asychronicly downloading files - C# Discussion Boards

gmhanna7-Dec-05 9:22

7-Dec-05 9:22

Hi,

I have a Web Based C# program that is calling a legacy .DLL file made up of approximately 250 routines to perform credit card authorizations. I'm receiving a System.NullReferenceException somewhere within in the .DLL.

Once the Web C# program calls the initial .DLL module, I lose control of the debugger until it returns. The exception handler in the Web C# program is sighting the initial module as the one that had the NullReferenceException, however I know this is not true.

How can I obtain the real routine that is having a problem? What would be even better is an approximate line number within the routine. I have the source code to the DLL and can add something in there. I just don't want to add printf routines all over it saying, I'm here, I'm leaving.

Thank you,

Glenn

Re: Debug Help

Judah Gabriel Himango7-Dec-05 10:37

Judah Gabriel Himango

7-Dec-05 10:37

When you run your app, just attach the Visual Studio debugger to the native process via Tools->Attach to Process...

Also, since you have the source, why not just create a Visual Studio solution with your legacy source as one project in the solution, and your Web C# program as another project in your source? I imagine Visual Studio can take care of the details from there.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Bought a House!
Judah Himango

Re: Debug Help

gmhanna8-Dec-05 5:40

gmhanna

8-Dec-05 5:40

Hi Judah,

I tried to do what you suggested, Tools->Attach to Process... Selected Internet Explorer, clicked Attach and then clicked the check box for Native. Pressed F11 to step into the call and it didn't stop at the error in the DLL.

I thought of creating another Visual Studio project for the DLL, however when I tried to compile it, it took me several hours to remove the error messages from just one of the 250 routines. The .DLL is built with Watcom's 10.6 compiler and is a standard windows DLL.

The C# routine for the web has a try and catch block. Maybe I can add one of those to the C DLL entry point and print out the information. I'll have to go digging in the garage for the Watcom Manauls.

Your thoughts?

Glenn

failure of the code when the mouse go out of the picturebox area

haytham_mohammad7-Dec-05 8:46

haytham_mohammad

7-Dec-05 8:46

i attached a program that view image and make some processing on this image but when the mouse get from the boundaries of the picturebox the code failed although when the mouse moves toward right or left or up dut to picture the coe still work , it faill only when the mouse move toward the bottom of the picture
plz i need a solution to this problem
thanks in advance

haitham

Re: failure of the code when the mouse go out of the picturebox area

Judah Gabriel Himango7-Dec-05 10:39

Judah Gabriel Himango

7-Dec-05 10:39

There is no way for us to help you unless you give us some code. Did you try debugging the application using a debugger such as Visual Studio? This will tell you were the exception is occurring and why its occurring.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Bought a House!
Judah Himango

Re: failure of the code when the mouse go out of the picturebox area

haytham_mohammad7-Dec-05 11:19

haytham_mohammad

7-Dec-05 11:19

Sorry I forget to accompany the code with message
Here you are the code

private void pictureBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)<br />
       {<br />
           //          MessageBox.Show("Mouse move on Picture box, at" + e.X.ToString() + ","+ e.Y.ToString());<br />
           try<br />
           {<br />
               textBox1.Text = e.X.ToString();<br />
               textBox2.Text = e.Y.ToString();<br />
               Bitmap myBitmap = new Bitmap("Calvin2.jpg");<br />
               Color pixelcolor = myBitmap.GetPixel(e.X, e.Y);<br />
               textBox3.Text = pixelcolor.ToString();<br />
               textBox4.Text = myBitmap.PixelFormat.ToString();<br />
               label5.Text = "Red depth is " + pixelcolor.R.ToString();<br />
               label6.Text = "Green depth is " + pixelcolor.G.ToString();<br />
               label7.Text = "Blue depth is " + pixelcolor.B.ToString();<br />
           }<br />
           catch (System.ArgumentOutOfRangeException)<br />
           {<br />
           }<br />
       }

and i use visual studio.net 2003

haitham

Re: failure of the code when the mouse go out of the picturebox area

Judah Gabriel Himango7-Dec-05 15:09

Judah Gabriel Himango

7-Dec-05 15:09

Well, is the picturebox the same size as the calvin image? If not, then a call to GetPixel(e.X, e.Y) may fail.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Bought a House!
Judah Himango

asychronicly downloading files

stassaf7-Dec-05 8:34

stassaf

7-Dec-05 8:34

Hi,

I'm trying to download several files at the same time in order to increase
performance.
I've tried to define a method that downloads a file, delegate this method and
call BeginInvoke in a loop.
The problem is that every BeginInvoke returns an IAsyncResult and I don't know
how to figure out when all the calls for this methods where completed.

My Code:
public class AsyncDemo
{
// The method to be executed asynchronously.
public bool TestMethod(string fileAdd, string fileName, out int threadId)
{
threadId = AppDomain.GetCurrentThreadId();
try
{
WebClient Client = new WebClient ();
Client.DownloadFile(fileAdd, fileName);
}
catch(Exception ex)
{
return false;
}
return true;
}
}

public delegate bool AsyncDelegate(string fileAdd, string fileName, out int threadId);

static void Main(string[] args)
{
//files to download
string[] fileUrlArr = new string[2];
string[] fileNameArr = new string[2];
fileUrlArr[0] = "http://www.site1.com/xxx.xml";
fileNameArr[0] = "file1.xml";
fileUrlArr[1] = "http://www.site2.com/xxx.xml";
fileNameArr[1] = "file2.xml";
int threadId;

// Create an instance of the test class.
AsyncDemo ad = new AsyncDemo();

// Create the delegate.
AsyncDelegate dlgt = new AsyncDelegate(ad.TestMethod);
IAsyncResult ar=null;

for(int i=0; i<2; i++)
{
// Initiate the asychronous call.
ar = dlgt.BeginInvoke(fileUrlArr[i], fileNameArr[i],out threadId, null, null);
}

ar.AsyncWaitHandle.WaitOne();
}

Any help will be appreciated.
Best Regards,
Assaf

Re: asychronicly downloading files

Judah Gabriel Himango7-Dec-05 10:43

Judah Gabriel Himango

7-Dec-05 10:43

First, there are many articles on the web about using WebRequests asynchrounously. I suggest you read a few, such as this one[^].

After you've downloaded the file asynchronously, just store it in some class variable (or, if you have multiple files, store the files by adding them to some list such as System.Collections.Generic.Queue or System.Collections.Generic.List.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Bought a House!
Judah Himango

Re: asychronicly downloading files

stassaf7-Dec-05 11:44

stassaf

7-Dec-05 11:44

10x, this was very helpful.

which column in a datarow?

melanieab7-Dec-05 8:09

melanieab

7-Dec-05 8:09

Hi,
I finally got a search in a datatable working (so that I can type "p", and the first row with data beginning with a p is highlighted). I use this:

string searchThis = "p";<br />
DataRow[] dr = tCat.Select("Customer LIKE'" + searchThis + "*'");

My problem is that I need to specify which column to search in. The way it is now, if something starts with a p in the first column, it will highlight the row. (I need to search one of four columns.) Is there any way to determine which column the matched string was found in?
Thanks again so much!
Mel Smile | :)

how to call excel from a asp.net page specifing a file to open?

Sasuko7-Dec-05 5:12

Sasuko

7-Dec-05 5:12

By a asp.net page I want to open a file .xml located on my server with excel.
Can i do it?

Re: how to call excel from a asp.net page specifing a file to open?

J4amieC7-Dec-05 5:55

J4amieC

7-Dec-05 5:55

if you open a file that is on the server in excel...excel will open on the server. If you want the USER to open a file with excel, you will have to get him/her to download it first.

This question would be better suited to the ASP.NET forum

-- modified at 11:55 Wednesday 7th December, 2005

Re: how to call excel from a asp.net page specifing a file to open?

Sasuko7-Dec-05 5:56

Sasuko

7-Dec-05 5:56

i can't use excell.dll

WinForms User Control in VB6 App

Paul Gates7-Dec-05 5:05

Paul Gates

7-Dec-05 5:05

Hi All,

I have developed a set of User Controls for an application that we would now
like to backfill into a VB6 application. I believe that it is possible to
create an ActiveX control out of the User Control and embed it in a
WebBrowser, but I haven't found any good examples of this. Could anybody
point me to one?

Alternatively, if anybody has any better solutions, I'd be very happy to
hear them.

Thanks,
Paul

Re: WinForms User Control in VB6 App

miah alom7-Dec-05 6:55

miah alom

7-Dec-05 6:55

You should be looking for tlbexp.exe.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cptools/html/cpgrfTypeLibraryExporterTlbExpexe.asp[^]

Component and ServicedComponent

faviochilo7-Dec-05 4:39

faviochilo

7-Dec-05 4:39

Hi friends:

I wrote a componenet in C#(derived from System.ComponentModel.Component)

now, i want use this component in a COM+ Application with pooling objects

but i have samples of componentServiced, and all classes derived from System.EnterpriseServices.ServicedComponent

can you tellme why the serviced component does not inherit of System.ComponentModel.Component or System.ComponentModel.IComponent ????

thanks in advance Wink | ;)

How to make pretty forms in VS

mehrdadc487-Dec-05 2:34

mehrdadc48

7-Dec-05 2:34

hi.
I want to make pretty forms (with curved edges and with nice shapes) in VS.NET 2005 (C#).
how can I do it?

Best wishes

Re: How to make pretty forms in VS

Judah Gabriel Himango7-Dec-05 4:04

Judah Gabriel Himango

7-Dec-05 4:04

There are lots of articles on the web[^], on CodeProject[^] and on MSDN[^] regarding how to create non-rectangular forms.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Bought a House!
Judah Himango

Custom Titlebar

PHDENG817-Dec-05 2:15

PHDENG81

7-Dec-05 2:15

I have a custom title bar that I simply made from a label. My form is fixeddialog so I can get that raised effect. Everything looks great until I minimize my form to the taskbar. When I do this, I only see the corresponding icon and not the text. This is because my borderstyle isn't "none." And to have a fixeddialog form without a titlebar, you must make the text "". Therefore, I came up with this: When I minimize my form, I change the borderstyle and text so that it appears in the taskbar. The trick now is to get it to restore without the Titlebar. Essentially, I just need to do the opposite of what I did when I minimized the form.

So, my question, do I have access to the "restore" event handler that is called when you either click or right-click on the item in the taskbar? If not, does anyone have another solution to this problem? Thanks in advance.

In java for xml binding zews framework is used ,let me know in C#.net?

sridevi20057-Dec-05 1:28

sridevi2005

7-Dec-05 1:28

Hi I have one xml file,which contains some elements,so i want to load into C# application..i used to NUnit test cases for loading file or not ,,
cheers

Sridevi

How to get PeakWorkingSet property after process exited?

m3rlinez7-Dec-05 1:19

m3rlinez

7-Dec-05 1:19

I had tried googling but didn't found the answer to my case.

This problem is about PeakWorkingSet property of System.Diagnostics.Process class. This prop store the maximum amount of memory used by process during run time, but this property is inaccessible after the process has exited.

One workaround I used is to start another thread to monitor this property, but this is not well enough because some of processes I started exited too fast. ( They started and exited immediately).

Does anyone know how to get PeakWorkingSet property after process exited? or better workaround to this kind of problem.

Thank you Smile | :)

To access and print the values in Hashtable?

MudkiSekhon7-Dec-05 1:16

MudkiSekhon

7-Dec-05 1:16

How can i print the values contained in System.Collections.Hashtable...............

Thanks,
Sandeep
+919891027854

Re: To access and print the values in Hashtable?

Maqsood Ahmed7-Dec-05 1:46

Maqsood Ahmed

7-Dec-05 1:46

foreach(object obj in hashTable.Values)<br />
{<br />
   //Print obj<br />
}

HTH, Cheers Smile | :)

Maqsood Ahmed - MCAD.net
Kolachi Advanced Technologies
http://www.kolachi.net

Re: To access and print the values in Hashtable?

MudkiSekhon7-Dec-05 2:14

MudkiSekhon

7-Dec-05 2:14

Thanks Maqsood for ur reply. But when printing , it alos prints System.Collections.Hashtable, that is the type...........

Thanks,
Sandeep
+919891027854

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