File Access Speed

    Hallo,
    Following function calls are used to get the file version information in my code:
    1. GetFileVersionInfoSize
    2. GetFileVersionInfo
    3. VerQueryValue


    The first call takes about 2.5 second, the rest two calls run as expected. If the first call is replaced by a fixed number (the function call is commented out), the second call takes about 2.5 second.
    I have also noticed that it takes long time to show the content while opening windows explorer.


    I guess the problem is because of file access speed.


    The problem appears in NetDCU14, but not in NetDCU10.


    I need your help!


    Thanks in advance,
    Qing

    Hello,


    when you call "GetFileVersionInfoSize" twice, only the first call takes 2.5s?
    I assume the modul (whiche contains GetFileVersionInfoSize) is loaded on demand, so the time for the first call is load time + execution time. Time for following calls are execution time only. Right?

    Thank you for your reply.


    if I call "GetFileVersionInfoSize" twice with same file name, only the first one takes about 2.5s. But if I do it with different file name, the second one takes even longer (about 2.8s).

    Hello,


    this is very strange. I did not expect such a behavior.
    Does the "call" time denpend on the file size?

    F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

    Hallo,


    Yes, the time consumption varies depending on the file size.
    Both files, which were used in the function call, are about 6MB.
    If the second file is replaced by a small one which has only about 140KB, the second call costs only about 60 ms.