C# Discussion Boards - CodeProject

19-Jun-07 3:35

Is there a routine in C# that can be called to obtain a randowm number?
I am attempting to name many files with unique names. Do not want to use a counter writing to disk each time. Does anyone know of a unique number random generator in C#

Not Active19-Jun-07 3:44

Not Active

19-Jun-07 3:44

System.Random

Though I don't believe this will work for your application as depending on the number of files and seed value, the possiblity of getting the same random number is likely.

System.IO.GetRandomFileName may be better in this case.

only two letters away from being an asset

LCI19-Jun-07 4:31

19-Jun-07 4:31

I will try to use System.IO.GetRandomFileName

have a question though... will this be truly random, and not repeat at least within a large number of files generated , like maybe, every 1000 files names?

Luc Pattyn19-Jun-07 4:37

Luc Pattyn

19-Jun-07 4:37

the next number after 13 in a truly random sequence can well be 13 again. If not,
it would not be a truly random sequence.

For non-conflicting filenames, you MUST include a trial-and-error loop, since
whatever scheme you come up with, the filename you generate may already exist.

Smile | :)

Luc Pattyn

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LCI19-Jun-07 6:31

19-Jun-07 6:31

In order to use GetRandomFileName, do i have to use anything but System.IO?

It says it is not a member.
If i do System.IO.GetRandomFileName OR Path.GetRandomFileName

Not Active19-Jun-07 7:39

Not Active

19-Jun-07 7:39

This available only in 2.0 and higher

only two letters away from being an asset

Jimmanuel19-Jun-07 3:57

Jimmanuel

19-Jun-07 3:57

maybe a GUID[^] is what you're looking for

Le centriste19-Jun-07 6:42

Le centriste

19-Jun-07 6:42

System.IO.Path.GetTempFilename[^]

This returns the full path in the user temp directory, though, so it may not be what you are looking for.

-----

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Amar Chaudhary19-Jun-07 6:42

Amar Chaudhary

19-Jun-07 6:42

why are you creating random numbers
why dont you take an interger and increment it every time for every time the file name already exists

if you are dealing with larger number of files prefix or suffix ddmmyy to that number
Regards
Amar

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it is more Important to be Good

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MidwestLimey19-Jun-07 9:12

MidwestLimey

19-Jun-07 9:12

I'd concur with an earlier poster, use a GUID. In my experience the System.Random class isn't all that random, at least so far as generating 1000's of numbers a minute, unless you provide a good variation of seeds.

I'm largely language agnostic  
     After a while they all bug me  

LCI19-Jun-07 6:46

19-Jun-07 6:46

I am generating file names could be anywhere from 5 to 1000 in say 5 minutes or less. Just want to have unique names. Do not want to write to disk and increment numbers. Someone suggested that i use GetRandomFileName, but that does not seem to be able to build. Am i missing something?

LCI19-Jun-07 6:58

How to programmatically register a DLL?

19-Jun-07 6:58

Maybe i can datetime stamp the file to the millisecond.
What is the best class to use for that?

Affan Toor19-Jun-07 3:31

19-Jun-07 3:31

Hi!
My application uses a dll named "GsmCommunication.dll" which needs to be registered before running application. i want to register this dll programmaticlly when application is installed, using regsvr32 or any other command. Some one told me to use

Process.Start("regsvr32", "GsmCommunication.dll");

but it does not work, thats may be because dll is not available in "System32" folder. how can i register dll by giving its current path, i.e. the path in which application is installed..?

Please help me solving my problem...Thanks,

Regards,
Affan Ahmad Toor

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Giorgi Dalakishvili19-Jun-07 4:46

19-Jun-07 4:46

You can write a small application that registers the dll you need. The application will run only after installation process. You can get the path of the folder of the application by Application class

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Affan Toor19-Jun-07 5:05

19-Jun-07 5:05

Thnx for reply...can you be more specific about what to write in that small application? i dont have a clue of how to register dll, what classes/functions to use...?

more help please...!

Regards,
Affan Ahmad Toor

..................
QUAIDIAN FOR ONCE, QUAIDIAN FOR EVER!

Giorgi Dalakishvili19-Jun-07 5:17

19-Jun-07 5:17

Use process class to launch regsvr32.exe and specify the path of the dll as an argument to the Process.

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Affan Toor19-Jun-07 5:55

19-Jun-07 5:55

Thnx for reply...

I tried following methods but all gave error:

System.Diagnostics.Process.Start("regsvr32", Application.StartupPath + "\\GsmCommunication.dll");

Error: LoadLibrary("E:\Affan") failed - The specified module could not be found.

System.Diagnostics.Process.Start("regsvr32", Application.StartupPath);

Error: same error as above..

and then after placing GsmCommunication.dll in system32 folder i tried this:

System.Diagnostics.Process.Start("regsvr32", "GsmCommunication.dll");

Error: GsmCommunication.dll was loaded but the DLLRegisterServer entry point was not found. This file can not be registered.

please help! Frown | :(

Regards,
Affan Ahmad Toor

..................
QUAIDIAN FOR ONCE, QUAIDIAN FOR EVER!

Giorgi Dalakishvili19-Jun-07 20:29

19-Jun-07 20:29

Affan Toor wrote:
and then after placing GsmCommunication.dll in system32 folder i tried this:

System.Diagnostics.Process.Start("regsvr32", "GsmCommunication.dll");

Error: GsmCommunication.dll was loaded but the DLLRegisterServer entry point was not found. This file can not be registered.

Have you tried registering the dll from command line? Does it work? It seems that your dll can't be registered.

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Affan Toor19-Jun-07 23:30

19-Jun-07 23:30

Hi!
Thanks for reply, i tried registering dll through command line but it gave the same error. may be dll is corrupt...i will try to get its correct version.

Kindly tell me am i using the correct code to register dll and is there any way i can register dll by giving a path other than System32 folder? Because when i try to give a path, wherever a [space] comes in path it considers it as dll name and gives error.

Regards,
Affan Ahmad Toor

..................
QUAIDIAN FOR ONCE, QUAIDIAN FOR EVER!

Giorgi Dalakishvili20-Jun-07 0:48

20-Jun-07 0:48

Affan Toor wrote:
Kindly tell me am i using the correct code to register dll and is there any way i can register dll by giving a path other than System32 folder? Because when i try to give a path, wherever a [space] comes in path it considers it as dll name and gives error.

You need to surround the full path with " "

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Affan Toor20-Jun-07 4:40