Thread: Need help for developing an application

  1. 03-02-2006 #1
    Afrinux
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    Post Need help for developing an application

    Hi all!
    Here is the overview of the application I am trying to develop:
    Platform: Windows XP, Visual C++ 6
    Application type: MFC
    Features: Read a file sector by sector ( 2048 bytes) and display it in a tree view.

    Here are the problems I am facing:
    1. If I try to read a file which size is bigger than 1 GB, the program uses 100% of the CPU memory and then crashes

    2. When the program is reading a file, I want to display a Progress Bar in a new dialog. Using CDialog->DoModal, the dialog does pop up, but the progress bar doesnt work.

    Possible problem: When reading a file, I use a loop. Maybe the program stays in that loop too long leading it to crash.
    Any ideas, how I should make this work.
    First I want to keep the loop for reading a file, makes the program exit the loop anytimes a window message comes, and then resume the loop.
    Thanks in advance!
    Afrinux
  2. 03-02-2006 #2
    7stud
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    Any ideas, how I should make this work.
    Ask your questions in the Windows programming forum?
  3. 03-02-2006 #3
    Sebastiani
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    >> Read a file sector by sector ( 2048 bytes) and display it in a tree view.

    display *what* in the treeview - the entire file, statistics, analytic information?

    >> If I try to read a file which size is bigger than 1 GB, the program uses 100% of the CPU memory and then crashes

    chances are you won't be able to request that much memory using standard calls (new, malloc) - Windows has a function VirtualAlloc that may be helpful to you.

    >> When the program is reading a file, I want to display a Progress Bar in a new dialog. Using CDialog->DoModal, the dialog does pop up, but the progress bar doesnt work.

    try getting it to work on it's own first before incorporating it into your program - makes debugging that much easier.

    >> Maybe the program stays in that loop too long leading it to crash.

    why would you think that a loop could crash a program (by itself)? a better guess might be stack overflow due to recursive or large stack-framed functions being used inside the loop.

    by the way, we have a Windows forum here that would probably be a better place for this thread.
    Code:
    #include <cmath>
#include <complex>
bool euler_flip(bool value)
{
    return std::pow
    (
        std::complex<float>(std::exp(1.0)), 
        std::complex<float>(0, 1) 
        * std::complex<float>(std::atan(1.0)
        *(1 << (value + 2)))
    ).real() < 0;
}
  4. 03-03-2006 #4
    Afrinux
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    Hi Sebastiani and 7stud.
    Thanks for your replies. I will post it in the windows sections.
    And Sebastiani, I will make comments about your reply there.
    Thanks for your time.
    Afrinux
  5. 03-03-2006 #5
    Afrinux
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    I have moved the topic here:
    http://cboard.cprogramming.com/showthread.php?t=76477
    Moderator: Would you please lock this thread. Thanks in advance.
    Afrinux
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