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Your problem description is way too vague to get useful suggestions.
A couple of points:
1. why are you calling sp.DiscardInBuffer() ?
all the data that you get by executing Read operations is removed from the serial stream automatically, however if any data comes in while your handler is running will be thrown away, more specifically anything that comes in after sp.BytesToRead is not read and discarded.
2. you are ignoring the return value of sp.Read().
this method will not always return the number of bytes requested: when fewer are available, fewer will be returned!
3. you should not switch on the number of bytes read, as sp.BytesToRead may return just any value: it could be as low as 3, or as high as 300, all depending on what your peripheral is sending and how fast Windows is dealing with it.
4. you need to see the incoming data as chunks of one big stream, and provide code to detect the messages in that stream, then act on them. A serial port does not care about messages, it just sends bytes; so a DataReceived handler might get only half a message, or several messages, or ...
5. serial ports (and all interfaces to external devices) may temporarily fail, e.g. loose a few bytes; to get a reliable program your code must be capable of surviving such mishaps.
6. as I mentioned before, I would avoid DataReceived; collecting the incoming data, discovering the messages in the stream, and acting on them is way easier in a dedicated thread.
If you want someone to help, you need to provide lots of very specific information, such as:
1. description of the application. What is it about, is this a commercial peripheral (make & type), is the peripheral's software fixed?
2. is there a document that describes the protocol your peripheral is using on its serial port?
3. how often will a message be sent?
4. is there a master-slave relationship? i.e. send one command to get one response? that would be easy.
or is the peripheral free to send whatever and whenever it likes to do so?
etc.
All this info is needed to come up with a reliable approach.
Luc Pattyn [My Articles]
The Windows 11 taskbar is a disgrace; a third-party add-on is needed to reverse the deterioration. I decline such a downgrade.
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Hi Luc,
You are in the right, I'm wasn't clear and specific.
Hardware that I'm working:
DS-300 Electronic Racing Products.
photo of the product
specifications that I found
This hardware is an a scalextric race control. ( start, pause, stop, laps by slot, time of lap...). slot 1 have 1 sensor and slot 2 have another sensor, and when one of this sensors are actitated, the DS-300 sent the information since the COM PORT.
I checked and this is the information that send:
for example when I push start race I recevied this data:
e0 59 15 03 00 04 4c 3e a1 00 06 00 00 00 00 00 00 00 a6 00 eb
e0 5f 15 03 00 04 4c 00 a2 00 00 00 00 00 00 00 00 00 69 00 eb
e0 60 15 03 00 04 4c 00 a3 00 00 00 00 00 00 00 00 00 6b 00 eb
63 bytes:
byte 8 and 9 indicates that I pushed start.
byte 10 and 11 indicates the counter time, for example 6 minuts of race.
byte 12 and 13 --> number of lap
byte 15,16,17,18 --> time spend of complete the lap.
byte 20 and 21 --> ever the same 00 eb.
this is an example of data for 1 lap.
e0 60 15 03 00 04 4c 00 a3 00 00 00 00 00 00 00 00 00 6b 00 eb
21 byte:
byte 8 and 9 indicates that sensor of lap.
byte 10 and 11 indicates the slot 1 or 2.
byte 12 and 13 --> number of lap
byte 15,16,17,18 --> time spend of complete the lap.
byte 20 and 21 --> ever the same 00 eb.
This is when I force the stop of the race:
e0 61 15 03 00 04 4c 00 a7 00 00 00 00 00 00 00 00 00 70 00 eb
21 byte:
byte 8 and 9 indicates that I pushed start.
byte 10 and 11 indicates the counter time, for example 6 minuts of race.
byte 12 and 13 --> number of lap
byte 15,16,17,18 --> time spend of complete the lap.
byte 20 and 21 --> ever the same 00 eb.
this is the pause on:
e0 6d 15 03 00 04 4c 00 a5 00 00 00 00 00 00 00 00 00 7a 00 eb
21 byte:
byte 8 and 9 indicates that I pushed pause on.
byte 20 and 21 --> ever the same 00 eb.
pause off:
e0 6e 15 03 00 04 4c 00 a6 00 00 00 00 00 00 00 00 00 7c 00 eb
e0 6f 15 03 00 04 4c 00 a2 00 00 00 00 00 00 00 00 00 79 00 eb
e0 70 15 03 00 04 4c 00 a3 00 00 00 00 00 00 00 00 00 7b 00 eb
63 bytes:
byte 8 and 9 indicates that I pushed pause off.
byte 20 and 21 --> ever the same 00 eb.
finish time and finish the race:
e0 02 15 03 00 04 4c 00 c0 00 00 00 00 00 01 00 00 00 2b 00 eb
eb 03 15 03 00 04 4c 00 a4 00 00 00 00 00 00 00 00 00 0f 00 eb
42 bytes
byte 8 and 9 indicates that the race is finished.
byte 20 and 21 --> ever the same 00 eb.
What I would like:
I would like do a software that show all this data for the pilos are playing, because it's very important know how many laps are you having, the time of lap, etc...
I hope be clear and give you mor information.
Thanks in advance.
REgards
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using System;
using System.IO.Ports;
using System.Threading;
namespace ConsoleApp1 {
class PortDataReceived {
private static SerialPort sp;
private const string PORTNAME = "COM3";
private const int MSGLEN = 21;
public static void Main(string[] args) {
sp = openPort();
Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
if (sp!=null) sp.Close();
}
private static SerialPort openPort() {
try {
SerialPort port = new SerialPort(PORTNAME);
port.BaudRate = 56000;
port.Parity = Parity.None;
port.StopBits = StopBits.One;
port.DataBits = 8;
port.Handshake = Handshake.None;
port.RtsEnable = true;
port.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
port.Open();
output("serial port " + PORTNAME + "opened");
return port;
} catch(Exception exc) {
reportError("Error opening serial port (" + exc.Message + ")");
return null;
}
}
private static void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e) {
byte[] message = new byte[MSGLEN];
while (true) {
int count = sp.BytesToRead;
if (count == 0) return;
if (count >= MSGLEN) {
int got=sp.Read(message, 0, MSGLEN);
if (got == MSGLEN) {
processMessage(message);
} else {
reportError("Insufficient data bytes in DataReceivedHandler");
}
} else {
Thread.Sleep(100);
}
}
}
private static void processMessage(byte[] bb) {
int count = bb.Length;
string s = "Got message: (len="+count.ToString()+"): ";
foreach (byte b in bb) {
s += b.ToString("X2") + " ";
}
string comment = " ?";
if (count != MSGLEN) comment = " *** ERROR *** Bad length";
else if (bb[0] != 0xE0) comment = " *** ERROR *** Bad first byte";
else if (bb[8] == 0xA5 && bb[9] == 0x00) comment = " = Pause on";
else if (bb[8] == 0xA6 && bb[9] == 0x00) comment = " = Pause off";
output(s + comment);
}
private static void reportError(string message) {
output("Error: "+message);
}
private static void output(string text) {
Console.WriteLine(text);
}
}
}
I expect the above DataReceivedHandler method is OK, you would have to extend or replace the processMessage() method.
Luc Pattyn [My Articles]
The Windows 11 taskbar is a disgrace; a third-party add-on is needed to reverse the deterioration. I decline such a downgrade.
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Hi
I'm did a little test with you code and seems that is working fine, get the data and write the data like as we want.
During these days I'm goint to trying the code and I let you know.
Thanks a lot of you help.
Regards!!
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you're welcome.
Luc Pattyn [My Articles]
The Windows 11 taskbar is a disgrace; a third-party add-on is needed to reverse the deterioration. I decline such a downgrade.
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Has anyone been successful at attaching the Visual Studio remote debugger to any process in the Windows Sandbox VM?
I set my Debug Launch profile to start the application on a remote machine, and it successfully connects to the remote debugger process in the Sandbox, but when it tries to launch the application as configured in the launch profile, it says "Unable to start process <PATH to exe>".
The problem is that the path that it says it's trying to start is the path on my local machine, and not the path I have configured inside the launch profile to start on the remote machine.
Has anyone figured this out?
EDIT: I just realized that this problem is not only with the Sandbox VM, but with any VM on my machine. 
The difficult we do right away...
...the impossible takes slightly longer.
modified 5-Apr-24 18:05pm.
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I am attempting to write a short program in C# that deals with resistances (in electronics). I would like to be able to parse string values into floating point values. The string can be in the format like 100, 4.7K, 2.2M, or shorthand equivalents like 100, 4K7, 2M2. They should never have more than 3 digits, at least one of which is a whole number part (no more than 2 decimals). Also I would like to be able to display them in similar formats. I've looked into MS documentation, and I'm more confused than ever. When do I need to use (if at all) IFormatProvider, ICustomFormatter, IFormattable, IParsable, etc. I've gone 'round and 'round, and I'm thoroughly at sea. I'm not a new programmer, just a retired one. I wrote code for about 30 years in everything from COBOL to VB.NET (including some C and C++). I don't need someone to write the code for me, but any hints would be much appreciated.
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Hah been there done that one - try parsing Murex input. We had to build up a set of patterns to test the input against, it took ages to nail the bulk of the patterns that traders would enter as values and they were not limited to 3 characters.
Test each entry against your pattern list, use any found pattern to parse the values, throw an error if no match is found (and add it to your pattern list).
Oh and forget the existing tools as this falls way outside their design specs.
Never underestimate the power of human stupidity -
RAH
I'm old. I know stuff - JSOP
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You mean don't use any of those interfaces, just parse them myself? I'm already kinda of doing that, but I was hoping going the interface method might be more flexible.
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I would also write my own Parser because the rules for this are clear. I'm not sure if I would try against a list because there are not much points to test against :
- 1st I would search for the multiplier (if there is one) - m for 0.001, k for 1000 and M for 1000000
- then I would test the value before the multiplier (if there is one)
- last I would look, if you have a multiplier if there is a value after it
-> now build you output-value
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That's pretty much the way I am doing it now.
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Tracy Dryden wrote: Also I would like to be able to display them in similar formats.
Two ways to do that after you have parsed.
First keep the original value as a string. You can create a class that has both the parsed value and the original value.
Second create your own format method(s) that take the value and normalize the display. Problem with this is you will need to deal with precision.
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Me, wanting to "peek" the "last" entry in a ConcurrentQueue, because the "next" entry I will enqueue needs "prior info" if it exists.
I can use ToArray, and GetEnumerator. Surprising .Last() compiles but I thought I'd "Bing" anyway.
Me: peek last entry in concurrentqueue
Copilot with GPT-4:
Quote: Certainly! In C#, if you want to peek at the last entry in a ConcurrentQueue, you can use the TryPeek method. Here’s an example:
(Some "wrong" / right code).
Quote: In this example, the TryPeek method allows you to examine the last item in the queue without removing it. If the queue is empty, it returns false, and you can handle that case accordingly.
If you have any more questions or need further assistance, feel free to ask! 😊
MSDN re: TryPeek:
Quote: Tries to return an object from the beginning of the ConcurrentQueue<t> without removing it.
Seems it can't differentiate a queue from a stack. Nice. VS is also getting more "aggressive" when it's getting it wrong.
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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It is not intelligent.
Marketing sells it like it is, but we are far away from thinking machines. 
Bastard Programmer from Hell 
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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The good thing about the new "AI" tools is that they always give a reasonable and convincing looking answer.... especially when they are wrong.
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Besides AI getting it wrong:
1) If you have concurrent writers to the queue you do not know something else does not insert a new "last" item after you checked what it is. This can of course be solved with some locking, but then we are at the next point:
2) If you do not have concurrent writers you can just capture the last item to a variable as you enqueue it.
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I'm having a problem with a MessageBox.Show() call.
It's being called from a window that was shown with Form.ShowDialog().
The problem is that the message box sometimes appears behind the dialog box, and makes the dialog box unresponsive until the message box window is found and OK is clicked on it.
This would be terribly confusing for users.
Is there any way to guarantee that a message box is displayed above the form that is calling it?
The difficult we do right away...
...the impossible takes slightly longer.
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The problem is that ShowDialog is a blocking call: it doesn't return control to the UI thread until the dialog has been dismissed. And MessageBox.Show is also a blocking call: it's the equivelant of calling ShowDialog on a "normal" form.
You don't really have many options here other than to create your own message box and call Show on that if you must be able to continue working with it visible.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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You need a different "pattern". If the "error" is critical, exit the dialog, then give the message; then "retry" based on ok / cancel. Or the "dialog" might function better as a "wizard" (next; back; cancel).
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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These are great ideas, thanks!
The difficult we do right away...
...the impossible takes slightly longer.
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You're welcome!
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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Assuming you're using WPF...
You could try my Customizable WPF MessageBox[^].
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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When you call MessageBox.Show(), you can pass the owner form as a parameter. This ensures that the message box will always be displayed above the owner form.
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Thanks! I'll try this.
The difficult we do right away...
...the impossible takes slightly longer.
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I am attempting to update a sql table based off the tables ID (which is self generated by sql when the row was first entered into the table. The below code is what I am trying to use but it will not update the row.
protected void ButtonUpdate_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection("Data Source=ucpdapps2;Initial Catalog=Offline_CAD;Persist Security Info=True;User ID=sa;Password=Propaganda9800!");
con.Open();
SqlCommand cmd = new SqlCommand("Update [Law_Responses] SET (Calltaker=@Calltaker,Date=@Date,City=@City,County=@County,Address=@Address) where TextBox171.text=@ID", con);
cmd.Parameters.AddWithValue("@Calltaker", DropDownList1.SelectedValue);
cmd.Parameters.AddWithValue("@Date", TextBox1.Text);
cmd.Parameters.AddWithValue("@City", DropDownList9.SelectedValue);
cmd.Parameters.AddWithValue("@County", DropDownList2.SelectedValue);
cmd.Parameters.AddWithValue("@Address", TextBox3.Text);
con.Close();
cmd.ExecuteNonQuery();
ScriptManager.RegisterStartupScript(this, this.GetType(), "script", "alert('Incident Was Updated');", true);
}
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