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  4. how to read hex value data from text file and store into array?
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how to read hex value data from text file and store into array?

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  • jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #10

    Read the file content in a QByteArray using QFile::readAll().
    Then call split(',') on that byte array.
    You will get a list of QByteArray like:

    ["0x09","0xFF","0xD5","0x3C","0x06","0x7C","0x0A"...]
    

    Now you can loop over all the elements of the list and call QByteArray::fromHex(...).toInt() to convert from hex to integer.

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    JohanSoloJ 1 Reply Last reply
    1
    • jsulmJ jsulm

      Read the file content in a QByteArray using QFile::readAll().
      Then call split(',') on that byte array.
      You will get a list of QByteArray like:

      ["0x09","0xFF","0xD5","0x3C","0x06","0x7C","0x0A"...]
      

      Now you can loop over all the elements of the list and call QByteArray::fromHex(...).toInt() to convert from hex to integer.

      JohanSoloJ Offline
      JohanSoloJ Offline
      JohanSolo
      wrote on last edited by
      #11

      @jsulm said:

      Read the file content in a QByteArray using QFile::readAll().
      Then call split(',') on that byte array.

      Nice idea, no need for regular expressions indeed!

      `They did not know it was impossible, so they did it.'
      -- Mark Twain

      1 Reply Last reply
      0
      • S Offline
        S Offline
        sachin786
        wrote on last edited by sachin786
        #12

        ok for now i done till this.
        my file is 1.txt, which contains simply this "1A,2C,0A"

        unsigned char temp[3]={0}
        QByteArray bb("0x");
        QByteArray aa;

        QString line;
        QFile file1(filename);
        if(file1.open(QIODevice::ReadOnly | QIODevice::Text)){
        line=file1.readAll();
        QStringList strings2 = line.split(QRegExp("\W+"), QString::SkipEmptyParts);
        int n = strings2.size();

            for(x=0;x<n;x++){
                   qDebug() << strings2.at(x) << "  ";
                   aa = strings2.at(x).toLocal8Bit();      // at this aa =1A first loop, and so on.
                   bb=bb.append(aa);    // bb= 0x1A for first loop , and so on
                   bb ="0x";                     // initialise 'bb'
                   /*
                    *
                    * in this portion is there any way  i can save value of 'bb' to my unsigned    char  temp[ ]?
                    *so that i can do something like temp[x]=bb ?? 
                    */
        
                   if(x==n) break;
                  }               
             }
        
        1 Reply Last reply
        0
        • jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by jsulm
          #13

          It is not really clear what you want: do you want to store a character represented by the hex value or the integer value?
          So, how should temp look after you store bb there?
          What is this supposed to do?

          bb=bb.append(aa);    // bb= 0x1A for first loop , and so on
          bb ="0x";
          

          you first assign a value and then overwrite it with "0x".
          Why do you need 0x?

          In my previous post I already suggested how to convert hex string to integer.

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          1 Reply Last reply
          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #14

            From your latest text sample, what about:

            QByteArray dataFromFile = file.readAll();
            QByteArray aa = "0x" +  dataFromFile.replace(",", "");
            

            But as @jsulm asked, what is your final goal with these data ?

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            1 Reply Last reply
            0
            • S Offline
              S Offline
              sachin786
              wrote on last edited by sachin786
              #15
              1. I have a file with hex values saved as hex.txt which has
                0x04,0x2C,0x64,0x00,0xB6,0x03,0xFA,0x84,0x87,0x6A,0x74,0x18,0x01,0x64,0x79,0x13,0x09,0x6A,0xCB,0xED,0x3D,0x9C,0x79,0x88,0x49,0x4A,0x2E,0xE8,0x89,0x24,0xF7,0xDD,0x04,0xA9,0x09,0xE7,0xE5,0x14,0xF7,0x5B,0xC5,0x49,0x38,0x10,0xFA,0x5C,0xFA,0x99,0xC4,0x0D,0x74,0xE0,0x3A,0x45,0xE8,0x64,0xCC,0xBB,0x72,0x57,0x31,0x63,0xF9,0x7F,0x46,0x48,0xF4,0xE8,0x91,0x5B,0xF8,0xED,0x07,0x9B,0x09,0x07,0x0D,0x64,0xF7,0x64,0xC7,0x5A,0xB8,0x17,0xCD,0xBC,0x6A,0xA9,0xC3,0x9D,0xEF,0x96,0x9D,0x62,0xF5,0xDD,0x83,0xD9,0x45,0x0F,0x99,0x4B,0xF6,0x63,0x41,0x29,0x38,0xE0,0x4A,0xCD,0xF9,0x94,0xC3,0x1D,0xAE,0xB8,0x96,0x3D,0x69,0x82,0x8C,0xFF,0x29,0xF9,0x2A,0xF6,0x85,0x50,0x45,0x1A,0x7E,0xF8,0x26,0x66,0x86,0x43,0x48,0x4B,0x3E,0xF9,0x96,0xD4,0x6A,0x33,0xC3,0x6B,0x75,0xFD,0x29,0x95,0xAA,0x27,0xC4,0xBD,0xF7,0x0F,0x99,0x1D,0xEB,0x9C,0x84,0xFB,0x7B,0xF8,0x4D,0x3A,0xFA,0x12,0x43,0xC9,0x43,0x0F,0x66,0x52,0xF7,0x6F,0x87,0x4A,0x36,0xE9,0xD5,0x84,0x8B,0x9A,0x8B,0xFF,0xC1,0x0F,0x2D,0x25,0x8B,0x99,0xCE,0xFE,0xC3,0xFF,0x0E,0xC9,0xF8,0x88,0x83,0xD9,0x83,0xD8,0x5D,0x91,0xF5,0x76,0xC7,0x3A,0xF8,0xE0,0x86,0x71,0xF7,0x7C,0x04,0x3A,0xFA,0xD8,0x95,0x69,0x4B,0x8F,0xC5,0xFA,0xFB,0xEF,0xBD,0x19,0xF6,0x05,0xC6,0xB8,0x7B,0x16,0xD5,0x71,0xF6,0x7D,0x46,0xD7,0xB7,0xC0,0xE5,0x11,0xF7,0x75,0x04,0x4A,0x3A,0xE1,0x72,0xD9,0x4B,0x96,0x89,0xFF,0xFF,0xDF,0x82,0xF2,0xF4,0x65,0x44,0x3B,0xB8,0xF0,0xF9,0xF9,0x43,0x50,0xC4,0x9D,0xFE,0x37,0x62,0xB8,0xA7,0x88,0x43,0xE9,0xC1,0xEF,0xB5,0x50,0xF7,0x87,0x85,0x17,0x40,0xE8,0x01,0x98,0x4A,0x86,0xC7,0xF7,0xFF,0x0F,0x31,0x38,0x4A,0x0B,0x44,0x38,0x7E,0xF8,0x59,0xE8,0x49,0x8B,0xC3,0xD9,0xFF,0xEF,0x72,0xE0,0x4A,0x0C,0xC7,0x29,0x3E,0xF8,0x45,0x33,0x7C,0x1B,0x02,0xDA,0x3F,0xF8,0xB1,0xF8,0x45,0x80,0x44,0x19,0xBE,0xE0,0xD6,0xC8,0x45,0x04,0xC3,0xF9,0x05,0x1F,0xA1,0x6B,0x7C,0x94,0xC3,0xF7,0xFB,0x0F,0xA3,0x2F,0x3F,0x11,0x27,0x42,0xF7,0x44,0x1F,0x65,0x62,0x52,0x42,0x4A,0x34,0x22,0x13,0x21,0x54,0x18,0x22,0x85,0xFF,0x43,0x32,0xB8,0xA5,0xF7,0xFF,0x12,0xF2,0x1F,0xC1,0x68,0x48,0x86,0x2F,0x22,0xF8,0x26,0x23,0xFF,0x0F,0xF6,0xFF,0x3F,0x77,0x45,0x1F,0x1F,0x17,0xF4,0x74,0x34,0x36,0x73,0x3F,0x26,0xF2,0x1F,0x6F,0x92,0x41,0xF7,0xFF,0x77,0xA6,0xF4,0x8F,0x4F,0xF4,0xF9,0x33,0x75,0x32,0xF4,0xF1,0xF8,0xF1,0x1F,0x8F,0x46,0x36,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xA2,0xE4
                total is 498 bytes

              2)Now I need to copy this 498 bytes values (same to same) to below array at a particular position starting from [8] to [498]

              given the array in that array i want to store above text file data.....
              unsigned char hex[508]={
              0x5A,0xA5,0x0B,0x01,0xF4,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
              0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

              kshegunovK 1 Reply Last reply
              0
              • jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #16
                temp[x]=static_cast<unsigned char>(QByteArray::fromHex(bb).toInt());
                

                https://forum.qt.io/topic/113070/qt-code-of-conduct

                1 Reply Last reply
                0
                • S sachin786
                  1. I have a file with hex values saved as hex.txt which has
                    0x04,0x2C,0x64,0x00,0xB6,0x03,0xFA,0x84,0x87,0x6A,0x74,0x18,0x01,0x64,0x79,0x13,0x09,0x6A,0xCB,0xED,0x3D,0x9C,0x79,0x88,0x49,0x4A,0x2E,0xE8,0x89,0x24,0xF7,0xDD,0x04,0xA9,0x09,0xE7,0xE5,0x14,0xF7,0x5B,0xC5,0x49,0x38,0x10,0xFA,0x5C,0xFA,0x99,0xC4,0x0D,0x74,0xE0,0x3A,0x45,0xE8,0x64,0xCC,0xBB,0x72,0x57,0x31,0x63,0xF9,0x7F,0x46,0x48,0xF4,0xE8,0x91,0x5B,0xF8,0xED,0x07,0x9B,0x09,0x07,0x0D,0x64,0xF7,0x64,0xC7,0x5A,0xB8,0x17,0xCD,0xBC,0x6A,0xA9,0xC3,0x9D,0xEF,0x96,0x9D,0x62,0xF5,0xDD,0x83,0xD9,0x45,0x0F,0x99,0x4B,0xF6,0x63,0x41,0x29,0x38,0xE0,0x4A,0xCD,0xF9,0x94,0xC3,0x1D,0xAE,0xB8,0x96,0x3D,0x69,0x82,0x8C,0xFF,0x29,0xF9,0x2A,0xF6,0x85,0x50,0x45,0x1A,0x7E,0xF8,0x26,0x66,0x86,0x43,0x48,0x4B,0x3E,0xF9,0x96,0xD4,0x6A,0x33,0xC3,0x6B,0x75,0xFD,0x29,0x95,0xAA,0x27,0xC4,0xBD,0xF7,0x0F,0x99,0x1D,0xEB,0x9C,0x84,0xFB,0x7B,0xF8,0x4D,0x3A,0xFA,0x12,0x43,0xC9,0x43,0x0F,0x66,0x52,0xF7,0x6F,0x87,0x4A,0x36,0xE9,0xD5,0x84,0x8B,0x9A,0x8B,0xFF,0xC1,0x0F,0x2D,0x25,0x8B,0x99,0xCE,0xFE,0xC3,0xFF,0x0E,0xC9,0xF8,0x88,0x83,0xD9,0x83,0xD8,0x5D,0x91,0xF5,0x76,0xC7,0x3A,0xF8,0xE0,0x86,0x71,0xF7,0x7C,0x04,0x3A,0xFA,0xD8,0x95,0x69,0x4B,0x8F,0xC5,0xFA,0xFB,0xEF,0xBD,0x19,0xF6,0x05,0xC6,0xB8,0x7B,0x16,0xD5,0x71,0xF6,0x7D,0x46,0xD7,0xB7,0xC0,0xE5,0x11,0xF7,0x75,0x04,0x4A,0x3A,0xE1,0x72,0xD9,0x4B,0x96,0x89,0xFF,0xFF,0xDF,0x82,0xF2,0xF4,0x65,0x44,0x3B,0xB8,0xF0,0xF9,0xF9,0x43,0x50,0xC4,0x9D,0xFE,0x37,0x62,0xB8,0xA7,0x88,0x43,0xE9,0xC1,0xEF,0xB5,0x50,0xF7,0x87,0x85,0x17,0x40,0xE8,0x01,0x98,0x4A,0x86,0xC7,0xF7,0xFF,0x0F,0x31,0x38,0x4A,0x0B,0x44,0x38,0x7E,0xF8,0x59,0xE8,0x49,0x8B,0xC3,0xD9,0xFF,0xEF,0x72,0xE0,0x4A,0x0C,0xC7,0x29,0x3E,0xF8,0x45,0x33,0x7C,0x1B,0x02,0xDA,0x3F,0xF8,0xB1,0xF8,0x45,0x80,0x44,0x19,0xBE,0xE0,0xD6,0xC8,0x45,0x04,0xC3,0xF9,0x05,0x1F,0xA1,0x6B,0x7C,0x94,0xC3,0xF7,0xFB,0x0F,0xA3,0x2F,0x3F,0x11,0x27,0x42,0xF7,0x44,0x1F,0x65,0x62,0x52,0x42,0x4A,0x34,0x22,0x13,0x21,0x54,0x18,0x22,0x85,0xFF,0x43,0x32,0xB8,0xA5,0xF7,0xFF,0x12,0xF2,0x1F,0xC1,0x68,0x48,0x86,0x2F,0x22,0xF8,0x26,0x23,0xFF,0x0F,0xF6,0xFF,0x3F,0x77,0x45,0x1F,0x1F,0x17,0xF4,0x74,0x34,0x36,0x73,0x3F,0x26,0xF2,0x1F,0x6F,0x92,0x41,0xF7,0xFF,0x77,0xA6,0xF4,0x8F,0x4F,0xF4,0xF9,0x33,0x75,0x32,0xF4,0xF1,0xF8,0xF1,0x1F,0x8F,0x46,0x36,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xA2,0xE4
                    total is 498 bytes

                  2)Now I need to copy this 498 bytes values (same to same) to below array at a particular position starting from [8] to [498]

                  given the array in that array i want to store above text file data.....
                  unsigned char hex[508]={
                  0x5A,0xA5,0x0B,0x01,0xF4,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
                  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

                  kshegunovK Offline
                  kshegunovK Offline
                  kshegunov
                  Moderators
                  wrote on last edited by kshegunov
                  #17

                  @sachin786
                  Judging from your C code you don't have a text file at all but rather a binary file where the characters are saved. Assuming this is the case you read the data into a byte array (as already suggested) and just copy the relevant parts into a new byte array.

                  QFile inputFile("myFileName.txt", QFile::ReadOnly);
                  if (!inputFile.open())
                      ; //< Handle open errors here
                  
                  QByteArray binary = inputFile.readAll();   //< binary contains the file now
                  
                  unsigned char hex[508]; //< This is your array
                  
                  qint32 start = 4, size = 498;
                  ::memcpy(hex + start, binary.constData(), size); //< Copy the binary data
                  

                  If, on the other hand, you indeed have a text file as shown in the above post, then you read the text into a string (as already suggested yet again) and split by the comma separator. You then convert the resulting strings into one byte integers and copy them over to the new byte array.

                  QFile inputFile("myFileName.txt", QFile::ReadOnly | QFile::Text);
                  if (!inputFile.open())
                      ; //< Handle open errors here
                  
                  QTextStream in(&inputFile);
                  QString text = in.readAll();   //< text contains the file now
                  
                  QStringList bytes = text.split(',');  //< Split the text into bytes
                  
                  QByteArray binary; //< Prepare the byte array
                  binary.reserve(bytes.size());
                  
                  bool ok = true;
                  foreach (QString byte, bytes)  {
                      unsigned char hexChar = byte.toInt(&ok, 0); //< Convert string to integer according to C-style rules
                      if (!ok)
                          ; //< Error while converting, handle accordingly
                  
                      binary.append(hexChar); //< Append the char to the byte array
                  }
                  
                  // And finally, copy the data:
                  
                  unsigned char hex[508]; //< This is your array
                  
                  qint32 start = 4, size = 498;
                  ::memcpy(hex + start, binary.constData(), size); //< Copy the binary data
                  

                  EDIT: Alternatively the last snippet could be modified so you can save the data directly while converting:

                  QFile inputFile("myFileName.txt", QFile::ReadOnly | QFile::Text);
                  if (!inputFile.open())
                      ; //< Handle open errors here
                  
                  QTextStream in(&inputFile);
                  QString text = in.readAll();   //< text contains the file now
                  
                  QStringList bytes = text.split(',');  //< Split the text into bytes
                  
                  bool ok = true;
                  
                  qint32 start = 4, size = 498;
                  for (qint32 i = 0, bytesNumber = bytes.size(), offset = start; i < bytesNumber && i < size; i++, offset++)  {
                      unsigned char hexChar = byte.toInt(&ok, 0); //< Convert string to integer according to C-style rules
                      if (!ok)
                          ; //< Error while converting, handle accordingly
                  
                      hex[offset] = hexChar;
                  }
                  

                  Read and abide by the Qt Code of Conduct

                  1 Reply Last reply
                  1
                  • S Offline
                    S Offline
                    sachin786
                    wrote on last edited by
                    #18

                    @kshegunov thanks for reply...
                    #include "qtquick1applicationviewer.h"
                    #include <QApplication>
                    #include <QtCore>
                    #include <QDebug>
                    int main(int argc, char *argv[])
                    {
                    QApplication app(argc, argv);

                    QtQuick1ApplicationViewer viewer;
                    viewer.addImportPath(QLatin1String("modules"));
                    viewer.setOrientation(QtQuick1ApplicationViewer::ScreenOrientationAuto);
                    viewer.setMainQmlFile(QLatin1String("qrc:/main.qml"));
                    viewer.showExpanded();
                    
                    
                    bool ok = true;
                    QString filename="/home/anas/myQtApp/sachin2hex/hex.txt";
                    QFile inputFile(filename);
                    QByteArray binary; //< Prepare the byte array
                    QStringList bytes;
                    int i=0;
                    
                    unsigned char hex[508]={0x5A,0xA5,0x0B,0x01,0xF4,0x01,0x00,0x00,....position from[4] to [498] bytes data ///  << same as mention above
                    
                    if(inputFile.open(QIODevice::ReadOnly | QIODevice::Text)){
                        QTextStream in(&inputFile);
                        QString text = in.readAll();   //< text contains the file now
                    
                        bytes = text.split(',');
                        qDebug() << "bytes :: " << bytes;
                    
                        binary.reserve(bytes.size());
                    
                        foreach (QString byte, bytes)  {
                            unsigned char hexChar = byte.toInt(&ok, 0); //< Convert string to integer according to C-style rules
                            if (!ok)
                                ; //< Error while converting, handle accordingly
                    
                            binary.append(hexChar); //< Append the char to the byte array
                        }
                    
                        qint32 start = 4, size = 498;
                        ::memcpy(hex + start, binary.constData(), size); //< Copy the binary data
                    
                    
                    }
                    
                    for(i=0;i<508;i++) printf("%c", hex[i]);
                    
                    return app.exec();
                    

                    }

                    it print garbage for hex[ ]......

                    kshegunovK 1 Reply Last reply
                    0
                    • S sachin786

                      @kshegunov thanks for reply...
                      #include "qtquick1applicationviewer.h"
                      #include <QApplication>
                      #include <QtCore>
                      #include <QDebug>
                      int main(int argc, char *argv[])
                      {
                      QApplication app(argc, argv);

                      QtQuick1ApplicationViewer viewer;
                      viewer.addImportPath(QLatin1String("modules"));
                      viewer.setOrientation(QtQuick1ApplicationViewer::ScreenOrientationAuto);
                      viewer.setMainQmlFile(QLatin1String("qrc:/main.qml"));
                      viewer.showExpanded();
                      
                      
                      bool ok = true;
                      QString filename="/home/anas/myQtApp/sachin2hex/hex.txt";
                      QFile inputFile(filename);
                      QByteArray binary; //< Prepare the byte array
                      QStringList bytes;
                      int i=0;
                      
                      unsigned char hex[508]={0x5A,0xA5,0x0B,0x01,0xF4,0x01,0x00,0x00,....position from[4] to [498] bytes data ///  << same as mention above
                      
                      if(inputFile.open(QIODevice::ReadOnly | QIODevice::Text)){
                          QTextStream in(&inputFile);
                          QString text = in.readAll();   //< text contains the file now
                      
                          bytes = text.split(',');
                          qDebug() << "bytes :: " << bytes;
                      
                          binary.reserve(bytes.size());
                      
                          foreach (QString byte, bytes)  {
                              unsigned char hexChar = byte.toInt(&ok, 0); //< Convert string to integer according to C-style rules
                              if (!ok)
                                  ; //< Error while converting, handle accordingly
                      
                              binary.append(hexChar); //< Append the char to the byte array
                          }
                      
                          qint32 start = 4, size = 498;
                          ::memcpy(hex + start, binary.constData(), size); //< Copy the binary data
                      
                      
                      }
                      
                      for(i=0;i<508;i++) printf("%c", hex[i]);
                      
                      return app.exec();
                      

                      }

                      it print garbage for hex[ ]......

                      kshegunovK Offline
                      kshegunovK Offline
                      kshegunov
                      Moderators
                      wrote on last edited by
                      #19

                      @sachin786

                      it print garbage for hex[ ]......

                      What do you expect to be printed exactly? The data is binary so any of the elements that can't be displayed will be printed as gibberish ... 0x01, 0x00 are non-printable characters, so you'd see (depending on the platform) squares or other strange symbols, this doesn't necessarily mean the data is corrupted, only that it's interpreted in a erroneous way.

                      Read and abide by the Qt Code of Conduct

                      1 Reply Last reply
                      1

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