c# - C# 中的结构编码(marshal)

Question

我在 C# 中有以下结构

unsafe public struct control
    {
        public int bSetComPort;
        public int iComPortIndex;
        public int iBaudRate;
        public int iManufactoryID;
        public byte btAddressOfCamera;
        public int iCameraParam;
        public byte PresetNum;
        public byte PresetWaitTime;
        public byte Group;
        public byte AutoCruiseStatus;
        public byte Channel;
        public fixed byte Data[64];
    }

我用来将其转换为字节数组[]的函数是

 static byte[] structtobyte(object obj)
    {
        int len = Marshal.SizeOf(obj);
        byte[] arr = new byte[len];
        IntPtr ptr = Marshal.AllocHGlobal(len);
        Marshal.StructureToPtr(obj, ptr, true);
        Marshal.Copy(ptr, arr, 0, len);
        Marshal.FreeHGlobal(ptr);
        return arr;
    }

当我编译时它给出

Type 'System.Byte[]' cannot be marshaled as an unmanaged structure; no meaningful size or offset can be computed.

可能是什么问题？ 提前致谢!

Answer 1

SizeOf 不适用于数组。请改用 array.Length * Marshal.SizeOf(elementType)。