Question

怎么将int转换为qbytearray

Answer 1

1：QBitArray2QString :也可以转化为整型，

测试程序： 测试输出结果是否和移位结果相同；

[cpp]
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QBitArray x;
int bit;
bit = 10;
x.resize(32);

x.fill(false);
x.setBit(bit,true);
QBitArray b;
b = this->BitArrayInvert(x);
ui->textEdit->setPlainText(this->bitArray2String(b).toAscii());
qDebug() << (0x1 << bit) <<this->bitArray2String(b)<< __FILE__<<__LINE__;

[cpp] view plain copy
QBitArray x;
int bit;
bit = 10;
x.resize(32);

x.fill(false);
x.setBit(bit,true);
QBitArray b;
b = this->BitArrayInvert(x);
ui->textEdit->setPlainText(this->bitArray2String(b).toAscii());
qDebug() << (0x1 << bit) <<this->bitArray2String(b)<< __FILE__<<__LINE__;

倒置程序：

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QBitArray BitArray2String::BitArrayInvert(QBitArray array)
{
QBitArray temp;
temp.resize(array.size());
temp.fill(false);
for ( int i = 0; i < array.size(); ++i ) {
if ( array.testBit(i) ) {
temp.setBit(array.size()-1-i,true);
}
}
return temp;
}

[cpp] view plain copy
QBitArray BitArray2String::BitArrayInvert(QBitArray array)
{
QBitArray temp;
temp.resize(array.size());
temp.fill(false);
for ( int i = 0; i < array.size(); ++i ) {
if ( array.testBit(i) ) {
temp.setBit(array.size()-1-i,true);
}
}
return temp;
}

转化程序：

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QString BitArray2String::bitArray2String(QBitArray array)
{
uint value = 0;
for ( uint i = 0; i < array.size(); ++i ) {
value <<= 1;
value += (int)array.at(i);
}
qDebug() << value <<__FILE__<<__LINE__; //转化出的整形

QString str;
str.setNum(value, 10);
return str;
}

[cpp] view plain copy
QString BitArray2String::bitArray2String(QBitArray array)
{
uint value = 0;
for ( uint i = 0; i < array.size(); ++i ) {
value <<= 1;
value += (int)array.at(i);
}
qDebug() << value <<__FILE__<<__LINE__; //转化出的整形
QString str;
str.setNum(value, 10);
return str;
}

输出结果： 1024 “1024”

2：QByerArray 2 QString

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QByteArray z;
z.append(0x68).append(0x65).append(0x6c).append(0x6c).append(0x6f);

QString::fromAscii(z.data())；

//把QByteArray转化成QString,

[cpp] view plain copy
QByteArray z;
z.append(0x68).append(0x65).append(0x6c).append(0x6c).append(0x6f);

QString::fromAscii(z.data())；

//把QByteArray转化成QString,

输出结果：hello

3：QByteArray 转化为整型：这里是对位操作，用处很大

[cpp]
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头文件包含：
typedef unsigned long U32;
程序如下：
QByteArray z;
z.resize(1);
z[0] = 0x0f;

U32 U1_JZPL_set;
U1_JZPL_set = 0;
U1_JZPL_set |= ((U32) z.at(0)) ;
qDebug()<<"/nU1_JZPL_set" <<U1_JZPL_set;

[cpp] view plain copy
头文件包含：
typedef unsigned long U32;
程序如下：
QByteArray z;
z.resize(1);
z[0] = 0x0f;

U32 U1_JZPL_set;
U1_JZPL_set = 0;
U1_JZPL_set |= ((U32) z.at(0)) ;
qDebug()<<"/nU1_JZPL_set" <<U1_JZPL_set;

输出结果： 15

QByteArray
转int（） 直接转化

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int bytesToInt(QByteArray bytes) {
int addr = bytes[0] & 0x000000FF;
addr |= ((bytes[1] << 8) & 0x0000FF00);
addr |= ((bytes[2] << 16) & 0x00FF0000);
addr |= ((bytes[3] << 24) & 0xFF000000);
return addr;
}

[cpp] view plain copy
int bytesToInt(QByteArray bytes) {
int addr = bytes[0] & 0x000000FF;
addr |= ((bytes[1] << 8) & 0x0000FF00);
addr |= ((bytes[2] << 16) & 0x00FF0000);
addr |= ((bytes[3] << 24) & 0xFF000000);
return addr;
}

int转QByteArray

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QByteArray intToByte(int number)
{
QByteArray abyte0;
abyte0.resize(4);
abyte0[0] = (uchar) (0x000000ff & number);
abyte0[1] = (uchar) ((0x0000ff00 & number) >> 8);
abyte0[2] = (uchar) ((0x00ff0000 & number) >> 16);
abyte0[3] = (uchar) ((0xff000000 & number) >> 24);
return abyte0;
}

[cpp] view plain copy
QByteArray intToByte(int number)
{
QByteArray abyte0;
abyte0.resize(4);
abyte0[0] = (uchar) (0x000000ff & number);
abyte0[1] = (uchar) ((0x0000ff00 & number) >> 8);
abyte0[2] = (uchar) ((0x00ff0000 & number) >> 16);
abyte0[3] = (uchar) ((0xff000000 & number) >> 24);
return abyte0;
}

qDebug()
<< intToByte(252);

输出结果：FC