Re: Get value to byte() - C# Discussion Boards

WebBrowser + Threads help, please! i dunno what to do anymore...

yoni10009-Jul-06 12:34

9-Jul-06 12:34

hey, i'm writing an application which uses a WebBrowser control to navigate a database of sites and do stuff with it.
i know i better use http request but i can't for the specific thing i wanna do.

anyway, my architure is:
WindowForm which creates a single thread, and the thread creates few threads which do all the work.

My problem is, that after an unspecific time, the application hangs... i have no idea why, i've created a message pump inside the small thread with the webbrowser and all threads hang at "DispatchMessage" while teh main thread hangs at m_Smallthread.Start();

This is the code for the main thread:

{
// Fill first the list.
m_lvListView.Invoke(UpdateTheListView, m_dsMyURLs);

// No threads are running.
m_nCurrThreadsRunning = 0;

// This goes over sites.
int nSiteCounter = 0;

// Go over sites
while (nSiteCounter < m_dsMyURLs.Tables[0].Rows.Count)
{
// Check the curr thread num, that is no longer than max boz
if (m_nCurrThreadsRunning < m_nMaxNumberOfThreadsBoz)
{
// Create wanted manual event.
m_StopChildThreads = new ManualResetEvent(false);
m_eSmallThreadStopped = new ManualResetEvent(false);

// Gets real url.
string url;
if (m_dsMyURLs.Tables[0].Rows[nSiteCounter].ItemArray[2].ToString() != "")
{
// Add site name
url = m_dsMyURLs.Tables[0].Rows[nSiteCounter].ItemArray[2].ToString();
}
else
{
// Add site name
url = m_dsMyURLs.Tables[0].Rows[nSiteCounter].ItemArray[1].ToString();
}
try
{
// Create new single getter.
SingleSiteGetter sgSingleGetter =
new SingleSiteGetter(url,
nSiteCounter, EndSingleThreadFunc, m_lvListView,
m_uaArguments, m_StopChildThreads, m_eSmallThreadStopped,
m_nSecsToNavigateWait, m_bDoChilds, ref m_bIsDoEventsLocked);

// Create the thread.
Thread trSingleGetThread = new Thread(sgSingleGetter.StartSmallThread);
trSingleGetThread.Name = "SmallBrowserThread number " + nSiteCounter.ToString();

// Specify it as STA
trSingleGetThread.SetApartmentState(ApartmentState.STA);

Interlocked.Increment(ref m_nCurrThreadsRunning);

// Lock thread, and add it.
Monitor.Enter(m_hThreads);
m_hThreads.Add(m_StopChildThreads, trSingleGetThread);
Monitor.Exit(m_hThreads);

trSingleGetThread.Start();

++nSiteCounter;
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}

}
else
{
// Continue if all ok.
Thread.Sleep(300);
}

// Check for canceling
if (ClosureThreadFunc())
{
return;
}
}

// Check that all small threads are done.
while (m_hThreads.Count > 0)
{
// Continue if all ok.
//Application.DoEvents();
Thread.Sleep(500);

// Check for canceling.
if (ClosureThreadFunc())
{
return;
}
}

// Make asynchronous call to main form
// to inform it that thread finished
m_frmPirsumon.Invoke(m_frmPirsumon.m_delegateThreadFinishedEvent, null);
}

* In the above code, we always check if number of threads is not at maximum allowed.

this is the code for small thread:
************************
// Says that its initilizing.
m_lvListView.Invoke(SingleUpdatingProc, m_nSiteIndex, "Starting...", ListViewColums.STATUS);

// Init the web browser (new webbrowser + events).
InitilizeWebBrowser();

// Handle navigation.
int nNavigateResult = Navigate(m_strUrl);
*********

**** This navigates into site: *********
private int Navigate(string strSite)
{
int nResult = ALL_OK;

// Navigate to the wanted url.
m_wbMyBrowser.Navigate(strSite);
DateTime dtNavigatePressTime = DateTime.Now;
m_lvListView.Invoke(SingleUpdatingProc, m_nSiteIndex, "Surfing...", ListViewColums.STATUS);

// Wait till the navigate is completed.
while (nResult == ALL_OK &&
m_wbMyBrowser.ReadyState != WebBrowserReadyState.Complete)
{
// Get how much time passed sience navigation.
TimeSpan tTimeSpent = DateTime.Now.Subtract(dtNavigatePressTime);

// check if time expired.
if (tTimeSpent.TotalSeconds >= m_nSecsToWait)
{
// Stop browser.
// m_wbMyBrowser.Stop();

// Update list
m_lvListView.Invoke(SingleUpdatingProc, m_nSiteIndex, "Error", ListViewColums.STATUS);
m_lvListView.Invoke(SingleUpdatingProc, m_nSiteIndex, "Site did not respond after specified time.", ListViewColums.COMMENTS);
nResult = TIME_ELAPSED;
}

// Check stop event.
else if (m_rsStopIt.WaitOne(0, true))
{
// Stop browser.!
// m_wbMyBrowser.Stop();

m_rSmallIsStoppedNow.Set();

nResult = STOP_PRESSED;
}
else
{
// Handle events.
DoEventsSux();

Thread.Sleep(50);
}
}

return (nResult);

}
My while is checking the state of browser, if time exceeds or stop pressed, it stops it. otherwise, it pumps messages.
my DoEventsSux is a simple peek -> get -> translate -> dispatch that i took from "user32.dll"

thats it, it just hangs everything at some point.
Maybe i did something wrong with the "STA" programming?
i'm at dead end and i'm actually thinking of dropping this project off.. and i've been writing it for a month and a half.

Help!
thanks!!

Ariel.

Re: WebBrowser + Threads help, please! i dunno what to do anymore...

S. Senthil Kumar9-Jul-06 18:58

S. Senthil Kumar

9-Jul-06 18:58

Is your main thread the UI thread (the thread on which Application.Run is called)? If so, you're blocking the main thread with the while (m_hThreads.Count > 0) loop. The main thread cannot pump anymore, so any synchronous Invoke would cause the calling thread to hang.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

can someone post me a simple chat application

lehya9-Jul-06 8:10

lehya

9-Jul-06 8:10

Please help to make a simple chat application using Asp.net C# and XML or SQLserver

Re: can someone post me a simple chat application

Ravi Bhavnani9-Jul-06 9:14

Ravi Bhavnani

9-Jul-06 9:14

Perhaps these articles will help?

/ravi

My new year's resolution: 2048 x 1536
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com

Get value to byte() [modified]

hung_ngole9-Jul-06 5:57

hung_ngole

9-Jul-06 5:57

Hi,
I have the following code, how can I get the value of the stream into byte array (the response contains binary data and using the readToEnd() fails)

HttpWebResponse response = request.GetResponse()
System.IO.Stream responseStream = response.GetResponseStream()

Thanks in advance,
Hung.

Hung

-- modified at 12:02 Sunday 9th July, 2006

Re: Get value to byte()

Eran Aharonovich9-Jul-06 7:29

Eran Aharonovich

9-Jul-06 7:29

You can check my article about browsing the WEB with C#:

Browse the WEB with C#

Eran Aharonovich (eran.aharonovich@gmail.com )
Noviway

Re: Get value to byte()

hung_ngole9-Jul-06 16:12

hung_ngole

9-Jul-06 16:12

I have the problem with binary data (Ex: image) not the textual data!
Thanks anyway,
Hung.

Hung

Re: Get value to byte()

Eran Aharonovich9-Jul-06 22:42

Eran Aharonovich

9-Jul-06 22:42

You are right. Sorry.

This is what you need to do:

// Prepare web request...
HttpWebRequest myRequest =
(HttpWebRequest)WebRequest.Create("http://www.noviway.com");

// We use POST ( we can also use GET )
myRequest.Method = "GET";

// Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
HttpWebResponse myHttpWebResponse= (HttpWebResponse)myRequest.GetResponse();

// Display the contents of the page to the console.
Stream streamResponse = myHttpWebResponse.GetResponseStream();

MemoryStream memStream = new MemoryStream();

byte[] readBuffer = new byte[256];

// Read from buffer
int count = streamResponse.Read( readBuffer, 0, 256 );

while (count > 0)
{
memStream.Write(readBuffer, 0, count);

// Read from buffer
count = streamResponse.Read( readBuffer, 0, 256);
}

byte[] originalBuffer = memStream.ToArray();

// Release the response object resources.

streamResponse.Close();

// Close response
myHttpWebResponse.Close();

Eran Aharonovich (eran.aharonovich@gmail.com )
Noviway

Re: Get value to byte()

Nader Elshehabi9-Jul-06 11:09

Nader Elshehabi

9-Jul-06 11:09

Hello

Try this:

HttpWebResponse response = request.GetResponse()
System.IO.Stream responseStream = response.GetResponseStream()
byte[] input = new byte[responseStream.Length];
responseStream.Read(input, 0, (int)responseStream.Length - 1);

Regards

Re: Get value to byte()

hung_ngole9-Jul-06 16:11

hung_ngole

9-Jul-06 16:11

Although the stream has data, the length of responseStream is -1. This is the main problem I facing !!

Thanks anyway!
Hung.

Hung

Re: Get value to byte()

S. Senthil Kumar9-Jul-06 19:08

S. Senthil Kumar

9-Jul-06 19:08

According to the MSDN[^] documentation, Read returns the number of bytes actually read. So you could always create a buffer of some arbitrary size, say 512 bytes, and then loop till Read returns less than 512 bytes. Something like.

ArrayList finalBuffer = new ArrayList();
byte []buffer = new byte[512];

int bytesRead = 0;
while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) != 0)
{
   for (int i = 0; i<bytesRead; ++i)
   {
       finalBuffer.Add(buffer[i]);
   }
}

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

more assemblies to one assembly

dedel9-Jul-06 5:48

dedel

9-Jul-06 5:48

Is there a chance to compile more assemblies to one assembly ?

Re: more assemblies to one assembly

Graham Dean9-Jul-06 7:20

Graham Dean

9-Jul-06 7:20

Whereas I am no expert on VS, I have noticed that Dotfuscator Pro has such a facility - the CE edition is supplied free with VS. Search the internet for info. If this doesn't help - sorry but my knowledge is so limited that I am unlikely to be able to help further!

Cheers

Pensioner Graham Dean

Re: more assemblies to one assembly

Guffa9-Jul-06 10:42

Guffa

9-Jul-06 10:42

Please don't cross post.

---
b { font-weight: normal; }

Re: more assemblies to one assembly

Nader Elshehabi9-Jul-06 11:12

Nader Elshehabi

9-Jul-06 11:12

Hello

Please be specific or at least post more details on your question. What do you mean by:

dedel wrote:
compile more assemblies to one assembly

Regards

Re: more assemblies to one assembly

dedel9-Jul-06 11:31

dedel

9-Jul-06 11:31

i want to build a DLL from a collection of DLLs

Re: more assemblies to one assembly

Nader Elshehabi9-Jul-06 12:50

Nader Elshehabi

9-Jul-06 12:50

Sorry!!
Not if you don't have the source code. Without the source all you can do is referencing.

Regards Rose | [Rose]

Re: more assemblies to one assembly

kasik9-Jul-06 13:01

kasik

9-Jul-06 13:01

Take a look at ILMerge[^] Smile | :)

“Accept that some days you are the pigeon, and some days you are the statue” -- David Brent

Cheers,
Will

How to create a waiting screen while the current form process a task?

yossof elnaggar9-Jul-06 4:33

yossof elnaggar

9-Jul-06 4:33

i have form1 do something. the time required to do is about 2 minutes.
i want to display a form(waiting screen) while form1 complete the task.

my idea is that:
before doing the required task,
- create a new thread.
- open the waiting form in the thread.
- start the thread

it works, but you can access the form1 during doing task.

any idea?

Re: How to create a waiting screen while the current form process a task?

Andrew Lygin9-Jul-06 5:20

Andrew Lygin

9-Jul-06 5:20

You can make your waiting form modal and show it in the main thread but process a task in a separate thread.

Re: How to create a waiting screen while the current form process a task?

yossof elnaggar9-Jul-06 21:22

yossof elnaggar

9-Jul-06 21:22

many thanks, but how close the modal after the process finished

Re: How to create a waiting screen while the current form process a task?

Andrew Lygin9-Jul-06 22:32

Andrew Lygin

9-Jul-06 22:32

Keep reference on the waiting form and close it at the end of the working thread:

private WaitForm waitForm;
private delegate void CloseWaitFormDelegate();

private void StartProcess()
{
    Thread processThread = new Thread(new ThreadStart(Process));
    waitForm = new WaitForm();
    processThread.Start();
    waitForm.ShowDialog(this);
}

private void Process()
{
    // Process code here...
    CloseWaitFormDelegate closeWaitForm = new CloseWaitFormDelegate(CloseWaitForm);
    Invoke(closeWaitForm);
}

private void CloseWaitForm()
{
    if (waitForm != null)
    {
        waitForm.Close();
        waitForm = null;
    }
}

-- modified at 4:35 Monday 10th July, 2006

Re: How to create a waiting screen while the current form process a task?

Nader Elshehabi9-Jul-06 11:02

Nader Elshehabi

9-Jul-06 11:02

Hello
You can set the Enabled property of your first form to false; then make it true again when you finish your task.

Form1.Enabled = false;
Form1.ShowWaitScreen();
Form1.DoMyWork();
Form1.CloseWaitScreen();
Form1.Enabled = true

Regards

Re: How to create a waiting screen while the current form process a task?

LongRange.Shooter10-Jul-06 8:39

LongRange.Shooter

10-Jul-06 8:39

If you do a search in CodeProject for SplashScreen you will find an example in there of what you need to do.

Combobox issue

V.9-Jul-06 3:05

9-Jul-06 3:05

Hi guys,

I have a combobox (DropDownStyle = DropDown). This Combobox is loaded with a DataSource and Display- and ValueMember set.

I can set a free text to the combo, but when I try to read it out again, it always reads an item that is part of the datasource.

How can I solve this? Can you add items to your datasource? Is there another way around this? Maybe one of my properties is set incorrect? (although I checked them and they seem ok).

This is the last bug I could find and tomorrow morning I only have about 1 hour to install and bugfix our application so I hope somebody can help me (pleasing my boss and client Wink | ;-)

)

TNX!

I've found a living worth working for, but I haven't found work worth living for.

<marquee> Beer | [beer]

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