C ++十六进制字符串到字节数组 [英] C++ hex string to byte array

问题描述

我想通过udp发送一个十六进制值字符串，

I'm trying to send a string of hex values through udp,

11 22 33 44 37 4D 58 33 38 4C 30 39 47 35 35 34 31 35 31 04 D7 52 FF 0F 03 43 2D AA

使用UdpClient

using UdpClient in C++.

将 string ^ 转换为数组的最佳方式是< Byte> ^ ？

推荐答案

这对我有用，虽然我没有测试错误 - 检测所有这一切。

This works for me, although I haven't tested the error-detection all that well.

ref class Blob
{
    static short* lut;
    static Blob()
    {
        lut = new short['f']();
        for( char c = 0; c < 10; c++ ) lut['0'+c] = 1+c;
        for( char c = 0; c < 6; c++ ) lut['a'+c] = lut['A'+c] = 11+c;
    }
public:
    static bool TryParse(System::String^ s, array<System::Byte>^% arr)
    {
        array<System::Byte>^ results = gcnew array<System::Byte>(s->Length/2);
        int index = 0;
        int accum = 0;
        bool accumReady = false;
        for each (System::Char c in s) {
            if (c == ' ') {
                if (accumReady) {
                    if (accum & ~0xFF) return false;
                    results[index++] = accum;
                    accum = 0;
                }
                accumReady = false;
                continue;
            }
            accum <<= 4;
            accum |= (c <= 'f')? lut[c]-1: -1;
            accumReady = true;
        }
        if (accumReady) {
            if (accum & ~0x00FF) return false;
            results[index++] = accum;
        }
        arr = gcnew array<System::Byte>(index);
        System::Array::Copy(results, arr, index);
        return true;
    }
};

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