Re: Compression - C# Discussion Boards

2-Oct-07 9:08

I am working with large files in a compressed state. From what I can find it is not possible to copy compressed files without uncompressing first. Does anyone know if it is possible to copy compressed files compressed? As I am writing the code in C# I have included the question here.

Thanks for any help.

Jim

this thing looks like it was written by an epileptic ferret
Dave Kreskowiak

TJoe2-Oct-07 9:11

2-Oct-07 9:11

What do you mean by "copy"?

Take care,
Tom

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Check out my blog at http://tjoe.wordpress.com

Jim Warburton2-Oct-07 9:21

2-Oct-07 9:21

The archive contains 3-7 files, if a change is made to one file the old archive is maintained "as is" and a new one with the change is created. The files which were not changed need to be added to the new archive, or copied.

Jim

this thing looks like it was written by an epileptic ferret
Dave Kreskowiak

Dan Neely2-Oct-07 9:24

Dan Neely

2-Oct-07 9:24

to modify the contents of a compressed archive it will need decompressed and recompressed afterwards. I suspect you can find a library that will hide the details for you.

--
If you view money as inherently evil, I view it as my duty to assist in making you more virtuous.

TJoe2-Oct-07 9:25

2-Oct-07 9:25

What library are you using to create your archives?

Technically, it's possible to copy a file from one archive (e.g. a .zip file) to another archive without decompressing it first. But this really depends on the archive's format. For example, I think you can do it with .zip files, but other formats I'm not sure. In reality, I'm not sure if archive libraries have this type of feature.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Jim Warburton2-Oct-07 9:34

2-Oct-07 9:34

I have been working mostly with #ZipLib which does use the .zip files. Any thoughts on where I can look for how to do the copy compressed?

Jim

this thing looks like it was written by an epileptic ferret
Dave Kreskowiak

TJoe2-Oct-07 9:39

2-Oct-07 9:39

I haven't tested this, but it looks liks you can get the ZipEntry from the first archive and add it to the second archive. You may need to Clone the ZipEntry.

Let me know if this doesn't work.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Jim Warburton2-Oct-07 10:06

2-Oct-07 10:06

That does the trick, thanks

Jim

this thing looks like it was written by an epileptic ferret
Dave Kreskowiak

Nathan Holt at EMOM2-Oct-07 9:14

Nathan Holt at EMOM

2-Oct-07 9:14

jimwawar wrote:
Does anyone know if it is possible to copy compressed files compressed?

I would guess that the methods for copying just any file would work fine.

Nathan

Jim Warburton2-Oct-07 9:26

2-Oct-07 9:26

What I have been able to find and play around with, as soon as the compressed file is put on a stream for copying it is uncompressed. To put it into another archive requires re compression. As the file sizes are gig this is a heavy time/cpu crunch. If the copying could be done compressed the time/cpu would be saved.

Jim

this thing looks like it was written by an epileptic ferret
Dave Kreskowiak

Dan Neely2-Oct-07 9:56

Dan Neely

2-Oct-07 9:56

double zip the files?

ie zip each file separately at your chosen level of compression, and then use a 0% compression outer zip as a container. Inserting/extracting from the outer zip should be no more expensive than any other file copy operation.

--
If you view money as inherently evil, I view it as my duty to assist in making you more virtuous.

How do i calculate time differences? [modified]

Dan Neely2-Oct-07 9:22

Dan Neely

2-Oct-07 9:22

you can copy an compressed bytestream just as easily as an uncompressed one. The copy will also be compressed. If you want an normal copy you'll need to decompress it first.

--
If you view money as inherently evil, I view it as my duty to assist in making you more virtuous.

Netron Project

Bassam Abdul-Baki2-Oct-07 8:53

Bassam Abdul-Baki

2-Oct-07 8:53

Lithium actually.

Does anyone know how to enable auto-scroll in the Lithium control of the Netron project?

Thanks.

"There are II kinds of people in the world, those who understand binary and those who understand Roman numerals." - Bassam Abdul-Baki

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Re: Netron Project

Pete O'Hanlon2-Oct-07 10:10

Pete O'Hanlon

2-Oct-07 10:10

Select the lithium control and set the AutoScrol property to True. Sorry if the answer sounds fascetious, but that's what I did when I used it.

Deja View - the feeling that you've seen this post before.

Re: Netron Project

Bassam Abdul-Baki2-Oct-07 10:18

Bassam Abdul-Baki

2-Oct-07 10:18

Thanks, but I actually went through all the properties and saw that one. Didn't do squat. I also tried setting it programmatically using, but to no avail.

lithiumControl.AutoScroll = true;
lithiumControl.HorizontalScroll.Enabled = true;
lithiumControl.VerticalScroll.Enabled = true;
lithiumControl.HorizontalScroll.Visible = true;
lithiumControl.VerticalScroll.Visible = true;

The version I'm using is v3.3.2831.18624 from SourceForge[^].

Any other suggestions? The example it came with also does not scroll.

"Dissent is the highest form of patriotism." - Thomas Jefferson

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Re: Netron Project

Bassam Abdul-Baki5-Oct-07 8:39

Bassam Abdul-Baki

5-Oct-07 8:39

Do you still have your last working example or do you have any graph suggestions?

"Oh, what a tangled web we weave, when first we practice to deceive." - Sir Walter Scott

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NvN>C2-Oct-07 6:59

NvN>C

2-Oct-07 6:59

I am trying to calculate time differences in C#, I get the start time in a Lable1 and end time in Lable2, and The start time can start at 23:30 and end time at 0:30hrs, I am only looking for difference in time. Please advice.

Naveen

-- modified at 14:51 Tuesday 2nd October, 2007

It will help a lot if i can get the Code.. Smile | :)

Naveen

Ajay.k_Singh2-Oct-07 8:24

Ajay.k_Singh

2-Oct-07 8:24

You may subtract one time from other if you store data in two variables of DateTime type.

Such as-

DateTime i,j;

j.Subtract(i);

I hope this helps Smile | :)

.

-Dave.

Dave Traister,
ComponentOne LLC.
www.componentone.com

ChrisKo2-Oct-07 9:40

ChrisKo

2-Oct-07 9:40

Dave already gave you the answer, is it really that hard to understand what he explained?

DateTime startDate = DateTime.Parse(Label1.Text);
DateTime endDate = DateTime.Parse(Label2.Text);
TimeSpan span = endDate - startDate;

NvN>C4-Oct-07 5:05

NvN>C

4-Oct-07 5:05

Thanks Chris
You'r code helped me a lot...
Appreciate your help...

TJoe2-Oct-07 9:55

Create config file in Visual studio installer

2-Oct-07 9:55

Both Dave and Chris explain how to calculate the difference, but you really need the date part also. In your example, the time rolls over to the next day. So you really need the difference from (I just made up a date) "10/2/2007 23:30" to "10/3/2007 00:30" (a difference of 1 hour). If you just take the time, then the date part will most likely be the same and then the difference is 23 hours.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

WhoisUrBuddy2-Oct-07 6:54

WhoisUrBuddy

2-Oct-07 6:54

Hi Guys,
Application is almost done and now I'm trying to write the installer. Problem is I'm using an XML file for some of the configuration and I can't find how to create one using the installer.

Is there something built into visual studio that can do this or will I have to write create some sort of post-install script?

Re: Create config file in Visual studio installer

TJoe2-Oct-07 7:22