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hi
I am not able to find the exact meaning of data compression algorithm(i.e deflate). is it any way related to data encryption or just creating an archive file? i have to implement this using the VB6. so please suggest me the best method to do that.
Kind Regards
Sandy
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Are you working with data compression or data encryption?
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Paul Conrad wrote: Are you working with data compression or data encryption?
Hi
its actually kind of doing both with the name of data compression. but i am not sure wat data compression actually means.
1) encrytping data to make the file size less?
2) Zipping it inorder to reduce the file size?
What exactly it is?
Kind Regards
Sandy
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Data compression is to make the data smaller, reducing the size in memory or in a file. Data encryption is securing the data so unauthorized people cannot view the data. You can have both work together. For example, compress the data first, and then encrypt the compressed data. To undo the action I've just mentioned, you'd then decrypt the data and then uncompress the data for viewing, processing, etc. There are plently of compression libraries that can be googled and articles on this site.
Hope this helps,
Paul
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Thank youvery much i think i can now be able to do my job. thanks for that suggestion
Kind Regards
Sandy
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The best way to do it is to look for a component that will do it for you. Google results[^] for "vb6 data compression .zip".
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi there,
1. How to control the textbox allows alphabets only. i want to know is there any other method beside Keypress event().
2. how to control the textbox allows alphanumeric values. For example Ic No. S1234567D
- so i want 1st character to be Alphabet and other 7 be numeric and the last 1 be alphabet.
I'm thinking for 2 weeks still i couldn't find a solution. HELP ME!!
Thanx in Advance.
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Simple programmer wrote: 1. How to control the textbox allows alphabets only. i want to know is there any other method beside Keypress event().
The only other place in the KeyDown event of the TextBox.
Simple programmer wrote: . how to control the textbox allows alphanumeric values. For example Ic No. S1234567D
- so i want 1st character to be Alphabet and other 7 be numeric and the last 1 be alphabet.
Same thing as #1. But the best method would be to use a RegEx expression to check the string in the TextBox, combined with the current KeyDown character, for the proper format.
Or you could just use a MaskedEdit control[^] to do the same thing... In VB.NET 2005, there's already one of these in the ToolBox.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi Dave,
Thanx a lot. i will try it out. Hope it works.
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I have added refrence of microsoft flexgrid.
However , the toolbox could not show the control.
Help me.
Thanks a lot!
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You have to add it to the ToolBox yourself. Just adding a reference to the .OCX won't do it. Right-click inside the Toolbox and pick Add/Remove Items... I think you can figure it out from there.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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need help... how to integrate some data of the application-1 to be used or display to the other application-2....
Thank
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Would you care to elaborate on this?? It doesn't tell us anything about what you're really trying to do or what you're even thinking of doing.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Don't cross post  You asked this same question in the SQL forum.
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Hey everyone,
I've been looking around for some advice on OpenGL with VB.NET. I spent the last year learning and refining my ability with VB.NET and want to move into the 3D world.
I have 2 questions:
1. Would it be better for me to pickup C++ again to program this in or is there not too big of a differece? At what point (if any) is the difference noticeable?
2. I've pretty much only see "Tao" and "CsGL" as ways to use OpenGL. Any recommendations/alternatives?
I want to essentially program a simple "game" where you login, it shows you a sprite of some kind, you can move around and interact with objects, etc. Long term, if I can make a real game out of it... great. Other than that, just doing it for the experience.
Thanks,
Mike
Gaming at the GuildofBlades.com is the only way to really experiece the level 99 Soul-Sucking Sword!
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Have you reviewed this article? It talks about using CsGL in VB.NET.
Best,
Jun
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I'm working on an applicaiotn that distributes files -- as they come into one directory, the file name is parsed, and the file is moved to the appropriate output directory based on the name.
I have it working well for the case where a file in the monitored directory is changed, or copied in from a local location.
I have two issues I'm having a problem coding for:
1) If the program starts and there are already files in the directory, I want it to work through the file list one at a time and process the files appropriately.
2) Sometimes the file is transferred in via FTP so it fires multiple change notifications. I want to ignore them until the transfer is done.
Thanks in advance for any help you can give!
best,
Scott
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STemaat wrote: If the program starts and there are already files in the directory, I want it to work through the file list one at a time and process the files appropriately.
OK, what's the big deal? Use the Directory class and it's GetFiles method to get a list of files in the directory and start feeding them to whatever routine you've written to process the files.
STemaat wrote: Sometimes the file is transferred in via FTP so it fires multiple change notifications. I want to ignore them until the transfer is done.
There is no Closed notification in the FileSystemWatcher. It's impossible for it to know when another application is completely finished with a file before it notifies you. You're only workaround is to, every so often, try and open the file with exclusive rights (DenyShareRead and DenyShareWrite). Once the file successfully opens, you've got a pretty good indicator of whether or not the file is done being written by the FTP server. This, of course, depends entirely on the functionality of the FTP Server that you're using and how it writes to files as they're being uploaded.
Dave Kreskowiak
Microsoft MVP - Visual Basic
-- modified at 14:52 Monday 26th June, 2006
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>>>OK, what's the big deal? Use the Directory class and it's GetFiles method to get a list of files in the directory and start feeding them to whatever routine you've written to process the files.
Hmm...someone here is a NOOB (namely me)
>>>You're only workaround is to, every so often, try and open the file with exclusive rights (DenyShareRead and DenyShareWrite).
Okay, think I can handle that.
Thanks.
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STemaat wrote: >>>OK, what's the big deal? Use the Directory class and it's GetFiles method to get a list of files in the directory and start feeding them to whatever routine you've written to process the files.
Hmm...someone here is a NOOB (namely me)
 You never said what part of that you were having a problem with...
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Really what I was hoping for was a code snippet in both cases. I am having a hard time finding examples I can wrap my mind around/adapt, and neither topic is covered well in the textbook for the class I took last semester.
I think I'm getting my mind warapped around the first one...my thought is to simply "touch" every file that happens to be in the directory, which would fire the changed event of the watcher.
First concept that comes to mind on the second issue is putting the file open into an Until loop.
Am I on the right track?
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STemaat wrote: I think I'm getting my mind warapped around the first one...my thought is to simply "touch" every file that happens to be in the directory, which would fire the changed event of the watcher.
You could do that, but the FileSystemWatcher has been known to miss events now and then when firing alot of them all at once. "Touching" the files involves extra work you don't have to do. Just get the list of files and pass each one to the routine that does the processing. The event handler for the FSW should be doing the same thing.
STemaat wrote: First concept that comes to mind on the second issue is putting the file open into an Until loop.
Yep. All you have to do is put the thread to sleep for a little while, maybe one second, inside the loop if the Open fails. That way you're not bogging down the system.
Dim attempting As Boolean = True
While attempting
Try
' Open the file for exclusive read/write
' close it
' pass the filename to some method to do the actual processing
attempting = False
Catch
Thread.Sleep(1000)
End Try
End While
Dave Kreskowiak
Microsoft MVP - Visual Basic
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As a follow-up...I fixed the second part of the problem by changing the Watcher trigger to changed, instead of created. That was all I needed in this case 
Got the ifrst part handled, too. Thanks for your help!
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hey i would like help some help regarding the playback speed...
i would like to increase or decrease the speed with which an audio file is played..depending on the users choice..it shuould be variable in as low as 5% increment/decrement.
help me i am new
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This depends entirely on the object or API that you're using to play the audio file. If you're using just the Win32 API, you can't change the playback speed. In this case, you'll have to find a 3rd party media player that supports what you want.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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