"Undefined reference to" issues

[lucbaz]

Hi,

I am in charge of fixing bugs and improving a C++ program that was written in Qt back in 2008.

After fixing some errors, I get a list of more 500 errors that starts with "undefined reference to ..."
An example is:

/*
		MODULE:			CALCWND.CPP

		VERSION:		2.2
*/

#include <QPainter>
#include <QPaintEvent>
#include <QPaintEngine>
#include <QScrollbar>
#include <QTime>
#include <windows.h>
#include <cmath>
#include <QtDebug>

#include "calcwnd.h"
#include "xrda_def.h"
#include "xrdawnd.h"
#include "xrdproject.h"

bool SortByE = true;

extern XrdaWnd *Wnd;
extern XRDProject *Proj;

Calc::Calc(int th, int tk, int tl)	// initialization of Calc class object
{
	h = th;
	k = tk;
	l = tl;
	Ecalc = 0.;
	Icalc = 0.;
	Eobs = 0;
	Iobs = 0;
}

void Calc::EnterE(float E)
{
	Ecalc = E;
}

void Calc::EnterI(float I)
{
	Icalc = I;
}

void Calc::CheckObserved()
{
	Peak *P;

	if (h != 0 || k != 0 || l != 0)
		for (PEAKS::const_iterator iter = Proj->Phases[Proj->SelPhaseNo]->Peaks.begin();
			iter != Proj->Phases[Proj->SelPhaseNo]->Peaks.end(); iter++)
		{
			P = (*iter).get();
			if ((P->h == h) && (P->k == k) && (P->l == l))
			{
				Eobs = P->Eobs;
				Iobs = P->Iobs;
			}
		}
}

// sort by increasing energy but dec. intensities
bool calc_compare(const std::shared_ptr<Calc> &a, const std::shared_ptr<Calc> &b)
{
	if (SortByE && a->Ecalc < b->Ecalc) {
		return true;
	} else if (!SortByE && a->Icalc > b->Icalc) {
		return true;
	}
	return false;
}
/*
TCalcWnd::TCalcWnd(PTWindowsObject AParent, LPSTR ATitle):
TWindow(AParent, ATitle)
{
	Attr.Style |= WS_VSCROLL | WS_HSCROLL;
	Scroller = new TScroller(this, 8, 15, 100, 100);
	Scroller->AutoMode = TRUE;
	CalcData = new TEIColl(50, 10);
}

TCalcWnd::~TCalcWnd()
{
	delete CalcData;
	delete Scroller;
}

void TCalcWnd::SetupWindow()
{
	TWindow::SetupWindow();
	switch (phaseno)
	{
	case 1: SetCaption("Phase I - Calculated Energies and Intensities"); break;
	case 2: SetCaption("Phase II - Calculated Energies and Intensities"); break;
	case 3: SetCaption("Phase III - Calculated Energies and Intensities"); break;
	case 4: SetCaption("Phase IV - Calculated Energies and Intensities"); break;
	case 5: SetCaption("Phase V - Calculated Energies and Intensities"); break;
	default: SetCaption("Calculated Energies and Intensities"); break;
	}
}
void TCalcWnd::KeyInput(RTMessage Msg)
{
	int ScanCode = MapVirtualKey(Msg.WParam, 0);
	DefWndProc(Msg);
	switch(ScanCode)
	{
	case 0x50: Scroller->ScrollBy(0, 1); break;
	case 0x48: Scroller->ScrollBy(0, -1); break;
	case 0x47: Scroller->ScrollTo(0, 0); break;
	case 0x51: Scroller->ScrollBy(0, 20); break;
	case 0x49: Scroller->ScrollBy(0, -20); break;
	default: SendMessage(Parent->HWindow, WM_KEYDOWN, Msg.WParam, Msg.LParam);
	}
}*/

CalcWnd::CalcWnd(QWidget *parent)
	: QWidget(parent), CalcData(calc_compare)
{
    setPalette(QPalette(QColor(255, 255, 255)));
    setAutoFillBackground(true);
	setAttribute(Qt::WA_NativeWindow);

	phaseno = 0;
	pix = 0;
	redrawPixmap = true;
}

QSize CalcWnd::sizeHint() const
{
	return QSize(700, 500);
}

void CalcWnd::Reinitialize()
{
	NewPhase(1);
}

void CalcWnd::SortByEnergy(bool yesno)
{
	CALC TempSort(calc_compare);
	Calc *C1, *C2;

	if (SortByE != yesno)
	{
		SortByE = yesno;
		for (CALC::iterator iter = CalcData.begin(); iter != CalcData.end(); iter++)
		{
			C1 = (*iter).get();
			C2 = new Calc(C1->h, C1->k, C1->l);
			C2->Eobs = C1->Eobs;
			C2->Iobs = C2->Iobs;
			C2->Ecalc = C1->Ecalc;
			C2->Icalc = C1->Icalc;
			std::shared_ptr<Calc> ptr(C2);
			TempSort.insert(ptr);
		}
		CalcData.clear();
		for (CALC::iterator iter = TempSort.begin(); iter != TempSort.end(); iter++)
		{
			C1 = (*iter).get();
			C2 = new Calc(C1->h, C1->k, C1->l);
			C2->Eobs = C1->Eobs;
			C2->Iobs = C2->Iobs;
			C2->Ecalc = C1->Ecalc;
			C2->Icalc = C1->Icalc;
			std::shared_ptr<Calc> ptr(C2);
			CalcData.insert(ptr);
		}
		this->RedrawPixmap();
	}
}

void CalcWnd::NewPhase(int PhaseNo)
{
	phaseno = PhaseNo;
	CalcData.clear();
	switch (phaseno)
	{
	case 1: emit windowTitleChanged("Phase I - Calculated Energies and Intensities"); break;
	case 2: emit windowTitleChanged("Phase II - Calculated Energies and Intensities"); break;
	case 3: emit windowTitleChanged("Phase III - Calculated Energies and Intensities"); break;
	case 4: emit windowTitleChanged("Phase IV - Calculated Energies and Intensities"); break;
	case 5: emit windowTitleChanged("Phase V - Calculated Energies and Intensities"); break;
	case 6: emit windowTitleChanged("Phase VI - Calculated Energies and Intensities"); break;
	default: emit windowTitleChanged("Calculated Energies and Intensities"); break;
	}
	this->RedrawPixmap();
}

void CalcWnd::RedrawPixmap()
{
	this->update();
	redrawPixmap = true;
}

void CalcWnd::RedrawPixmap(const QRect &rect)
{
	this->update(rect);
	redrawPixmap = true;
}

void CalcWnd::paintEvent(QPaintEvent *e)
{
	/*if (redrawPixmap) {
		DoRedrawPixmap(e->rect());
		redrawPixmap = false;
	}
	QPainter p(this);
	p.drawPixmap(e->rect(), *pix, e->rect());*/

	DoRedrawPixmap(e->rect());
}

void CalcWnd::DoRedrawPixmap(const QRect &rect)
{
	/*char buf[256];
	int XI = 40, YI = 58;

	PAINTSTRUCT ps;
	ps.rcPaint.left = rect.left();
	ps.rcPaint.top = rect.top();
	ps.rcPaint.right = rect.right();
	ps.rcPaint.bottom = rect.bottom();

	// Create new pixmap (Note : each item is 17 pixels in height)
	delete pix;
	int WndY = 51+(int)ceil(CalcData.size()*17.0/2.0);
	if (WndY < Wnd->scrollCalc->size().height()) {
		WndY = Wnd->scrollCalc->size().height();
	}
	pix = new QPixmap(800, WndY);
	this->resize(pix->size());

	QPainter p(pix);

	p.fillRect(pix->rect(), QBrush(QColor(255,255,255)));

	p.setPen(QPen(QBrush(QColor(0, 0, 0)), 3));
	p.drawLine(2, 35, 1000, 35);
	p.drawLine(325, 25, 325, 1500);

	p.setFont(QFont("Arial", 9, QFont::Bold));
	p.drawText(40, 26, "hkl");
	p.drawText(90, 26, "E calc");
	p.drawText(140, 26, "E obs");
	p.drawText(190, 26, "I calc");
	p.drawText(240, 26, "I obs");
	p.drawText(350, 26, "hkl");
	p.drawText(400, 26, "E calc");
	p.drawText(450, 26, "E obs");
	p.drawText(500, 26, "I calc");
	p.drawText(550, 26, "I obs");

	p.setFont(QFont("Arial", 9, QFont::Normal));

	int calcSize = CalcData.size();
	CALC::const_iterator iter = CalcData.begin();
	for (int i = 0; iter != CalcData.end() && i < 0.5*calcSize; iter++, i++)
	{
		Calc *C = (*iter).get();
		sprintf(buf, "%d%d%d", C->h, C->k, C->l);
		p.drawText(XI, YI, buf);
		sprintf(buf, "%6.3f", C->Ecalc);
		p.drawText(XI+50, YI, buf);
		if (C->Eobs != 0) {
			sprintf(buf, "%6.3f", C->Eobs);
		} else {
			strcpy(buf, "  -");
		}
		p.drawText(XI+100, YI, buf);
		sprintf(buf, "%6.3f", C->Icalc);
		p.drawText(XI+150, YI, buf);
		if (C->Iobs != 0) {
			sprintf(buf, "%6.3f", C->Iobs);
		} else {
			strcpy(buf, "  -");
		}
		p.drawText(XI+200, YI, buf);
		YI += 17;
	}
	XI = 350;
	YI = 58;
	for (; iter != CalcData.end(); iter++)
	{
		Calc *C = (*iter).get();
		sprintf(buf, "%d%d%d", C->h, C->k, C->l);
		p.drawText(XI, YI, buf);
		sprintf(buf, "%6.3f", C->Ecalc);
		p.drawText(XI+50, YI, buf);
		if (C->Eobs != 0) {
			sprintf(buf, "%6.3f", C->Eobs);
		} else {
			strcpy(buf, "  -");
		}
		p.drawText(XI+100, YI, buf);
		sprintf(buf, "%6.3f", C->Icalc);
		p.drawText(XI+150, YI, buf);
		if (C->Iobs != 0) {
			sprintf(buf, "%6.3f", C->Iobs);
		} else {
			strcpy(buf, "  -");
		}
		p.drawText(XI+200, YI, buf);
		YI += 17;
	}*/

	int i;
	LOGFONT LogFont;
	HFONT Font, OldFont;
	HPEN Pen, OldPen;
	char buf[100];
	int XI = 50, YI = 50;
	Calc *C;

	// Calculate the size of the widget for holding all items
	// Each item is 17 pixel long
	int ContentY = 51+CalcData.size()*17;
	int WndY = Wnd->calcWnd->size().height()-48;

	this->resize(800, max(ContentY, WndY));

	// Prepare the backbuffer for drawing
	QPainter p(this);

    HWND hwnd = (HWND)p.paintEngine();
    HDC PaintDC = GetDC(hwnd);
    //HDC PaintDC = p.paintEngine()->getDC();

	QPoint wnd = mapTo(window(), QPoint(0,0));
	POINT org;
	GetDCOrgEx(PaintDC, &org);
	SetViewportOrgEx(PaintDC, wnd.x(), wnd.y(), &org);

	qDebug() << "Time: " << QTime::currentTime();
	qDebug() << "wnd: " << wnd;
	qDebug() << "size(): " << size();

	// Set the clipping region
	HRGN hrgn = CreateRectRgn(rect.left()+wnd.x(), rect.top()+wnd.y(),
		rect.right()+wnd.x()+1, rect.bottom()+wnd.y()+1);
	SelectClipRgn(PaintDC, hrgn);

	LogFont.lfHeight = 15;
	LogFont.lfWidth = 0;
	LogFont.lfEscapement = 0;
	LogFont.lfOrientation = 0;
	LogFont.lfWeight = FW_NORMAL;
	LogFont.lfItalic = 0;
	LogFont.lfUnderline = 0;
	LogFont.lfStrikeOut = 0;
	LogFont.lfCharSet = ANSI_CHARSET;
	LogFont.lfOutPrecision = OUT_DEFAULT_PRECIS;
	LogFont.lfClipPrecision = CLIP_DEFAULT_PRECIS;
	LogFont.lfQuality = DEFAULT_QUALITY;
	LogFont.lfPitchAndFamily = VARIABLE_PITCH | FF_DONTCARE;
	strcpy(LogFont.lfFaceName, "TIMES");
	Font = CreateFontIndirect(&LogFont);        // create font
	Pen = CreatePen(PS_SOLID, 3, 0x00000000);	// create pen
	OldPen = (HPEN) SelectObject(PaintDC, Pen);
	MoveToEx(PaintDC, 2, 35, 0);
	LineTo(PaintDC, 1000, 35);
	MoveToEx(PaintDC, 325, 25, 0);
	LineTo(PaintDC, 325, max(ContentY, WndY));
	SelectObject(PaintDC, OldPen);
	DeleteObject(Pen);                          // delete pen
	OldFont = (HFONT) SelectObject(PaintDC, Font);
	strcpy(buf, "hkl");
	TextOut(PaintDC, 50, 15, buf, strlen(buf));
	strcpy(buf, "E calc");
	TextOut(PaintDC, 100, 15, buf, strlen(buf));
	strcpy(buf, "E obs");
	TextOut(PaintDC, 150, 15, buf, strlen(buf));
	strcpy(buf, "I calc");
	TextOut(PaintDC, 200, 15, buf, strlen(buf));
	strcpy(buf, "I obs");
	TextOut(PaintDC, 250, 15, buf, strlen(buf));
	strcpy(buf, "hkl");
	TextOut(PaintDC, 350, 15, buf, strlen(buf));
	strcpy(buf, "E calc");
	TextOut(PaintDC, 400, 15, buf, strlen(buf));
	strcpy(buf, "E obs");
	TextOut(PaintDC, 450, 15, buf, strlen(buf));
	strcpy(buf, "I calc");
	TextOut(PaintDC, 500, 15, buf, strlen(buf));
	strcpy(buf, "I obs");
	TextOut(PaintDC, 550, 15, buf, strlen(buf));

	int calcSize;
	CALC::const_iterator iter;
	for (i = 0, iter = CalcData.begin(), calcSize = CalcData.size();
		iter != CalcData.end() && i < 0.5*calcSize;
		iter++, calcSize++)
	{
		C = (*iter).get();
		sprintf(buf, "%d%d%d", C->h, C->k, C->l);
		TextOut(PaintDC, XI, YI, buf, strlen(buf));
		sprintf(buf, "%6.3f", C->Ecalc);
		TextOut(PaintDC, XI+50, YI, buf, strlen(buf));
		if (C->Eobs != 0)
			sprintf(buf, "%6.3f", C->Eobs);
		else strcpy(buf, "  -");
		TextOut(PaintDC, XI+100, YI, buf, strlen(buf));
		sprintf(buf, "%6.3f", C->Icalc);
		TextOut(PaintDC, XI+150, YI, buf, strlen(buf));
		if (C->Iobs != 0)
			sprintf(buf, "%6.3f", C->Iobs);
		else strcpy(buf, "  -");
		TextOut(PaintDC, XI+200, YI, buf, strlen(buf));
		YI += 17;
	}
	XI = 350;
	YI = 50;
	for (; iter != CalcData.end(); iter++)
	{
		C = (*iter).get();
		sprintf(buf, "%d%d%d", C->h, C->k, C->l);
		TextOut(PaintDC, XI, YI, buf, strlen(buf));
		sprintf(buf, "%6.3f", C->Ecalc);
		TextOut(PaintDC, XI+50, YI, buf, strlen(buf));
		if (C->Eobs != 0)
			sprintf(buf, "%6.3f", C->Eobs);
		else strcpy(buf, "  -");
		TextOut(PaintDC, XI+100, YI, buf, strlen(buf));
		sprintf(buf, "%6.3f", C->Icalc);
		TextOut(PaintDC, XI+150, YI, buf, strlen(buf));
		if (C->Iobs != 0)
			sprintf(buf, "%6.3f", C->Iobs);
		else strcpy(buf, "  -");
		TextOut(PaintDC, XI+200, YI, buf, strlen(buf));
		YI += 17;
	}
	SelectObject(PaintDC, OldFont);
	DeleteObject(Font);									// delete font
	
	// Restore viewport state
	SetViewportOrgEx(PaintDC, org.x, org.y, 0);

	// Release backbuffer handle
    //p.paintEngine()->releaseDC(PaintDC);
    ReleaseDC(hwnd, PaintDC);
}

returns the issues:

undefined reference to '__imp_GetDCOrgEx'            line 333
undefined reference to '__imp_SetViewportOrgEx'      line 334 and 438
undefined reference to '__imp_CreateRectRgn'         line 342
undefined reference to '__imp_SelectClipRgn'         line 343
undefined reference to '__imp_CreateFontIndirectA'   line 359
undefined reference to '__imp_CreatePen'             line 360
undefined reference to '__imp_SelectObject'          line 361, 366, 368 and 434
undefined reference to '__imp_MoveToEx'              line 362 and 364
undefined reference to '__imp_LineTo'                line 363 and 365
undefined reference to '__imp_DeleteObject'          line 367 and 435
undefined reference to '__imp_TextOutA'              all calls from line 370 to 431

Note: This is the code of an unfinished version because the final version was lost.

I have no idea what to fix these issues.
I'm new to Qt and relatively new to C++.
Thanks in advance.

[Bonnie]

Those are all Windows GDI APIs.
It seems that you haven't linked Gdi32.lib to your project.

[lucbaz]

It works.
Thank you so much.