On the one hand you can have several declarations/imports of
cmsDoTransform e.g.:
public static class NativeMethods {
[DllImport("lcms2.dll")]
public static extern void cmsDoTransform(
[In] IntPtr Transform,
[In] byte[] InputBuffer,
[Out] byte[] OutputBuffer,
[In] UInt32 Size);
[DllImport("lcms2.dll")]
public static extern void cmsDoTransform(
[In] IntPtr Transform,
[In] ushort[] InputBuffer,
[Out] ushort[] OutputBuffer,
[In] UInt32 Size);
[DllImport("lcms2.dll")]
public static extern void cmsDoTransform(
[In] IntPtr Transform,
[In] double[] InputBuffer,
[Out] double[] OutputBuffer,
[In] UInt32 Size);
}
on the other hand you could just use the version with byte[]:
In this case you would have to "marshal" your float/double/short data to
byte[] yourself.
If you have some e.g. double data somewhere in a stream, file, blob, and
c# is passing
this binary data as byte[] to you, you can use this version.
Of course you can also take a "simple" declaration with IntPtr and do some
System.Runtime.InteropServices.Marshal.PtrToStructure(),
.StructureToPtr(), .Copy()...
before and after calling cmsDoTransform.
I prefer the first/second way
Edgar
Am 30.06.2016 um 16:41 schrieb Roger Breton:
> Edgar,
>
> Thank YOU so much!!!!
>
> One question...
>
> In the following code :
>
> public static class NativeMethods {
> [DllImport("lcms2.dll")]
> public static extern void cmsDoTransform(
> [In] IntPtr Transform,
> [In] byte[] InputBuffer,
> [Out] byte[] OutputBuffer,
> [In] UInt32 Size);
> }
>
> Why (warum) do you pass a pointer to a byte array (byte[])?
>
> (I understand image pixel data = bytes)
>
> I am no C# specialist BUT that makes the function "less universal" than if
> you were to pass a straight, basic 'IntPtr'?
>
> The reason I ask is, are you not limited to the type of data you can pass
> cmsDoTransform then?
>
> In my original pinvoke declaration, I use pointers to 'double[]' arrays :
> this will not work (arbeit) with your 'byte[]' declaration anymore?
>
> I was thinking of, perhaps, the solution is create a second class to host
> your cmsDoTransform function call and continue using my first cmsDoTransform
> to process individual 'double[]' data type.
>
> Is that what you do?
>
> MfG / Kindest regards,
>
> / Roger Breton
>
>
>
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