16进制字符串转QByteArray，char转16进制字符串

直接上代码，看代码你们就懂了

1、16进制QString转QByteArray

 QString str = "01 a5 1e 02";
 QByteArray tmpBy;
 StringToHex(str, tmpBy);

 void MainWindow::StringToHex(QString str, QByteArray &senddata)
 {
     int hexdata,lowhexdata;
     int hexdatalen = ;
     int len = str.length();
     senddata.resize(len/);
     char lstr,hstr;
     for(int i=; i<len; )
     {
         //char lstr,
         hstr=str[i].toLatin1();
         if(hstr == ' ')
         {
             i++;
             continue;
         }
         i++;
         if(i >= len)
             break;
         lstr = str[i].toLatin1();
         hexdata = ConvertHexChar(hstr);
         lowhexdata = ConvertHexChar(lstr);
         if((hexdata == ) || (lowhexdata == ))
             break;
         else
             hexdata = hexdata*+lowhexdata;
         i++;
         senddata[hexdatalen] = (char)hexdata;
         hexdatalen++;
     }
     senddata.resize(hexdatalen);
 }

 char MainWindow::ConvertHexChar(char ch)
 {
     if((ch >= '') && (ch <= ''))
         return ch-0x30;
     else if((ch >= 'A') && (ch <= 'F'))
         return ch-'A'+;
     else if((ch >= 'a') && (ch <= 'f'))
         return ch-'a'+;
     else return ch-ch;//不在0-f范围内的会发送成0
 }

2、qint8(signed char)转16进制字符串

     QDataStream out(&requestData,QIODevice::ReadWrite);    //将字节数组读入
     QString strReceive;
     int index = ;
     while(!out.atEnd())
     {
         qint8 outChar = ;
         out>>outChar;   //每字节填充一次，直到结束
         //十六进制的转换
         QString str = QString("%1").arg(outChar & 0xFF,,,QLatin1Char(''));
         strReceive.append(str);
     }

3、这块我主要是用在串口通信这里了，看自己实际情况吧