Problems with serial port control in C# [modified] - C# Discussion Boards

Re: get native resolution of LCD display

harold aptroot3-Feb-09 11:49

3-Feb-09 11:49

DirectX lets you enumerate valid display modes (see EnumDisplayModes[^]). Chances are that the highest one will be the native resolution - but I can't guarantee that.

Re: get native resolution of LCD display

Expert Coming3-Feb-09 16:45

Expert Coming

3-Feb-09 16:45

Why would you want it to adapt to the screen and not the resolution? It will look stretched/smashed if you try to do that...

The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo

Re: get native resolution of LCD display

LordZoster3-Feb-09 20:50

LordZoster

3-Feb-09 20:50

This is the interesting point Smile | :)

The user will not have access to Windows settings (mandatory design).
If he would attach a non-4:3 LCD to the machine, and Windows shouldn't adapt automatically to the native resolution, I should instead.
I agree that is a driver matter. Thanks for the replies.

about one Registry problem

Seraph_summer3-Feb-09 9:02

Seraph_summer

3-Feb-09 9:02

I try to do following:

RegistryKey RegKey = Registry.ClassesRoot.CreateSubKey(".xxx");

but it gives the message "the access of registry key "HKEY_CLASSES_ROOT\.xxx" is denied",

what does mean?

thanks

Re: about one Registry problem

EliottA3-Feb-09 9:04

EliottA

3-Feb-09 9:04

It means you don't have access to that registry key. I was able to figure that out by reading this...

Seraph_summer wrote:
"the access of registry key "HKEY_CLASSES_ROOT\.xxx" is denied"

Re: about one Registry problem

jeffwask3-Feb-09 9:37

jeffwask

3-Feb-09 9:37

It is most likely a permissions issue. Review the permissions on the registry key and hive.

Re: about one Registry problem

Seraph_summer3-Feb-09 9:48

Seraph_summer

3-Feb-09 9:48

I have known the problem, because I am using vista and I have to run VS as administrator!!

Problems with serial port control in C# [modified]

Cosmin Ciuraru3-Feb-09 8:01

Cosmin Ciuraru

3-Feb-09 8:01

Hello,

I'm using the serial port control from .net 2.0 and an usb to serial(3 wires configuration) converter in order to communicate with a logic analyzer. The device makes a print screen, and I query it to send it over serial to my pc. If the image displayed on the device contains more information, such as fonts and various colors, I have some problems. Here is my scenario:
-The device sends the image in pcl format.
-I receive the bytes in the datareceived event and write them with a binary writer on to the disk. I've tried writing each time the event fired, as well as setting a threshold of 50000 (the image is about 30000) and a timer (I thought the operation with the disk made me lose some data) in order to write the entire buffer, after the transfer is made.
-I can appreciate if the data is correct by using a pcl to image converter, which displays the original image.
-For certain images, the converter fails to display the source, in that parses the image on 2 pages, an it displays a string of characters that it couldn't interpret from the file. (it displays it on the image).
-I know that the image is sent correctly because I used matlab to make the transfer, and it got the image ok.
-i've started modifying this solution:
http://msmvps.com/blogs/coad/archive/2005/03/23/SerialPort-_2800_RS_2D00_232-Serial-COM-Port_2900_-in-C_2300_-.NET.aspx[^]

I've read there are some problems with the serial port control, and used this to avoid it:
http://msdn.microsoft.com/en-us/magazine/cc301786.aspx[^].

I've written a small c program, which I wanted to include in my c# code, it sends the command, but when I poll portAddress + 5(the status register), it returns 0 or 0x60, but never a 0x01.

I've written a c++ (createfile,readfile) to communicate with the device, the device does not respond.

Yes,this is a school project, yes I'm on a tight schedule and i really need some help. Thank you.

P.S.I'm not doing it in matlab, because I want to continue extending the program in order to provide a virtual lab, accessible via internet.

For code requests, situations I have missed to ilustrate, please ask and debate.

My later edit: the pc sees the serial port on com12, due to the adapter and it seems that in c++ i have to write \\\\.\\com12 if com>10 as parameter for createfile. In c#, getports() return the com12 though.

Cosmin.

modified on Tuesday, February 3, 2009 2:19 PM

Re: Problems with serial port control in C#

Cosmin Ciuraru4-Feb-09 4:59

Cosmin Ciuraru

4-Feb-09 4:59

I've solved the problem. I found out that the issue was in the protocol I was using. As I've said before, I was using a 3 wire serial setup for communicating, and the device accepted xonxoff protocol or none. I thought it was best to use xonxoff, but it seems that the pc misinterprets some characters and I changed it over to none. Although there's no control over the communication, the image is sent correctly now.

Cosmin.

What's wrong with this code?

Juvil John3-Feb-09 7:10

Juvil John

3-Feb-09 7:10

private delegate void _Post_Result(object[] data);

private void Post_Result(object[] data)
{
    if (lvThreads.InvokeRequired)
    {
        //This means that calling was accessed in separate thread
        _Post_Result upd = new _Post_Result(Post_Result);
        //this.lvThreads.Invoke(upd, data);
        this.lvThreads.Invoke(upd, new object[] { data });
    }
    else
    {
        //This means that calling of lvThreads is in main thread
        ListViewItem lvitem = (ListViewItem)data[0];
        this.lvThreads.Items[lvitem.Text].SubItems[1].Text = Convert.ToString(data[1]);
    }
}

I am getting this error "Parameter count mismatch" in the bold line...

Re: What's wrong with this code?

Kristian Sixhøj3-Feb-09 7:15

Kristian Sixhøj

3-Feb-09 7:15

don234564 wrote:
Parameter count mismatch

The error message always tells you the problem.
In this case, the number of parameters passed to the method is incorrect.
I don't know that method you're using, though, so I can't help you with that.

Kristian Sixhoej
"You can't undo the past... but you can certainly not repeat it." - Bruce Willis

Re: What's wrong with this code?

Rob Philpott3-Feb-09 7:17

Rob Philpott

3-Feb-09 7:17

Looks alright to me, I have to say. What is lvThreads?

Regards,
Rob Philpott.

Re: What's wrong with this code? [modified]

Luc Pattyn3-Feb-09 7:20

Luc Pattyn

3-Feb-09 7:20

don234564 wrote:
new object[] { data }

data already is an object array, why create a new array holding this one array as its sole element?

BTW: there is no need to create the delegate over and over again, you can move the statement
_Post_Result upd = new _Post_Result(Post_Result); elsewhere (e.g. as a class member) and execute it only once.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets

modified on Friday, June 10, 2011 11:38 AM

Re: What's wrong with this code?

Rob Philpott3-Feb-09 7:24

Rob Philpott

3-Feb-09 7:24

I think I must be missing something here - I can't see what's wrong with the code.

You create a new array holding the array as it's only element because that's the signature Control.Invoke expects. The array represents individual parameters, the fact there's only one and that it is itself an array is irrelevant.

But then, I think it should work so don't listen to me... D'Oh! | :doh:

Regards,
Rob Philpott.

Re: What's wrong with this code?

Juvil John3-Feb-09 7:38

Juvil John

3-Feb-09 7:38

im confused either where im getting this wrong... anyone can try the code?

Re: What's wrong with this code?

Juvil John3-Feb-09 7:41

Juvil John

3-Feb-09 7:41

yes data is already an array. parameter in control.invoke refers to the number of parameters you pass this through in that case "upd" which is refered to Post_Results which contains only 1 param so thats the reason why you have to place the data into another array.

Re: What's wrong with this code?

Wendelius3-Feb-09 8:15

Wendelius

3-Feb-09 8:15

Never run into this situation but could you try what happens if you define the delegate as public.

Also as others pointed out, I don't see a reason to create a new array.

The need to optimize rises from a bad design.My articles[^]

Re: What's wrong with this code?

Jon Rista3-Feb-09 10:36

Jon Rista

3-Feb-09 10:36

You have to create a new array because the outer array is the array of parameters TO PASS TO the called function, and the inner array IS the first parameter OF the called function. Since the called function takes an array as its first parameter...

Re: What's wrong with this code?

Wendelius3-Feb-09 11:05

Wendelius

3-Feb-09 11:05

Wouldn't casting work in this situation?
this.lvThreads.Invoke(upd, (object[])data);

The need to optimize rises from a bad design.My articles[^]

Re: What's wrong with this code?

martin_hughes3-Feb-09 8:41

martin_hughes

3-Feb-09 8:41

I suspect that the exception is not being thrown here:

don234564 wrote:
this.lvThreads.Invoke(upd, new object[] { data });

but somewhere here:

don234564 wrote:
ListViewItem lvitem = (ListViewItem)data[0]; this.lvThreads.Items[lvitem.Text].SubItems[1].Text = Convert.ToString(data[1]);

And what you're actually experiencing is one of the whole panoply of wonders associated with multi-threading.

My Bookmarks

I clicked the link. In an instant I was transported 15 years back in time.

Re: What's wrong with this code?

Juvil John3-Feb-09 8:50

Juvil John

3-Feb-09 8:50

I have not actually found out whats really causing this but I re design my code and somehow got this to work.

here's what i'm using now.

private delegate void _Post_Result(object data);

       private void Post_Result(object data)
       {
           if (lvThreads.InvokeRequired)
           {
               //This means that calling was accessed in separate thread
               upd = new _Post_Result(Post_Result);
               this.lvThreads.Invoke(upd, new object[] { data });
           }
           else
           {
               //This means that calling of lvThreads is in main thread
               lvitem = (ListViewItem)data;
               this.lvThreads.Items[lvitem.Index].SubItems[1].Text =
                   Convert.ToString(Convert.ToInt32(lvitem.SubItems[1].Text) + 1);
           }
       }

help

Member 46759863-Feb-09 6:54

Member 4675986

3-Feb-09 6:54

speech to text using neural networks in c#
any one knows about that plz send

Re: help

EliottA3-Feb-09 6:56

EliottA

3-Feb-09 6:56

You won't get that type of help here. If you get stuck on a specific problem, then come back. These types of posts will be scorned, so try not to do that. If you want code with no work whatsoever, go to this site[^].

Re: help

musefan3-Feb-09 6:59

musefan

3-Feb-09 6:59

I 'Scorn' upon your post Laugh | :laugh:

My opinion is... If someone has already posted an answer, dont post the SAME answer

Re: help

EliottA3-Feb-09 7:04

EliottA

3-Feb-09 7:04

Lol, 5 for being funny, 1 for making fun of me. 5 for the smiley. 5+1+5/3 = 3.66~ rounded up to 5.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.