Re: How can I copy a block of memory? - C# Discussion Boards

Onchange event is not triggering events on text elements in c#

9-Aug-08 4:43

Set the MaxLength property of your textbox to some value (like 200), then in the TextChanged event of the textbox you can write some information into a label if you like:

private void textBox1_TextChanged(object sender, EventArgs e)
{
	label1.Text = string.Format("You use {0} out of {1} characters", textBox1.Text.Length, textBox1.MaxLength);
}

regards

modified 12-Sep-18 21:01pm.

Mobile programming

ali zaidi9-Aug-08 3:25

ali zaidi

9-Aug-08 3:25

Please tell me the link for learning the mobile programming

Re: Mobile programming

mr.mohsen9-Aug-08 6:09

mr.mohsen

9-Aug-08 6:09

try to search in google
there are a lot of good results on a few first pages...

nobody help you...
you have to help you yourself
and this is success way.

Nupur2069-Aug-08 3:03

Nupur206

9-Aug-08 3:03

Hi,
I want to trigger an event every time I type something in a textbox using Onchange events.
The code im using is

IHTMLElementCollection elcol1 = doc.getElementsByTagName("input");

foreach (IHTMLInputTextElement iel in elcol1)
{

HTMLInputElementClass ee = iel as HTMLInputElementClass;

if (ee.value!= null && ee.IHTMLInputElement_type.Equals("text"))
{

ee.HTMLInputTextElementEvents2_Event_onChange += new HTMLInputTextElementEvents2_onChangeEventHandler(ee_HTMLInputTextElementEvents2_Event_onchange);

}

}

For every text element it enters into the "if" block but the "ee_HTMLInputTextElementEvents2_Event_onchange" function is not called. How can i trigger the event? Please help!

How can I copy a block of memory?

CopperCircle9-Aug-08 2:22

9-Aug-08 2:22

Hi, I am trying to use the third party VideoCog componet with C# and I need to copy a image frame? Videocog drops the frame into an rgb array in memory and I can then fast process the pixels using pointers.
How can I create another copy of the frame from memory so that I can also access that via another pointer?

Thanks...

 1.
    private void videoCogControl1_FrameReady(double SampleTime, IntPtr pBuffer,
 2.
                                             int BufferSize, int Width, int Height)
 3.
         {
 4.
              unsafe
 5.
              {
 6.
                   byte* p = (byte*)(void*)pBuffer;
 7.
                   int nWidth = Width * 3;
 8.
                   for (int y = 0; y < Height; y++)
 9.
                   {
10.
                        for (int x = 0; x < nWidth; x++)
11.
                        {
12.
                            p[0] = (byte)(255 - p[0]);
13.
                            p++;
14.
                        }
15.
                   }
16.
               }
17.
         }

User 66589-Aug-08 2:29

9-Aug-08 2:29

Have you tried the Marshal.Copy[^] method from the interop namespace?

regards

modified 12-Sep-18 21:01pm.

CopperCircle9-Aug-08 2:39

9-Aug-08 2:39

Thanks for the reply, I am very new to C# and I am just working off the Videocog tutorials, do you have an example of how Marshal.Copy works?

Guffa9-Aug-08 7:53

9-Aug-08 7:53

The documentation has.

MSDN Library: Marshal.Copy method[^]

Despite everything, the person most likely to be fooling you next is yourself.

CopperCircle9-Aug-08 11:47

9-Aug-08 11:47

Thanks, I got it to work, but there must be an faster/easyer way to copy a block of memory?

This is what I did to get it to work with Marshal.ReadByte, it gives me p2 which I can use on the copied image:

byte[] bytes = new byte[BufferSize];
for (int i = 0; i < BufferSize; i++)
    bytes[i] = Marshal.ReadByte(pBuffer, i);

fixed (byte* pTmp = bytes)
{
    System.IntPtr pBuffer2 = new IntPtr((void*)pTmp);
    byte* p2 = (byte*)(void*)pBuffer2;
}

Guffa9-Aug-08 22:17

9-Aug-08 22:17

Use Marshal.Copy instead of Marshal.ReadByte. Now you are making a method call for every byte that you copy, that is bound to be slow.

Why are you converting the pointer to an IntPtr value, then back to a pointer? Just copy the pointer:

fixed (byte* pTmp = bytes) {
   byte* p2 = pTmp;
}

Despite everything, the person most likely to be fooling you next is yourself.

CopperCircle10-Aug-08 0:21

10-Aug-08 0:21

Thanks, I tried to use Marshal.Copy but I could not get it to work, could you please show how to implement it?

Cheers,

#realJSOP10-Aug-08 1:19

#realJSOP

10-Aug-08 1:19

Have you tried the C++ forum?

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

CopperCircle10-Aug-08 2:32

10-Aug-08 2:32

Hi, I found a very quick method in the end using RtlMoveMemory:

[DllImport("kernel32")]
public static extern void RtlMoveMemory(IntPtr dest, IntPtr src, int len);

System.IntPtr pBuffer2 = Marshal.AllocHGlobal(BufferSize); //Assign unmanaged memory
RtlMoveMemory(pBuffer2, pBuffer, BufferSize); //Copy memory
byte* p2 = (byte*)(void*)pBuffer2;
// Use p2 to access image pixels
Marshal.FreeHGlobal(pBuffer2); //Free unmanaged memory

Thanks, for the help and hope this helps some one else.

send mail using C#

sobhaniir9-Aug-08 0:41

sobhaniir

9-Aug-08 0:41

hi i want to send mail using C# but i cant
this is my code:

MailAddress from = new MailAddress("negin_sarkhosh22@yahoo.com", ":: safir187.com ::");
MailAddress to = new MailAddress("sara_sarakhanom22@yahoo.com", ":: tnz187 ::");
MailMessage message = new MailMessage(from, to);

message.Subject = "Safir187.com is updated!";
message.IsBodyHtml = true;
message.Priority = MailPriority.High;
message.Body = "wedqwe";

SmtpClient client = new SmtpClient("localhost");
client.Send(message);
please tell me my mistake
thanks

Guffa9-Aug-08 0:50

9-Aug-08 0:50

What does "cant" really mean? Does the code compile? What happens when you run it? Do you get an error message?

Does the server have an active SMTP service?

Does your ISP allow sending mails through their system? This is sometimes disallowed to prevent spamming. In that case you have to use the SMTP server that they provide.

Despite everything, the person most likely to be fooling you next is yourself.

User 66589-Aug-08 1:18

9-Aug-08 1:18

Why do people vote this as an unhelpful answer? I'll vote this one as helpful for justice.

modified 12-Sep-18 21:01pm.

Paul Conrad9-Aug-08 6:15

Paul Conrad

9-Aug-08 6:15

I think the OP voted it down because it wasn't the answer HE was looking for.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

User 66589-Aug-08 8:24

9-Aug-08 8:24

Yeah, seems to be pretty common these days Sigh | :sigh:

modified 12-Sep-18 21:01pm.

Paul Conrad9-Aug-08 8:49

Paul Conrad

9-Aug-08 8:49

Yeah, over in the ASP.NET forum somebody vote me down just because I told them to get a book or two on programming in ASP.NET since they were a beginner asking an incredibly trivial question.

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Guffa9-Aug-08 10:10

9-Aug-08 10:10

Well, if people don't want to be part of the process of helping them, what can you do...

It's quite common that people don't know what to ask for, how to ask for it, or what information to provide when asking for it. That's all right if they just respond when asked for clarification or more information. If they don't, the thread is not going to go anywhere. At least not in the direction of helping them...

Despite everything, the person most likely to be fooling you next is yourself.

Wendelius9-Aug-08 2:35

Wendelius

9-Aug-08 2:35

As the previous post pointed out you should describe your problem better.

Just based on the code I noticed that you are using localhost as the mail server. Is this correct, in other words do you have a smtp mail server running on your client?

Mika