Memcpy, blockcopy的進一步理解

using System; using System.Runtime.InteropServices; using System.IO; namespace tx {struct ST{public byte c1;public float x;public int y;}class Ct{[DllImport("msvcrt.dll", EntryPoint = "memcpy", CallingConvention = CallingConvention.Cdecl, SetLastError = false)]public static extern void MemCopy(byte[] dest, byte[] src, int count);//字節數組到字節數組的拷貝 [DllImport("msvcrt.dll", EntryPoint = "memcpy", CallingConvention = CallingConvention.Cdecl, SetLastError = false)]public static extern void MemCopy(int[] dest, byte[] src, int count);//字節數組到整形數組的拷貝 [DllImport("msvcrt.dll", EntryPoint = "memcpy", CallingConvention = CallingConvention.Cdecl, SetLastError = false)]public unsafe static extern void MemCopy(ref ST dest, byte[] src, int count);//注意只有結構體能這么做,class不可以 [DllImport("msvcrt.dll", EntryPoint = "memcpy", CallingConvention = CallingConvention.Cdecl, SetLastError = false)]public static extern void MemCopy(ref byte dest, ref byte src, int count);//字節數組到整形數組的拷貝static void Main(string[] args){//測試----------------------------------------------var ms = new MemoryStream();BinaryWriter writer = new BinaryWriter(ms);writer.Write((byte)'a');writer.Write((byte)'b');writer.Write((byte)'c');writer.Write((byte)'d');writer.Write(10.2f);writer.Write((Int32)30); writer.Write((byte)'w');writer.Write((byte)'b');writer.Write((byte)'c');writer.Write((byte)'d');writer.Write((float)799);writer.Write((Int32)242);var len = ms.Length;int[] bs = new int[len/4];byte[] bss = new byte[len];byte[] buf = ms.GetBuffer();var ot = new ST();ST[] aot = new ST[2];Buffer.BlockCopy(buf, 0, bs, 0, (int)ms.Length);//Buffer.BlockCopy(buf, 0, aot, 0, (int)ms.Length);//錯誤，blockcopy只能用于基元數組MemCopy(bss, buf, (int)len);MemCopy(ref ot, buf, (int)len/2);//注意只有結構體能這么做,class不可以MemCopy(ref aot[0], buf, (int)len);byte[] sub = new byte[4];}}}

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posted on 2017-06-18 13:05 時空觀察者9號 閱讀(...) 評論(...) 編輯 收藏

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