You have a structure that takes a byte array 

byte[]

however, the size of that array depends on the image you are submitting (widthxheight)

So... how do you do 

[MarshalAs(UnmanagedType.ByValArray, SizeConst = ???)]
public Byte[] ImageData;

Is the sizeconst a MUST HAVE when working with byte arrays being passed from C# to C dlls?

c# arrays size marshalling
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