Quote Originally Posted by SuperSonik View Post
Qt Code: 
  1. void  sendRequest(void) {
  2.    QByteArray block;
  3.    QDataStream out(&block, QIODevice::WriteOnly);
  4.    out.setVersion(QDataStream::Qt_4_2);
  5.    QString abfrage("SELECT * FROM Datum; \r\n");
  6.  
  7.    out  << abfrage.toAscii();
  8.    out.device()->seek(0);
  9.    out << quint16(block.size() - sizeof(quint16));
  10.    tcpsocket.write(block);
  11.    pushButton_abfragen->setText(tcpsocket.errorString());
  12. };//sendRequest
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I'm not sure if this code is really what you wanted to do. toAscii() method converts QString to QByteArray. QByteArray written to QDataStream is represented as array size (quint32) followed by the array bytes. So in block variable you have something like this:
Qt Code: 
  1. [x][x][x][x][S][E][L][E][C][T][...]
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and then you rewind to position 0 and overwrite first two bytes:
Qt Code: 
  1. [y][y][x][x][S][E][L][E][C][T][...]
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Is this realy what you wanted?