Later ..when i do open my application , i will be populating the content back from File to QtextEdit value...but the format is not bold...which it should be..
my codes are:
@
void CTestDlg::boldButtonPressed()
{
QTextCharFormat fmt;

QTextCursor cursor = ui->textEdit->textCursor();

if (!cursor.hasSelection())
    cursor.select(QTextCursor::WordUnderCursor);

if( cursor.charFormat().fontWeight() == QFont::Bold  )
    fmt.setFontWeight( QFont::Normal);
else
{
   fmt.setFontWeight( QFont::Bold);
}


cursor.mergeCharFormat( fmt );

qDebug()<<"cursor.selectedText()*******************"<<cursor.selectedText();

ui->textEdit->mergeCurrentCharFormat(fmt);

}

void CtestDlg::saveToFile()
{

QString strText = ui->textEdit->tohtml();
//then storing this string value into a file..
}

void CTestDlg::readFromFile()
{
QString strText = readFile();// here i am reading exactly..what has been stored in the file
ui->textedit->settext( strText );
}
@

Please let me know..whether i am doing anything wrong on this..