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And?
Read the book? Do the exercises?
Ask an actual question?
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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read book then practice,3q
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You're welcome, but use "proper" English please: "3q" isn't necessarily understood by all ages in all countries, where "Thank you" is.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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sorry,discoveried by you,my English is poor,I need study English more time later.
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Your English is better than my Mandarin!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Hi, Its not about English. its about shortcut 3q. only after reading comment i understood meaning of 3q. by the way your English is better than mine.
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Pro C# and the .NET framework is a good one, but Wrox and Adison Wesley both publish generally execlent books. Avoid anything with multiple exclamation marks, "in xxx days", or "for dummies" in the title.
If possible, get something in your native language (whatever that is) - it's a lot easier to understand new material when you don't have to try and translate new terms at the same time!
But whatever book you get, start at the beginning, and work through: do the exercises, even if they seem trivial - you learn best by doing, not reading the answers. Books tend to be organised so they build on previous material, and skipping a chapter or two can mean that you miss a lot of useful stuff!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Pick one for yourself: Useful Reference Books[^]
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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very good,i am reading,3q
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And don't post the same thing twice in 3 minutes (or at all) - it'll just get deleted again...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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If you can understand the English, you could read the reviews of that book on Amazon: [^].
That book was published in 2010, and there are a lot of new developments in .NET and C# since then.
If you say more about the level of understanding and coding you are at now, perhaps you can get a recommendation for a more recent book.
cheers, Bill
«What we observe is not nature itself, but nature exposed to our method of questioning» Werner Heisenberg
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oh~I have reply you 2 days ago,but because of net delay not display up,sorry.I read reviews about it on DangDang,very good.bye the way,I just write a small program which would auto check my bbs's register users,not very complex,so it is enough,I think,hehe.Thank you very much,anyway
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when i add shockwave flash object from COM the visual studio was restarting
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And how that related to C#?
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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how to connected database using c# language with web application asp.net
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My purpose in below program is getting 16 bytes of data from microcontroller and processing data for appropriate instructions. There are a lot of related questions and answers here but I couldnt find anything about in below issue. I can get 16 bytes from MCU. Values of bytes are correct and I can see them in dataGridView but the sequence of bytes is changing . For example at first MCUData[0] = 0x01 , MCUData[1] = 0xFE , MCUData[2] = 0xCC then it changes to MCUData[0] = 0xFE , MCUData[1] = 0xCC , MCUData[2] = 0x01. İt is like some problem shifting my datas in byte array. I am sure my MCU is sending data correctly because I checked in one of serial terminal program. My code is in below
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;
namespace SerialCommunicationMCU
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
dataGridView1.Columns.Add("MCUData", "Byte Name");
dataGridView1.Columns.Add("MCUData", "Byte Value");
}
public System.IO.Ports.SerialPort SerialPc;
#region Variables
public string AvailablePort;
public string[] Ports = SerialPort.GetPortNames();
byte[] MCUData = new byte[16];
#endregion
private void Connect_Click(object sender, EventArgs e)
{
DataGreedByteNameShow();
SerialConnectandRead();
ConnectButton.Enabled = false;
DisconnectButton.Enabled = true;
}
private void Disconnect_Click(object sender, EventArgs e)
{
SerialPc.Close();
ConnectButton.Enabled = true;
DisconnectButton.Enabled = false;
}
public void SerialConnectandRead()
{
SerialPc = new SerialPort(AvailablePort, 115200, Parity.None, 8, StopBits.One);
try
{
SerialPc.Open();
SerialPc.DataReceived += new SerialDataReceivedEventHandler(SerialPc_DataReceived);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Serial Port Error");
}
}
private void SerialPc_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
SerialPc.DiscardNull = false;
SerialPc.Read(MCUData, 0, 16);
SerialPc.ReceivedBytesThreshold = 16;
DataGreedByteValueShow();
}
private void Form1_Load(object sender, EventArgs e)
{
foreach (string port in Ports)
{
comboBox1.Items.Add(port);
}
DisconnectButton.Enabled = false;
}
public void DataGreedByteNameShow()
{
dataGridView1.Rows.Add("MCUData[0]");
dataGridView1.Rows.Add("MCUData[1]");
dataGridView1.Rows.Add("MCUData[2]");
dataGridView1.Rows.Add("MCUData[3]");
dataGridView1.Rows.Add("MCUData[4]");
dataGridView1.Rows.Add("MCUData[5]");
dataGridView1.Rows.Add("MCUData[6]");
dataGridView1.Rows.Add("MCUData[7]");
dataGridView1.Rows.Add("MCUData[8]");
dataGridView1.Rows.Add("MCUData[9]");
dataGridView1.Rows.Add("MCUData[10]");
dataGridView1.Rows.Add("MCUData[11]");
dataGridView1.Rows.Add("MCUData[12]");
dataGridView1.Rows.Add("MCUData[13]");
dataGridView1.Rows.Add("MCUData[14]");
dataGridView1.Rows.Add("MCUData[15]");
}
private void DataGreedByteValueShow()
{
dataGridView1.Rows[0].Cells[1].Value = MCUData[0];
dataGridView1.Rows[1].Cells[1].Value = MCUData[1];
dataGridView1.Rows[2].Cells[1].Value = MCUData[2];
dataGridView1.Rows[3].Cells[1].Value = MCUData[3];
dataGridView1.Rows[4].Cells[1].Value = MCUData[4];
dataGridView1.Rows[5].Cells[1].Value = MCUData[5];
dataGridView1.Rows[6].Cells[1].Value = MCUData[6];
dataGridView1.Rows[7].Cells[1].Value = MCUData[7];
dataGridView1.Rows[8].Cells[1].Value = MCUData[8];
dataGridView1.Rows[9].Cells[1].Value = MCUData[9];
dataGridView1.Rows[10].Cells[1].Value = MCUData[10];
dataGridView1.Rows[11].Cells[1].Value = MCUData[11];
dataGridView1.Rows[12].Cells[1].Value = MCUData[12];
dataGridView1.Rows[13].Cells[1].Value = MCUData[13];
dataGridView1.Rows[14].Cells[1].Value = MCUData[14];
dataGridView1.Rows[15].Cells[1].Value = MCUData[15];
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
AvailablePort = comboBox1.SelectedItem.ToString();
}
}
}
modified 10-Jan-15 18:35pm.
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Difficult to guess what is happening, but it is possible your event handler is being called repeatedly and changing the data. Maybe called for every byte received. The only way to find out would be to use your debugger to trace the exact sequence of events.
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I realized that at the starting , my code works well. I mean all 16 bytes of data are correct and in correct sequence. But when it performs 2nd operation , only the sequence is changing. The values are correct. I think emptying buffer after each operation would be appropriate. I can use DiscardInBuffer() method but can you suggest me other effective solution if you know ?
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There is a problem here, which is likely to be that you don't really understand serial ports that well.
When a character arrives on a serial port, you will get a DataReceived event - that doesn't mean that 16 bytes are immediately available: serial ports are slow, and it is very likely that the event will be handled when there is only one character actually available. So trying to read 16 bytes every time the event gets signalled is not likely to do exactly what you want...
And if you read the documentation, the DataReceived event handler is never executed on the UI thread - so adding data to controls is a very, very bad idea.
Instead, consider reading the available bytes into the array and appending them, and then checking to see if you have them all. If you do, then your main process thread can work on the data, rather than the DateReceived thread.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I used SerialPort object from toolbox instead of identify in code, it works correctly now. Thanks for your help
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<button id="asss" onclick="getspeack('hello manh tuyen')">noi thu</button>
<script type="text/javascript">
function getspeack(textvoid)
{
var msg = new SpeechSynthesisUtterance();
var voices = window.speechSynthesis.getVoices();
msg.voice = voices[10]; // Note: some voices don't support altering params
msg.voiceURI = 'native';
msg.volume = 1; // 0 to 1
msg.rate = 1; // 0.1 to 10
msg.pitch = 2; //0 to 2
msg.text = textvoid;
msg.lang = 'en-US';
speechSynthesis.speak(msg);
}
</script>
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