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So you get a byte[] with the length 64?
And you want to access the 12th byte? This can be done with myByteArray[11].
What can we expect this byte to be? I'm not exactly sure about your question, sorry.
Markus
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Sorry for the confusion. My english is not perfect. The hard rate monitor device sends a series of 64 bytes every second ( 1 Hz frequency)each byte has different value from 0 to 255, and i need to work on byte number 12. But unfortunetly I received this series of bytes in ascii (hrArray[] in the following code ). So my question is how to convert what I get ( the ascii) into byte value.
private void serialPort2_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
hrStr = serialPort2.ReadExisting();
if (hrStr == "") return;
hrArray[hrIndex]= hrStr;
lblTest3.Text = hrStr;
sw.WriteLine(hrStr);
hrIndex++;
if (hrIndex == 64)
{
hrSum += Convert.ToInt32(hrArray[12]);
lblTest.Text = hrArray[12];
hrCounter++;
hrIndex = 0;
}
}
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When the data isn't text, you should NOT use text-oriented methods such as ReadExisting() as that would imply two conversions, one from binary to characters (by the method itself) and one back from characters to bytes (by you), both prone to mishaps. You really should use a byte-oriented read, which is Read()[^].
And then it becomes pretty easy to just pick the byte or bytes you really need and work with them.
Warnings:
1. serial communication may get out of sync (some garbage on the line, the PC temporarily not listening due to an overload, ...) , there is no guarantee what comes in will be exactly one message.
2. the DataReceived event will fire when there is "some data" available. There is no guarantee it will fire on the first byte coming in, and there sure is no guarantee the message will have been received completely before it fires. So there is a big chance you will have to collect data and somehow make sure you get synchronized with the messages, possibly having to keep the remainder as the start of the next message for later processing.
The best case would be when the transmission is fast and the pauses between messages are relatively large (say 9600Baud, i.e. could send 1000 bytes/sec, hence a burst of 64 msec and a gap of some 900msec. Then you could use DataReceived, insert a 100msec delay in it (to make sure the entire message has been received), then read it all in one go.
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Hi Luc, I have tried to read the data but no luck. I wrote the following small test program to store the received data in a text file. The data that i want to receive is a binary data packet from the Zephyr Heard Rate Monitor device through a bluetooth. The device sends 60 byte packet every 1 second. The packet format is shown in section 7 of the following following Bluetooth HXM API Guide 2011-05-05.pdfpdf file:https://www.box.com/shared/c169gssedk2nrgu4t41f[^]
namespace ReadZaphyr
{
public partial class Form1 : Form
{
StreamWriter sw = new StreamWriter(@"C:\\myfile.txt");
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
if (!serialPort1.IsOpen)
{
serialPort1.PortName = "COM6";
serialPort1.BaudRate = 115200;
serialPort1.Open();
serialPort1.DataReceived += serialPort1_DataReceived;
}
}
private void btnExit_Click(object sender, EventArgs e)
{
if (serialPort1.IsOpen)
{
serialPort1.Close();
}
sw.Close();
sw.Dispose();
this.Close();
}
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
Thread.Sleep(100);
byte[] buffer = new byte[serialPort1.ReadBufferSize];
int count = serialPort1.Read(buffer, 0, buffer.Length);
for (int i = 0; i < buffer.Length; i++)
{
sw.Write(buffer[i].ToString());
}
}
}
}
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Hi,
I'm not going to download a huge file to glance at one or two pages of it, sorry.
Your DataReceived code needs some changes:
1. I would output the value of count;
2. you should display count bytes, which may be fewer than your buffer's capacity.
3. when data is binary, I always prefer a hex printout; decimal is useless most of the time.
4. the bytes output need a fixed number of characters, otherwise you don't know whether "123" means "12"+"3" or "1"+"23" or ...
In my experience the return on investment for observation tools is immediate, so I suggest you try something like this:
int count = serialPort1.Read(buffer, 0, buffer.Length);
for (int i = 0; i < count; i++) {
if (i%8==0) sw.Write(" ");
sw.Write(buffer[i].ToString("X2"));
sw.Write(" ");
}
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You should be treating the input as a Byte array not an ASCII string. If byte 12 (offset 11 not 12) contains the heart rate then it will be a binary value, not a character so you do not need (indeed should not) Convert.ToInt32().
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Thanks Luc and Richard for your reply. I will give it try what you advice and let you know. Thanks again.
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My program works fine on my computer, but when i try to launch it on another computer i get an error:
Quote: See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.IO.FileNotFoundException: Could not load file or assembly 'System.Data.SqlServerCe, Version=3.5.1.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. Не удается найти указанный файл.
File name: 'System.Data.SqlServerCe, Version=3.5.1.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91'
at datori_inc.iestades..ctor()
at datori_inc.galvenais_logs.button3_Click(Object sender, EventArgs e) in C:\Users\Saidrex\Documents\datori_inc\datori_inc\galvenais_logs.cs:line 39
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].
************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3625 (GDR.050727-3600)
CodeBase: file:///c:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
datori_inc
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: file:///F:/datori_inc/datori_inc/bin/Debug/datori_inc.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3623 (GDR.050727-3600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3631 (GDR.050727-3600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3636 (GDR.050727-3600)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.
For example:
<configuration>
<system.windows.forms jitdebugging="true">
When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.
Do i need Sql server installed on other computers to launch my program? Is it possible to make it somehow to launch without installing Sql server?
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System.IO.FileNotFoundException: Could not load file or assembly 'System.Data.SqlServerCe, Version=3.5.1.0
Above file is missing on other system.
Saidrex wrote: Do i need Sql server installed on other computers to launch my program?
Looks like, your application needs this dll on the system and thus installing it on the computer will resolve it
Saidrex wrote: Is it possible to make it somehow to launch without installing Sql server?
It should be possible. Design your application such that the dependency for the database is not directly on your system. You can try to access DB on other system or use a webservice designed to get data. Currently, it looks like your application is expecting database locally and trying to access it.
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database file is in program folder, i moved my program to another computer with database file in it.
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Saw you solved it. Good to know. 
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Yeah, but anyway, i wanted to be able to launch my application anywhere without installing addition software. But for my fist application this will do. thx =)
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Saidrex wrote: Do i need Sql server installed on other computers
No, you'll need to install Sql Ce.
Bastard Programmer from Hell 
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I installed Microsoft SQL Server Compact 4.0 but i get same error everytime i launch my application.
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Take a look at the version that your application is expecting - the exception mentioned 3.5
Bastard Programmer from Hell
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how stupid =))) later version should be more than enough, but, hey, that's microsoft, nothing ever works as it should =)))
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Ah, yes, because all later versions are "automatically" completely compatible, right? 
Bastard Programmer from Hell
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installed 3.5 version and now it works =))
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Saidrex wrote: later version should be more than enough,
It is a major version change 3 => 4. So quite reasonable and expected that they shouldn't be mixed.
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I have dataGridview table, when i click on specific cell in specific column, it searches text from that cell in other database tables and returns single rows. How to delete found rows from those tables?
I got this far:
private void datoru_sarakstsDataGridView_CellContentClick(object sender, DataGridViewCellEventArgs e)
if (e.ColumnIndex == 7)
{
string a = datoru_sarakstsDataGridView.Rows[e.RowIndex].Cells[1].Value.ToString();
DataRow[] sarakstsRow = datori_database.Tables["datoru_saraksts"].Select("datora_id = '" + a + "'");
sarakstsRow[0].Delete();
DataRow[] konfigRow = datori_database.Tables["konfig"].Select("datora_id = '" + a + "'");
konfigRow[0].Delete();
DataRow[] osRow = datori_database.Tables["operetajsistemas"].Select("datora_id = '" + a + "'");
osRow[0].Delete();
DataRow[] progRow = datori_database.Tables["programmas"].Select("datora_id = '" + a + "'");
progRow[0].Delete();
But when i execute my program and try it, it doesn't delete those rows.
Sorry for my bad english.
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Delete marks the row for deletion by updating the status to Delete.
You still need to call AcceptChanges to delete these rows.
You can read more about the Delete method here[^].
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nope, nothing there helped me.
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Do you want to delete the rows from the datatable or from the database or both?
Never underestimate the power of human stupidity
RAH
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I tried delete rows only from 1 table and it worked, but when i try code posted in first post i get and error: IndexOutofRangeException was unhandled
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