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C++中的union結(jié)構(gòu)體怎么轉(zhuǎn)換成C#？

C++

陪伴而非守候 2019-03-22 19:14:52

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白豬掌柜的

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[StructLayout(LayoutKind.Explicit, Size=2)]

struct TokenValue

{

[FieldOffset(0)]

[MarshalAs(UnmanagedType.U1)]

public byte _cval;

[FieldOffset(1)]

[MarshalAs(UnmanagedType.U1)]

public byte _ival;

[FieldOffset(0)]

public ushort flags;

}

反對回復(fù) 2019-03-27

慕桂英4014372

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        public struct dash_generic_param
        {
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 30)]
            public short[] raw_data;
        }
        //public struct dash_generic_param
        //{
        //    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
        //    public ushort[] values;
        //    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 11)]
        //    public ushort[] reserved;
        //    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
        //    public ushort[] limit;
        //}
        // 結(jié)構(gòu)體按你需求，2選1
        public struct DashParamPacket {	
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 34)]
            public ushort[] raw_data;
        }
        //public struct DashParamPacket {	
        //     public ushort pre_id;
        //     public byte token;
        //     public byte r1;
        //     public dash_generic_param data;
        //     public byte major_id;
        //     public byte minor_id;
        //     public ushort r2;
        //}

        // 例如c++庫里接口名為GetPacket，DashParamPacket是c#定義的與C++中內(nèi)存對齊的結(jié)構(gòu)體
        [DllImport("xxx.dll")]
        public static extern bool GetPacket(ref DashParamPacket parm);

        static void Main(string[] args)
        {
            DashParamPacket param = new DashParamPacket(); // C#里的結(jié)構(gòu)體
            GetPacket(ref param); // 如果C++接口定義的結(jié)構(gòu)體指針，可以直接用引用

            // 如果需要轉(zhuǎn)void*使用，可以用marhal庫來回轉(zhuǎn)
            IntPtr p = In

反對回復(fù) 2019-03-27