C# Discussion Boards - CodeProject

Re: FileSystemWatcher how to wait for file copy completion?

Dave Kreskowiak7-Feb-11 6:28

7-Feb-11 6:28

Just to be clear, there is no "completion event". The FSW tells you when a file is CREATED, not when a copy operation is going on.

A file copy operation is just an application (Explorer) opening one file for read and another file for write. Read the bytes from one file and write them to another.

The FSW cannot tell what is going on with the files.

But, yeah, your code has to respond to the Created event from the FSW, then start trying to open the file for read with exclusive access (ShareDenyAll). If the open statement fails, wait for a few seconds, then try it again. When you finally get the file open, your copy operation should be done. Close the file and process to do whatever you wanted with the file.

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Dave Kreskowiak

Problem by using an Object and a variable inside another function [modified]

nstk7-Feb-11 2:59

nstk

7-Feb-11 2:59

Hello,

trying to build a Windows programm, I 've declared an object in Fornm1.cs by typing

Person[] P = new Person[10];

after a class Person I 've created on another file called Person.cs

Then on the function that is being activated after clicking on a button inside the Form I pass simple numerical values to a member attribute like below:

private void btnObjectAdd_Click(object sender, EventArgs e)
{
    lbltest_i.Text = i.ToString();
    P[i] = new Person();
    P[i].category = i;
    i++;
    if (i == 10)
    {
        for (i = 0; i < 10; i++)
            P[i] = null;
            i = 0;
    }
 }

Thus I get P[0]=0, P[1]=1, ... P[9]=9.

Then I try to call a value of an object on another function like

    private void showToolStripMenuItem_Click(object sender, EventArgs e)
{
   int value = P[2].category;
}

and I get value = 2.

This works perfect.

But if I change

int value = P[2].category;

into

int value = P[i].category;

then I get an error that I should create an object with 'new'.

Variable i is declared as

int i = 0;

outside the functions but inside the
public partial class Form1 : Form

Is that the problem?

modified on Monday, February 7, 2011 1:14 PM

Re: Problem by using an Object and a variable inside another function

musefan7-Feb-11 3:15

musefan

7-Feb-11 3:15

There seems to be something very wrong with your design. But if "i" is declared in the same class as your showToolStripMenuItem_Click code then there should be no reason why that is the problem. Perhaps you need to post more of your code - and please you the PRE tags to format is more readably.

return 5;

Re: Problem by using an Object and a variable inside another function

nstk7-Feb-11 7:19

nstk

7-Feb-11 7:19

Thanks for the 'pre' tip, i was looking for s'thing like that.

I got rid of the confusing 0 by changing the array into

new Person[11]

instead of a 10 dimension. After all, we 've got plenty of memory nowdays $Shucks | :-\$

As a result everything worked fine! It must have been some other mistake, as the one I thought of.

dynamic way to analyse settings

arkiboys7-Feb-11 2:55

arkiboys

7-Feb-11 2:55

How is it possible to make a dynamic system so that everytime a new setting is added to the app.config file, the system can take that into consideration?
For example, my present system, looks in the app.config file and gets the value of a key i.e.

<add key="AllowedTime" value="5"/>
<add key="MyValue" value="10"/>

and the system does checks based on this figures. For example if the retrieved value i.e. 5 is less than the MyValue in the app.config file...

I can go on and add more settings in the app.config file and add the logic to the c# code, but I wonder if there is a generic way so that as long as the setting is entered in such a manor so that the c# code can analyse that without me adding to the c# code each time there is a new setting in the config file.?
What do you think?
Thanks

Re: dynamic way to analyse settings

musefan7-Feb-11 3:08

musefan

7-Feb-11 3:08

Just a quick thought. There may be built in functionality for this kind of thing I don't know of...

<add key="NumberOfValues" value="3"/>
<add key="MyValue1" value="1"/>
<add key="MyValue2" value="2"/>
<add key="MyValue3" value="3"/>

Then in code...

int count = int.Parse(ConfigurationManager.AppSettings["NumberOfValues"]);
for(int i = 1; i <= count; i++)
{
   string setting = ConfigurationManager.AppSettings["MyValue" + i];
//do something with setting value
}

...of course, it depends what you actually plan on doing with these kind of values. I have not needed this functionality before and I imagine the closest thing I would need would probably result in me creating an XML file of some sort

return 5;

Re: dynamic way to analyse settings

#realJSOP7-Feb-11 3:42

#realJSOP

7-Feb-11 3:42

Before doing anything with the settings, you can call the Load() method on the settings object to make sure you're using the latest settings, or you can setup a thread that watches the file, and reloads it when the file changes, or even setuup a thread that loads it every X minutes.

".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997

messenger

om_metab7-Feb-11 1:19

om_metab

7-Feb-11 1:19

how to create own DB emails to used in own messenger