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Asked: 2026-05-24T04:33:08+00:00

I am trying to read an extremely large text file. I want to write

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I am trying to read an extremely large text file. I want to write a program (C++) to read it line by line until I reach a certain set of characters, then begin to write the following text into a string until it reaches another set of characters.

It is a XML file, so I’m looking at

<flag>info</flag>

I need my program to read the file until it reaches <flag>, inputs “info” into a a string and notes that </flag> is the point to stop putting stuff into the string. What tools could I utilize that can actually read the file. As far as detecting the <flag>, I can do that.

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1 Answer

  1. Editorial Team

    Use an XML SAX parser such as Xerces; they will allow you to parse the XML file in a streaming fashion, so you don’t need to load it into memory all at once. Reading line-by-line will not give you correct results on general XML files.

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