CSize SetBitmapDimension( int nWidth, int nHeight );
nWidth
Specifies the width of the bitmap (in 0.1-millimeter units).
nHeight
Specifies the height of the bitmap (in 0.1-millimeter units).
Assigns a width and height to a bitmap in 0.1-millimeter units. These values are not used internally by GDI; the GetBitmapDimension function can be used to retrieve them.
The previous bitmap dimensions. Height is in the cy member variable of the CSize object, and width is in the cx member variable.
CBitmap::GetBitmapDimension, ::SetBitmapDimension