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Yes - it throws the same exception.
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hello friends,
I want to get a handle to the currently open instance of the microsoft word. I got that successfully but after that I want to get the inputstream to that process (word). I found method for that but I am getting an error at that statement. my code is as under. someone please give me some suggestion. also let me know if I am doing it in a wrong way.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Windows;
using System.IO;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
Process p = new Process();
p.StartInfo.FileName = "C:\\Program Files\\Microsoft Office\\OFFICE11\\WINWORD.exe";
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardInput = true;
p.Start();
StreamWriter sw = p.StandardInput;
sw.WriteLine("This is a test");
Process[] procs = Process.GetProcesses();
foreach (Process proc in procs)
{
if (proc.MainWindowHandle.ToInt32() != 0)
{
if (proc.ProcessName == "WINWORD")
{
System.Windows.Forms.MessageBox.Show(proc.Handle.ToString());
StreamWriter myStreamWriter = proc.StandardInput;
myStreamWriter.WriteLine("This is a Test");
}
}
}
}
}
-vaishnav hardik
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Where did you see that MS Word will process data from the input stream?
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Hi guys,
In my title bar title text I have my application name and then next to it I would like to put TM, in very small letters. How can I do that?
Please help
sasa
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Open up Microsoft Word, Choose Insert --> Symbol.
Select the 'TM' symbol
Copy it
Paste it in the TEXT property of your form.
This is the 'non technical' way of doing it 
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If you don't have word, use charmap isntead.
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Problem is already solved What can I do now 
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Hi All !
I want to get a Sum after Filtering some special record , for example [price] is a field in my Table1 .
strFilter="SELECT price From Table1 WHERE City='Athen'";
After filtering with this Query in my Report , I want to get a Sum for the all price related for City='Athen' and I show it in a Label .
Thanks A lot ,
Regards ,
s_mostafa_h
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You can create a running total field or a function. If you just want the sum
SELECT sum(price) as sumOfPrice FROM table WHERE city='Athen'
A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."
-- Stephen Crane
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thanks
infact :
strFilter="SELECT sum(price) as sumOfPrice FROM table WHERE city='"+txtCity.Text+"'";
I want to put the result of this query in a Label .
s_mostafa_h
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I don't know if your particular application is subject to this but it is always wise to use stored procedures or at the very least parameterization of your query.
SELECT sum(price) as sumOfPrice FROM table WHERE city = @city;
A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."
-- Stephen Crane
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thanks for ur patient ,
I'm very  ,
Crystal Report simply provide this .
s_mostafa_h
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Hello Devs,
I'm developing a Chat application and I'm facing a problem. I have the following Method which is called from multiple threads. And when I start sending too much messages in speed (which invokes this method so fast) then client is disconnected. Let me show you the method and then continue my discussion:
public void SendMessage(TextMessage messageToSend)<br />
{<br />
try<br />
{<br />
lock (this.dataStream)<br />
{<br />
byte[] serializedBytes = messageToSend.GetBytes();
byte[] encMessageBytes = encryptorDecryptor.Encrypt(serializedBytes);
serializedBytes = null;<br />
int messageSize = encMessageBytes.Length;<br />
byte[] messageSizeBuffer = new byte[this.messageDataLengthBufferSize];<br />
messageSizeBuffer = BitConverter.GetBytes(messageSize);<br />
this.dataStream.Write(messageSizeBuffer, 0, this.messageDataLengthBufferSize);
this.dataStream.Write(encMessageBytes, 0, messageSize);
this.dataStream.Flush();<br />
messageSizeBuffer = null;<br />
encMessageBytes = null;<br />
}<br />
<br />
}<br />
catch (Exception ex)<br />
{<br />
string str = ex.Message + "\n" + ex.StackTrace;<br />
Disconnect();<br />
if (Disconnected != null)<br />
{<br />
Disconnected(this, EventArgs.Empty);<br />
}<br />
}<br />
}
In my opnion, the cause of this problem is multi threaded environment or it overflows data when i start sending to fast. for example if it is already working to send data on NetworkStream then a new call to this method is made which passes a new object of TextMessage to it which over writes the existing one so it is all messed up.
Note: Actual exception I get on the receiving end when length of data is not one which is supposed to be. See the code for Receiving:
int messageSize = BitConverter.ToInt32(messageDataLengthBuffer, 0);<br />
MemoryStream memstrm = new MemoryStream();<br />
<br />
readByteCount = 0;<br />
while (messageSize > 0)<br />
{<br />
readByteCount = dataStream.Read(this.messageDataBuffer, 0, messageDataBuffer.Length);<br />
if (readByteCount < 1)<br />
{<br />
Disconnect();<br />
return;<br />
}<br />
memstrm.Write(this.messageDataBuffer, 0, readByteCount);<br />
messageSize -= readByteCount;<br />
}<br />
memstrm.Position = 0;<br />
<br />
byte[] decryptedData = encryptorDecryptor.Decrypt(memstrm.ToArray());<br />
receivedMessage = new TextMessage(decryptedData);<br />
<br />
memstrm.Close();<br />
memstrm = null;
On the receving end I read 4 bytes as a size of incoming message then loop the piece of code to get all data untill complete message is received as of the message size. So when i start messages too fast then at the end of the loop "messageSize" usually gets in -ve which must never be less than 0 and when i try to get data decrypted again, it throughs exception "Length of data is invalid".
Is there any way that i can implement a mechanism that if SendMessage is doing its work then it should not be called again untill its done with its existing work? Or any other way to solve this issue?
Its really urgent. Any help will be really appreciated!!!
Best Regards
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I assume that this.dataStream is the stream you are sending? If so better to create a queue of messages to send and then have a thread loop through the queue. Best part is that you will have a minimum of fuss.
private void AThreadedMethod(){
while(go){
if(queue.Count >0){
someObject = queue.Dequeue();
... do your stuff here
}
}
}
A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."
-- Stephen Crane
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Thanks for reply, Yes dataStream is an object of NetworkStream. I can understand the mechanism of Queing the messages but creating 100 threads for 50 Clients(50 on client end and 50 on server end) will seriously do a rape with CPU;P. One easiest way to solve this problem is to put Thread.Sleep(50); above each call of this method. Which will also not consume CPU but its cheap and will hit performance of application.
Best Regards,
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And queue objects with message and connection details?
A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."
-- Stephen Crane
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Did not get it 
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Thread.Sleep(50) is VERY WRONG synchronization.
In fact it's no syncrhonization at all, it just decrease bug frequency, making them even more difficult to debug.
Beside you only need 2 thread and a queue.
1 reader thread (or num CPU/2)
1 writer thread (or num CPU/2)
and then a queue of
{
Stream dest;
byte[] data
}
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Just to be sure, you're reading from and writing to a dataStream variable. Are those two different data streams in two different classes or are they the same stream?
Logifusion[^]
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yes dataStream is an object of NetworkStream which is used for both reading and writing messages on the stream. Any solution?
Best Regards
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The situation you have matches what you would use a ReaderWriterLock[^] for. A reader/writer lock allows only one writer at a time, but several readers at a time.
The only concern I would have after that is if you can only allow one reader at a time. In that case, I would stick with the lock you have, but apply the lock to readers as well. In the code you have above, it looks like you obtain a lock to write to the stream, but not to read. If a call to the read method happens in the middle of your write method, there's nothing in that read method checking if there's a lock or not. So it's entirely possible reads are still happening during your writes. You have to use the lock on both sides.
Logifusion[^]
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First of all yes! I'm maintainging locks on both read and write that is not problem with my case. The problem in my case is when
A piece of code calls
SendMessage(TextMessage textMessage)
{
// Doing work here
}
then an other piece of code calls this Method with a new object of TextMessage
Send(TextMessage textMessage)
{
// Doing work here
}
the second class overwrite the previous object of TextMessage Class and then the some part of data written to the stream is from the last object and one from the new object.
Its different from the scenerio you are pointing that stream is misbehaved. Stream is already locked and that is safe the only thing is grabbled is TextMessage Objec that is passed to the method.
Do you think I'm right?
If so then please suggest something. I'm really stucked at this problem.
Best Regards,
Rizwan
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There's not much information for me to go off of here. It looks like you have two different methods that write a TextMessage out to a stream. Are these methods in the same class or in different classes? Do they work with the same stream and obtain the same lock? Do you have two instances of the class that are talking to the same underlying network stream? I guess what I'm looking for here is if you have a singleton that has a monopoly over this network stream. Everything that goes to that stream therefore has to go through the same object (or through static methods of the same class). Then it's down to a syncronization issue on the methods reading and writing to that stream.
Logifusion[^]
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Forget about all the things and focus only on this code:
public void SendMessage(TextMessage messageToSend)<br />
{<br />
try<br />
{<br />
lock (this.dataStream)<br />
{<br />
byte[] serializedBytes = messageToSend.GetBytes();
byte[] encMessageBytes = encryptorDecryptor.Encrypt(serializedBytes);
serializedBytes = null;<br />
int messageSize = encMessageBytes.Length;<br />
byte[] messageSizeBuffer = new byte[this.messageDataLengthBufferSize];<br />
messageSizeBuffer = BitConverter.GetBytes(messageSize);<br />
this.dataStream.Write(messageSizeBuffer, 0, this.messageDataLengthBufferSize);
this.dataStream.Write(encMessageBytes, 0, messageSize);
this.dataStream.Flush();<br />
messageSizeBuffer = null;<br />
encMessageBytes = null;<br />
}<br />
<br />
}<br />
catch<br />
{<br />
}
Now try to follow me:
Code bock 'A' Makes a call SendMessage(textMessage1);
and SendMessage is in the middle of its work and a Code Block 'B' also call this Method SendMessage(textMessage2);
the second call overwrite the textMessage1 with textMessage2 I think this is the problem May be I'm wrong I dont know what to do
Thanks for your help. If you have something more in mind please help me. I really need this so urgent.
Best Regards,
Rizwan
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Well, you have a lock, which is fine. The lock will only let one thread through this code at a time. This is guaranteed. What's not guaranteed is what I'm asking about. This method is not static, so it must be an instance method. I assume that dataStream is also not static. My question is about where dataStream goes. Does it wrap around an existing stream that other objects can also wrap around? If you have a stream that is shared between two or more objects with this SendMessage method, then the lock is useless. That's why I'm asking if this is a singleton or not.
Logifusion[^]
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