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class MyInterface
{
public:
  virtual ~MyInterface();

  virtual QString doSomething( int value ) = 0;
};
Q_DECLARE_INTERFACE( MyInterface,
  "unique_keyword.MyInterface.version-1.0")

// myplugin.h
class MyPlugin : public QObject, MyInterface
{
  Q_OBJECT
  Q_INTERFACES( MyInterface )
public:
  QString doSomething( int value ) { return QString::number( value ); }
};

//myplugin.cpp
Q_EXPORT_PLUGIN2( my_plugin, MyPlugin )

QPluginLoader loader( "myplugin.dll" );
if ( !loader.load() )
{
  qWarning( "This is not Qt plugin or plugin not match out Qt Libraries" );
  return;
}
MyInterface * i = qobject_cast<MyInterface*>( loader.instance() );
if ( !i )
{
  qWarning( "This is not plugin for interface MyInterface" );
  return;
}
QString text = i->doSomething( 123 ); // text = "123"

TEMPLATE = lib
CONFIG += dll release
HEADERS += deconvolution.h
SOURCES += deconvolution.cpp

#define DECONV_DLL __declspec(dllexport)
#endif

#include "deconvolution.h"

extern "C" DECONV_DLL void funcDeconv(QVector<CurveData> &curveMatrix)
{
    int size = curveMatrix.size();
}

#ifndef __DECONVOLUTION1_H
#define __DECONVOLUTION1_H

#include <QVector>

typedef QVector<double> CurveData;

#endif

    QLibrary deconvLib("deconvolution");
    typedef double (*deconvFunction)(QVector<CurveData> &curveMatrix);
    deconvFunction funcDeconv = (deconvFunction)  deconvLib.resolve("funcDeconv");
    if (!funcDeconv)
       statusBar()->showMessage(tr("Can't load deconvolution library."), 15000);
    else
       funcDeconv(curveMatrixForDeconv);

debug/moc_dbengine.o: In function `qt_plugin_query_verification_data':
H:\QProject\src\DBEngine/../Core/interfaces.h:6: multiple definition of `qt_plugin_query_verification_data'
debug/dbengine.o:H:\QProject\src\DBEngine/dbengine.h:14: first defined here
debug/moc_dbengine.o: In function `qt_plugin_instance':
H:\QProject\src\DBEngine/debug//../dbengine.h:14: multiple definition of `qt_plugin_instance'
debug/dbengine.o:H:\QProject\src\DBEngine/dbengine.h:14: first defined here
collect2: ld returned 1 exit status
mingw32-make[2]: *** [..\..\bin\plugins\DBEngine.dll] Error 1
mingw32-make[1]: *** [debug] Error 2
mingw32-make: *** [sub-DBEngine-make_default] Error 2
Завершено с кодом 2.