Qt + WINAPI + direct painting

[JovianGhost]

I'm experimenting with direct painting to device contexts using WINAPI. Here's what my widget's paintEvent function looks like:

void ShotView::paintEvent(QPaintEvent *event)
{
    qDebug() << "Start paint function";
 
    HDC hdc = this->getDC();
 
    if (hdc == NULL)
    {
        qDebug() << "HDC error";
        return;
    }
 
    qDebug() << "Start painting";
 
    HPEN hPen = CreatePen(PS_SOLID, 4, RGB(0, 255, 0));
    if (hPen == NULL)
        qDebug() << "CreatePen error";
    if (SelectObject(hdc, hPen) == HGDI_ERROR)
        qDebug() << "SelectObject error";
    if (MoveToEx(hdc, 0, 0, NULL) == 0)
        qDebug() << "MoveToEx error";
    if (LineTo(hdc, 200, 200) == 0)
        qDebug() << "LineTo error";
 
    qDebug() << "End painting";
 
    this->releaseDC(hdc);
 
    qDebug() << "End paint function";
}

void ShotView::paintEvent(QPaintEvent *event)
{
    qDebug() << "Start paint function";

    HDC hdc = this->getDC();

    if (hdc == NULL)
    {
        qDebug() << "HDC error";
        return;
    }

    qDebug() << "Start painting";

    HPEN hPen = CreatePen(PS_SOLID, 4, RGB(0, 255, 0));
    if (hPen == NULL)
        qDebug() << "CreatePen error";
    if (SelectObject(hdc, hPen) == HGDI_ERROR)
        qDebug() << "SelectObject error";
    if (MoveToEx(hdc, 0, 0, NULL) == 0)
        qDebug() << "MoveToEx error";
    if (LineTo(hdc, 200, 200) == 0)
        qDebug() << "LineTo error";

    qDebug() << "End painting";

    this->releaseDC(hdc);

    qDebug() << "End paint function";
}

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When I run the program, I don't see a solid red line appearing as I should. The console output seems correct:

Start paint function
Start painting
End painting
End paint function

so it looks like everything in the function is getting called properly, but I don't see an output. It's been a while since I've done WINAPI stuff, but I think I have it right. Can anyone offer any insight?