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Asked: 2026-05-14T19:07:28+00:00

how does large text file viewer work ? I’m assuming that: Threading is used

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how does large text file viewer work?

I’m assuming that:

  • Threading is used to handle the file
  • The TextBox is updated line by line
  • Effective memory handling is used

Are these assumptions correct? if someone were to develop their own, what are the mustsand don’ts?

I’m looking to implement one using a DataGrid instead of a TextBox

I’m comfortable with C++ and python. I’ll probably use QT/PyQT

EDIT

The files, I have are usually between 1.5 to 2 GB. I’m looking at editing and viewing these files

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1 Answer

  1. Editorial Team

    I believe that the trick is not loading the entire file into memory, but using seek and such to just load the part which is viewed (possibly with a block before and after to handle a bit of scrolling). Perhaps even using memory-mapped buffers, though I have no experience with those.

    Do realize that modifying a large file (fast) is different from just viewing it. You might need to copy the gigabytes of data surrounding the edit to a new file, which may be slow.

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