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Thanx a lot. That was very helpfull
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What is the best way to avoid connection, or thread pool limitations for my application? And am I doing it correctly?
I'm designing my own chat. It's necessary because my design is very different from any available out there. Because of the new security features in IE I can't use a different server than my website server for processing chat requests. I'm forced to combine my web app with my chat server.
So, my plan was to use ajax to make a page request. The page would then use asp.net 2.0's asynchronous pages feature to start a new thread and release the Thread that processes page requests. Then my plan was to have the thread wait until a new message comes in if I have no messages to send to the client immediately.
My two main uncertainties are this:
1) How do I best wait for new messages? Should I use a wait and notify? Should I use a WaitHandle(never used it before). Will I run out of threads in the thread pool from using these methods because they block? Is there a way to wait and release the threads at the same time?
2) Is there a limit on the number of connections that can be made to a web server. I want every client on my website to be able to receive notifications of new chat messages immediately, without polling. So, am I doing it right or should I use some sort of callback method that doesn't keep a connection open. is that possible???
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I am trying to start an instance of an Outlook mail message with a few files attached, and am having some difficulty. I have about googled my fingers off to no avail...
The code I have currently will work for only 1 attachment:
System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo("OUTLOOK.exe");
psi.Arguments = "/a \"c:\\myfile.txt\"" ;
System.Diagnostics.Process.Start(psi);
I have tried specifying multiple /a command line switches to get multiple files attached such as /a "file 1" /a "file 2" , and I have tried arguments /a "file 1" "file 2" as well. I have had no luck with either approach.
Does anyone know of a way to specify multiple attachments through a command line argument?
Thanks for your help.
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After doing more research, it seems that the only way to accomplish this is through the user of Interop libraries. This link[^] may be of use to others who are trying to solve the same problem that I was.
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I need to serialize some class using XmlSerializer and write them to file. How can I do so if I want to use the same file and append more objects to it? For example, if I want to save Student records to xml file, first I will use the XmlSerializer to serialize the Student object. Then I can write it to a file called Students.Xml. If I want to write more students to the same file how can I append it to the existing file? The XmlSerializer adds extra elements which I do not need on every successive record. It adds tags like <student xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" datetimevalue="2008-09-24">
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Did you try passing the same Stream or TextReader instance so it just appends students to it?
Stream s = File.OpenWrite("<filepath>");
foreach (Student student in studentList)
{
xmlSerializer.Serialize(s, student);
}
s.Flush();
s.Close();
</filepath>
I never tried it, just throwing an idea.
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Le,
Thanks but no luck it still appends all the extra tags which I do no want to be repeated. This is because as soon as you call serialize the elements are created first then written.
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The way I do this is to use a class that inherits from List<student>
public class StudentCollection : List<student>
{
}
public static List<student> DeSerialize()
{
}
and serialize the collection. If I add a student, I use my own add method and call Serialize afterwards.
public new void Add(Student student)
{
base.Add(student);
Serialize(this);
}
public static void Serialize(List<student> studentCollection)
{
}
It may not be the quickest or best way(?) but it works for me. I always prefer to deal with collections than trying to manipulate a lot of individual objects myself.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Expect everything to be hard and then enjoy the things that come easy. (code-frog)
modified on Wednesday, September 24, 2008 2:01 PM
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That is exactly how I have it but here is the problem:
The user starts the application creates a few students--which I add to the collection--then presses save. Save takes the collection and serializes it and writes to the file. Here is the where I have difficulty: If the user shuts down the application and starts another instance and creates more records and presses save, how can I append the serialized collection to the file which already has some records in it. One solution is to deserialize all students from file into a collection, add new students to collection and reserialize them but that can become very slow if I have a lot of records in the file.
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CodingYoshi wrote: deserialize all students from file into a collection, add new students to collection and reserialize
That's exactly what I do. It's not become a problem yet. I use binary serialization - I don't know if that's quicker or not. I can imagine on a very large collection it could be slow - or worse still with many instances possibly wanting to deserialize and serialize, actually being able to get access to the file could be an issue.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Expect everything to be hard and then enjoy the things that come easy. (code-frog)
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You can append another serialized collection to the end of a file.
Just seek to the end of a file stream before serializing another
collection to the stream.
Of course, when you read it in you'll need to loop through all the collections.
Flat file databases get inefficient pretty quickly...
This is why relational databases were invented
Mark Salsbery
Microsoft MVP - Visual C++
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When using an XML file that way, I suggest you use an XmlDocument instead.
When the program starts, you can read the file into the XmlDocument and then you can save it after each modification.
As far I can tell, XML serialization is best for passing things around, like to and from Web Services, not for persisting to a file.
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how can i save the images,circles,rectangle,lines or etc together..
if somebody knows it then plz explain me with some code...
i konw that image can be save via one of the Bitmap's method
i.e:
imageObj.Save(fileName);
but i want to save not only images , whole it(e.g: circles,rectangles,lines which a user is drawn on it) not a just an image.
plz dont send the source of anyother site because i m new commer
hghghgh
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If someone knows the answer, they would answer your first post. Posting again isn't going to make things any better.
Why is common sense not common?
Never argue with an idiot. They will drag you down to their level where they are an expert.
Sometimes it takes a lot of work to be lazy
Individuality is fine, as long as we do it together - F. Burns
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yes i made a mistake but what should i do, when nobody anser me..
hghghgh
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The first thing to remember is that no one here is a professional answer person. We do it to help each other. If you are not getting an answer, we don't know or can't figure out what you are trying to do.
Try google for an answer to your situation. Many times a simple google search will get you an answer faster than posting on a forum.
Try re-stating what you are trying to do in plain simple english.
Include what you have tried to do that did not work.
Patience.
Why is common sense not common?
Never argue with an idiot. They will drag you down to their level where they are an expert.
Sometimes it takes a lot of work to be lazy
Individuality is fine, as long as we do it together - F. Burns
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Sorry..........
i am making an image editor .....
this image editor can draw circle,rectangles and images....
the problem is that i am facing i want to save it..
hghghgh
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I can't clearly understand what you're looking for but I think you should know what you want to save. For example if you want to save a rectangle properties you have to save it's location, size, color,... in a database (file, sql,...) and load them when user executes your application.
But if you explain some more, I think we can help you better.
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The normal mechanism for performing this is to make each image item an object in its own right, possibly inheriting from a common base class, and then each item is responsible for writing the information to the serialization stream under the control of some form of "canvas". Typically, your base class might look like this:
public abstract class ImageBase
{
public int X { get; set; }
public int Y { get; set; }
public int Width { get; set; }
public int Height { get; set; }
public virtual ImageBase Save()
{
}
public virtual void Load( item)
{
}
}
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Guys,
I send to a webservice a gift message string which can be any length. That service splits the string into 30 characters and creates a new line.
example:
I type:
Hi Jocey!! I Hope you have a stupendous 30th birthday! I'm aorry I can't make it! Suexoxo
The web service splits as follows:
Hi Jocey!! I Hope you have a s
tupendous 30th birthday! I'm s
orry I can't make it! Suexoxo
My question is, can we do something like this, if the break happens to be in a word like S orry can we fill up with spaces and send that sorry next line. I am unclear please follow up. may be some regular expression?
Thank you very much for your help guys!
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Yes you can. Find all instances of the space character in your long string. Then only send strings based on the space not based on the character position. You can then add padding to the end if necessary.
Need software developed? Offering C# development all over the United States, ERL GLOBAL, Inc is the only call you will have to make.
Happiness in intelligent people is the rarest thing I know. -- Ernest Hemingway
Most of this sig is for Google, not ego.
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Use the LastIndexOf method to find the last space within the first 30 characters and split the string there. Use the PadRight method to add spaces.
Example:
string msg = "Hi Jocey!! I Hope you have a stupendous 30th birthday! I'm aorry I can't make it! Suexoxo";
List<string> lines = new List<string>();
while (msg.Length > 30) {
int pos = msg.LastIndexOf(' ', 29, 30);
if (pos != -1) {
lines.Add(msg.Substring(0, pos).PadRight(30));
msg = msg.Substring(pos + 1);
} else {
lines.Add(msg.Substring(0, 30));
msg = msg.Substring(30);
}
}
lines.Add(msg.PadRight(30));
foreach (string s in lines) Console.WriteLine("\""+s+"\"");</string></string>
Despite everything, the person most likely to be fooling you next is yourself.
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your anser works like a miracle. one more question for you. how can I clean up the text from carriage returns and line feeds? before starting the process?
please advice.
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I suppose that you want spaces in place of the line breaks?
msg = msg.Replace("\r\n", " ");
Despite everything, the person most likely to be fooling you next is yourself.
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