QFile and QTextStream problems

[uchennaanyanwu]

Hi Guys,

I declared a QFile* and QTextStream* pointers in a class called HistoricalInfo, then I instantiated them and the following function:

int HistoricalInfo::Load(const QString & strFilename)
{
 
    file = new QFile(strFilename);    //create new file, attached to a file name
 
    reader = new QTextStream(file);    //point reader to the file
 
    if (!file->open(IO_ReadOnly | IO_Translate))    //test that file is opens sucessfully
    {
        errno = ENOENT;        //exit if not opened correctly
        return 0;
    }
 
    reader->setDevice(file); //set device
...
}

int HistoricalInfo::Load(const QString & strFilename)
{

    file = new QFile(strFilename);    //create new file, attached to a file name

    reader = new QTextStream(file);    //point reader to the file

    if (!file->open(IO_ReadOnly | IO_Translate))    //test that file is opens sucessfully
    {
        errno = ENOENT;        //exit if not opened correctly
        return 0;
    }
    
    reader->setDevice(file); //set device
...
}

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Then, I call following function (HistricalData_Read()) ), which was called by another function ...

void HistoricalInfo::HistoricData_Read()
{
    QString line;
    while (!(line = reader->readLine()).isNull())    //read lines from the file until there is no more data
    {
        if (line.isEmpty())    //if line is empty then go to the next line
            continue; 
        if(line == "*")        //if line is a star(delimiter) then ...
        {            //we have found a whole data set then break
            break;
        }
        if(!Extractinfo(line, recSpeed))  //we can parse the line
            printf("error occured while extracting historical data\n");    //or error out!
    }    
    LoadHistoricalinfo();    //load segement data into a list    
}

void HistoricalInfo::HistoricData_Read()
{
    QString line;
    while (!(line = reader->readLine()).isNull())    //read lines from the file until there is no more data
    {
        if (line.isEmpty())    //if line is empty then go to the next line
            continue; 
        if(line == "*")        //if line is a star(delimiter) then ...
        {            //we have found a whole data set then break
            break;
        }
        if(!Extractinfo(line, recSpeed))  //we can parse the line
            printf("error occured while extracting historical data\n");    //or error out!
    }    
    LoadHistoricalinfo();    //load segement data into a list    
}

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I keep getting a segmentation fault in the

while (!(line = reader->readLine()).isNull()) ..line.

while (!(line = reader->readLine()).isNull()) ..line.

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Can anyone please help me ?