Is it possible to break at runtime when a particular file has been modified?
ie. monitor the file and break into a debugger once a change has been made to it.
This is for a windows app...is this possible in visual studio or windbg?
edit: i should have mentioned that this is for a Win32 app..
you can use the System.IO.FileSystemWatcher class.
FileSystemWatcher watcher = = new FileSystemWatcher();
watcher.Filter = #"myFile.ini";
watcher.Changed += new FileSystemEventHandler(watcher_Changed);
and then you implement the delegate of type FileSystemEventHandler:
static void watcher_Changed(object sender, FileSystemArgs e)
{
Console.WriteLine("File {0} has changed.", e.FullPath );
}
every time the file you have selected in the filter is modified, you get an alert (you can use both a Debug class or Trace class to output data).
Moreover the FileSystemWatcher class has more events (Renamed, Deleted, Created).
Assuming this is .NET, the System.IO.FileSystemWatcher class is what you need.
FileSystemWatcher watcher = new FileSystemWatcher("c:filename.txt");
watcher.Changed += new FileSystemEventHandler(watcher_Changed);
//
void watcher_Changed(object sender, FileSystemEventArgs e)
{
// put a breakpoint here
}
Related
I am trying to get my console application to simulate dragging and dropping a file, so far I have had no luck.
The system throws a win32 exception stating it cannot find the file, since I know that is not really the problem I was hoping someone could shed some light on what might be causing this behavior.
I suspect it might be DEP. I can drag and drop the file and the process runs as expected, but I need to automate this.
I have created a filewatcher and am right now trying to figure out how to get the code to work, prior to making it a windows service.
But right now I am really stuck on this win32 error.
public class Watcher
{
public static void Main(string[] args)
{
Run();
}
[PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
public static void Run()
{
string[] args = System.Environment.GetCommandLineArgs();
// If a directory is not specified, exit program.
if (args.Length != 2)
{
// Display the proper way to call the program.
Console.WriteLine("Usage: Watcher.exe (directory)");
return;
}
// Create a new FileSystemWatcher and set its properties.
FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = args[1];
/* Watch for changes in LastAccess and LastWrite times, and
the renaming of files or directories. */
watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
| NotifyFilters.FileName | NotifyFilters.DirectoryName;
// Only watch jpg files.
watcher.Filter = "*.jpg";
// Add event handlers.
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Created += new FileSystemEventHandler(OnChanged);
watcher.Deleted += new FileSystemEventHandler(OnChanged);
watcher.Renamed += new RenamedEventHandler(OnRenamed);
// Begin watching.
watcher.EnableRaisingEvents = true;
// Wait for the user to quit the program.
Console.WriteLine("Press \'q\' to quit the sample.");
while (Console.Read() != 'q') ;
}
// Define the event handlers.
private static void OnChanged(object source, FileSystemEventArgs e)
{
// Specify what is done when a file is changed, created, or deleted.
Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
Process.Start(e.FullPath + "c:\\demo\\kr-pano\\mpr.bat");
}
Visit the link to see the full win32 exception details.
Win32Exception
Apparently the issue is being caused because the filesystemwatcher is single threaded, and when I try to launch my new process it stops the old one from running. All I needed to do was stub out a new runpano function and call it from my code, its working now.
I have a large proces that I need to debug and the proces could stop at anytime. I have configured Visual Studio 2017, to stop at any thrown exception, as in, even if it is handled, because I want to see what caused the exception. What I need is some sort of alarm when this happens, so that I can leave the program to run and then alert me if anything comes up. The only thing I have found is an alarm sound when a break point is hit, but it might not be a break point and I need more than a sound, I need to be able to execute some code, so that I can make my Phone go nuts or whatever. Is there any way I can trigger code when the debugger enters break mode?
Thanks in advance.
It is, using a VS package. You'll need to add this attribute on top of the class in order for code to run on package startup:
[ProvideAutoLoad(Microsoft.VisualStudio.Shell.Interop.UIContextGuids80.SolutionExists)] ///Able to run code on solution startup
Add these class values variables:
private DTE2 applicationObject;
private BuildEvents buildEvents;
private DebuggerEvents debugEvents;
then the following code can run:
protected override void Initialize()
{
base.Initialize();
applicationObject = (DTE2)GetService(typeof(DTE));
buildEvents = applicationObject.Events.BuildEvents;
debugEvents = applicationObject.Events.DebuggerEvents;
SetupEventHandlers();
}
And finally the code we have "all" being waiting for:
private void SetupEventHandlers()
{
//buildEvents.OnBuildDone += (scope, action) =>
//{
//};
debugEvents.OnEnterBreakMode += delegate (dbgEventReason reason, ref dbgExecutionAction action)
{
};
//var componentModel =
// GetGlobalService(typeof(SComponentModel)) as IComponentModel;
//if (componentModel == null)
//{
// Debug.WriteLine("componentModel is null");
// return;
//}
//var operationState = componentModel.GetService<IOperationState>();
//operationState.StateChanged += OperationStateOnStateChanged;
}
I cannot seem to find a good solution for this issue online. I have a device that is running Windows Embedded Handheld 6.5. I run the solution located at below
C:\Program Files (x86)\Windows Mobile 6.5.3 DTK\Samples\PocketPC\CS\GPS
I deploy the code to my device, not an emulator, and the code breaks with a null reference exception at
Invoke(updateDataHandler);
The solution ive seen recommends changing this to below
BeginInvoke(updateDataHandler);
But now the code breaks at Main with NullRefreceException.
Application.Run(new Form1());
Has anyone found a solution for this?
Did you alter the code? updateDataHandler is initialized in Form_Load:
private void Form1_Load(object sender, System.EventArgs e)
{
updateDataHandler = new EventHandler(UpdateData);
so that object will not be NULL. But there are other annoyances with the code, especially the Samples.Location class. You may instead use http://www.hjgode.de/wp/2010/06/11/enhanced-gps-sample-update/ as a starting point and the older one: http://www.hjgode.de/wp/2009/05/12/enhanced-gps-sampe/
The main issue with the sample is that it does not use a callback (delegate) to update the UI. If an event handler is fired from a background thread, the handler can not directly update the UI. Here is what I always use to update the UI from a handler:
delegate void SetTextCallback(string text);
public void addLog(string text)
{
// InvokeRequired required compares the thread ID of the
// calling thread to the thread ID of the creating thread.
// If these threads are different, it returns true.
if (this.txtLog.InvokeRequired)
{
SetTextCallback d = new SetTextCallback(addLog);
this.Invoke(d, new object[] { text });
}
else
{
txtLog.Text += text + "\r\n";
}
}
I have searched numerous articles and tried several different ways of solving this issue.
Note that this process works fine in a Console app or a Windows app with the exact same code. So, there's nothing wrong with the logic. It's the way the Windows Service is processing these files that is somehow not letting subsequent files get through.
I tried reading a simple article to actually debug the service, but I don't have the "Attach To Process" selection under my Debug menu using Visual Studio 2010.
http://msdn.microsoft.com/en-us/library/7a50syb3(v=vs.100).aspx
I really need some help here, because my options have really run out.
Here is the simple scenario:
I have a FileSystemWatcher in the OnStart method that kicks off another method to process a file on my local machine. These are just simple txt files. When the first file is processed, everything is normal and I get the following in my Event log:
Data successfully inserted for file 20121212_AZM_Journey_MIS.txt
When I try and process subsequent files (exact same format, but a different name --- with the date), I get the following in my Event log:
The process cannot access the file 'C:\Projects\Data\VendingStats\20121213_AZM_Journey_MIS.txt' because it is being used by another process.
Note that the files are watched for in this same directory when created.
Here is my code in my Windows Service. Can someone please let me know how I can solve this issue? Note that e.FullPath evaluates to "C:\Projects\Data\VendingStats" on my local machine.
public partial class VendingStatsService : ServiceBase
{
public VendingStatsService()
{
InitializeComponent();
}
protected override void OnStart(string[] args)
{
FileSystemWatcher Watcher = new FileSystemWatcher(#"C:\Projects\Data\VendingStats");
Watcher.EnableRaisingEvents = true;
Watcher.Created += new FileSystemEventHandler(**Watcher_Created**);
Watcher.Filter = "*.txt";
Watcher.IncludeSubdirectories = false;
}
private void Watcher_Created(object sender, FileSystemEventArgs e)
{
try
{
using (TextReader tr = new StreamReader(e.FullPath))
{
// code here to insert data from file into a DB
}
Dispose();
}
catch (Exception ex)
{
EventLog.WriteEntry("VendorStats", "Error in the Main:" + "\r\n\r\n" + ex.Message + "\r\n\r\n" + ex.InnerException);
return;
}
}
public void Dispose()
{
GC.Collect();
}
I think the title or the question is clear enough. I saw something about the EventSink, but I found it difficult to use. Any hint?
The Visio Primary Interop Assembly exposes these events as C# events therefore you can simply hook the event with a delegate.
See this simple example:
namespace VisioEventsExample
{
using System;
using Microsoft.Office.Interop.Visio;
class Program
{
public static void Main(string[] args)
{
Application app = new Application();
Document doc = app.Documents.Add("");
Page page = doc.Pages[1];
// Setup event handles for the events you are intrested in.
// Shape deleted is easy.
page.BeforeShapeDelete +=
new EPage_BeforeShapeDeleteEventHandler(onBeforeShapeDelete);
// To find out if a shape has moved hook the cell changed event
// and then check to see if PinX or PinY changed.
page.CellChanged +=
new EPage_CellChangedEventHandler(onCellChanged);
// In C# 4 for you can simply do this:
//
// page.BeforeShapeDelete += onBeforeShapeDelete;
// page.CellChanged += onCellChanged;
// Now wait for the events.
Console.WriteLine("Wait for events. Press any key to stop.");
Console.ReadKey();
}
// This will be called when a shape sheet cell for a
// shape on the page is changed. To know if the shape
// was moved see of the pin was changed. This will
// fire twice if the shape is moved horizontally and
// vertically.
private static void onCellChanged(Cell cell)
{
if (cell.Name == "PinX" || cell.Name == "PinY")
{
Console.WriteLine(
string.Format("Shape {0} moved", cell.Shape.Name));
}
}
// This will be called when a shape is deleted from the page.
private static void onBeforeShapeDelete(Shape shape)
{
Console.WriteLine(string.Format("Shape deleted {0}", shape.Name));
}
}
}
If you haven't already downloaded the Visio SDK you should do so. Recent versions of the SDK it contains many useful examples include one called "Shape Add\Delete Event". If you have the 2010 version can browse the examples by going to Start Menu\Programs\Microsoft Office 2010 Developer Resources\Microsoft Visio 2010 SDK\Microsoft Visio Code Samples Library.
I believe that you have to implement EvenSink to get access to "ShapesDeleted", i.e.
(short)Microsoft.Office.Interop.Visio.VisEventCodes.visEvtCodeShapeDelete
the code above will help you if you are looking for the event "BeforeShapeDelete" not the "after"ShapeDelete ;)