CWnd::IsIconic
BOOL IsIconic( ) const;
Return Value
Nonzero if CWnd is minimized; otherwise 0.
Remarks
Specifies whether CWnd is minimized (iconic).
Example

// This code, normally emitted by the AppWizard for a dialog-based
// project for the dialog’s WM_PAINT handler, runs only if the
// window is iconic. The window erase the icon’s area, then
// paints the icon referenced by m_hIcon.
if (IsIconic())
{
[...]