[Embedded] Use Qt to add a software keyboard to ARM9 (mini2440) and add a dynamic link library

The following four files can be downloaded from the embedded folder KeyPad in the Quickdisk

The methods for adding other dynamic link libraries are the same

Account: sharefromfox@163.com Password: 3.1415926

The following four files can be downloaded from the embedded folder KeyPad in the Quickdisk

The methods for adding other dynamic link libraries are the same

Account: sharefromfox@163.com Password: 3.1415926

first step:

First modify the usage permissions of the five files, preferably all 777

(sudo)Chomd 777 + (filename)

Copy the libQSoftKeypad.so.1.0.0 library file to the /usr/local/lib/ directory

sudo cp libQSoftKeypad.so.1.0.0 /usr/local/lib/

Enter the /usr/local/lib/ directory

Create three connections for the library file: *.so,*.so.1,*.so.1.0,

You can use the following command:

1 ln -s libQSoftKeypad.so.1.0.0 libQSoftKeypad.so.1.0

2

3 ln -s libQSoftKeypad.so.1.0.0 libQSoftKeypad.so.1

4

5 ln -s libQSoftKeypad.so.1.0.0 libQSoftKeypad.so

(sudo ldconfig –v can view all dynamic link libraries)

sudo ldconfig –v |grep libQ to view the library containing libQ

The next step is to copy the other four header files to the cross-environment compiler library

1 sudo cp keyboard.h qsoftkeypad.h keyunit.h QSoftKeypad_global.h /usr/local/Trolltech/Qt-4.6.3-arm/include/QtGui/

Of course, you also need to copy the library file card to the cross-compilation environment library and create 3 connections

1 sudo cp libQSoftKeypad.so.1.0.0 /usr/local/Trolltech/Qt-4.6.3-arm/lib/

2 sudo ln -s libQSoftKeypad.so.1.0.0 libQSoftKeypad.so.1.0

3 sudo ln -s libQSoftKeypad.so.1.0.0 libQSoftKeypad.so.1

4 sudo ln -s libQSoftKeypad.so.1.0.0 libQSoftKeypad.so

Next, add libQSoftKeypad.so.1.0.0 to the system compilation environment library of the development board

And perform dynamic linking, the steps are the same as above, pay attention to the path

Okay, that's it. Let's write a Qt program to test it.

Running the following program in qt fails

You can only use the command line to cross compile. This requires setting up the Qt environment for the development board first.

First add LIBS += -lQSoftKeypad to the project's .pro file

7 QT += core gui

8

9 TARGET = KeyPad

10 TEMPLATE = app

11

12

13 SOURCES += main.cpp

14 mainwindow.cpp

15

16 HEADERS += mainwindow.h

17

18 FORMS += mainwindow.ui

19

20 LIBS += -lQSoftKeypad

1 #ifndef MAINWINDOW_H

2 #define MAINWINDOW_H

3

4 #include

5 #include "qsoftkeypad.h"

6 #include

7

8 namespace Ui {

9 class MainWindow;

10 }

11

12 class MainWindow : public QMainWindow

13 {

14 Q_OBJECT

15

16 public:

17 explicit MainWindow(QWidget *parent = 0);

18~MainWindow();

private:

Ui::MainWindow *ui;

private slots:

void on_pushButton_clicked();

};

1 #include "mainwindow.h"

2 #include "ui_mainwindow.h"

3

4 MainWindow::MainWindow(QWidget *parent):

5 QMainWindow(parent),

6 ui(new Ui::MainWindow)

7 {

8 ui->setupUi(this);

9 setWindowFlags(Qt::FramelessWindowHint);

10 setFocusPolicy(Qt::StrongFocus);

11 }

12

13 MainWindow::~MainWindow()

14 {

15 delete ui;

16 }

17

18 void MainWindow::on_pushButton_clicked()

19 {

20 ui->label->setText(ui->lineEdit->text());

twenty one }

After cross-compiling, copy the KeyPad in the KeyPad file to the development board system environment. In my quick disk, I have sent all the files generated after cross-compiling. You can use it directly, but the effect may be a little bit wrong. Pay attention to adding #include "qsoftkeypad.h" header file in the program. The program is simple and the interface is easy to implement without detailed description.