C# Discussion Boards - CodeProject

30-Jul-07 19:24

I create an application that writes data from a Richtextbox to a file on hard disk with my own extension. But Windows doesn't know that file, and when I double click it, an Open With.. window appear. Please help me to open my own files with my application when I double click it.
Thank you very much
Sorry for my bad English

Christian Graus30-Jul-07 19:48

Christian Graus

30-Jul-07 19:48

This involves setting up information in the registry. Every app that opens it's docs via the explorer, has itself stored as the default in the registry.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

rkcsharp30-Jul-07 20:14

30-Jul-07 20:14

Thank you for replying my question, but i don't know much about this. Could you please tell me more about this ? Thank you very much

Christian Graus30-Jul-07 20:19

Christian Graus

30-Jul-07 20:19

I'm not sure, to be honest. I have a rough idea, but I was intending mostly to show you enough to put you on the right track.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

rkcsharp30-Jul-07 20:25

30-Jul-07 20:25

Thank you very much! I'll try to find more about this. Have a nice day!

mav.northwind31-Jul-07 0:35

mav.northwind

31-Jul-07 0:35

If you want your application to be associated with a given file extension, you can add the appropriate keys to the registry, like CG said.
Let's say your extension is 'afe' ('arbitrary file extension' Smile | :)

), then you'll have to:
Add a new key HKCR\.afe
Set its standard value to afe_file
Add a new key HKCR\afe_file
Set its standard value to the textual description you want for .afe files.
Add a new key HKCR\afe_file\shell\open\command
Set its standard value to "Full path to your application" "%1"

Now every time you double-click on a .afe-file, your application will get started and given the full path of the file as first commandline parameter.

Regards,
mav

--
Black holes are the places where God divided by 0...

rkcsharp2-Aug-07 1:18

a Question regarding a weird illigal error read/write error

2-Aug-07 1:18

Thank you very much for your help

Green Fuze30-Jul-07 19:00

Green Fuze

30-Jul-07 19:00

Hey Everybody!

I wrote a multi-threaded crawler (which is doing a more than just crawling).
This is the first multi-threaded program I'm writting so I'm having some problems with it.

I have a 2 groups of threads, one is downloading from the net, the other is extracting the URLs and other information.
I've synchronized the threads using semaphores.

The problem is that sometimes, after the program is running for a while, I'm getting an Exception with the message that the process is trying to perform an I/O (read or write) to an illegal spot in the memory (also it adds that it could be a memory corruption).
I've also experienced a few times that the program simply get terminated, without any warning or any notice (the visual studio simply returns to its original stat from the debug stat).

ANY Ideas how to fix that?!
I'm terribly stuck! Frown | :(

Thanks A LOT!!!!

Re: a Question regarding a weird illigal error read/write error

Luc Pattyn30-Jul-07 23:13

Luc Pattyn

30-Jul-07 23:13

Sounds like you are having data corruption, as a result of a lack of
thread synchronization: most data structures are not thread-safe, that is
if one thread is say modifying a List, and another thread suddenly kicks in,
and accesses the same List, it may find it in an inconsistent state.

The one remedy is adding all the required locks; without them, it seems to
work for a while; with them, if applied correctly, it will work forever.

I can't possibly reproduce all the theory here, you should look for either
the lock statement, or some specialized classes such as ReaderWriterLock Class.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Convert string to int

Xmen Real 30-Jul-07 18:59

30-Jul-07 18:59

hi there,
i m trying to convert textbox.text to int but it always giving error while runtime
"Input string was not in a correct format."

textbox.text = "00.0000"
nums =Convert.ToInt32(textbox.text);

i also try

nums =int.textbox.text);</

it give error same above

nums =(int)textbox.text;</

it gives error
Cannot convert type 'string' to 'int'

someone know anyother way???;)

Becoming Programmer...

Green Fuze30-Jul-07 19:03

Green Fuze

30-Jul-07 19:03

try:

int nums = int.Parse(this.textbox.Text);

Martin#30-Jul-07 19:57

Martin#

30-Jul-07 19:57

This will also throw an exception!

All the best,

Martin

Xmen Real 30-Jul-07 20:09

30-Jul-07 20:09

i just want to remove the decimals thats why i m trying to convert it in int as int dont have decimals
i can remove decimals with other methods too but conversion is the best way i thought

Green Fuze wrote:
try:

int nums = int.Parse(this.textbox.Text);

same error

Becoming Programmer...

Christian Graus30-Jul-07 20:19

Christian Graus

30-Jul-07 20:19

What you want requires two steps. First, use double.TryParse ( or you will get an error ). Then, use Math.Floor, or Math.Ceiling, if you want to force rounding. Either way, case the double you end up with to an int.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Martin#30-Jul-07 19:56

Martin#

30-Jul-07 19:56

Hello,

As your string represents a double value, you will get a system format exception.
This would work:

string text = "0";
int inums =Convert.ToInt32(text);

text = "00.0000";
double dnums =Convert.ToDouble(text);

But I recommend to use the TryParse methods.
They will not throw an exception.

double d;
if(double.TryParse(text,System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.CurrentCulture, out d))
{
    //converion is ok
}
else
{
    //conversion is not ok
}

All the best,

Martin

Xmen Real 30-Jul-07 20:10

30-Jul-07 20:10

thanks but i dont want decimals remain

Becoming Programmer...

Martin#30-Jul-07 20:19

Martin#

30-Jul-07 20:19

This will round it mathematical, but you also can use the Math functions or just modify the string.

string text = "1,5345";
double d;
if(double.TryParse(text,System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.CurrentCulture, out d))
{
    int inums = Convert.ToInt32(d);
}

All the best,

Martin

Xmen Real 31-Jul-07 19:06

31-Jul-07 19:06

ok i will

Becoming Programmer...

Rhys Gravell30-Jul-07 21:03

Rhys Gravell

30-Jul-07 21:03

Data Entry Validation.

If decimals are illegal values prevent or validate their entry, don't leave your users guessing what the expected entry is.

Rhys

"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it"

They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance."
Terry Pratchett

Peter Vertes1-Oct-07 10:29

Peter Vertes

1-Oct-07 10:29

First off you are trying to convert a Double to an Int with is not exactly what you are looking to do. Read this article; this will shed some light on the subject for you:

http://iheartdotnet.blogspot.com/2007/09/cast-vs-doubleparse-vs-converttodouble.html[^]

Xmen Real 1-Oct-07 16:36