GDI object (is a graphical device object) used to write on a

device context for graphical output.

GDI objects are: Pen, Brush, Font,Line, Rectangle etc.

These objects are created using their corresponding win32

function. For eg, CreatePen, CreatePenIndirect are used to

create a pen object.

After these objects are created they would need to be

selected to the device context before processing using

"SelectObject" function.

GDI objects are not associated with any device context

during its creation. SelectObject function does that

assocaition.

Once an object is selected into the device context it would

be available until the object is destroyed through

DeleteObject or the program exits.