C# Discussion Boards - CodeProject

Re: how to see datagrid print printpriview in c# windows.

Henry Minute17-Sep-09 2:48

Henry Minute

17-Sep-09 2:48

The part of your code that is giving the error is

e.Graphics.DrawString(<big>this.dataGridView1(i, j)</big> + " ", f, b, j * 5, i * 5);

You are using this.dataGridView1(i, j) as if there were a DataGridView method that takes a row index and a column index and returns the value stored there. There is no such method.

You need to use square brackets '[]'.
Like this:

e.Graphics.DrawString(<big>this.dataGridView1[i, j]</big> + " ", f, b, j * 5, i * 5);

but as you have it you will get incorrect results, as it is dgrid[colindex, rowindex] and you are using dgrid[rowindex, colindex]

You can use something like

e.Graphics.DrawString(this.dataGridView1.Rows[i].Cells[j].Value.ToString() + " ", f, b, j * 5, i * 5);

so that you do not get confused about cols and rows.

Note also the .Value.ToString() in the last bit of code, you may, or may not need to use it in your code.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Windows Service Credentials

Sangioo17-Sep-09 2:09

Sangioo

17-Sep-09 2:09

Hi,

I developped a windows service and I'd like to retrieve its own credentials (the "Run As" credentials, not the WindowsIdentity). Is it possible?

If yes, can those credentials be converted to NetworkCredentials? (for webservices calls)

thanks

Context menu for a text box.

Pavan Navali17-Sep-09 1:45

Pavan Navali

17-Sep-09 1:45

Hi,

I have a scenario where I'm validating the data in a text box for special character.

The user can enter the data through keyboard, Copy & paste data using Ctrl+C and Ctrl+V from keyboard, or right click and paste using mouse.

I have to validate the data before it is pasted to the textbox. I'm validating the data for first two scenarios, i.e., validating while user enteres the data, or pasting the data using Ctrl+C and Ctrl+V from keyboard.

I'm not able to find any events which triggers contextmenu_paste_click event.

I'm not allowed to create a context menu for the textbox, that is I have to use the default context menu and I cannot create a new class which inherits the textBox class.

How can I implement this?

Any suggestion is appreciated.

Thank you.

Re: Context menu for a text box.

Not Active17-Sep-09 1:49

Not Active

17-Sep-09 1:49

Handle the textchange event, it will be triggered by the paste

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Re: Context menu for a text box.

Pavan Navali17-Sep-09 18:26

Pavan Navali

17-Sep-09 18:26

Thank you Mark Nischalke for your suggestion.

It works as far as validation is concerned, but doesn't serve my requirement completely, because for the following reason:

suppose the user pastes some text and it he tries to add some thing to same text, then the onTextchanged event is triggered and copies the same text again to the text box. and for other events like cut this event is triggered.

So, I would like to is there any way to access the paste_click event in the default context menu.

Re: Context menu for a text box.

Not Active18-Sep-09 1:43

Not Active

18-Sep-09 1:43

Pavan Navali wrote:
onTextchanged event is triggered and copies the same text again to the text box

Why would it do this?

only two letters away from being an asset

disabled hyperlink and write arrow cursor

Idoshhh17-Sep-09 1:17

Idoshhh

17-Sep-09 1:17

Hello,
i have a problem using IE7.

i have 4 text button (hyperLink) that should working after the user logged in with user and password.
the problem is that: if the hyperlink is disabled the mouse arrow is pointer and not write arrow as it should be in IE7, but in IE8 it's ok.
what can i do using css to fix it ???

10x for all.
Ido.

Re: disabled hyperlink and write arrow cursor

Not Active17-Sep-09 1:53

Not Active

17-Sep-09 1:53

Idosha wrote:
what can i do using css to fix it ???

First, choose the correct forum. This question would be better posed in the ASP.NET or Web Development forums, it has nothing to do with C#.

Change the CSS on those elements to an appropriate cursor setting.

only two letters away from being an asset

measure received data/s for an udp multicast address [modified]

collapo17-Sep-09 1:08

collapo

17-Sep-09 1:08

Hi
I'm trying to measure data from a multicast udp address.

To do this, i use a socket added to multicastgroup and this code:

while (!b)
{
    byte[] buffer = new byte[udpReceiver.Available];
    udpReceiver.Receive(buffer, 0, buffer.Length, SocketFlags.None, out err);
    if ((DateTime.Now - starttime).TotalSeconds < ((double)elem.timetowatch_ms / 1000))
    {
        newvalue += (ulong)buffer.Length;
    }
    else
    {
        newvalue += (ulong)buffer.Length;
        receivedByteNumber = ((Convert.ToUInt64((double)newvalue / (DateTime.Now - starttime).TotalSeconds)) / 128);
        newvalue = 0;
        starttime = DateTime.Now;
        b = true;
    }
 }

my problem that it is using about 50% of cpu time and if i place it in a thread
it shows less data (~4000kbits/sec) than if it is placed on a main thread (~7000) - possibly because of system time management, but i'm unsure.

Any better suggestion on data measuring on multicast udp with less cpu and regardless of this threadproblem?

Thanks in advance:
Collapo

modified on Thursday, September 17, 2009 7:14 AM

Re: measure received data/s for an udp multicast address

Luc Pattyn17-Sep-09 2:32

Luc Pattyn

17-Sep-09 2:32

I see you have a dual-core system. Laugh | :laugh:

The code you created is basically a polling loop: you are repeating the same thing over and over, without waiting for anything, so the core that executes it will spin around as fast as it can: assume Available is zero, Receive sees zero-length buffer, returns immediately, timespan is very small, loop iteration done, on to the next loop wasting even more cycles.

You need to fix this in one of several ways:
- include a Thread.Sleep(x) in your code, where x>0; say x=33; that way your code will run at most 30 times per second, and your CPU usage will go way down. However you now may miss some packets.
- use a fixed-length buffer, say 2048B; that way Receive will have to wait for data; drawback is it will not report smaller packets until the buffer gets full, so there is a lag.
- use asynchronous I/O, look for BeginReceive. IMO that would be the correct way.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Local announcement (Antwerp region): Lange Wapper? Neen!

Re: measure received data/s for an udp multicast address

collapo17-Sep-09 3:16

collapo

17-Sep-09 3:16

Thanks Luc!

Yeapp, it seem reasonable...

- Thread.Sleep(x) is loosing too much packets, so it won't be good for me i guess

- fixed buffer might be good, I'll try it in a short time

- I'll try BeginReceive as well, though i am not familiar with callbacks, so i would be really thankful if you could enlighten me on that

collapo

Re: measure received data/s for an udp multicast address

Luc Pattyn17-Sep-09 3:23

Luc Pattyn

17-Sep-09 3:23

collapo wrote:
enlighten me

read the documentation, it probably holds an example.
and learn to use Google, it knows more than 6 million CPians combined.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Local announcement (Antwerp region): Lange Wapper? Neen!

Re: measure received data/s for an udp multicast address

collapo17-Sep-09 4:17

collapo

17-Sep-09 4:17

Point there...

thanks

API in C#

vahid_erad17-Sep-09 0:54

vahid_erad

17-Sep-09 0:54

i'm working C#
I don,t know API very well
please help me how can i learn API in C#?
Also, i,m very thankful if introduce me some good book about API

Re: API in C#

Calla17-Sep-09 1:11

Calla

17-Sep-09 1:11

There are multiple tutorials and introductions to .NET and C# online. Google the .NET area you want to learn about..

Regarding books, I find "Programming C#" by Jesse Liberty from O'Reilly to be pretty good.

Re: API in C#

Arun Jacob17-Sep-09 1:21

Arun Jacob

17-Sep-09 1:21

Try Google and MSDN. Smile | :)

Arun Jacob
http://codepronet.blogspot.com/

Re: API in C#

Harvey Saayman17-Sep-09 1:52

Harvey Saayman

17-Sep-09 1:52

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Software Developer
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you.suck = (you.Occupation == jobTitles.Programmer && you.Passion != Programming)
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Omitting HTML footer ?

Mohammad Dayyan17-Sep-09 0:47

Mohammad Dayyan

17-Sep-09 0:47

Hi.
I've used a WebBrowser to print a HTML file , I want to omit footer[^] and header[^] of the Print result.
Could you guide me how I can do it ?

Re: Omitting HTML footer ?

Not Active17-Sep-09 1:45

Not Active

17-Sep-09 1:45

Construct a version of the page with these elements and use it for the print

only two letters away from being an asset

Re: Omitting HTML footer ?

Mohammad Dayyan17-Sep-09 2:12

Mohammad Dayyan

17-Sep-09 2:12

Thanks, I couldn't understand well, could you please describe it more ?

Re: Omitting HTML footer ?

Not Active17-Sep-09 2:34

Not Active

17-Sep-09 2:34

What don't you understand about having a version of the page you are rendering without the header and footer elements? OMG | :OMG:

Alternatively, use the CSS media type to control what is available for printing
http://www.w3schools.com/css/css_mediatypes.asp[^]

only two letters away from being an asset

TCP Socket issue

Harvey Saayman17-Sep-09 0:43

Harvey Saayman

17-Sep-09 0:43

Hey guys

I'm having some troubles communicating to an external device over the network.

Here's my code

TcpClient BadgerConnection = new TcpClient();
BadgerConnection.Connect(IPAddress.Parse("10.0.0.100"), 1111);

if (BadgerConnection.Connected)
{
    StreamWriter sw = new StreamWriter(BadgerConnection.GetStream());
    sw.AutoFlush = true;

    char[] Buffer = new char[]
    {
        (char)161, // Start Packet
        (char)15,  // Terminal ID
        (char)89,  // Command
        (char)1,   // Amount of arguments to follow
        (char)89,  // Arg 1
        (char)3,   // End Packet
        (char)102  // Checksum = Sum of all chars mod 256
    };

    sw.Write(Buffer);
}

So obviously this isn't working, cause if it did I wouldn't be here Poke tongue | ;-P

What I did was get a packet sniffer and attached it to my program before connecting to the external device.

Here was the result in hex:

C2 A1 0F 59 01 59 03 66

Here's what I intended to send in hex:

A1 0F 59 01 59 03 66

There's an extra character showing up... C2 or rather 194.
Can someone please explain to me why and how can I stop it from sending the extra character?

Thanks

Re: TCP Socket issue

harold aptroot17-Sep-09 3:17

harold aptroot

17-Sep-09 3:17

Odd, I would have expected an UTF-8 BOM, but C2.. that's something else..

Anyway, why are you using chars at all? Why not just bytes?

If you send them as bytes, that should probably get rid of that C2 (at least I never noticed extraneous C2's while sending plain bytes)

Re: TCP Socket issue

Harvey Saayman17-Sep-09 3:26

Harvey Saayman

17-Sep-09 3:26

I tried sending just bytes bytes like so

TcpClient BadgerConnection = new TcpClient();
BadgerConnection.Connect(IPAddress.Parse("10.0.0.100"), 1111);
if (BadgerConnection.Connected)
{
    StreamWriter sw = new StreamWriter(BadgerConnection.GetStream());
    sw.AutoFlush = true;

    byte[] Buffer = new byte[]
    {
        161,
        15,
        89,
        1,
        89,
        3,
        102
    };   
    sw.Write(Buffer);
}

And the sniffer picked up this:

00000000: (TCP/IP) Sending Packet, 17.09.2009 15:24:37.684
BadgerTest.vshost.exe (2188)
0.0.0.0:1200 ® 10.0.0.100:1111
Size: 13 bytes
 53 79 73 74 65 6D 2E 42 79 74 65 5B 5D            System.Byte[]

Re: TCP Socket issue

harold aptroot17-Sep-09 3:30

harold aptroot

17-Sep-09 3:30

It seems to be the StreamWriter's fault, what if you send them "normally"?
eg

TcpClient BadgerConnection = new TcpClient();
BadgerConnection.Connect(IPAddress.Parse("10.0.0.100"), 1111);
if (BadgerConnection.Connected)
{
    byte[] Buffer = new byte[]
    {
        161,
        15,
        89,
        1,
        89,
        3,
        102
    };
    NetworkStream ns = BadgerConnection.GetStream();
    ns.Write(Buffer, 0, Buffer.Length);
    ns.Flush();
}

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