How to Create Demo Version of C#.Net Window project - C# Discussion Boards

Re: How to Create Demo Version of C#.Net Window project

5-Feb-09 3:04

Use third party tool, try .Net Reactor

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musefan5-Feb-09 3:08

5-Feb-09 3:08

Well if its just simple then store the first use date in the registry and check that with each load of the aplication

Not secure thou.

You want something secure you should probably look into 3rd party apps, but they will most likely cost you money.

Or encrypt something somewhere yourself, but given that you posted this question, prob best to avoid that approach for now

My opinion is... If someone has already posted an answer, dont post the SAME answer

Memory Leak ?

Xmen Real 5-Feb-09 2:20

5-Feb-09 2:20

will this code leak the memory :

public class ABC
{
static Image aimage1;
static Image aimage2;
static Image aimage3;

public static Image AImage1
{
get{ return aimage1;}
set{ aimage1 = value;}
}

public static Image AImage2
{
get{ return aimage2;}
set{ aimage2 = value;}
}

public static Image AImage3
{
get{ return aimage3;}
set{ aimage3 = value;}
}

public static void Load()
{
AImage1 = Image.FromFile("C:\a.png");
AImage2 = Image.FromFile("C:\b.png");
AImage3 = Image.FromFile("C:\c.png");
}
}

musefan5-Feb-09 2:28

5-Feb-09 2:28

I dont think so, but not sure.

Thou using image.fromfile() makes that files readonly and can be a pain when doing any deleting functions. i usually find it best to create the image from a stream

My opinion is... If someone has already posted an answer, dont post the SAME answer

Xmen Real 5-Feb-09 2:32

5-Feb-09 2:32

musefan wrote:
Thou using image.fromfile() makes that files readonly and can be a pain when doing any deleting functions

what do you mean ?

musefan5-Feb-09 2:46

5-Feb-09 2:46

I fount that having code such as

Image image = Image.FromFile("C:\\pic.png");

meant that while that image was in memory, the file could not be deleted. Appears to be a reference to the actually file (or something)

Maybe im mistaken but im pretty sure that was an issue

My opinion is... If someone has already posted an answer, dont post the SAME answer

Tom Deketelaere5-Feb-09 2:50

Tom Deketelaere

5-Feb-09 2:50

musefan wrote:
Maybe im mistaken but im pretty sure that was an issue

No your not mistaken.

Image.fromfile keeps the file locked until the object is disposed off.

Ran into this when I was displaying an image in a picture box with this function. Ended up using the stream method like you said.

musefan5-Feb-09 2:52

5-Feb-09 2:52

Thank you for the good, simple explaination of what i was trying to get at Smile | :)

My opinion is... If someone has already posted an answer, dont post the SAME answer

Xmen Real 5-Feb-09 2:52

5-Feb-09 2:52

musefan wrote:
Appears to be a reference to the actually file

hehe no, I think it does the same thing as stream. Will you tell what was the thing that made you think that ?

musefan5-Feb-09 2:55

5-Feb-09 2:55

I found:

using .FromFile() causes problems and
using .FromStream() did not cause problems

what more can i say, i didnt need to look into it anymore

My opinion is... If someone has already posted an answer, dont post the SAME answer

Xmen Real 5-Feb-09 2:59

5-Feb-09 2:59

okay, see that was just a little part of my class. Actually im reading the images like this

BL = new Bitmap(new MemoryStream(tmp_br.ReadBytes(tmp_br.ReadInt32())));

Since i wrote that code(in first post) in CodeProject, so i thought to write Image.FromFile()

Rob Philpott5-Feb-09 2:53

Rob Philpott

5-Feb-09 2:53

No it won't leak as such. You have to try pretty hard to get .NET to leak properly.

Image is disposable though, so you might want to dispose of images when you're done with them otherwise they might hang around longer than you want. (that'd release the file too).

Regards,
Rob Philpott.

musefan5-Feb-09 2:57

5-Feb-09 2:57

yeah i went down the dispose route at first when using .FromFile() but found it more hassle then creating one function that returns an Image from a stream by passing the filepath

My opinion is... If someone has already posted an answer, dont post the SAME answer

Xmen Real 5-Feb-09 3:01

5-Feb-09 3:01

yes

http://www.codeproject.com/script/Forums/View.aspx?fid=1649&msg=2912374