C# Discussion Boards - CodeProject

BlackDice21-Jun-06 7:38

BlackDice

21-Jun-06 7:38

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BlackDice

led mike21-Jun-06 7:48

led mike

21-Jun-06 7:48

DirectShow does all the rendering of the video media correct? Even if you got the handle to the device context it is using and try to draw on it you just have a race condition (last painter wins) don't you?

eyale22-Jun-06 8:08

eyale

22-Jun-06 8:08

so what is the best way to do it?

Instantiate Bitmap object from unmanaged memory/ Memory Allocation ? [modified]

led mike22-Jun-06 9:42

led mike

22-Jun-06 9:42

I suppose you could z-order windows so your new shapes are actually in a different window on top of the window that the video is renedered in. Just wild thoughts... I have no experience doing anything with DirectShow.

Another approach could be altering the media stream content to contain the new shapes.

Florian Storck21-Jun-06 5:45

Florian Storck

21-Jun-06 5:45

Hi,

I'm struggling with the following problem:

I have a large unmanaged buffer, allocated with VirtualAlloc for performmance reasons. I use this buffer to load prepared bitmap image data into it.

For displaying, I tried to instantiate a bitmap object the following way:

<br />
<br />
// ButPtrStart points to an offset in my linear, unmanaged buffer.<br />
<br />
   Bitmap bmp  = new Bitmap(Width, Height, Width * 4,                                                 System.Drawing.Imaging.PixelFormat.Format32bppPArgb,                                                 new IntPtr((void*)BufPtrStart.ToPointer());<br />
<br />

Usually, as I understood, creating a bitmap this way should not allocate any memory through the GC. But in my tests I found that memory is allocated anyway. Interestingly it isn't the size the bitmap has uncompressed in memory, but it is a significant amount.

Does anybody have similar Effects and knows the cause ?

Bye,
Florian

-- modified at 11:45 Wednesday 21st June, 2006

checkinf for USB connection

donkaiser21-Jun-06 4:20

donkaiser

21-Jun-06 4:20

I'm writing an app that will talk to a USB device. I wonder how can I check that i have lost my USB connection just like in windows.

Donkaiser

Error:- Could not access 'CDO.Message' object.

nachisaravanan21-Jun-06 3:22

nachisaravanan

21-Jun-06 3:22

Hi,
I tried to send mail from c# windows application but i am unable to send the mail.i am getting the following error.

An unhandled exception of type 'System.Web.HttpException' occurred in system.web.dll

Additional information: Could not access 'CDO.Message' object.

The code i wrote is

System.Web.Mail.MailMessage mailMsg = new MailMessage();
mailMsg.From ="chand.p@icinfotech.com";
mailMsg.To = "chand.p@icinfotech.com";
mailMsg.Priority = MailPriority.High;
mailMsg.Subject = subject;
mailMsg.Body = body;
mailMsg.BodyFormat = System.Web.Mail.MailFormat.Html;
MailAttachment sFile = new MailAttachment(attachment);
mailMsg.Attachments.Add(sFile);
SmtpMail.SmtpServer = "127.0.0.1";
SmtpMail.Send(mailMsg);

reply me if any one know the solution for this problem.

Not Active21-Jun-06 4:24

21-Jun-06 4:24

Unless your local machine is the mail server you will need to set SmtpServer to a valid address, maybe something like mail.mycompany.com or 234.10.44.20

nachisaravanan21-Jun-06 4:34

nachisaravanan

21-Jun-06 4:34

hi thanks for replying me.
i have used my company mail server but i am receiving the same error.i tried this in vs2003 but in vs2005 it is working fine.

Not Active21-Jun-06 4:38

21-Jun-06 4:38

If you are using VS2005 you should use the System.Net.Mail namespace, System.Web.Mail has been deprecated.

nachisaravanan21-Jun-06 4:50

nachisaravanan

21-Jun-06 4:50

Yes,i used System.Net.Mail namespace in vs2005.Do you have any alternate solution for my problem?if any,please kindly reply.

Not Active21-Jun-06 4:57

C# web services parameter encoding problem

21-Jun-06 4:57

I don't realy see that you have a problem. It works with VS2005 but not with VS2003, so the obvious answer is to use what works. Is there a reason why it needs to work using .NET 1.1?

chandru__21-Jun-06 2:57

chandru__

21-Jun-06 2:57

Hi,
I have my web services in c#
a VC client makes a call to this Web service -> Web Method
The signature of the Web method looks like

[Web Method]
public void retrieveData(string SampleString){}

Now Say the client sends "VC+" as the sample string to the above web method
In the web method, the samplestring is received as "VC " and not "VC+"
( The + char is getting replaced with space character )

how to solve this problem?

thanks in advance
chandru

Controlled looping thru ArrayList?

kbalias21-Jun-06 2:43

kbalias

21-Jun-06 2:43

Hi I have an ArrayList of objects and I want to loop thru the ArrayList. For each object I want to give the user options of how to configure/change values in the object.
So basically what I would like to happen is that for each of the objects in the ArrayList the system must wait for the user to make changes and press a button to "Proceed". Once the button is clicked the loop must continue to the next object. I cannot use a MessageBox because I have quite a few RadioButtons that give the user options for configuring the objects.

Any suggestions of how to go about this? Perhaps using threading?

Thanks

Kobus

Re: Controlled looping thru ArrayList? [modified]

gnjunge21-Jun-06 2:54

gnjunge

21-Jun-06 2:54

try maybe the following:

1) Add a Windows Form to your project where you add all the different options. The fast and dirty way says that you make all your textboxes, radiobuttons etc not private but internal or public. Lets call the formfor our purpose frmEditor
2) Now in the area where you want to loop over your array to the following:

for (int i = 0; i < myArrayList.Count; i++) {
     mycustomobject co = (mycustomobject ) myArrayList[i] ;
     //Create new frmEditor
     frmEditor f = new frmEditor();
     //Fill our form with the values from our object from the arraylist
     f.txtValue.Text = co.SomeValue;
     f.chkCheckBox.Checked = co.SomeBoolean;
 
     //Show the frmEditor in a modal window
     f.ShowModal();

     //Put the changes back into our customobject
     co.SomeValue = f.txtValue.Text;
     co.SomeBoolean = f.chkCheckBox.Checked;


} //and continue to next item in arraylist.

I wrote this code without having VS in front of me, so just check the syntax.

-- modified at 8:54 Wednesday 21st June, 2006

Re: Controlled looping thru ArrayList?

Not Active21-Jun-06 3:00

Re: Controlled looping thru ArrayList?

21-Jun-06 3:00

gnjunge wrote:
frmEditor f = new frmEditor();

For performance reasons I would place this line before beginning the for loop.

gnjunge21-Jun-06 3:08

gnjunge

21-Jun-06 3:08

Totally right.

Re: Controlled looping thru ArrayList?

Not Active21-Jun-06 2:57