IEEE754 浮点数和Hex转换

￡神魔★判官ぃ 2022-12-03 13:27 282阅读 0赞

static quint32 toUint(const QByteArray &data, bool bigEndian)
    {
    	if (data.size() != 4)
    		return 0;
    
    	quint32 word = 0;
    
    	if (bigEndian) {
    		word = quint32((quint8(data.at(0)) << 24) |
    					   (quint8(data.at(1)) << 16) |
    					   (quint8(data.at(2)) <<  8) |
    					   (quint8(data.at(3)) <<  0));
    	} else {
    		word = quint32((quint8(data.at(0)) <<  0) |
    					   (quint8(data.at(1)) <<  8) |
    					   (quint8(data.at(2)) << 16) |
    					   (quint8(data.at(3)) << 24));
    
    	}
    	return word;
    }
    
    static float toFloat(const QString &data, bool bigEndian)
    {
    	const QByteArray ba = QByteArray::fromHex(data.toLatin1());
    	quint32 word = toUint(ba, bigEndian);
    
    	const float *f = reinterpret_cast<const float *>(&word);
    
    	return *f;
    }
    
    static QString toHex(quint32 value, bool bigEndian)
    {
    	QByteArray ba;
    	if (bigEndian) {
    		ba.append(char(value >> 24));
    		ba.append(char(value >> 16));
    		ba.append(char(value >>  8));
    		ba.append(char(value >>  0));
    	} else {
    		ba.append(char(value >>  0));
    		ba.append(char(value >>  8));
    		ba.append(char(value >> 16));
    		ba.append(char(value >> 24));
    	}
    	return ba.toHex().toUpper();
    }
    
    static QString toHex(float value, bool bigEndian)
    {
    	const quint32 *i = reinterpret_cast<const quint32 *>(&value);
    
    	return toHex(*i, bigEndian);
    }
    
    void on_hexEdited()
    {
    	const bool bigEndian = ui->bigEndian->isChecked();
    
    	float f = toFloat(ui->hexLineEdit->text(), bigEndian);
    	ui->floatLineEdit->setText(QString::number(double(f)));
    }
    
    void on_floatEdited()
    {
    	const bool bigEndian = ui->bigEndian->isChecked();
    	const float f = ui->floatLineEdit->text().toFloat();
    
    	ui->hexLineEdit->setText(toHex(f, bigEndian));
    }
    
    void on_bigEndiantoggled()
    {
    	on_floatLineEdit_textEdited();
    }