C＃中的struct marshal

Question

我在C＃中有以下結構

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];
    }

我用來將它轉換為字節數組[]的函數是

 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;
    }

當我編譯它給

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

可能是什么問題？ 提前致謝！

Answer 1

SizeOf不適用於數組。 請改用array.Length * Marshal.SizeOf(elementType) 。

Answer 2

您報告為編譯錯誤的錯誤實際上是運行時錯誤（ ArgumentException ）。 如果要使用structtobyte將control轉換為byte[] ，則應該將方法傳遞給control ，而不是byte數組（ byte[] ）。

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