ucrtbased.dll: Access Violation - c++

Question

I am writing an extension (that is compiled as dynamic library), and I get extension error. Unfortunately, I have to draw entire GUI by myself, unfortunately, in pretty raw GDI/WinAPI.
This is my code that crashes:
Slider::Slider(const char* objectId, int height, POINT topLeft, int visibleElements, int totalElements, int elementHeight, EuroScopePlugIn::CRadarScreen* rs)
{
// Member variable initailization
m_ObjectId = objectId;
m_Height = height;
m_TopLeft = topLeft;
m_VisibleElements = visibleElements;
m_ElementHeight = elementHeight;
m_TotalElements = totalElements;
m_Width = 10;
m_pRS = rs;
m_CurrentFirstElement = 0;
m_CurrentLastElement = m_CurrentFirstElement + visibleElements;
}
SliderGrip::SliderGrip(Slider* sliderObject) : Slider(m_ObjectId.c_str(), m_Height, m_TopLeft, m_VisibleElements, m_TotalElements, m_ElementHeight, m_pRS)
{
// Base class member variable initialization
{
m_ObjectId = sliderObject->m_ObjectId;
m_Height = sliderObject->m_Height;
m_TopLeft = sliderObject->m_TopLeft;
m_VisibleElements = sliderObject->m_VisibleElements;
m_ElementHeight = sliderObject->m_ElementHeight;
m_TotalElements = sliderObject->m_TotalElements;
m_Width = sliderObject->m_Width;
m_pRS = sliderObject->m_pRS;
m_CurrentFirstElement = sliderObject->m_CurrentFirstElement;
m_CurrentLastElement = sliderObject->m_CurrentLastElement;
}
m_GripHeight = (m_VisibleElements / m_TotalElements) * m_ElementHeight;
m_GripTopLeft = (CPoint)(m_TopLeft.x, m_TopLeft.y + 10 + (m_CurrentFirstElement * m_ElementHeight));
}
void SliderGrip::RenderGrip(CDC* dc)
{
// localObjectId
std::string localObjectId = "Grip";
// Save DC for later
int sDC = dc->SaveDC();
// Create CRectangle
CRect CRectangle(m_GripTopLeft.x, m_GripTopLeft.y, m_GripTopLeft.x + m_Width, m_GripTopLeft.y + m_GripHeight);
// Grip Color
COLORREF m_GripColor = RGB(0, 0, 0);
// Fill CRectangle with CBrush
CBrush RectangleFill(m_GripColor);
dc->FillRect(&CRectangle, &RectangleFill);
m_pRS->AddScreenObject(CELEMENTS::SCROLLBAR_GRIP, localObjectId.c_str(), CRectangle, 1, "");
// Restore DC
dc->RestoreDC(sDC);
// Cleaning
DeleteObject(RectangleFill);
}
SliderTrack::SliderTrack(Slider* sliderObject) : Slider(m_ObjectId.c_str(), m_Height, m_TopLeft, m_VisibleElements, m_TotalElements, m_ElementHeight, m_pRS)
{
// Base class member variable initialization
{
m_ObjectId = sliderObject->m_ObjectId;
m_Height = sliderObject->m_Height;
m_TopLeft = sliderObject->m_TopLeft;
m_VisibleElements = sliderObject->m_VisibleElements;
m_ElementHeight = sliderObject->m_ElementHeight;
m_TotalElements = sliderObject->m_TotalElements;
m_Width = sliderObject->m_Width;
m_pRS = sliderObject->m_pRS;
m_CurrentFirstElement = sliderObject->m_CurrentFirstElement;
m_CurrentLastElement = sliderObject->m_CurrentLastElement;
}
m_TrackHeight = m_VisibleElements * m_ElementHeight;
m_TrackTopLeft = (CPoint)(m_TopLeft.x, m_TopLeft.y + 10);
}
void SliderTrack::RenderTrack(CDC* dc)
{
// Save DC for later
int sDC = dc->SaveDC();
// CRectangle
CRect CRectangle(m_TrackTopLeft.x, m_TrackTopLeft.y, m_TrackTopLeft.x + m_Width, m_TrackTopLeft.y + m_TrackHeight);
// Color
COLORREF m_TrackColor = RGB(200, 200, 200);
// Fill CRectangle with CBrush
CBrush RectangleFill(m_TrackColor);
dc->FillRect(&CRectangle, &RectangleFill);
// Restore DC
dc->RestoreDC(sDC);
// Cleaning
DeleteObject(RectangleFill);
}
SliderButton::SliderButton() : Slider(m_ObjectId.c_str(), m_Height, m_TopLeft, m_VisibleElements, m_TotalElements, m_ElementHeight, m_pRS)
{
}
[...]
#pragma region Scrollbar
// Scrollbar -> Elements::Slider --- grip, track, buttonup, buttondown
Scrollbar::Scrollbar(const char* name, EuroScopePlugIn::CRadarScreen* rs, POINT topLeft, int height, int visibleElements, int totalElements, int elementHeight)
{
// member Var initialization
m_Name = name;
m_pRS = rs;
m_TopLeft = topLeft;
m_Height = height;
m_Width = 10;
m_VisibleElements = visibleElements;
m_TotalElements = totalElements;
m_ElementHeight = elementHeight;
// initialize objects
sliderObject = new CInterface::Slider(m_Name.c_str(), m_Height, m_TopLeft, m_VisibleElements, m_TotalElements, m_ElementHeight, m_pRS);
gripObject = new CInterface::SliderGrip(sliderObject);
trackObject = new CInterface::SliderTrack(sliderObject);
}
void Scrollbar::AddTotalElements()
{
m_TotalElements++;
}
void Scrollbar::AddTotalElements(int count)
{
m_TotalElements += count;
}
void Scrollbar::RemoveTotalElements()
{
if(m_TotalElements>0)
m_TotalElements--;
}
void Scrollbar::RemoveTotalElements(int Count)
{
if (m_TotalElements > Count)
m_TotalElements -= Count;
}
void Scrollbar::Render(CDC* dc)
{
// for later
int sDC = dc->SaveDC();
gripObject->RenderGrip(dc);
trackObject->RenderTrack(dc);
// restore
dc->RestoreDC(sDC);
}
Scrollbar::~Scrollbar()
{
delete sliderObject;
delete gripObject;
delete trackObject;
}
#pragma endregion Scrollbar
Later on, code is called from main app in this way:
CallingFunction()
{
testScroll = new CInterface::Scrollbar("testScroll", this, xyz, 50, 10, 50, 5);
}
~CallingFunction()
{
delete testScroll;
}
Until now, code doesn't crash, but once I call rendering functions:
OnRender(HDC hDC)
{
CDC dc;
dc.Attach(hDC);
testScroll->Render(&dc);
dc.Detach();
dc.DeleteDC();
}
App crashes on startup with given code error:
Exception thrown at 0x78F6FF5C (ucrtbased.dll) in EuroScope.exe: 0xC0000005: Access violation reading location 0xCDCDCDCD.
I have no clue what's causing this, any ideas? I am roughly sure it may be issue with some pointer and/or passed const char*. While I tried to replace const char* to std::string whenever possible, I got an similar error, but related to vcruntime140.dll...