External errors

[A Former User]

Code below works with Qt 5.3.2 but when I try to compile it on the 5.4 I get external errors... Also I've noticed many of projects built with Qt 5.3.2 can not be open in 5.4... Always getting error - Could not find qmake configuration file default.
Error while parsing file C:/Users/Administrator/Documents/phLogin/phLogin.pro. Giving up.

@#include "Windows.h"
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QProcess>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
DWORD procId;
QString pIDClient;
QString prefix = "cmd /C taskkill /F /S localhost /PID ";
QString name = "Notepad";
HWND hwnd = FindWindow(NULL, (LPCTSTR)name.utf16());
if(hwnd != 0)
{
GetWindowThreadProcessId(hwnd, &procId);
pIDClient = QString::number(procId);
}

   QProcess *cKill = new QProcess(this);
   QString cIDKill = prefix + pIDClient;
   cKill->start(cIDKill);

}

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

@mainwindow.obj:-1: error: LNK2019: unresolved external symbol __imp__FindWindowW@8 referenced in function "public: __thiscall MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QAE@PAVQWidget@@@Z)

mainwindow.obj:-1: error: LNK2019: unresolved external symbol __imp__GetWindowThreadProcessId@8 referenced in function "public: __thiscall MainWindow::MainWindow(class QWidget *)" (??0MainWindow@@QAE@PAVQWidget@@@Z)@

[sierdzio]

Looks like you've got some linking and qmake problems.

For a start, I would recommend to do a full clean up of your build, remove .pro.user file, then open and configure the project again using Qt 5.4. I suspect you've got some leftovers from previous builds and they are interfering.