C#中的struct 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];
    }

我用来将它转换为字节数组[]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;
    }

当我编译它给

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

您报告为编译错误的错误实际上是运行时错误（ ）ArgumentException。当您想要使用structtobyte将 a 转换control为时byte[]，您应该向该方法传递对 的引用control，而不是byte数组 ( byte[])。

control ctrl = new control();
byte[] bytes = structtobyte(ctrl);