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bytes和基本数据类型之间的转换

news 2025/12/6 23:54:31

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#include <QCoreApplication>
#include "CommonFun.h"
#include <QtEndian>
#include <QDebug>int main(int argc, char *argv[])
{QCoreApplication a(argc, argv);qDebug() << "bytes转quint16";{// 方式一：移位转换const QByteArray& byteBuf = QByteArray::fromHex("80f0");quint16 nVal = 0;FromBytesT(byteBuf.data(), nVal);qDebug() << nVal;}{// 方式二：QByteArray方法转换const QByteArray& byteBuf = QByteArray::fromHex("80f0");quint16 nVal = 0;nVal = byteBuf.toHex().toUShort(nullptr, 16);qDebug() << nVal;}{// 方式三：memcpy转换const QByteArray& byteBuf = QByteArray::fromHex("80f0");quint16 nVal = 0;memcpy(&nVal, byteBuf.data(), byteBuf.size()); // 此处会转成小端，因为x86为小端运行环境nVal = qToBigEndian(nVal); // 转成大端qDebug() << nVal;}{// 方式四：qFromBigEndian方法转换const QByteArray& byteBuf = QByteArray::fromHex("80f0");quint16 nVal = 0;qFromBigEndian<quint16>(byteBuf.data(), byteBuf.size(), &nVal);qDebug() << nVal;}//------------------------------------------------------------------------qDebug() << "quint16转bytes";{// 方式一：移位转换quint16 nVal = 33008;QByteArray byteBuf(8, '\0');ToBytesT(nVal, byteBuf.data(), 2, false);qDebug() << byteBuf.toHex(' ');}{// 方式二：QByteArray方法转换quint16 nVal = 33008;QByteArray byteBuf = QByteArray::fromHex(QByteArray::number(nVal, 16));qDebug() << byteBuf.toHex(' ');}{// 方式三：memcpy转换quint16 nVal = 33008;QByteArray byteBuf(sizeof(quint16), '\0');memcpy(byteBuf.data(), &nVal, sizeof(quint16));std::reverse(byteBuf.begin(), byteBuf.end());qDebug() << byteBuf.toHex(' ');}{// 方式四：qToBigEndian方法转换quint16 nVal = 33008;QByteArray byteBuf(sizeof(nVal), '\0');qToBigEndian<quint16>(nVal, byteBuf.data());qDebug() << byteBuf.toHex(' ');}//------------------------------------------------------------------------qDebug() << "QByteArray大小端转换";{QByteArray byteBuf = QByteArray::fromHex("80f0");std::reverse(byteBuf.begin(), byteBuf.end()); // 逆转qDebug() << byteBuf.toHex(' ');}qDebug() << "quint16大小端转换";{// 将给定的值转换为大端格式quint16 nLittleEndianVal = 0xf080;quint16 nValNew = qToBigEndian(nLittleEndianVal); // 当前为小端环境，会转成大端qDebug() << nValNew;}return a.exec();
}

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#ifndef COMMONFUN_H
#define COMMONFUN_H#include <type_traits>// 字节数据转基本类型
template <class T>
static void FromBytesT(const char* lpBuf, T& num, int startIndex = 0, bool bInputBigEndian = true)
{const char* lpBytes = lpBuf + startIndex;int size(sizeof(T));char byMask(0xFF);T temp(0);num = 0;if (bInputBigEndian){for (int i = 0; i < size; ++i){num <<= 8;unsigned char byteValue = lpBytes[i] & byMask;temp = (T)(byteValue);num |= temp;}}else{for (int i = size - 1; i >= 0; i--){num <<= 8;unsigned char byteValue = lpBytes[i] & byMask;temp = (T)(byteValue);num |= temp;}}
}template <class T>
static void ToBytesT(const T& num, char *lpBuf, int startIndex = 0, bool bOutputBigEndian = true)
{char* lpBytes = lpBuf + startIndex;size_t size(sizeof (T));if (bOutputBigEndian){for (size_t i = 0; i < size; ++i){lpBytes[i] = (char) (num >> (( (size - 1) - i ) * 8));}}else{for (size_t i = 0; i < size; ++i){lpBytes[i] = (char) (num >> (i * 8));}}}#endif // COMMONFUN_H

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