Qt、C++中，大小端变量类型转换

2024-06-15 1101阅读

#define isEndianTyped true //ture为大端；false为小端

Qt、C++中，大小端变量类型转换
（图片来源网络，侵删）

1、quint32转QbyteArray

QByteArray byteToBytes::quint32ToQByteArray(quint32 input)
{
	QByteArray output;
	if (isEndianTyped)
	{
		output[3] = (uchar)(0x000000ff & input);
		output[2] = (uchar)((0x0000ff00 & input) >> 8);
		output[1] = (uchar)((0x00ff0000 & input) >> 16);
		output[0] = (uchar)((0xff000000 & input) >> 24);
	}
	else
	{
		output[0] = (uchar)(0x000000ff & input);
		output[1] = (uchar)((0x0000ff00 & input) >> 8);
		output[2] = (uchar)((0x00ff0000 & input) >> 16);
		output[3] = (uchar)((0xff000000 & input) >> 24);
	}
	return output;
}

2、QbyteArray 转quint32

quint32 byteToBytes::QByteArrayToquint32(QByteArray input)
{
	qint64 output;
	if (isEndianTyped)
	{
		output = input[3] & 0x000000FF;
		output |= (input[2]  24);
	}
	else
	{
		output[0] = (uchar)(0x000000ff & input);
		output[1] = (uchar)((0x0000ff00 & input) >> 8);
		output[2] = (uchar)((0x00ff0000 & input) >> 16);
		output[3] = (uchar)((0xff000000 & input) >> 24);
	}
	return output;
}

4、QbyteArray转qint32

qint32 byteToBytes::QByteArrayToqint32(QByteArray input)
{
	qint64 output;
	if (isEndianTyped)
	{
		output = input[3] & 0x000000FF;
		output |= (input[2]  8);
	}
	return output;
}

8、QbyteArray转qint16

qint16 byteToBytes::QByteArrayToqint16(QByteArray input)
{
	qint64 output;
	if (isEndianTyped)
	{
		output = input[3] & 0x000000FF;
		output |= (input[2]  8);
		output[2] = (uchar)((0x00ff0000 & input) >> 16);
		output[3] = (uchar)((0xff000000 & input) >> 24);
	}
	return output;
}

15、QbyteArray转uint

uint byteToBytes::QByteArrayTouint(QByteArray input)
{
	uint output;
	if (isEndianTyped)
	{
		output = input[3] & 0x000000FF;
		output |= (input[2]  24);
	}
	else
	{
		output[0] = (uchar)(0x000000ff & input);
		output[1] = (uchar)((0x0000ff00 & input) >> 8);
		output[2] = (uchar)((0x00ff0000 & input) >> 16);
		output[3] = (uchar)((0xff000000 & input) >> 24);
	}
	return output;
}

17、QbyteArray转short

short byteToBytes::QByteArrayToshort(QByteArray input)
{
	qint64 output;
	if (isEndianTyped)
	{
		output = input[3] & 0x000000FF;
		output |= (input[2]  8);
	}
	else
	{
		output[0] = (uchar)(0x000000ff & input);
		output[1] = (uchar)((0x0000ff00 & input) >> 8);
	}
	return output;
}

19、QbyteArray转ushort

ushort byteToBytes::QByteArrayToushort(QByteArray input)
{
	qint64 output;
	if (isEndianTyped)
	{
		output = input[3] & 0x000000FF;
		output |= (input[2]  8);
	}
	else
	{
		output[0] = (uchar)(0x000000ff & input);
		output[1] = (uchar)((0x0000ff00 & input) >> 8);
	}
	return output;
}

21、QbyteArray转float

float byteToBytes::QByteArrayTofloat(QByteArray input)
{
	float output;
	if (isEndianTyped)
	{
		QByteArray _input;
		for (int i = 0; i  

22、float转QbyteArray
 

QByteArray byteToBytes::floatToQByteArray(float input)
{
	QByteArray output;
	if (isEndianTyped)
	{
		QByteArray _output;
		_output.resize(sizeof(input));
		memcpy(_output.data(), &input, sizeof(input));
		for (int i = 0; i  

23、QbyteArray转double
 

double byteToBytes::QByteArrayTodouble(QByteArray input)
{
	double output;
	if (isEndianTyped)
	{
		QByteArray _input;
		for (int i = 0; i  

24、double转QbyteArray
 

QByteArray byteToBytes::doubleToQByteArray(double input)
{
	QByteArray output;
	if (isEndianTyped)
	{
		QByteArray _output;
		_output.resize(sizeof(input));
		memcpy(_output.data(), &input, sizeof(input));
		for (int i = 0; i  

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