The ilutConvertToHBitmap function returns a Windows-friendly bitmap handle.

hDC

The device context that you want to receive the HBITMAP.

ilutConvertToHBitmap creates a Windows bitmap handle (HBITMAP) copy of the current image, for direct use in Windows.

ILUT_ILLEGAL_OPERATION - There is currently no image bound. Use ilGenImages and ilBindImage before calling this function.
ILUT_OUT_OF_MEMORY - Could not allocate enough memory for the new bitmap.

ilGenImages, ilBindImage, ilutGetHPal