Question

我正在尝试将Delphi中的desencrypt函数移植到C＃中。在delphi中我使用函数Move来使用指针将数据导入内存，所以我尝试使用marshal.copy函数具有相同的结果，但有时我会得到一个访问冲突异常，有时候会出现空格。留下附加功能的代码。有任何想法吗？非常感谢！

    public string prDecode(string s)
    {
        byte[] ArrayMap = new byte[256] {0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  
                                         0, 0, 0, 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59,60,
                                         61, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2,  3, 4, 5, 6, 7, 8, 9, 10, 
                                         11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 
                                         0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 
                                         36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
                                         51, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; 
        int I;
        char[] ArrayS = s.ToCharArray(0, s.Length);
        string resultado = "";
        char[] ArrayR = resultado.ToCharArray(0, resultado.Length);
        switch (s.Length)
        {
            case 2: 
                I = ArrayMap[ArrayS[0]] + (ArrayMap[ArrayS[1]] << 6);
                ArrayR = new char[1];
                Marshal.Copy((IntPtr)I, ArrayR, 0, ArrayR.Length);

                break;
            case 3:
                I = ArrayMap[ArrayS[0]] + (ArrayMap[ArrayS[1]] << 6) + 
                    (ArrayMap[ArrayS[2]] << 12);
                ArrayR = new char[2];
                Marshal.Copy((IntPtr)I, ArrayR, 0, ArrayR.Length);
                break;

            case 4:
                I = ArrayMap[ArrayS[0]] + (ArrayMap[ArrayS[1]] << 6) + 
                    (ArrayMap[ArrayS[2]] << 12) + (ArrayMap[ArrayS[3]] << 18);
                ArrayR = new char[3];
                Marshal.Copy((IntPtr)I, ArrayR, 0, ArrayR.Length);
                break;
        }
        string clave = new string (ArrayR);
        return clave;

    }

Answer 1

我认为你要找的功能是Array.Copy或Buffer.BlockCopy而不是Marshal.Copy。 Marshal.Copy用于复制与非托管内存之间的数据。

Answer 2

除非您为遗留代码访问非托管内存，否则无需使用Marshal。托管代码不需要指针和使用托管方法会更快。

我认为您正在寻找的是使用托管代码在阵列之间复制的Array.Copy。

如何使用marshal.Copy函数将数据读入内存？

2 个答案: