tut huong dan lap trinh c# voi rs232

Ng ng Hin Hc Vin Hi Qun 2011

1

HNG DN VIT PHN MM TEST RS232 CHO VI IU

KHIN VI VISUAL STUDIO C# 2008

- Cho cc bn, hm nay ngy 05/08/2011, ang ngh php v nh bun qu khng

c vic g lm. Nn lm bi TUT hng dn anh em newbie si C# 2008

giao tip vi vi iu khin.

- Nh chng ta bit y chi vi iu khin m ko giao tip vi PC th ch c g

phi ni c. Trn cc din n cng bn lun v vn ny kh nhiu nht l

vi VB6, VC++ Nhng vi C# th c l l hi t. t ra th ti cng au u khi

mi lm v ko tm thy ti liu ng .

- C l im mnh ca C# chng ta ko cn phi ni n na. Bi TUT s i su vo

phn giao tip cn phn C# cc bn nn c qua v n. Ni chung l n kh d

tip thu so vi thng VB c k v VC++ phc tp. Bi TUT vit cho newbie nn

ti rt c gng lm cho n chi tit cc bn d hiu hn.

- Trc khi vo chng ta s im qua 1 s ni dung trong TUT ny:

SerialPort vi C#

1 s hiu ng (phn ng) ca C#

1. u tin l m VC# ln, v to 1 project mi.

- File / New / Project


2

- Chn Windows Forms Application v t tn cho chng. a n cho chng ta 1

giao din ca lp trnh Form. Ging nh cc bn lm bng VB vy

2. Tip n l chng ta s xy dng giao din nh hnh bn di

- Nh hnh trn cu trc rt n gin ch ch ComboBox, Button v TextBox

- COM, BaudRate, Data Bits, Parity, Stop Bit l cc ComboBox


3

- Kt ni, Ngt, Xa, Thot v SEND l cc Button

- Cn li 2 ng trng c vin xung quanh chnh l cc TextBox

- Chng ta s tin hnh to v t tn cho chng.

- V nh phi t tn cho chng sau mi ln ko ra

ToolBox ch cc Control.

y s dng Common

Control

Button lm nt

nhn

Combox hp iu

khin cha cc Text

TextBox ch vn bn,

dung hin th d

liu nhn v truyn i


4

Tng t nh vy vi cc phn cn li, chng ta s xy dng c giao din

Properties : Ni

thay i cc thuc tnh

ca i tng.

Tn s c t y. y

chnh l tn ca i tng.

Ko xung bn di,

t tn Text. Tn ny

s hin th ln Button


5

Thm 1 cht mm, mui chng ta s c giao din nh hnh bn di

- Giao din nh vy l xong, phn quan trng chnh l code


6

- Trc khi n code ta s gii thch ni dung ca giao din cng nh tn ca cc

control cho tin trong vic tham kho code.

3. Phn CODE

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

// Thm 3 em ny vo l OK, si SerialPort

using System.IO;

using System.IO.Ports;

using System.Xml;

- Chuyn sang phn code bng cch nhp phi chn viewCode, chng ta s thm 2

th vin IO v xml vo.

namespace HIENCLUBVN_RS232

{

public partial class Form1 : Form

{

SerialPort P = new SerialPort(); // Khai bo 1 Object SerialPort mi.

string InputData = String.Empty; // Khai bo string buff dng cho

hin th d liu sau ny.

cbCom

cbRate

cbBits

cbParity

cbBit

btSend

btNgat

btThoat

btKetNoi

btXoa

Ci ny

l lch

cho p

thi

Ca StatusStrip1

Ca Menu

txtSend

txtkq


7

delegate void SetTextCallback(string text); // Khai bao delegate

SetTextCallBack voi tham so string

- Trc mt bn ch quan tm n cu lnh SerialPort P = new SerialPort(); // Khai bo 1 Object SerialPort mi.

- Bc tip l chng ta to d liu cho cc comboBox, bc ny bn nn copy v

dn vo project ca mnh nh thay tn cc combo cho ng vi tn m bn t.

public Form1()

{

InitializeComponent();

// Ci t cc thng s cho COM

// Mng string port ch tt c cc cng COM ang c trn my

tnh

string[] ports = SerialPort.GetPortNames();

// Thm ton b cc COM tm c vo combox cbCom

cbCom.Items.AddRange(ports); // S dng AddRange thay v dng

foreach

P.ReadTimeout = 1000;

// Khai bo hm delegate bng phng thc DataReceived ca Object

SerialPort;

// Ci ny khi c s kin nhn d liu s nhy n phng thc

DataReceive

// Nu ko hiu on ny bn c th tm hiu v Delegate, cn ko

c COPY . Ko cn quan tm

P.DataReceived += new SerialDataReceivedEventHandler(DataReceive);

// Ci t cho BaudRate

string[] BaudRate = { "1200", "2400", "4800", "9600", "19200",

"38400", "57600", "115200" };

cbRate.Items.AddRange(BaudRate);

// Ci t cho DataBits

string[] Databits = { "6", "7", "8" };

cbBits.Items.AddRange(Databits);

//Cho Parity

string[] Parity = { "None", "Odd", "Even" };

cbParity.Items.AddRange(Parity);

//Cho Stop bit

string[] stopbit = { "1", "1.5", "2" };

cbBit.Items.AddRange(stopbit);

// My ci ny kh n gin, bn ng hi v sao. c COPY paste

cho nhanh. :D

}

Bn nn lu l :

public Form1()

{


8


c to ra trc bi C#, chng ta Copy, Paste th phi sau hm khi to InitializeComponent();

Ni chung, c bn n y l xong phn khi to cc combox cho SerialPort ri.

n y bn c th ci t cc thng s cho rs232 bng tay, nu lm ci ny th rs232 c

th gi l Full, v ta c th hon ton lm ch n v nhng ci nh nht.

Lc p vo ta to ra 1 s kin l khi thay i cc gi tr trn combo th chng s c

gi n hm phc v, v cng vic ca chng ta s l y.

private void cbCom_SelectedIndexChanged(object sender, EventArgs e)

{

if (P.IsOpen)

{

P.Close(); // Nu ang m Port th phi ng li

}

P.PortName = cbCom.SelectedItem.ToString(); // Gn PortName bng

COM chn

}

- Nh v d trn l s gi n hm gn gi tr cng ang chn cho PortName

- Tng t nh vy chng ta s lm cho ton b comboBox, cc bn c th tham

kho code di hiu r hn.


{

if (P.IsOpen)

{

Nhp chut

vo y

Ri vo y.

Chnh l cc

s kin m 1

combo c

th c.

p chut

vo y. Lc

u n ko c

ch, p vo

s c.


9


}


COM chn

}

private void cbRate_SelectedIndexChanged(object sender, EventArgs e)

{

if (P.IsOpen)

{

P.Close();

}

P.BaudRate = Convert.ToInt32(cbRate.Text);

}

private void cbBits_SelectedIndexChanged(object sender, EventArgs e)

{

if (P.IsOpen)

{

P.Close();

}

P.DataBits = Convert.ToInt32(cbBits.Text);

}

private void cbParity_SelectedIndexChanged(object sender, EventArgs e)

{

if (P.IsOpen)

{

P.Close();

}

// Vi thng Parity hn lng nhng. Nhng cng OK thi. ^_^

switch (cbParity.SelectedItem.ToString())

{

case "Odd":

P.Parity = Parity.Odd;

break;

case "None":

P.Parity = Parity.None;

break;

case "Even":

P.Parity = Parity.Even;

break;

}

}

private void cbBit_SelectedIndexChanged(object sender, EventArgs e)

{

if (P.IsOpen)

{

P.Close();

}

switch (cbBit.SelectedItem.ToString())

{

case "1":

P.StopBits = StopBits.One;

break;


10

case "1.5":

P.StopBits = StopBits.OnePointFive;

break;

case "2":

P.StopBits = StopBits.Two;

break;

}

}

Vy l xong. Cng vic khi to hon tt, cn by gi l cng vic quan trng

nht. chnh l xy dng cc hm, th tc cho vic nhn v truyn d liu qua COM

// Hm ny c s kin nhn d liu gi n. Mc ch hin th thi

private void DataReceive(object obj, SerialDataReceivedEventArgs e)

{

InputData = P.ReadExisting();

if (InputData != String.Empty)

{

// txtIn.Text = InputData; // Ko dng c nh th ny v khc

threads .

SetText(InputData); // Chnh v vy phi s dng y quyn ti

y. Gi delegate khai bo trc .

}

}

// Hm ca em n l y. ng hi v sao li th.

private void SetText(string text)

{

if (this.txtkq.InvokeRequired)

{

SetTextCallback d = new SetTextCallback(SetText); // khi to

1 delegate mi gi n SetText

this.Invoke(d, new object[] { text });

}

else this.txtkq.Text += text;

}

// Ton b ci ny bn nn COPY, n cng lm ti au u. :D

n y l phn nhn xong, tip n phn gi d liu i. Bn nhp p vo button

SEND, ly s kin ri vit hm theo bn di

// n hm gi data xung COM

private void btSend_Click(object sender, EventArgs e)

{

if (P.IsOpen)

{

if (txtSend.Text == "") MessageBox.Show("Cha c d

liu!","Thng Bo");

else P.Write(txtSend.Text);

}

else MessageBox.Show("COM cha m.", "Thng bo",

MessageBoxButtons.OK, MessageBoxIcon.Error);

txtSend.Clear();

}

// n y coi nh mi vic ngon lnh cnh o ri.


11

// chn tin trong vic Test th chng ta s lm thm bc na.

cho my ci thng s hay dng c chn. Ko cn thit nu bn cm thy ko

cn.

private void Form1_Load(object sender, EventArgs e) // s c gi khi m

chng trnh.

{

cbCom.SelectedIndex = 0; // chn COM c tm thy u tin

cbRate.SelectedIndex = 3; // 9600

cbBits.SelectedIndex = 2; // 8

cbParity.SelectedIndex = 0; // None

cbBit.SelectedIndex = 0; // None

// Hin th Status cho Pro t

status.Text = "Hy chn 1 cng COM kt ni.";

}

Bc cui cng l gii quyt 4 button cn li kt ni, ngt kt ni, thot khi chng trnh v xa d liu c. Bc ny kh n gin bn ch vic nhp p vo tng button ly s kin, c th tham kho code di. private void btKetNoi_Click(object sender, EventArgs e)

{

try

{

P.Open();

btNgat.Enabled = true;

btKetNoi.Enabled = false;

// Hin th Status

status.Text = "ang kt ni vi cng " +

cbCom.SelectedItem.ToString();

}

catch (Exception ex)

{

MessageBox.Show("Khng kt ni c.","Th

li",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

}

private void btNgat_Click(object sender, EventArgs e)

{

P.Close();

btKetNoi.Enabled = true;

btNgat.Enabled = false;

// Hin th Status

p chut vo thanh tiu

ly s kin Load. Hm ny s

c gi ngay khi khi ng.


12

status.Text = " Ngt Kt Ni";

}

private void btThoat_Click(object sender, EventArgs e)

{

DialogResult kq = MessageBox.Show("Bn thc s mun thot",

"HIENCLUBVN", MessageBoxButtons.YesNo, MessageBoxIcon.Question);

if (kq == DialogResult.Yes)

{

MessageBox.Show("Cm n bn s dng chng

trnh","HIENCLUBVN");

this.Close();

}

}

private void btXoa_Click(object sender, EventArgs e)

{

txtkq.Text = "";

txtSend.Text = "";

}

n y l mi vic ngon lnh cnh o ri. c nhn ha chng trnh ca mnh bn c th thm cc label nh v d l : HC VIN HI QUN hay l menu nh Tc Gi v 1 s hiu ng khc mang tnh chuyn nghip Profectional hn :D

- Bng cch l thm 1 project mi: Project / Add Windows Form V to n theo mu l mnh u . Cui cng l thm hm s kin khi nhn vo tc gi nh code di. private void aboutToolStripMenuItem_Click(object sender, EventArgs e)

{

Form2 frm = new Form2();

frm.ShowDialog();

}

// Lu : Tc Gi l 1 control ca ToolStripMenu bn c th li n ra t

Toolbox


13

Lu : Nhn F6 bin dch li trong qu trnh code v F5 chy chng trnh.

4. Ton b code tin tham kho using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

// Thm 3 em ny vo l OK, si SerialPort

using System.IO;

using System.IO.Ports;

using System.Xml;

// Bt u code

namespace HIENCLUBVN_RS232

{

public partial class Form1 : Form

{

SerialPort P = new SerialPort(); // Khai bo 1 Object SerialPort mi.

string InputData = String.Empty; // Khai bo string buff dng cho

hin th d liu sau ny.

delegate void SetTextCallback(string text); // Khai bao delegate

SetTextCallBack voi tham so string

public Form1()

{


// Ci t cc thng s cho COM

// Mng string port ch tt c cc cng COM ang c trn my

tnh

string[] ports = SerialPort.GetPortNames();

// Thm ton b cc COM tm c vo combox cbCom

cbCom.Items.AddRange(ports); // S dng AddRange thay v dng

foreach

P.ReadTimeout = 1000;

// Khai bo hm delegate bng phng thc DataReceived ca Object

SerialPort;

// Ci ny khi c s kin nhn d liu s nhy n phng thc

DataReceive

// Nu ko hiu on ny bn c th tm hiu v Delegate, cn ko

c COPY . Ko cn quan tm


14

P.DataReceived += new

SerialDataReceivedEventHandler(DataReceive);

// Ci t cho BaudRate

string[] BaudRate = { "1200", "2400", "4800", "9600", "19200",

"38400", "57600", "115200" };

cbRate.Items.AddRange(BaudRate);

// Ci t cho DataBits

string[] Databits = { "6", "7", "8" };

cbBits.Items.AddRange(Databits);

//Cho Parity

string[] Parity = { "None", "Odd", "Even" };

cbParity.Items.AddRange(Parity);

//Cho Stop bit

string[] stopbit = { "1", "1.5", "2" };

cbBit.Items.AddRange(stopbit);

// My ci ny kh n gin, bn ng hi v sao. c COPY paste

cho nhanh. :D

}


{

if (P.IsOpen)

{


}


COM chn

}

private void cbRate_SelectedIndexChanged(object sender, EventArgs e)

{

if (P.IsOpen)

{

P.Close();

}

P.BaudRate = Convert.ToInt32(cbRate.Text);

}

private void cbBits_SelectedIndexChanged(object sender, EventArgs e)

{

if (P.IsOpen)

{

P.Close();

}

P.DataBits = Convert.ToInt32(cbBits.Text);

}

private void cbParity_SelectedIndexChanged(object sender, EventArgs

e)

{

if (P.IsOpen)

{

P.Close();


15

}

// Vi thng Parity hn lng nhng. Nhng cng OK thi. ^_^

switch (cbParity.SelectedItem.ToString())

{

case "Odd":

P.Parity = Parity.Odd;

break;

case "None":

P.Parity = Parity.None;

break;

case "Even":

P.Parity = Parity.Even;

break;

}

}

private void cbBit_SelectedIndexChanged(object sender, EventArgs e)

{

if (P.IsOpen)

{

P.Close();

}

switch (cbBit.SelectedItem.ToString())

{

case "1":

P.StopBits = StopBits.One;

break;

case "1.5":

P.StopBits = StopBits.OnePointFive;

break;

case "2":

P.StopBits = StopBits.Two;

break;

}

}

// Hm ny c s kin nhn d liu gi n. Mc ch hin th

thi

private void DataReceive(object obj, SerialDataReceivedEventArgs e)

{

InputData = P.ReadExisting();

if (InputData != String.Empty)

{

// txtIn.Text = InputData; // Ko dng c nh th ny v khc

threads .

SetText(InputData); // Chnh v vy phi s dng y quyn ti

y. Gi delegate khai bo trc .

}

}

// Hm ca em n l y. ng hi v sao li th.

private void SetText(string text)

{

if (this.txtkq.InvokeRequired)

{

SetTextCallback d = new SetTextCallback(SetText); // khi to

1 delegate mi gi n SetText

this.Invoke(d, new object[] { text });


16

}

else this.txtkq.Text += text;

}

// Ton b ci ny bn nn COPY, n cng lm ti au u. :D

// n hm gi data xung COM

private void btSend_Click(object sender, EventArgs e)

{

if (P.IsOpen)

{

if (txtSend.Text == "") MessageBox.Show("Cha c d

liu!","Thng Bo");

else P.Write(txtSend.Text);

}

else MessageBox.Show("COM cha m.", "Thng bo",

MessageBoxButtons.OK, MessageBoxIcon.Error);

txtSend.Clear();

}

// n y coi nh mi vic ngon lnh cnh o ri.

// chn tin trong vic Test th chng ta s lm thm bc na.

cho my ci thng s

// hay dng c chn. Ko cn thit nu bn cm thy ko cn.

private void Form1_Load(object sender, EventArgs e) // s c gi

khi m chng trnh.

{

cbCom.SelectedIndex = 0;

cbRate.SelectedIndex = 3; // 9600

cbBits.SelectedIndex = 2; // 8

cbParity.SelectedIndex = 0; // None

cbBit.SelectedIndex = 0; // None

// Hin th Status cho Pro t

status.Text = "Hy chn 1 cng COM kt ni.";

}

private void btKetNoi_Click(object sender, EventArgs e)

{

try

{

P.Open();

btNgat.Enabled = true;

btKetNoi.Enabled = false;

// Hin th Status

status.Text = "ang kt ni vi cng " +

cbCom.SelectedItem.ToString();

}

catch (Exception ex)

{

MessageBox.Show("Khng kt ni c.","Th

li",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

}

private void btNgat_Click(object sender, EventArgs e)

{

P.Close();

btKetNoi.Enabled = true;

btNgat.Enabled = false;


17

// Hin th Status

status.Text = " Ngt Kt Ni";

}

private void btThoat_Click(object sender, EventArgs e)

{

DialogResult kq = MessageBox.Show("Bn thc s mun thot",

"HIENCLUBVN", MessageBoxButtons.YesNo, MessageBoxIcon.Question);

if (kq == DialogResult.Yes)

{

MessageBox.Show("Cm n bn s dng chng

trnh","HIENCLUBVN");

this.Close();

}

}

private void btXoa_Click(object sender, EventArgs e)

{

txtkq.Text = "";

txtSend.Text = "";

}

private void aboutToolStripMenuItem_Click(object sender, EventArgs e)

{

Form2 frm = new Form2();

frm.ShowDialog();

}

}

}

tut huong dan lap trinh c# voi rs232

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