Indeed, MSMQ is very large an does have a lot of overhead.
If you need a queueing system, I propose the following:
Have a class that has an int to record the number of items currently
being downloaded.
Have a generic queue as mentioned in the previous post.
Have an Int16 that records the max number of items to be downloaded at
once.
Have a method that checks for the number running and if it is then
than the max and the queue has items, call the start running method.
THis should be called every time something is added to the queue.
Have a start running method that increments the number running and
then does the download, then removes the item from the queues and once
doen, decrements the number running. This must then call the previous
method again.
Have a method that allows item to be added to the queue. This should
call the checking method. This should be the only public method.
Try that out.
On 4 Sep, 16:18, Joeizy <[EMAIL PROTECTED]> wrote:
> Just a side note... MSMQ is just a queueing construct supported by the
> OS instead of you application. MSMQ can also be accessed by multiple
> applications. One more benefit is that the items in a MSMQ queue will
> be preserved if you application closes and reopens. A major downfall
> could be that the some computer must be running the MSMQ service,
> either the computer that your application is running on (this requires
> your user setting up their computer) or you must have a server running
> MSMQ.
>
> I don't believe you need all of these extra benefits or overhead.
> Instead you could use a System.Collections.Generic.Queue<T> (http://
> msdn.microsoft.com/en-us/library/7977ey2c.aspx). This provides the
> same FIFO functionality without having to go outside of your
> application.
>
> On Sep 4, 2:48 am, CK <[EMAIL PROTECTED]> wrote:
>
>
>
> > The efficieny depends on many factors - the size of your internet
> > pipe, the size of the galleries etc.
>
> > MSMQ will allow a First In First Out (FIFO) mechanism for processing
> > your queue.
>
> > Basically there are a million ways you can do this, try some out and
> > come back if you have any issues.
>
> > Thanks,
>
> > Chris
>
> > On 2 Sep, 11:52, Mark <[EMAIL PROTECTED]> wrote:
>
> > > The user doesn't actually enter URLs of photos, but URLs of galleries
> > > (or series of galleries)...and it's takes half a second to add them
> > > (designed for ease of use)... so...the queue can get very large, very
> > > fast. I know the code won't impose any limits on how many can be
> > > asynchronously downloaded, but my question was more "is it efficient?"
> > > -- ie, is it more efficient to download 10 photos, 2 at a time, or all
> > > 10 photos at once? Maybe 2 at a time will achieve higher download
> > > speeds and finish earlier? I assume IE and other browsers/programs
> > > impose these limits for a reason.
>
> > > No, I havent looked into MSMQ, I'll have a look at that later. Thanks!
>
> > > On Sep 2, 1:06 am, CK <[EMAIL PROTECTED]> wrote:
>
> > > > there is a limit in Internet Explorer, but using code you shouldn't
> > > > have an issue. How quickly will users be able to enter a new url
> > > > compared to how quickly the pictures are downloaded?
>
> > > > Have you looked into MSMQ - Microsoft Message Queue?
>
> > > > On 1 Sep, 09:58, Mark <[EMAIL PROTECTED]> wrote:
>
> > > > > Isn't there a cap on how many images you can download at once? Most
> > > > > downloader/uploader programs only download/upload 2-8 files at a
> > > > > time...any more than that is inefficient/eats all your bandwidth, no?
> > > > > I would like to DL about 8 at a time, and queue the rest...
>
> > > > > On Aug 20, 12:40 am, CK <[EMAIL PROTECTED]> wrote:
>
> > > > > > Why build a listbox full of the items?
>
> > > > > > I would write my method for downloading the images, then create a
> > > > > > delegate with a matching signature. Every time the user enters text
> > > > > > and clicks the button, call the delegate asynchronously, passing in
> > > > > > the string. This means each image will be downloaded asynchronously
> > > > > > with no queuing mechanism required.
>
> > > > > > On 19 Aug, 23:50, Mark <[EMAIL PROTECTED]> wrote:
>
> > > > > > > I'm making a Windows Forms Application. It contains a ListView, a
> > > > > > > TextBox and a Button. The user can type some stuff in the TextBox,
> > > > > > > click the Button, and it will be added to the ListView. I want to
> > > > > > > process the items in the ListView and then pop them off list,
> > > > > > > using a
> > > > > > > separate thread, so that the program doesn't hang and the user
> > > > > > > can add
> > > > > > > more items while it's running. With what I have right now, I can't
> > > > > > > remove items from the list from a different thread. I understand
> > > > > > > why
> > > > > > > this causes problems, but I'm not sure how to fix it. I've tried
> > > > > > > following a few tutorials to use delegates, but I can't seem to
> > > > > > > get it
> > > > > > > to work. Here's what I've got right now:
>
> > > > > > > using System;
> > > > > > > using System.Collections.Generic;
> > > > > > > using System.ComponentModel;
> > > > > > > using System.Data;
> > > > > > > using System.Drawing;
> > > > > > > using System.Text;
> > > > > > > using System.Windows.Forms;
> > > > > > > using System.Text.RegularExpressions;
> > > > > > > using System.Threading;
>
> > > > > > > namespace ImageDownloader
> > > > > > > {
> > > > > > > public partial class Form1 : Form
> > > > > > > {
> > > > > > > public Form1()
> > > > > > > {
> > > > > > > InitializeComponent();
> > > > > > > }
>
> > > > > > > private void Download()
> > > > > > > {
> > > > > > > while (true)
> > > > > > > {
> > > > > > > if (listView1.Items.Count > 0)
> > > > > > > {
> > > > > > > listView1.Items.RemoveAt(0);
> > > > > > > }
> > > > > > > }
> > > > > > > }
>
> > > > > > > private void button1_Click(object sender, EventArgs e)
> > > > > > > {
> > > > > > > listView1.Items.Add(textBox1.Text);
> > > > > > > textBox1.Text = "";
> > > > > > > }
>
> > > > > > > private void Form1_Load(object sender, EventArgs e)
> > > > > > > {
> > > > > > > Thread t = new Thread(new ThreadStart(Download));
> > > > > > > t.Start();
> > > > > > > }
> > > > > > > }
>
> > > > > > > }
>
> > > > > > > This theoretically should just remove all the items from the list
> > > > > > > as
> > > > > > > soon as they are added, one by one. Obviously I'll do some
> > > > > > > processing
> > > > > > > on each item first, but I need to get this working before I get
> > > > > > > into
> > > > > > > that :)
>
> > > > > > > Thanks for any help.- Hide quoted text -
>
> > > > > - Show quoted text -- Hide quoted text -
>
> > > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -
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