C#中的struct marshal

时间:2011-06-18 22:39:45

标签: c# arrays interop struct marshalling

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;
    }

当我编译它时给出

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? 提前谢谢!

2 个答案:

答案 0 :(得分:4)

SizeOf不在数组上工作。请改用array.Length * Marshal.SizeOf(elementType)

答案 1 :(得分:-1)

您报告为编译错误的错误实际上是运行时错误(ArgumentException)。如果您想使用structtobytecontrol转换为byte[],则应该向该方法传递对control的引用,而不是byte数组({{1} }})。

byte[]