Problem - Windows Screensaver

[kingsta]

Hello guys

I want to make a Windows Screensaver application. I want to change screensaver from list on my app. Firstly, I got the DefScreenSaverProc function don't declare error. Than I added the pro file some codes (pro file => line 27-36) to declare scrnsave.h. Secondly I got the error below.

Issue
@Makefile.Debug:79: error: multiple target patterns. Stop.@

• How can i fix that error?
• Does this code work? There are a lot of way to do that program. I can use OpenGL, Win API etc. I know WinAPI more than OpenGL. So I should make with Win API.

Additionally, I use Qt Creator 3.0 and Qt 5.2
I use Qt Android 5.2 version but I use "Desktop Qt 5.2 MinGw 32Bit" Kit

pro file;
@#-------------------------------------------------

Project created by QtCreator 2014-06-27T12:36:36

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

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = WindowsScreenSaver_2
TEMPLATE = app

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

#win32: LIBS += -lscrnsave

win32: LIBS += -L$$PWD/C:/Qt/Qt5.2.0/Tools/mingw48_32/i686-w64-mingw32/lib/ -lscrnsave

INCLUDEPATH += $$PWD/C:/Qt/Qt5.2.0/Tools/mingw48_32/i686-w64-mingw32/include
DEPENDPATH += $$PWD/C:/Qt/Qt5.2.0/Tools/mingw48_32/i686-w64-mingw32/include

#Original
#win32:!win32-g++ PRE_TARGETDEPS += $$PWD/C:/Qt/Qt5.2.0/Tools/mingw48_32/i686-w64-mingw32/lib/scrnsave.lib

win32:!win32-g++: PRE_TARGETDEPS += $$PWD/C:/Qt/Qt5.2.0/Tools/mingw48_32/i686-w64-mingw32/lib/scrnsave.lib
else:win32-g++: PRE_TARGETDEPS += $$PWD/C:/Qt/Qt5.2.0/Tools/mingw48_32/i686-w64-mingw32/lib/libscrnsave.a
@

mainwindow.cpp
@#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <windows.h>
#include <scrnsave.h>

LONG WINAPI ScreenSaverProc(HWND hwnd,UINT message,WPARAM wparam,LPARAM lparam)
{
// Handles screen saver messages
switch(message)
{
case WM_CREATE:
// Creation of the screen saver window
return 0;
case WM_ERASEBKGND:
// Erases the screen saver background
return 0;
case WM_TIMER:
// Handles the timer
return 0;
case WM_DESTROY:
// Cleans up the screen saver window
PostQuitMessage(0);
return 0;
}
return DefScreenSaverProc(hwnd,message,wparam,lparam);
}

BOOL WINAPI ScreenSaverConfigureDialog(HWND hwnd,UINT message,WPARAM wparam,LPARAM lparam)
{
return true;
}
BOOL WINAPI RegisterDialogClasses(HANDLE hmodule)
{
return true;
}

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

MainWindow::~MainWindow()
{
delete ui;
}
@