Call the dynamic library file routine in QT Creator

 

In linux, qt has integrated the latest development platform QT Creator. Below is a routine for me to practice calling a dynamic library (. so file:

1. Open QT Creator and click File-New... select the C ++ Libarary project, click Next, and enter the project name (zsz in this example.

Project file (. pro) program list

 

#-------------------------------------------------

# Project created by QtCreator 2009-03-02T10: 09: 35

#-------------------------------------------------

TARGET = zsz

TEMPLATE = lib

CONFIG + = plugin

DEPENDPATH + =.

INCLUDEPATH + =.

 

SOURCES + = mylib. cpp

HEADERS + = mylib. h

 

 

Mylib. h file program list:

 

 

 

# Ifndef MYLIB_H

# Define MYLIB_H

 

# Ifdef Q_WS_WIN // indicates the windows Environment

# Define MY_EXPORT _ declspec (dllexport)

# Else

# Define MY_EXPORT

# Endif

 

Class mylib {

Public:

Int mymax (int I, int j );

Int add (int I, int j );

};

 

Extern "C" MY_EXPORT int diff (int I, int j );

 

# Endif // MYLIB_H

 

 

List of mylib. cpp file programs:

 

 

 

# Include "mylib. h"

 

 

Extern "C" MY_EXPORT int mylib: mymax (int I, int j)

{

If (I> = j)

Return I;

Else

Return j;

}

 

Extern "C" MY_EXPORT int mylib: add (int I, int j)

{

Return I + j;

}

 

Extern "C" MY_EXPORT int diff (int I, int j)

{

If (I> = j)

Return I-j;

Else

Return j-I;

}

Compile the project to generate the libzsz. so file.

 

 

 

2. Create a GUI project and copy the mylib. h and libzsz. so files under the zsz project to the current directory.

Project File program list:

 

 

 

#-------------------------------------------------

# Project created by QtCreator 2009-03-02T10: 15: 03

#-------------------------------------------------

TARGET =

TEMPLATE = app

 

QT + = svg

DEPENDPATH + =.

INCLUDEPATH + =.

LIBS + =./libzsz. so

 

SOURCES + = main. cpp

HEADERS + = mylib. h

 

 

The program in main. cpp is:

 

 

 

# Include <qapplication. h>

# Include <QPushButton>

# Include <QLibrary>

# Include <QtDebug>

# Include "mylib. h"

 

Int main (int argc, char * argv [])

{

QApplication app (argc, argv );

QPushButton hello ("Hello world! Zwd ");

Hello. resize (400,200 );

Mylib;

 

QDebug () <"In the two numbers 9 and 15, maxxer is" <a. mymax (15,9 );

QDebug () <"Add the two numbers 9 and 15, result is" <a. add (15,9 );

QDebug () <"Diff the two numbers 9 and 15, result is" <diff (15, 9 );

 

Hello. show ();

Return app.exe c ();

}