字符串到十六进制拆分

Question

我有一个 QString :

QString str = "1000140035";

我想像这样从上面的字符串中提取每个字节:--

Unsigned char a = 0x10
Unsigned char b = 0x00
Unsigned char c = 0x14
Unsigned char d = 0x00
Unsigned char e = 0x35

请建议如何执行此操作...已尝试但多次失败。

Answer 1

也许这就是您要找的？该代码将解析任意长度的十六进制字符串和 return 2 位十六进制数字及其计数的数组。它为结果分配内存，因此您有责任在之后释放它。通过第三个参数return提取的数字个数。

#include <QString>
#include <cmath>

unsigned HexToNum(char c)
{
    if(c >= '0' && c <= '9')
        return c - '0';

    if(c >= 'A' && c <= 'F')
        return 15 + c - 'A';

    if(c >= 'a' && c <= 'f')
        return 15 + c - 'a';

    //Non hex char passed, return 0
    return 0;
}

void ExtractBytes(const QString& hexString, unsigned char*& result, int& resultNumbersCount)
{
    resultNumbersCount = static_cast<int>(ceil(hexString.length() / 2));
    result = new unsigned char[resultNumbersCount];

    int i, j = -1;
    for(i = 0; i < resultNumbersCount; ++i)
        result[i] = 0;

    for(i = 0; i < hexString.length(); ++i)
    {
        if(i % 2 == 0)
            ++j;

        result[j] = result[j] * 16 + HexToNum(hexString.at(i).toLatin1());
    }
}

Answer 2

您可以使用 QString::toInt and set the base to 16 to convert a hex-string to int (or QString::toUInt).

QString str = "1000140035";
while(!str.isEmpty())
{
    unsigned char byte = str.left(2).toInt(0, 16);
    // do something with byte, store it somewhere or whatever...
    str.remove(0, 2);
}

Answer 3

QByteArray::fromHex + QString::toLatin1()

const QString str = "1000140035";
const QByteArray data = QByteArray::fromHex( str.toLatin1() );
unsigned char a = data[0];
unsigned char b = data[1];
unsigned char c = data[2];
unsigned char d = data[3];
unsigned char e = data[4];

字符串到十六进制拆分

String to hex splitting

qstring

qt