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Hi all,
I am working Windows application. I have a requirement of downloading the files from a website.
When the application is runnning (downloading files), if user shutdown the
the system i need to cancel that shutdown and i have to display message like "Downloading files is not completed.You want stop Downloading files, if yes Click on btn_ShutDown ,if not btn_CancelShutDown.
For that i used Form1_Closing Event.
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (e.CloseReason.Equals(CloseReason.WindowsShutDown))
{
// I dont know the actual logic, but i tried the below one. But its not working
e.Cancel; // But its not working.
}
}
Please suggest me how to cancel the Shutdowning of system.
Thanks in advance.
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Thanks for your replay.
I already tried the logic present in the link
http://www.dotnetspider.com/resources/4541-Cancel-shutdown-e-computer.aspx[^]
But it's not worked.
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (e.CloseReason.Equals(CloseReason.WindowsShutDown))
{
Microsoft.VisualBasic.Interaction.Shell("shutdown -a", AppWinStyle.MinimizedFocus, false, -1);
MessageBox.Show("Shutdown process cancelled!");
}
}
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It doesnt' work because you cannot start new .EXE's while a shutdown is in progress and -a only aborts a PENDING shutdown, one which hasn't happened yet, so you're code is getting notified too late.
This[^] is how you really should do it. But, you really shouldn't be doing this at all.
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I dont know how to get the status of windows, if its shutting down, but u can use, i think, this code on if the user doesnt want to shutdown.
add this:
using System.Diagnostics;
// code for canceling the shutdown
Process.Start("shutdown -a");
// code for shutting down
Process.Start("shutdown -s");
//The process command is just like Start/Run 
I hope somebody helps you with "if shutting down"
Regards,
Matjaž
Força Barça!
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call "shutdown -a" after fetching the reason either using the System.Process namespace either using Microsoft.VisualBasic.Interaction.Shell to cancel the windows shutdown. Also if the user hits shutdown choosing to abort file download, run with one of the options specified above the following shell command: "shutdown -s" for shutdown or "shutdown -r" for restart or "shutdown -t [time_in_seconds] -[r or s] for a "timed" restart or shutdown.
Code? Yeah i love it fried together with a glass of wine.
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Exactly. For more information on the shutdown function, you can go Start/Run and open "cmd" and then type "shutdown /?".
Força Barça!
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Hi..all
I want to create an software using C# (Visual Studio 2005)
My app is expected to monitor the copy-paste file process that is doing by the current logged user.
I only want to get 2 main informations:
1. The address of the source file
2. The address of the destination file
For example, if the user copy file textX.txt from folder C:\Document to folder E:\Data , my application should catch : The source address as C:\Document\textX.txt and The destination address as E:\Data\textX.txt
I already used FileSystemWatcher, but it can catch the destionation address only. How can I get the source address as well?
Any solution would get my great appreciation.
Thanks.. 
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You can't use the FileSystemWatcher to do this. There's no event you can use either. This is something that you have to do by intercepting the calls bouncing around the Shell and/or I/O subsystem. Don't ask me how to do it, it have no idea. But that's the only place you can do this.
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Dave Kreskowiak wrote: something that you have to do by intercepting the calls bouncing around the Shell and/or I/O subsystem.
Oh boy, that sounds like a load of fun 
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
"Not only do you continue to babble nonsense, you can't even correctly remember the nonsense you babbled just minutes ago." - Rob Graham
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I for one have learned more in here than any book or school I have ever read or been to. I have MANY BOOKS.. Yes, this old man has two Masters degrees. Electronics and English (My language so I have cheated a bit). I had no money to do better!
I for one think you are ALL the greatest! Even the post I have downloaded that did not fit my needs at the time. I still learned something. Good AND bad.. Both helpful to my way of thinking.
I AM NOT a professional programmer or even try to make money doing it. I just code for FUN! AND ME!. I love to see what wokks in my programs and what does not. Both may be perfect code but not corect at what I am doing at the time.
I love to see if I can do better (as in most times make it less that what was posted)..
I thank you all for the knowledge..
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Yeah! CP rules! Lets party.  ![Beer | [beer]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/beer.gif)
Simon
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Yay! A party!!! Will there be any bourbon?
j.t.
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I have a class that when triggered downloads a file using the webclient class. The problem is my event AsyncCompletedEventHandler is never triggered when the file is finished downloading, never informing the user that the file is downloaded. Where did I go wrong?
public Download(string URL1, object send)
{
Sender = send;
Url = URL1;
WebClient client = new WebClient();
client.DownloadFileCompleted += new AsyncCompletedEventHandler(DownloadFileCallback2);
string[] s;
s = Url.Split(new Char[] { '/' });
string l;
System.Uri Uri = new System.Uri(Url);
l = @System.IO.Directory.GetCurrentDirectory();
l = @l + @"\" + s[3];
client.DownloadFileAsync(Uri, l);
}
public void DownloadFileCallback2(object send, AsyncCompletedEventArgs e)
{
//some code to inform user to run file or not...
}
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Try scoping the WebClient variable at the class level and then assigning the DownloadFileCompleted EventHandler on first use. I think that since client is scoped only in the method it will begin the Async operation and then exit the method and client will go out of scope.
WebClient client = null;
...
public Download(string URL1, object send)
{
...
if(client == null)
{
client = new WebClient();
client.DownloadFileCompleted += new AsyncCompletedEventHandler(DownloadFileCallback2);
}
Keep It Simple Stupid! (KISS)
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Hi Everybody!
I'm needing a software to rectify some images. I'm developing my thesis, however, despite the fact I have finished my project, my own software, I'm getting some errors because the images are not rectified.
My project is about a StereoVision, so from two images I have to process those images to get a 3D partial reconstruction. I have to give this project to my university this Thursday Nov 18th, so I'm getting desperated because I cannot get the results I was waiting for and it is because of that problem.
I will not use that code to add it to my project, I just need the software or application to rectify my two images.
If somebody have some information about where I can get this software or at least the code to compile, please help me!!
I'm needing it!!
Thanks a lot for your attention. I really appreciate it!
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ANd what do you mean by "rectification"?? That can mean anything...
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Image rectification is a transformation process used to project multiple images onto a common image surface. It is used to correct a distorted image into a standard coordinate system.
Stereo vision uses triangulation based on epipolar geometry to determine distance to an object.
Between two cameras there is a problem of finding a corresponding point viewed by one camera in the image of the other camera. (This is called the correspondence problem.) In most camera configurations, finding correspondences requires a search in two dimensions. However, if the two cameras are aligned to have a common image plane, the search is simplified to one dimension - a line that is parallel to the line between the cameras (the baseline). Image rectification is an equivalent (and more often used) alternative to this precise camera alignment. It transforms the images to make the epipolar lines (epipolar geometry) align horizontally (Oram 2001).
If the images to be rectified are taken from camera pairs without geometric distortion, this calculation can easily be made with a linear transformation. X & Y rotation puts the images on the same plane, scaling makes the image frames be the same size and Z rotation & skew adjustments make the image pixel rows directly line up. The rigid alignment of the cameras needs to be known (by calibration) and the calibration coefficients are used by the transform (Fusiello 2000).
In performing the transform, if the cameras themselves are calibrated for internal parameters, an essential matrix relates the relationship between the cameras. The more general case (without camera calibration) is represented by the fundamental matrix. If the fundamental matrix is not known, it is necessary to find preliminary point correspondences between stereo images to facilitate its extraction (Fusiello 2000).
Stereo images can also be taken with a single camera in motion. In this case the relationship of the images can have significant forward-motion components, and a linear transformation may produce severely warped images or very large images. Non-linear transformation techniques can be used to manage this difficulty (Oram 2001).
THIS DEFINITION WAS TAKEN FROM WIKIPEDIA at: http://en.wikipedia.org/wiki/Image_rectification[^]
It is a simple but very good definition about it!
Thanks!
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I'm trying to kill some old and very bad habits and i would need some advice.
In my current project i am making a fluid dynamics simulator and i have a few big datasets.
All of the datasets are arrays containing around 50-100k objects.
There's a lot of code influencing the data so i prefer to structure it by calling functions that do specific things to the data, each function requires knowledge about most if not all datasets to do its calculation.
As things currently are the datasets are global variables that each function directly interacts with.
Being reminded that global variables are evil i want to remove them but i meet obstacles what ever i do.
If i don't keep the datasets as global i lose the data when the "Update" finishes.
If i do the calculations on a local dataset inside of Update i have no where to send the data for safe keeping because there are no global variables and once "Update" finishes its cycle everything inside it is purged.
I can't send the dataset to the next Update because because the Update call is done somewhere in the background.
I could write the datasets to the harddrive and then fetch it the next cycle but that seems awfully inefficient.
Maybe XNA is unique in this aspect but don't you have to use some kind of global variable in ordinary programming no matter what you do in order to keep the data persistent?
Confused
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I've never used XNA (yet!) but in general - the singleton pattern is the normal answer to this. Loads of info on here and google about it.
DaveBTW, 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)
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I'm from a VB background where weaning off globals is almost essential, however I think there are some cases where a global (static class in C# I presume) is valid and this certainly sounds like one, how else are you to persist your data between functions?
Never underestimate the power of human stupidity
RAH
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One of the reasons why global variables are bad is because everything in the program has access to them.
While reading up on singletons there seem to be just as many threads with the subject "Singletons are evil" as there are "Global Variables are evil".
How should i interpret what seems to be a bias against any and all sorts of persistent data?
How do people usually fix things like...
1: "Shopping cart" in webapplications, everything doesn't need to have access to the shopping cart but unless you store the shopping cart as a global or singleton(static class) you're going to lose whatever was in it.
2: Texture storage in games, same problem here, the sound manager for example doesn't need access to the textures, but unless you store the textures somewhere in the higher scope you're going to lose it all when the sound manager starts.
Still confused
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Hi,
I have a DGV that load´s a table from a xml file, but after i make changes i can´t save them, see bellow. Help me debug this
Class_Helper.DataSet_Xml = new DataSet();
Class_Helper.Assembly_This = Assembly.GetExecutingAssembly();
Class_Helper.Stream_Resource = Class_Helper.Assembly_This.GetManifestResourceStream(Class_Helper.ResourceXml_login);
Class_Helper.DataSet_Xml.ReadXml(Class_Helper.Stream_Resource);
DataRow DataRow_user = Class_Helper.DataSet_Xml.Tables[0].NewRow();
DataRow_user["id"] = 10;
DataRow_user["f_name"] = ToolStripTextBox_FName.Text;
DataRow_user["l_name"] = ToolStripTextBox_LName.Text;
DataRow_user["username"] = ToolStripTextBox_Username.Text;
DataRow_user["password"] = ToolStripTextBox_Password.Text;
DataRow_user["role"] = ToolStripComboBox_Role.Text;
Class_Helper.DataSet_Xml.Tables[0].Rows.Add(DataRow_user);
DataGridView_Administrator.DataSource = Class_Helper.DataSet_Xml.Tables[0];
Class_Helper.DataSet_Xml.WriteXml(Class_Helper.ResourceXml_login, XmlWriteMode.WriteSchema);
Thanks
nelsonpaixao@yahoo.com.br
trying to help & get help
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