how to read a file content, that file was already opened ? - C# Discussion Boards

Eddy Vluggen26-Feb-09 1:13

26-Feb-09 1:13

The task-manager just sends messages to the application, and if it doesn't proces them it 'assumes' that the application is dead.

I doubt that the taskmanager gets the exit-reason of each application.

I are troll Smile | :)

CPU

shefa' isied25-Feb-09 20:31

shefa' isied

25-Feb-09 20:31

hi,
how to get user and sys cpu time of a process in c#?
and
how to get total cpu usage of each process in c#?

Re: CPU

Cracked-Down25-Feb-09 22:26

Cracked-Down

25-Feb-09 22:26

see this
http://www.codeproject.com/KB/system/GetHardwareInformation.aspx[^]

Re: CPU

lawrenceinba25-Feb-09 23:54

lawrenceinba

25-Feb-09 23:54

Environment.MachineName
Environment.osversion

the quieter u become more u hear

Socket Programming : Reading From Multiple RFID Reaer

Ravindra Bisen25-Feb-09 20:13

Ravindra Bisen

25-Feb-09 20:13

hi,

I am working on a door lock system. i want to read data from each reader.
if coming data is valid card no. then i have to give 'Gy'[G is address of reader] command to that particular reader. i am using axWinsock1 component and using timer control to read data from
reader . it continuously reading from 'G' reader.

private void timer1_Tick(object sender, EventArgs e)
{
lbl_time.Text = System.DateTime.Now.ToString();
try
{
string cmd = "G0";
byte[] msg = Encoding.ASCII.GetBytes(cmd.ToString());
axWinsock1.SendData(msg);
Object objData = new System.Object();
axWinsock1.GetData(ref objData, 8, 1024);
string strData = (string)objData;
if (strData.Trim() != "0")
{
timer1.Enabled = false;
txtDataRx.Text = txtDataRx.Text + "Input Time : "+ System.DateTime.Now.ToString();
txtDataRx.Text = txtDataRx.Text + " Card No. : "+ strData;
cmd = "Gy";
msg = Encoding.ASCII.GetBytes(cmd.ToString());
axWinsock1.SendData(msg);
axWinsock1.SendData(msg1);
txtDataRx.Text = txtDataRx.Text + "Door Open";
timer1.Enabled = true;
}
}
catch(Exception se)
{
//MessageBox.Show ( );
string msg = se.ToString();
}

}
HOW I IMPLEMENT THIS FOR MORE THEN ONE READER ?
OMG | :OMG:

Re: Socket Programming : Reading From Multiple RFID Reaer

krishnajaga19-Nov-09 1:52

krishnajaga

19-Nov-09 1:52

hi dear

i am also working in same RFID passive card using door open system

i have card reader and passive card when i show my card that reader read.

here we are using TCP/IP and c# asp.net

when i show the card the cardId or details i want to display into my asp.page

so i want write event or delegates if u have coding pls mail me its my mail Id jagamca.cs@gmail.com

Re: Socket Programming : Reading From Multiple RFID Reaer

krishnajaga19-Nov-09 1:54

krishnajaga

19-Nov-09 1:54

card reader to machine
machine to card reader via tcp/ip c# asp.net

how to we fire event or delegate

getting data from reader to asp.net page please if you have send me the tcp/ip method

jagamca.cs@gmail.com

how to read a file content, that file was already opened ?

CooperWu25-Feb-09 19:55

CooperWu

25-Feb-09 19:55

I try these code, but doesn't work,

            string file = @"e:\test.log";<br />
<br />
            FileStream fs1 = new FileStream(file, FileMode.Append, FileAccess.Write, FileShare.Read);<br />
            FileStream fs2 = new FileStream(file, FileMode.Open, FileAccess.Read);            <br />

throw an exception:

System.IO.IOException: The process cannot access the file 'e:\test.log' because it is being used by another process..

how to solve this?

Glad to discuss with you and best wishes.

Re: how to read a file content, that file was already opened ?

Xmen Real 25-Feb-09 20:03

Xmen Real

25-Feb-09 20:03

FileStream fs1 = new FileStream(file, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
FileStream fs2 = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKSQXUFYK[M`UKs*$GwU#(QDXBER@CBN%
Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can

Re: how to read a file content, that file was already opened ?

CooperWu25-Feb-09 20:21

CooperWu

25-Feb-09 20:21

thanks for your reply, i have tried this, throw the same exception.
i nearly tried all 'FileAccess', 'FileShare' combination Frown | :(

Glad to discuss with you and best wishes.

Re: how to read a file content, that file was already opened ?

Xmen Real 25-Feb-09 20:25

Xmen Real

25-Feb-09 20:25

well, I check this and its working without any error

Re: how to read a file content, that file was already opened ?

CooperWu25-Feb-09 20:37

CooperWu

25-Feb-09 20:37

Sorry for my mistake, i create a test project like the first message, and it works.
but in my real project, it always throw the exception...

I wrote a singleton mode class, Logger class, to write log to file.
This logger class has 'LogLevel' property, the actions like in log4net.
then, i wrote a unit test class to test its LogLevel property setting will work.
...
I use the first FileStream in Logger class, then
I use the second FileStream in Logger Unit Test class, to check log message is corrent.
...
the second FileStream always throw that exception.
Frown | :(

Glad to discuss with you and best wishes.

Re: how to read a file content, that file was already opened ?

CooperWu25-Feb-09 20:43

CooperWu

25-Feb-09 20:43

thanks, i fixed it with your help.

i debug the code very carefully, find the exception was throw by next sentence.

StreamReader reader = new StreamReader(fileStream);

but not new FileStream(), so i changed StreamReader to fileStream.GetByte(..)
then it works.

Rose | [Rose]

Glad to discuss with you and best wishes.

Re: how to read a file content, that file was already opened ?

Xmen Real 25-Feb-09 22:53

Xmen Real

25-Feb-09 22:53

glad, you got it work Wink | ;)

OOP Concepts Any article

Rameez Raja25-Feb-09 19:30

Rameez Raja

25-Feb-09 19:30

hi

i want to learn OOP concepts any article or toutorial point to above is highly appericated

where i can learn OOP concepts

Best Regards

Re: OOP Concepts Any article

aaCog25-Feb-09 21:46

aaCog

25-Feb-09 21:46

Visit link

http://en.wikipedia.org/wiki/Object-oriented_programming[^]

Console application in intranet

C. Hariharan25-Feb-09 19:22

C. Hariharan

25-Feb-09 19:22

Hi,

I have a console application to convert XML to HTML through XSLT.
When I try to execute this exe from server (intranet) I encound the following exception:

Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed..

Please advice.

Thanks,
HH

Re: Console application in intranet

ABitSmart25-Feb-09 20:58

ABitSmart

25-Feb-09 20:58

Are you running the application from a network share ? It seems to be fixed in .Net 3.5 SP1. In previous versions it would crash if ran from a share due to the default low trust behavior.
Prior to .Net 3.5 SP1[^]
.Net 3.5 SP1[^]

Re: Console application in intranet

C. Hariharan25-Feb-09 22:22

C. Hariharan

25-Feb-09 22:22

Yes I run the exe from shared folder. And I use .Net 3.5 sp 1 - and still facing this problem.

Thanks,
HH

Re: Console application in intranet

Shyam K Pananghat25-Feb-09 22:59

Shyam K Pananghat

25-Feb-09 22:59

This is due to CAS. Code access security in .Net. There are restrictions set for each zone (You could see it in intranet option or .Net configuation Cosole in control panel). Usually it is Organiasation wide. or enterprose wide settings. and governed by policies by network managers. You can also change this usign caspol.exe, a net command line tool. But better is to either copy it to your local machine or Remote login to that server. rather than accessing it through shared drive

Smile | :)

Shyam..

My Blog dotnetscoups.blogspot.com

inheritance [modified]

aratireddy25-Feb-09 19:00

aratireddy

25-Feb-09 19:00

Using System;
public Class Class1
{
Public Void Hello()
{
Console.WriteLine("base");
}
}
public Class Class2:Class1
{
Public Void Greet()
{
Console.WriteLine("derived");
}
}
Public Class Demo
{
static Void Main()
{
Class1 C1=new Class1();
C1.Hello();
Class2 C2=new Class2();
C2.Hello();
C2.Greet();
Class1 C3=new Class2();
C3.Hello();
}
}
while executing this code in command prompt it is showing the following error
source file inh.cs could not be found
no inputs specified
is there any error in the syntax if there please rectify

modified on Thursday, February 26, 2009 1:07 AM

Re: inheritance

Xmen Real 25-Feb-09 20:09

Xmen Real

25-Feb-09 20:09