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how to get IntPtr data from byte[]

there are already image data in byte[] arr, 3 channels of bmp file, and also a MIplImage raw reated for it. how to get raw.imageData from arr? using CvInvoke.cvSetData() failed, as 2 parameters both need IntPtr type; using Marshal.StructureToPtr() passed compile, but crush when runs, indicates "Specify the structure must be able to directly copied to the unit structure, or has the layout information" so, how can I get the imagedata of byte[] into IntPtr for MIplImage?