Determine whether the class object is valid for painting bitmaps.
|TRUE||The LDraw object is valid.|
|FALSE||The LDraw object is not valid.|
Before you can use any of the painting functions, a bitmap and a device context must be associated with the class object. Until you have associated a bitmap and a device context with the LDraw object, the object is considered invalid.
For an example, refer to LDraw::SetBitmap.
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