Undefined reference to projectControl::get_defprojloc()

[phxvyper]

I'm receiving a "undefined reference to 'projectControl:get_defprojloc()'" with the following code...

projectcontrol.h

#ifndef PROJECTCONTROL_H
#define PROJECTCONTROL_H
#include "string"

class projectControl
{
public:
    projectControl();
    std::string get_defprojloc();
    std::string get_defprojfolder();
};

#endif // PROJECTCONTROL_H 

projectcontrol.cpp

#include <QApplication>
#include <projectcontrol.h>
#include <string>

std::string mdk_defProjLoc = "";

std::string mdk_defProjFolder = "";

projectControl::projectControl()
{

}

std::string get_defprojloc() {
    return mdk_defProjLoc;
}
void set_defprojloc(std::string newloc) {
    mdk_defProjLoc = newloc;
}
std::string get_defprojfolder() {
    return mdk_defProjFolder;
}
void set_defprojfolder(std::string newloc) {
    mdk_defProjFolder = newloc;
}

splashscreen.cpp (I get the error in this source file on line 22)

#include "splashscreen.h"
#include "ui_splashscreen.h"
#include "projectcontrol.h"
#include "QKeyEvent"

splashScreen::splashScreen(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::splashScreen)
{
    ui->setupUi(this);

}

splashScreen::~splashScreen()
{
    delete ui;
}

void splashScreen::keyPressEvent(QKeyEvent *event) {
    if (event->key() == Qt::Key_Alt) {
        projectControl *projCntrl = new projectControl();
        std::string str_test = projCntrl->get_defprojloc();
    }
}

What do i do to get rid of the error? I've been to two other forum posts about a similar issue but they did not solve the error.

[AbstractionAnon]

Your implementation of get_defprojloc is in your global name space, and is not a member of projectControl. It should be:

std::string projectControl::get_defprojloc() 

set_defprojloc, get_defprojfolder, set_defprojfolder have the same issue.

[phxvyper]

Thanks AbstractionAnon, that fixed my problem.

I appreciate it!