplication a( argc, argv );

    custom w;

    w.show();

    a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );

    return a.exec();

}

9.此时功能实现部分已经完成,下面要进行编译,因为有定义的槽,所以要转换为标准的C文件,具体实现如下:

(1)右键单击h文件->打开方式->gedit,把注释掉 //Q_OBJECT的语句还原, Q_OBJECT .

(2)转化成标准C文件:终端中输入,moc custom.h –o custom.moc.cpp

10.最后整体编译:g++ -o custom custom.moc.cpp custom.cpp main.cpp –L /home/qt-2.3.2/lib –lqt –I /home/qt-2.3.2/include/

编译完成后可以看到多了个可执行文件custom.