可用于发送数据

#ifndef DATAWRITER

#define DATAWRITER

#include

class DataWriter

{

public:

static int writeInt(QByteArray& block, int offset, int value)

{

block[offset++] = (unsigned char)(value >> 24 & 0xff);

block[offset++] = (unsigned char)(value >> 16 & 0xff);

block[offset++] = (unsigned char)(value >> 8 & 0xff);

block[offset++] = (unsigned char)(value & 0xff);

return offset;

}

static int writeShort(QByteArray& block, int offset, short value)

{

block[offset++] = (unsigned char)(value >> 8 & 0xff);

block[offset++] = (unsigned char)(value & 0xff);

return offset;

}

static int writeFloat(QByteArray &block, int offset, float value)

{

int *dd = (int *)&value;

block[offset++] = (unsigned char)((*dd) & 0xff);

block[offset++] = (unsigned char)((*dd) >> 8 & 0xff);

block[offset++] = (unsigned char)((*dd) >> 16 & 0xff);

block[offset++] = (unsigned char)((*dd) >> 24 & 0xff);

return offset;

}

static int readInt(QByteArray data, int dpos)

{

int i1 = data[dpos++] & 0xff;

int i2 = data[dpos++] & 0xff;

int i3 = data[dpos++] & 0xff;

int i4 = data[dpos++] & 0xff;

int val1 = i4 + ((i3 & 0xff) << 8) + ((i2 & 0xff) << 16) + ((i1 & 0xff) << 24);

return val1;

}

static short readShort(QByteArray data, int dpos)

{

int i1 = data[dpos++] & 0xff;

int i2 = data[dpos++] & 0xff;

short val1 = i2 + ((i1 & 0xff) << 8);

return val1;

}

static int writeChar(QByteArray &dest, int offset, char value)

{

dest[offset++] = value;

return offset;

}

static int writeByteArray(QByteArray &dest, int offset, QByteArray source)

{

dest.append(source);

offset += source.size();

return offset;

}

static int writeString(QByteArray &data, int offset, QString t, int len)

{

QString text = t;

for (int i = 0; i < len; i++)

{

if (text.length() <= i)

{

data[offset++] = 0x20;

}

else

{

data[offset++] = text.at(i).toLatin1();

}

}

return offset;

}

static int writeChineseString(QByteArray &data, int offset, QString t, int len)

{

QByteArray baTmp;

baTmp = t.toUtf8();

for (int i = 0; i < len; i++)

{

if (baTmp.length() <= i)

{

data[offset++] = 0x20;

}

else

{

data[offset++] = baTmp.at(i);

}

}

return offset;

}

};

#endif // DATAWRITER