Txt file data to Qmap

Chandras002

Dear Qt friends, I am try to read txt file info to QMap as following code.
The text file has IP info separated by new line,
Name: IP info
IP address :10.1.1.10
Port: 8888
the lst output is ("Name:IP info", ..... ," ")
on the Qmap insert getting error "no matching function for call to
'QMap<long long int, QString>::value(const QString&)'

Am i miss something, i saw many similar error posted on forum but as get how to solve this (i an new to Qt) . Any thoughts/ suggestion highly useful.

void Save()
{
    int c = -1;
    QFile inputFile("C:\\Users\\IP_info.txt");
    QMap<qint64,QString> map;
  

    if (!inputFile.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        qDebug()<<"Could not open input file";
        return;

     }
    while (!inputFile.atEnd())
    {
           const QByteArray alldata = inputFile.readAll();
           const QString str(alldata);
           const QStringList lst = QString(alldata).split('\n');

           qDebug()<<lst;
          // const QString str(line);
          // const QStringList lst = line.split('\n');

           for (int i=0; i<lst.size(); i++)
            {
               if (!map.value(lst.at(i)))  //getting error 
             //    if (!map.containslst.at(i))) 
                {
                    map.insert(lst.at(i),++c);
                }
            }
           qDebug() << map;
            inputFile.close();
        }
}

mrjj

hi
Your map is
QMap<qint64, QString>
So int as key, and string as value.

and you try to call so
http://doc.qt.io/qt-5/qmap.html#value
!map.value( lst.at(i) )
but is lst.at(i) not a string and your key is qint64 ?
So should it not be
http://doc.qt.io/qt-5/qmap.html#contains
if you try checking if u already have key ?
also, is
lst.at(i) ment to be the qint64? but just as text ?

else it seems a bit reverse to me.

Chandras002

yes, you are right it was reversed. The following code store values in QMap. now i want the QMap key, String (value) into a another txt file. (Copy_IP_Info. txt) After written into new txt file (Copy_IP_Info) , the program objective

have to check in certain interval of original IP_Info.txt
If any info (value) changed in original file like IP address changed but Port number is same then only IP address should be updated to copy_IP_info file.

Is it too complex? STL containers are new to me.. am i miss anything.. .any suggestion highly useful.


 for (int i=0; i<lst.size(); i++)
            {


              // if (!map.value(lst.at(i)))
                {
                    map.insert(++c,lst.at(i));
                }

            }

QMap((0, "Name:Follower2")(1, "IP_address:192.168.27.38")(2, "PORT_number:88888")(3, "Time_stamp:25th June 2018:3.00am")(4, "Version:1.0")(5, ""))
r code here

mrjj

@Chandras002
But its not really possible to update in the middle of a text file without rewriting the whole file.
so unless its sort of a binary fixed record file, you will have to write the other data too.
Im not really sure in what way Copy_IP_Info is different original IP_Info.txt
except maybe its other format?

Chandras002

@mrjj : Hi, I got your point. Can not update the particular string... have to write whole file. Copy_IP_info.txt can be LOG file.
In case, i want to append the latest data from IP_Info.txt for every 10 min with time stamp.. So, know the connection status details. Any thoughts?
Thanks,

Cheers!
chandra

jsulm

@Chandras002 If you want to append at the end of the file then there is no need to overwrite the whole file, just open it in append mode.

file.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append);