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One way to do this is to have a series of catch blocks.
try
{
Object obj = entry.NativeObject;
}
catch (System.UnauthorizedAccessException e)
{
MethodToDealWithThisTypeOfError(aParameterFromEventArgs, anotherParameter);
return false;
}
catch (System.DivideByZeroError e)
{
MethodToDealWithThisTypeOfError(aParameterFromEventArgs, anotherParameter);
return false;
}
finally
{
MeassageBox.Show("This happens regardless of errors", Application.ProductName);
}
and so on.
[Edit]
Here is a reasonable article[^]
[/Edit]
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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Hi,
I am able to extract the text from the PDF file using the PDFStripper, but I would like to read the Table of content of the PDF document. How can I do that? How do I know the Page I am reading is Table of Contents? and also how to differentiate the Chapter heading and the subsection of chapter of the Table of Content?
Any help in this is highly appreciated.
Thanks
Neil
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Your best source of information is the people who wrote PDFStripper, but I think some of this would be subject to how the PDF is organized and written.
If PDFStripper doesn't provide any data to differentiate this, you'd have to implement logic (probably fuzzy) to try and analyze a page to see if it MAY be a TOC. The problem would be determining where the TOC ends.
You've got the same problem for the other parts of the document you want to pull out.
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Hi there,
in an application which I developed on a Windows XP computer in Visual Studio 2005 Express with C#, I set a tooltip in a MouseMove event of a panel. On that environment, everything looks fine.
Then I loaded the source code on a Windows 7 64 bit computer in Visual Studio 2005 Professional, started the application, and found that the tooltip was terribly flickering, even when I did not move the mouse.
I added variables for storing the last mouse position, and in the MouseMove event I leave now the function when the position has not changed. Now the tooltip looks fine on Win7 also.
For debugging purposes, I set a break point on that return statement, I really get there...
I.e. a MouseMove event is fired though the mouse is not moving.
What are your experiences with MouseMove and tooltips with respect to Windows 7? Looking forward to your statement.
Regards,
Bernhard
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I just had the exact same experience with tooltip flickering inside of a DataGridView. This flicker was also found only on Windows 7 and not on XP and was caused by the MouseMove event firing repeatedly in Windows 7 when the mouse is not moving.
For now I have applied your same fix. If I find the underlying cause I will try to follow up.
Jason
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Thanks it helped me too 
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hi, I'm using the below code for my client/server application.The question is, it creates a new connection each time it triggered by the timer and the number of sockets in the arraylist(alSockets) increases. What is the ideal way?
if you don't mind, I have another question;
if a client is sending two requests, server has to reply those two requests. If server replies only one instead of two, an exception is thrown. Sometimes I may need to send three requests, how can I prepare the server so that no exception is thrown
public void listenerThread()
{
IPHost = Dns.GetHostEntry(Dns.GetHostName());
TcpListener tcpListener = new TcpListener(IPHost.AddressList[0], 8080);
tcpListener.Start();
while (true)
{
Socket listenerSocket = tcpListener.AcceptSocket();
if (listenerSocket.Connected)
{
lock (this)
{
alSockets.Add(listenerSocket);
}
Thread thdHandler = new Thread(new ThreadStart(handlerThread));
thdHandler.Start();
}
}
}
public void handlerThread()
{
Socket handlerSocket = (Socket)alSockets[alSockets.Count - 1];
NetworkStream networkStream = new NetworkStream(handlerSocket);
ntrStream = new NetworkStream(handlerSocket);
strRead = new StreamReader(ntrStream);
strWrite = new StreamWriter(ntrStream);
string textFromClient = strRead.ReadLine();
if (handlerSocket.Connected)
{
}
}
private void timer1_Tick(object sender, EventArgs e)
{
connectToServer();
}
private void connectToServer()
{
IPHostEntry ipHost = Dns.GetHostEntry(server);
try
{
client = new TcpClient(ipHost.AddressList[0].ToString(), 8080);
ntrStream = client.GetStream();
streamWrite = new StreamWriter(ntrStream);
streamYaz.WriteLine("textToServer");
streamYaz.Flush();
ntrStream.Close();
streamWrite.Close();
}
catch (Exception)
{
MessageBox.Show("No Connection");
}
}
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If you're just using alSockets to get a reference to the latest collection, then you can eliminate that entirely.
Give handlerThread an object parameter, and call it as a ParameterizedThreadStart (Check the overloads for the Thread constructor). That way, you can pass the socket itself as a parameter, and avoid the potential race condition.
teknolog123 wrote: if you don't mind, I have another question;
if a client is sending two requests, server has to reply those two requests. If server replies only one instead of two, an exception is thrown. Sometimes I may need to send three requests, how can I prepare the server so that no exception is thrown
Usually you create some sort of communication protocol that both the server and client adhere to. Just make sure the server replies to each message in turn... Not really sure what the problem is here.
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thanks for your reply,
Ian Shlasko wrote: Not really sure what the problem is here.
to be more specific, Client is sending three messages. Server is prepared for replying those three messages.If sometimes client sends four messages, how can I prepare my server to accept that fourth message without exception error?
I'm sorry if I'm not clear enough
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Well, you're going to have to be clearer... Why does it matter if the client sends three messages, four, or four hundred? The server should receive the messages, respond to it, and wait for the next one.
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Hi Guys. How can I check if a file is being used by another process?
I have tried the following but it doesn't seem to work though.
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite, FileShare.None)
If I open the .txt file in NotePad and then run the app it opens the file. What I need to do is for my app to throw an exception that tells me that the file being used by another process, or something like that.
Anybody have any idea?
Thanks
Excellence is doing ordinary things extraordinarily well.
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I'm not sure you can. Notepad Opens the file, reads the content, and closes it again. It may never touch the file again, so how is the OS to know the file is "in use"?
If you think about it, most well behaved applications do much the same - file handles are a scarce resource, so you don't hang onto them unless you really must.
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
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There's no way to tell. Notepad doesn't hold the file open while you are viewing it. It's opened, read, and closed before you even see it on screen. Notepad also doesn't block other applications from reading the file at the same time it is, so this code will fail to detect Notepad using the file in all cases.
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Try opening this file in MS Word. It locks the file when you open it.
Then when you open file, test your application.
Don't forget to rate answer, that helped you. It will allow other people find their answers faster.
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Dear friends
I have small clarification
I have c++ Dll which contains a class like these
public class Vector3d {
public:
float x, y, z;
Vector3d()
{
}
}
when i try to access the class by adding reference in C# project I could only create object for Vector3d class
i am unable to access variables (x,y,z)
my Vector3d Metadata looks like these
[NativeCppClass]
[CLSCompliant(false)]
public struct Vector3d
{
}
i could not find the variables in metadata also... what is the mistake i have done???
And what i have to do get the values to access?
Thanks
Joe.I
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That's because you didn't make them public. Unless otherwise specified, all methods and data members are priviate.
.45 ACP - because shooting twice is just silly
-----
"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
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001
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Dear john,
thanks for reply
Please check the second line in C++ class
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C++ is different than C#. In C++, you only need to specify "public:" once above the members you want to be public, whereas in C# you need to specify "public" in front of each member you want to be public.
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No, they're internal.
/ravi
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I believe you will have to provide set_ and get_ methods in your C++ code to access the data as these are fields.
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Dear peter
Thanks for the reply,
i have not only public variables and also public methods. i could not access anything.
i do not know where is my mistake. is there anything i need to do to access the public method of c++ class?
i just added the dll in my reference, then i specified in the Using namespace.
Thanks
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Is this a managed C++ class? You can't add an unmanaged DLL to .NET like this - you need to either wrap it in a Managed C++ implementation, or you need to p/invoke into it.
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I'm developing a client/server system which uses native sockets for communication between the two.
One irritation I'm having is that once a connection has been established, if one of the processes (client or server) dies or is killed, a SocketException is thrown in the other. Arguably this is correct but I'd much rather have an event fired or a callback or something if the connection breaks - I like to debug things with first chance exceptions turned on (I do know I can filter out SocketExceptions) and it gets in the way.
Does anyone know a way of avoiding these exceptions?
Regards,
Rob Philpott.
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Try/Catch 
I know the language. I've read a book. - _Madmatt
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Yeah, sure I can use exception handling. But what I really want is to handle disconnections without it.
Regards,
Rob Philpott.
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