why my graph error??? - C# Discussion Boards

16-Sep-14 22:20

You do know that it's dynamic data don't you? So, change the data and then capture the screenshot. There's even an article on here that shows thow to capture the screen[^].

why my graph error???

rikiz16-Sep-14 19:30

16-Sep-14 19:30

anyone can help me,.,
i try to make a graph in c# like this video in youtube :

http://www.youtube.com/watch?v=Tay4t1Wo-As[^]

i have been doing all of procedure like this tutorial..
in tutorial
when program running..no error happend..
when i try run my program that i made, error happend

error program is = "axMathworks_Strip1.AddXY(0, a, Convert.ToDouble(textBox1.Text));"

this is a full program
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;

namespace nyobaan_library1
{
public partial class Form1 : Form
{
Double a,b;

public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
button1.Enabled = false;
}

private void timer1_Tick(object sender, EventArgs e)
{

a++;
axMathworks_Strip1.AddXY(0, a, Convert.ToDouble(textBox1.Text));
}
}
}

iam using library MWStrip.ocx active X

computer say :
"nput string was not in a correct format."

any one can help me????

Pete O'Hanlon16-Sep-14 19:56

16-Sep-14 19:56

What value is in your TextBox? You might want to try something like this:

double coordinate;
if (double.TryParse(txtBox1.Text, out coordinate)
{
  axMathworks_Strip1.AddXY(0, a, coordinate);
}

rikiz18-Sep-14 18:42

18-Sep-14 18:42

thanks so much ....^_^

i am still not understand..
why this coding error
"axMathworks_Strip1.AddXY(0, a, Convert.ToDouble(textBox1.Text));"
in video tutorial, error is not happening???
Convert.ToDouble(textBox1.Text)); error in this section....

and your coding
double coordinate;
if (double.TryParse(txtBox1.Text, out coordinate)
{
axMathworks_Strip1.AddXY(0, a, coordinate);
}
i add "a++" when i run, the program successfully executed....can u give me short explanation...sorry for my english..

Pete O'Hanlon18-Sep-14 19:37

18-Sep-14 19:37

The reason my version works and yours didn't is because of what TryParse does. Basically, if it cannot parse the value into a double then it will not execute the Add section. Using Convert.ToDouble will throw an exception if it cannot convert the value.

rikiz1-Oct-14 9:02

1-Oct-14 9:02

thanks for the enlightenment, it was so helping me ....

rikiz3-Oct-14 17:57

3-Oct-14 17:57

I tried to connect the data adc atmega 16 microcontroller application to C # that has been created with the help of the code that you help ..
private void timer1_Tick (object sender, EventArgs e)
         {
             double coordinate;
             b ++;
             if (double.TryParse (txtDataTerima.Text, out coordinate))
             {
                 axMathworks_Strip1.AddXY (0, b, coordinate);
             }
         }

This code can only display data manually ..
I try to make it automatically with the help of serial ports
but in a textbox that I created
the data that I received with the help of data reception code:
string a;
private void serialPort_DataReceived (object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
         {
             txtDataTerima.BeginInvoke (new myDelegate (updateTextBox));
         }
         public delegate void myDelegate ();
         public void updateTextBox ()
         {
             a = serialPort.ReadExisting ();


             txtDataTerima.AppendText (a);
             txtDataTerima.ScrollToCaret ();
         }
textboxt data displayed through serial communication, data updates down when there are changes in the value of adc input of the microcontroller
I try again to change the code
acceptance of data updates

full program
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;

namespace GrafikADC
{
public partial class Form1 : Form
{
double b;

double apa;
string a;
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
//—menset event handler untuk DataReceived event—
// serialPort.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler();
//—menampilkan nama serialport yang tersedia pada
// komputer—
string[] portNames = System.IO.Ports.SerialPort.GetPortNames();
for (int i = 0; i <= portNames.Length - 1; i++)
{
cbbCOMPorts.Items.Add(portNames[i]);
}
btnDisconnect.Enabled = false;
}

private void btnConnect_Click(object sender, EventArgs e)
{
//—menutup akses serialport apabila akses serialport terbuka—
if (serialPort.IsOpen)
{
serialPort.Close();
}
try
{
//—mengatur beberapa parameter untuk koneksi serial
// port—
serialPort.PortName = cbbCOMPorts.Text;
serialPort.BaudRate = 9600;
serialPort.Parity = System.IO.Ports.Parity.None;
serialPort.DataBits = 8;
serialPort.StopBits = System.IO.Ports.StopBits.One;
//—buka serial port—
serialPort.Open();
//—menampilkan status dari serial port dan
// enable/disable -kan tombol—
lblMessage.Text = cbbCOMPorts.Text + " connected.";
btnConnect.Enabled = false;
btnDisconnect.Enabled = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}

private void btnDisconnect_Click(object sender, EventArgs e)
{
try
{
//—tutup serial port—
serialPort.Close();
//—menampilkan status dari serial port dan
// enable/disable -kan tombol—
lblMessage.Text = serialPort.PortName + " disconnected.";
btnConnect.Enabled = true;
btnDisconnect.Enabled = false;
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}

private void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
txtDataTerima.BeginInvoke(new myDelegate(updateTextBox));
}
public delegate void myDelegate();
public void updateTextBox()
{
a = serialPort.ReadExisting();

txtDataTerima.AppendText(a);
txtDataTerima.ScrollToCaret();
txtDataTerima.Clear();

}

private void button3_Click(object sender, EventArgs e)
{
timer1.Start();
button3.Enabled = false;
}

private void timer1_Tick(object sender, EventArgs e)
{
double coordinate;
b++;
if (double.TryParse(txtDataTerima.Text, out coordinate))
{
axMathworks_Strip1.AddXY(0, b, coordinate);
}
}

}
}

This is a program I created delivery microcontroller :
#include <mega16.h>

#include <delay.h>

int a,b;
char riki[33];

// Alphanumeric LCD functions
#include <alcd.h>

// Standard Input/Output functions
#include <stdio.h>

#define ADC_VREF_TYPE 0x00

// Read the AD conversion result
unsigned int read_adc(unsigned char adc_input)
{
ADMUX=adc_input | (ADC_VREF_TYPE & 0xff);
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSRA|=0x40;
// Wait for the AD conversion to complete
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
return ADCW;
}
while (1)
{
// Place your code here
a = read_adc(2);
lcd_gotoxy(0,0);
sprintf(riki, "adc1=%d",a);
lcd_puts(riki);
delay_ms(50);
lcd_clear();

printf("%d\n", a);delay_ms(100);
}
}

V.16-Sep-14 23:18

16-Sep-14 23:18

I'm assuming it be due to the textbox value. Some countries use a dot as decimal seperator, others use a comma. In the background of the code this is not so. (always dot). To make sure that your textbox value parses to a double correctly look into the double.TryParse function.

V.

(MQOTD rules and previous solutions)

rikiz18-Sep-14 18:45

18-Sep-14 18:45

thanks for the explanation..
but iam still not understand.... Frown | :(

V.18-Sep-14 19:29

18-Sep-14 19:29

in that case you better start by picking a C# book and start reading from the start. This is very basic stuff.

A textbox gives the user's input as a piece of text, a string. a double is a certain type of number. Your computer is a machine and it only know 0 and 1. In this case the function expects a double, which is represented as a different series of 0 and 1's than a string, hence it doesn't understand the input. To make the input change from text to double you need to "parse" it. (parsing is like converting, you change the text value 1.123 into a double number 1.123 which is represented differently), but the "parsing" function makes some "assumptions" on the text it is given. (decimal operator is a . or , eg).

int, bool, double, float, string, char, ... they're all represented differently in the machine.

hope this clarifies things, but take the first sentence as advice, please.

V.

(MQOTD rules and previous solutions)

rikiz1-Oct-14 9:01

How do I select, drag and align the controls like Visual Studio at the running time ?

1-Oct-14 9:01

thank you for your valuable input

Javafree16-Sep-14 15:31

Javafree

16-Sep-14 15:31

How do I select, drag and align the controls like Visual Studio at the running time ?

Re: How do I select, drag and align the controls like Visual Studio at the running time ?

Pete O'Hanlon16-Sep-14 19:58