is this code mfc or api or openGL etc.?

I've never come across this type of source code before? What is it called and are there tutorials explaining what the functions mean?

Code:

CB3::~CB3()
{

}

void CB3::Draw(CDC *pDC)
{
	/*******************************/
	// Place your drawing code here. 
	// Examples are given below.
	/*******************************/



	// Select a solid black (black = RGB(0,0,0)) pen with a width of 1 pixel.
	int penWidth = 1;
	CPen pen(PS_SOLID,penWidth,RGB(0,0,0));


	// Store the previous pen and set the current pen for drawing on the screen.
	CPen *ppen=pDC->SelectObject(&pen);


	// Select a solid blue (blue = RGB(0,0,255)) brush to fill an enclosed area.
	CBrush brush(RGB(0,0,255));

	// You can select other fill patterns, such as HS_BDIAGONAL, 
	// HS_CROSS, HS_DIAGCROSS, HS_FDIAGONAL, HS_HORIZONTAL, HS_VERTICAL.
	// The following line selects a HS_CROSS brush
	// CBrush brush(HS_CROSS, RGB(0,0,255));


	// Store the previous brush and set the current brush for painting.
	CBrush *pbrush=pDC->SelectObject(&brush);


	// Draw a rectangle 
	pDC->Rectangle(70,20,120,120);


	// Draw a round rectangle 
	pDC->RoundRect(150,20,200,120,10,15);


	// Draw an ellipse
	pDC->Ellipse(220,20, 280,120);

	// Draw a polygon with 5 vertices.
	CPoint *vertices = new CPoint[5];
	vertices[0].x = 300; vertices[0].y = 50; 
	vertices[1].x = 330; vertices[1].y = 20; 
	vertices[2].x = 370; vertices[2].y = 40;
	vertices[3].x = 440; vertices[3].y = 30;
	vertices[4].x = 380; vertices[4].y = 120; 
	pDC->Polygon(vertices,5);


	delete vertices;

	// Recover the previous pen and delete the current pen.
	pDC->SelectObject(ppen);
	pen.DeleteObject();

	
	// Recover the previous brush and delete the current brush.
	pDC->SelectObject(pbrush);
	brush.DeleteObject();
}

It's c++ GDI class.

Look up the functions on MSDN ... Google is your friend.

It's (broken) MFC, the M stands for Microsoft, so do as the man says and search MSDN

Why do you say its broken?