Question

I am trying to create the structure below in C# so I can communicate with my Lumenera CCD. The code below is taken from the c++ header file. The main problem is the anonymous union and nested struct part. Any help you be greatly appreciated. An equivalent example would be awesome.

typedef struct {
        FLOAT exposure;        
        FLOAT gain;            
        union {
         struct {
          FLOAT gainRed;     
          FLOAT gainBlue;     
          FLOAT gainGrn1;     
          FLOAT gainGrn2;     
         };
         struct {
          FLOAT gainMag;     
          FLOAT gainCyan;     
          FLOAT gainYel1;     
          FLOAT gainYel2;    
         };
        };
      union
      {
           BOOL useStrobe;        
         ULONG strobeFlags;   
      };

} LUCAM_SNAPSHOT;

Answer 1

[StructLayout(LayoutKind.Explicit)] 
public struct LUCAM_SNAPSHOT
{
    [FieldOffset(0)] public float exposure;
    [FieldOffset(4)] public float gain;
    [FieldOffset(8)] public float gainRed;
    [FieldOffset(8)] public float gainGrn1;
    [FieldOffset(8)] public float gainGrn2;
    [FieldOffset(12)] public float gainMag;
    [FieldOffset(12)] public float gainGrn1;
    [FieldOffset(12)] public float gainGrn2;
    [FieldOffset(12)] public float gainMag;
    [FieldOffset(16)] public byte useStrobe;
    [FieldOffset(16)] public int strobeFlags;
}

I think it might be something like the above. I have not tried it out, but at least you have a starting point.