Component question. - C# Discussion Boards

Unmanaged DLL persistance in C# [solved]

Trollslayer21-May-09 7:32

21-May-09 7:32

I am using an unmanaged DLL which will be accessed from a Windows application.
After I have first called a function within it, will it stay in memory until the form closes?
There are a number of variables within it I need to be able ot rely on.
Thanks.

Elaine Rose | [Rose]

Visit http://www.notreadytogiveup.com/[^] and do something special today.

modified on Thursday, May 21, 2009 2:18 PM

Re: Unmanaged DLL persistance in C#

Dave Kreskowiak21-May-09 8:00

Dave Kreskowiak

21-May-09 8:00

It'll stay in memory as part of your app's process until the app closes, not the form.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Re: Unmanaged DLL persistance in C#

Trollslayer21-May-09 8:18

Trollslayer

21-May-09 8:18

Thanks Dave, that is what I was hoping for.

Visit http://www.notreadytogiveup.com/[^] and do something special today.

Re: Unmanaged DLL persistance in C#

Luc Pattyn21-May-09 8:20

Luc Pattyn

21-May-09 8:20

Apparently someone didn't agree with you, you got my 5 to compensate a bit.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

Re: Unmanaged DLL persistance in C#

0x3c021-May-09 8:22

0x3c0

21-May-09 8:22

And mine just to spite the uni-voter

Re: Unmanaged DLL persistance in C#

Henry Minute21-May-09 8:32

Henry Minute

21-May-09 8:32

Ditto

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

What tables is needed for create workflow applications ?

hdv21221-May-09 7:13

hdv212

21-May-09 7:13

Hi i want to create a sequantial workflow app (without wf), i'm looking for what tables is needed to implement this, for example we need some tables like workflowTypes, workflowSteps, workflowActivities, ... .
can anybody help me and have experience in this issue ?
thanks

Component question.

precious roy21-May-09 7:11

precious roy

21-May-09 7:11

Hi I was just wondering I made a component off an example on this site. Now I wish to post it for everyone to use. But how would I do that. I’m not that talkative person so I can’t really write about it so much. What would be the best cause of action???

Re: Component question.

Dave Kreskowiak21-May-09 7:58

Dave Kreskowiak

21-May-09 7:58

Writing an article is about the best option you have. Or post it on your own personal blog.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Re: Component question.

DaveyM6921-May-09 10:23

DaveyM69

21-May-09 10:23

If you want, have a go at writing an article in plain text, then drop me an email from the link at the bottom of this message. I'll mail you back and you can send me the code and text. I'll see if there's anything I can do to make it 'article worthy' for you.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

Re: Component question.

precious roy21-May-09 10:52

precious roy

21-May-09 10:52

thank you i will see if i have time for it tomorrow.. do i need to post a link in the article that helped me?

Re: Component question.

DaveyM6921-May-09 11:46

DaveyM69

21-May-09 11:46

I wouldn't post a link in the other article's forum as it might be seen as a 'hijacking' attempt, unless the other article is no longer supported by the author and you are offering to take over support.

Definately make sure there's in link in your article to the original and explain what's different/improvements etc.

Drop the author of the other article a private email letting him know what you've done so he can edit his article to link to yours if he wants.

These aren't rules, just my personal opinion. Smile | :)

Coloring pictures

Sokka9321-May-09 6:56

Sokka93

21-May-09 6:56

Hello I'm using the below code to color a picture but it is pretty slow is there a way to do it faster?
Thanks in advance.

<br />
Bitmap Turn(Bitmap pic)<br />
        {<br />
            Bitmap newpic = new Bitmap(pic.Width, pic.Height);<br />
            for (int i = 0; i < pic.Width; i++)<br />
            {<br />
                for (int j = 0; j < pic.Height; j++)<br />
                {<br />
                    Color color = pic.GetPixel(i, j);<br />
                    newpic.SetPixel(i, j, Color.FromArgb(123, 46, 125));<br />
                }<br />
            }<br />
            return newpic;<br />
        }<br />

Re: Coloring pictures

Henry Minute21-May-09 7:15

Henry Minute

21-May-09 7:15

Why are you retrieving the color from pic when you don't use it?

Here

Color color = pic.GetPixel(i, j); <=============================== this never gets used.
newpic.SetPixel(i, j, Color.FromArgb(123, 46, 125));

But if your newpic is to be all one color, look up the Graphics class, and the Fill method of that class.

Re: Coloring pictures

Dave Kreskowiak21-May-09 7:58

Dave Kreskowiak

21-May-09 7:58

Search the articles for "Image processing for dummies" and you'll find a series of articles that covers just what you're looking for.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Re: Coloring pictures

Luc Pattyn21-May-09 8:28

Luc Pattyn

21-May-09 8:28

Hi,

1.
an easy win is to replace pic.Height by a variable that gets initialized only once.

2.
for a fixed color, there are better ways, as Henry already mentioned. Here is one:

Graphics g=Graphics.FromImage(newpic);
g.FillRectangle(...);
g.Dispose();

3. the general solution for maximum performance is using pointers, avoiding GetPixel/SetPixel since these methods will perform boundary checks and coordinate conversions for each individual pixel.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

Re: Coloring pictures

Henry Minute21-May-09 8:36

Henry Minute

21-May-09 8:36

I have realised that I made a typo, had a brain fart, in my previous post.

I should have said
If it is going to be one color investigate the Graphics class and the Clear method of that class. Although the various Fill methods are good to know.

Re: Coloring pictures

Sokka9321-May-09 9:03

Sokka93

21-May-09 9:03

Thank you all for your good answers.

Pop3, Smtp, etc..

Quake2Player21-May-09 6:36

Quake2Player

21-May-09 6:36

Hi,

Pop3 and Smtp work the sameway.. one sends a string message to the server (eg: HELO, USER user, PASS pass) and the server responses (eg. 250 Hello and welcome)

Is there any standard class for this type of communication? something simple like
+Connect()
+Write(s)
+LastResponse()

Because i'm not getting good results ..though i'm trying to communicate with gmail's pop and smtp, so maybe i'm failing with the SSL thing..

I'm having trouble with the Writing and Response,

public string SendMessage(string message)
{
ASCIIEncoding asciiEncoder = new ASCIIEncoding();

byte[] WriteBuffer = new byte[1024]; // 1 KB
WriteBuffer = asciiEncoder.GetBytes(message);

NetworkStream stream = cl.GetStream(); // cl is a TcpClient

stream.Write(WriteBuffer, 0, WriteBuffer.Length);

// Get response after message
return Response();
}

And my response method is:

public string Response()
{

byte[] serverbuffer = new Byte[1024]; //1 KB

int count = ns.Read(serverbuffer, 0, 1024);
if (count == 0)
{
return "";
}

return Encoding.ASCII.GetString(serverbuffer, 0, count);

}

Break Point

kibromg21-May-09 6:08

kibromg

21-May-09 6:08

Hi All,

My break points doesnt not work.I break on a certain part of my code and when i run the code it doesnt stop at the break point.

Could you please advice?

Thank you in Advance.

Many thanks

Re: Break Point

Henry Minute21-May-09 6:21

Henry Minute

21-May-09 6:21

This often means that a piece of code that you expected to be called isn't, for some reason. Usually, because of an error in coding, or it is with me. Smile | :)

What I do is to place a break point in the calling code for your original break, and keep moving up the calling chain until something bites.

When that happens, step through until you discover the error.

If that doesn't work, I go for a cup of coffee and a lie down.

Re: Break Point

kibromg21-May-09 6:28

kibromg

21-May-09 6:28

If that doesn't work, I go for a cup of coffee and a lie down Hahahahahah.....

Thanks very much Henry.Its Much appreciated.The problem with my debugging is even i start a new project that doesnt have any code in it and i place a break point it doesnt stop at it.Any idea?

Thank you.

Re: Break Point

Henry Minute21-May-09 6:44

Henry Minute

21-May-09 6:44

If your new project doesn't have any code, how do you set a breakpoint?

You can only set a breakpoint on a line of reachable code, without getting a warning.

Re: Break Point

kibromg21-May-09 6:48

kibromg

21-May-09 6:48

Thank you once again.I just declared a variable and assign a value to it.

Re: Break Point

OriginalGriff21-May-09 8:28

OriginalGriff

21-May-09 8:28

This may sound realy stupid, but are you actually debugging?
If you create a new (for example) console project, and enter a single line

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Demo
    {
    class Program
        {
        static void Main(string[] args)
            {
            int i = 1;
            }
         }
    }

Then click to the left of the line to create a breakpoint, does a red dot appear?
When you run it, how are you doing that? Try running it from the menu "Debug...Start debugging"
What happens when you start the program using "Debug...Step into"?

I apologise if this seems a little too simple and basic, but sometimes it is worth starting at the begining.

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

This message is made of fully recyclable Zeros and Ones

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.