[Adan]

How to read and store data in multi vector in C++ Could anyone please show me an example how to perform substring to remove T1,T2 part.. and how to split them in a code.

[ShikhaTan]

Try this sample, please let me know if something is not clear

  std::ifstream ifs ("test.txt", std::ifstream::in);//Read the file in input mode
  string eachline;
  while(getline(ifs,eachline)){//Read each line into a string
    if(!ifs.good())//if it (file state) is no more valid break and close the file
        break;
    stringstream txtStream(eachline);//Insert the string to string stream for further processing
    txtStream.ignore(eachline.length(),':');// Ignore the T1: part since we are not interested in it
    std::string token;//to contain each element that we are interested in
    while(std::getline(txtStream, token, ',')) {//Get elements seperated by comma into the token variable.
        
        std::cout << token << ',';// This token might still contain white spaces
    //You can read this token and insert into your vector
    }
    std::cout << endl;//Insert new line
  }
  ifs.close();//Close the file stream handle

[Abhey]

keep the file handle open for as less time as possible in case if it is a shared resource. If it involves pretty straightforward and small amount of string processing it might still not create any problems. But if you plan to do more string processing and formatting after reading each line and if file can contain lot of records then it would be ideal that you read the entire file into a string. And the perform all the string processing and formatting in memory without keeping the file handle open for the entire time when string processing is done. It depends on how the file is updated by other clients