แปลงข้อมูล ใน Qt

     //แปลงเป็นฐานอะไรก็ได้ 
     int x = 15;
     QString xAsHex = QString("%1").arg(x, 0, 16);
     qDebug() << "x = " << x << " = " << xAsHex;

// QString to int  

   QString num="123";
   int n = num.toInt();
 

 //Int to QString
   int num2 = 123;

   QString str= QString::number(num2);

>> http://www.qtforum.org/article/33749/convert-string-to-int-and-int-to-string.html

----------------------------------------------------------------------------------------

   //qtstring to int 

   QString Abcd = "45";

   int b = Abcd.split(" ")[0].toInt();//convert the first part to Int

  Abcd.split(" ")[0].toDouble();//convert the first part to double

  Abcd.split(" ")[0].toFloat();//convert the first part to double
 

  qDebug() << b+50;

>> : http://stackoverflow.com/questions/16633555/how-to-convert-qtstring-to-int

---------------------------------------------------------------------------------------      //string to const char * (serial.write)

 QString callA = ui->lineEdit_call_number->text(); 
 QString callB = "ATD"+callA+";"; 
 const char* callC = callB.toLatin1().data(); serial->write(callC);

-------------------------------------------------------------------------------------------

//การใช้ Qbyte Array

   QByteArray A;
   A[0] = 0x1A;
  serial->write(A);

------------------------------------------------------------------------------------------

   


//-------- int to binary
int data = ui->lineEdit_InttoBinary->text().toInt();

    QString myStringOfBits( QString::number( data, 2 ) );

    ui->lineEdit_InttoBinary2->setText(myStringOfBits);

-------------------------------------------------------------------------------------

//--- int to hex 2 byte




     int data  = ui->lineEdit_Inttohex1->text().toInt();
     QString data2 = QString::number(data, 16);
     if(data2.size()<4)
     {
       data2 = QString(4-data2.size(), '0')+data2;
      }
      ui->lineEdit_Inttohex2->setText(data2);


------------------------------------------------------------------------------------

//---- ASCII hex to int   
 QString data = ui->lineEdit_hextoint1->text();




    bool bStatus = false;




    uint nHex = data.toUInt(&bStatus,16);









    QString data2 = QString::number(nHex);




    ui->lineEdit_hextoint2->setText(data2);



-----------------------------------------------------------------------------------



// String to hex
static inline QString embracedString( const QString & s )
{
    return s.section( '(', 1 ).section( ')', 0, 0 );
}



// String to ByteArray เพื่อจะแยกข้อมูลทีละตัว 
 QString data2 ="01f4";

 QByteArray a2 = data2.toUtf8();

 qDebug() << "a2[0]" << a2[0];
 qDebug() << "a2[1]" << a2[1];
 qDebug() << "a2[2]" << a2[2];
 qDebug() << "a2[3]" << a2[3];



//------ Byte Array to Int





   QByteArray x;

   x.resize(2);

   x[0] = 0x01;

   x[1] = 0x2A;

   

   int num = 0;

   num |= x[0];

   num << 8;

   num |= x[1];

   num << 8;

   qDebug() << "num = " << num;

// Random  

#include <QGlobal.h>
#include <QTime>

int QMyClass::randInt(int low, int high)
{
// Random number between low and high
return qrand() % ((high + 1) - low) + low;
}

// Create seed for the random
// That is needed only once on application startup
QTime time = QTime::currentTime();
qsrand((uint)time.msec());

// Get random value between 0-100
int randomValue = randInt(0,100);

>> http://eastfist.com/qt_tutorials/how-to-generate-random-number-in-qt


//---- Name User Test ------------------------------------------



     ui->combobox_NameUserTest->addItem("สิทธิกร สุดหล่อ");



     ui->combobox_NameUserTest->addItem("มานี ใจดี");



     ui->combobox_NameUserTest->currentIndex();







//---- Date ---------------------------------------------------



     QDate     date = QDate::currentDate();



     QString  date2 = date.toString("dd/MM/yyyy");



     ui->lineEdit_DateJob->setText(date2);



//---- Time ---------------------------------------------------



      QTime time = QTime::currentTime();



      QString time2 = time.toString("hh:mm:ss");



      ui->lineEdit_TimeJob->setText(time2);








//--------- hex to int 



    bool       ok;


    QString data = ui->lineEdit_test2->text();


    int data2 = data.toUInt(&ok,16);


    qDebug()<< "data2 = " << data2;





//------------- int to string และ ส่งข้อมูลผ่าน serial เป็น cont char

void Dialog::on_blue_slider_valueChanged(int value)
{
  ui->blue_value_label->setText(QString("<span style=\" font-size:18pt; font-weight:600;\">%1</span>").arg(value));
  Dialog::updateRGB(QString("b%1").arg(value));
  qDebug() << value;
}


void Dialog::updateRGB(QString command)
{
  if (arduino->isWritable())
  {
    arduino->write(command.toStdString().c_str());
  } 
  else 
  {
    qDebug() << "Couldn't write to serial!";
  }
}




------------------------------
สรุปสั้นๆ string to cons char*  ส่งผ่าน serial


      QString datas = "[{\"id\":1,\"status\":1,\"r\":255,\"g\":0,\"b\":0}]";
      arduino->write(datas.toStdString().c_str());



-----------------------------------




QString แสดงตัวเลขฐานสิบหก เอามาแยกทีละตัว แล้วแปลงเป็น Int 


void MainWindow::on_pushButton_clicked()

{

ui->logstext->insertPlainText("0103BE000100020003000400050006000700080009000a000b000c0001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100010001000100000001000100010001000100010001000159E3");

QString data = ui->logstext->toPlainText(); qDebug() << "data = " << data;

 QString str[2400] ;

 for(int i=0; i<data.length();i++)

{

str[i] = data.at(i);

qDebug() << "str "  << i << " = " << str[i];

 }

QString str2[2400];

     for(int i=8; i<60 ;i+=4)

     {

str2[i] = str[i]+str[i+1];

         qDebug() << "str2 "  << i << " = " << str2[i];

     }

     int str3[400];

     for(int i=8; i<60 ;i+=4)

     {

         str3[i] = strHexotInt(str2[i]);

         qDebug() << "str3 "  << i << " = " << str3[i];

     }

}

int MainWindow::strHexotInt(QString data)

{

bool ok;

    int a = data.toInt(&ok,16); //qDebug() << "a =" <<a;

 ui->logstext_2->clear();

    ui->logstext_2->insertPlainText(QString::number(a));

return a;

}



-------------------------------------------------------------



String to ByeArray  and ByteAraay to String

    QString a = "test";

    QByteArray a1 = a.toUtf8();

    QString backToString = a1;


ถ้าเอาง่ายๆ อ่านข้อมูลมาจาก serial ที่เป็น ByteArray
โดยยกตัวอย่าง คือ ByteAraay data;
         QString s_data = data;
         qDebug() << "  BiG = " << s_data;

หรือ ByteAraay data = "123456";
         QString s_data = data;
คำตอบคือ 123456
















-----------------------------
    QString hex;

    //Convert the to a hex string
    int nFirst = List.at(4).toUInt();
    int nSecond = List.at(5).toUInt();
    hex.append(QString("%1").arg(QString().setNum(nFirst,16),2,'0'));
    hex.append(QString("%1").arg(QString().setNum(nSecond,16),2,'0'));

    //convert the hex string into the port
    bool ok;
    mPort = hex.toUInt(&ok,16);

------------------------String to float----------------
       String line = 1.23456;
        bool ok = true; 
        float line_float = line.toFloat(&ok);  

------------------------float to string cat define decimal----------------
ui->label_light->setText(QString::number(line_float,'f',1));