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good time max How to get file count under a directory? (1 viewing) (1) Guests
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TOPIC: good time max How to get file count under a directory?
#36015
rockdale (Visitor)
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good time max How to get file count under a directory?  
Hi, I have an application which writes log files out. If then log file size is great than let's say 1M, the application will create a new log file with sequence number. the log file format likes mylogfile_mmddyy_1.txt, mylogfile_mmddyy_2.txt. ....without upper limit. Now the problem is if my application get restarted, I need to know what is the largest sequence number  of my log file. I am thinking in a loop from 1 to like 100000, check if the file exist, if it does not , then I get the max sequence number I need. But this method looks very awkward. Is there another way to do this(get the max number for a series of similar files)? My applicaiton is running on windows platform but did not using MFC function very much. Thanks in advance -Rockdale
 
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#36016
Victor Bazarov (Visitor)
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good time max How to get file count under a directory?  
My applicaiton is running on windows platform but did not using MFC function very much. Try posting to a relevant newsgroup from 'microsoft.public.*' hierarchy where Windows platform-specific stuff is discussed. V
 
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#36017
Sjouke Burry (Visitor)
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good time max How to get file count under a directory?  
Hi, I have an application which writes log files out. If then log file size is great than let's say 1M, the application will create a new log file with sequence number. the log file format likes mylogfile_mmddyy_1.txt, mylogfile_mmddyy_2.txt. ....without upper limit. Now the problem is if my application get restarted, I need to know what is the largest sequence number  of my log file. I am thinking in a loop from 1 to like 100000, check if the file exist, if it does not , then I get the max sequence number I need. But this method looks very awkward. Is there another way to do this(get the max number for a series of similar files)? My applicaiton is running on windows platform but did not using MFC function very much. Thanks in advance -Rockdale Step 100 at a time to go past the last one, then step 1 at a time trough the last partial block.
 
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#36018
mzdude (Visitor)
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good time max How to get file count under a directory?  
I have an application which writes log files out. If then log file size is great than let's say 1M, the application will create a new log file with sequence number. the log file format likes mylogfile_mmddyy_1.txt, mylogfile_mmddyy_2.txt. ....without upper limit. Now the problem is if my application get restarted, I need to know what is the largest sequence number  of my log file. I am thinking in a loop from 1 to like 100000, check if the file exist, if it does not , then I get the max sequence number I need. But this method looks very awkward. Is there another way to do this(get the max number for a series of similar files)? My applicaiton is running on windows platform but did not using MFC function very much. Well for starters you can create simple text file to contain the next numeric number in your log sequence. Every time you increment your log file number, update the text file. Then it's simply a matter of opening and reading the number. The which Operating System (windows, linux, ..) or library (mfc, boost, ...) you are using is irrelevant. NextNumber.txt   1234
 
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#36019
Juha Nieminen (Visitor)
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good time max How to get file count under a directory?  
Is there another way to do this(get the max number for a series of similar files)? http://www.boost.org/doc/libs/1_40_0/libs/filesystem/doc/index.htm
 
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#36020
Marcel Müller (Visitor)
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good time max How to get file count under a directory?  
My applicaiton is running on windows platform but did not using MFC function very much. That makes no difference here. Using rotating logs with a fixed time slice is straight forward to implement, although in case of application restarts. You could use a simple and fast hash function on the time stamp, that controls log file switches. Every time the hash changes a virtual method that switches the log could be invoked. Only his method implements the full rendering of the file name scheme. This makes it very easy and with good performance to implement different cycle times, e.g once per week, once per day and once per hour. And if you are even smarter you could add a functionality that cleans up old log automatically once they exceed a configured age. This prevents from the common issue of full volumes. Again a fixed relation between the file name and the content is helpful. All you have to do is to calculate the file name that corresponds to now minus a configured period and delete all files in the folder which names compare less to this name and which match the pattern of your logfiles, e.g. mylogfile_*.txt. Neither you have to touch their content nor you have to parse the names. Unfortunately this will always be O(n), so it should not be invoked too often (e.g. once a day). Marcel
 
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