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I am accessing the GUI elements within a thread that I've created and I didn't want to work with delegates because I didn't think it would constitute a problem in a minor project like this.
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SimpleData wrote: Control.CheckForIllegalCrossThreadCalls = false
don't. It does not solve a problem, all it does is suppressing the exception that has been added in .NET 2.0 for a reason; and it does not remedy all the bad things that are bound to happen. Please read this[^] and fix your code accordingly.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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Thanks. I will make the necessary changes.
By the way, in which way can this be causing my problem?
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WinForm Controls aren't thread safe and get accessed quite frequently by the main thread (responding to user actions, repaint messages, etc), so operating them from some other thread as well as from the main thread sooner or later will cause problems.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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It doesn't cause the problem, but it could very well mask the cause of the problem so you won't see it.
Ciao,
luker
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You can try this :
using (FileStream fs = new FileStream(last_save_location, FileMode.Append, FileAccess.Write))
{
fs.Write(message, 8, bytesRead - 8);
fs.Close();
}
I know nothing , I know nothing ...
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Almost always, this is because the log is being called twice, from different threads, in a shorter period than the file takes to open and close. Synchronise the file calls (that is, put a lock block around them).
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hi
i have two forms form1 and form2 i have two btns in form1 if i clik btn1 of form1 btn2 of form1 turns green and form2 opns and form1 hides and if i clk the btn from form2 form1 opns but it do not save the previous values means btn2 of form1 is not green this time. how can i save the previous value.
thanks
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It sounds like in form2 you are creating a new instance of form1 rather than unhiding the existing instance.
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yes m creating the new instance but how can i unhide the existing instance?
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See my reply below for an alternative to the one already given and reasons why it may be a better way.
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That's easy , have no worries
Form1 Code :
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form2 form2;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (form2 == null)
{
form2 = new Form2(this);
form2.Show();
}
else
{
form2.Show();
}
this.Hide();
button2.BackColor = Color.Green;
}
}
}
Form2 Code :
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form2 : Form
{
public Form form1;
public Form2(Form form1)
{
InitializeComponent();
this.form1 = form1;
}
private void Form2_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
if (form1 == null)
{
form1 = new Form();
form1.Show();
}
else
{
form1.Show();
}
this.Hide();
}
}
}
Form1 Is The Main Form
I know nothing , I know nothing ...
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thanks u hve solved my problm
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You welcome , and don't forget to vote for me
I know nothing , I know nothing ...
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You do realise that trolling for votes will only get people downvoting you don't you?
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The solution given works as you have seen BUT it is not generally recommended as now your Form2 is coupled to Form1 , coupling is generally not a good idea.
A better solution is for Form1 to control everything, and Form2 to raise an event to inform Form1 that the button has been clicked:
public partial class Form1 : Form
{
private Form2 form2;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (form2 == null)
{
form2 = new Form2();
form2.ButtonClicked += new EventHandler(form2_ButtonClicked);
form2.FormClosing += new FormClosingEventHandler(form2_FormClosing);
}
form2.Show();
Hide();
button2.BackColor = Color.Green;
}
private void form2_ButtonClicked(object sender, EventArgs e)
{
Show();
form2.Hide();
}
private void form2_FormClosing(object sender, FormClosingEventArgs e)
{
form2.ButtonClicked -= form2_ButtonClicked;
form2.FormClosing -= form2_FormClosing;
form2 = null;
if (!Visible)
Close();
}
}
public partial class Form2 : Form
{
public event EventHandler ButtonClicked;
public Form2()
{
InitializeComponent();
}
protected virtual void OnButtonClicked(EventArgs e)
{
EventHandler eh = ButtonClicked;
if (eh != null)
eh(this, e);
}
private void button1_Click(object sender, EventArgs e)
{
OnButtonClicked(EventArgs.Empty);
}
}
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How can I transcribe a Matlab image processing program (.m files) in C#?
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It's a big question , you need to but your self , at some tutorials
I recommended to start from Here[^]
I know nothing , I know nothing ...
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If you're looking to convert the code from Matlab to C#, you'll have to rewrite it from scratch, by hand. I don't know of any conversion tool that will do it for you.
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Given that this is the C# forum, I'm going to say "no".
Mainly because the link doesn't refer to C# code, but C++.
You can't use that code in C#, and you shouldn't use it in C++ because - as it says at the top of the article - the function that refers to it has been superseded...
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
Manfred R. Bihy: "Looks as if OP is learning resistant."
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OriginalGriff wrote: You can't use that code in C#
You sure?
[DllImport("user32", SetLastError = true, CharSet = CharSet.Auto)]
static extern bool InsertMenu(IntPtr hmenu, uint position, uint flags,
uint item_id, [MarshalAs(UnmanagedType.LPTStr)]string item_text);
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Yes, ok, Mr Picky!
I was trying to simplify for a beginner that he was going the wrong way...
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
Manfred R. Bihy: "Looks as if OP is learning resistant."
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OriginalGriff wrote: as it says at the top of the article - the function that refers to it has been
superseded...
Not entirely... keep reading the statement.
You can still use InsertMenu, however, if you do not need any of the extended features of InsertMenuItem.
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