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Utilizing the CProgressCtrl :: MFC

Started by kuphryn Apr 11, 2002 at 7:06 PM 3 replies 750+ views

Original Post

Apr 11, 2002 at 7:06 PM

Hi. Class CProgressCtrl is functionally simple and easy to understand. Nonetheless, I do have one question. How do you calculate the time duration from the start of a job (0% progression) to the completion (100% progression). For example, let say we have a program that converts all letters in a text file into uppercase. Original text file: a b c Output text file: A B C How do you implement a progression bar such that it displays the completetion animation accurately? I know the example above takes less than a second, but lets just imagine that it takes 10 *or* more. Thanks, Kuphryn

siaspete

Apr 11, 2002 at 7:09 PM

Perhaps the best idea is not to think in terms of time, but in terms of percent completion.

If you know the size of the file, and you know how much of it you''ve done so far, then the battle is won.

Helpful links:
How To Ask Questions The Smart Way | Google can help with your question | Search MSDN for help with standard C or Windows functions

kuphryn

Apr 11, 2002 at 8:36 PM

Thanks.

To my understanding, there no accurate way to handle the process completion percentage. We can approximate. Approximating is good enough for some programs.

Kuphryn

siaspete

Apr 12, 2002 at 9:45 AM

Yeah, this is probably why a lot of apps have jerky progress bars.

It''s easy enough when you''re linearly going through a set of items, but when you don''t know how long each item is going to take to process, it''s a bit nasty.

Helpful links:
How To Ask Questions The Smart Way | Google can help with your question | Search MSDN for help with standard C or Windows functions

kuphryn

Apr 12, 2002 at 9:54 AM

Nice!

Measuring the time someting takes to complete a cycle can be difficult if the job is fast.

Consider Microsoft''s defragmentor. I do not think the programmers use the timer measure. Sometimes the progress bar jumps 20% or more.

Kuphryn

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