hi. i have a class like this :

public ref class MyClass : public IDisposable
{
.
.
.
public: MyClass();
private: void Wait();
.
.
.
}

and the cpp file:

MyClass::MyClass()
{
// Create a new thread to wait for events
Thread^ t = gcnew Thread(gcnew ThreadStart(&MyClass::Wait));
t->Name = "Event Thread";
t->Start();
}

in compile i got this error : "error C3350: 'System::Threading::ThreadStart' : a delegate constructor expects 2 argument(s)" I've looked in msdn and saw a example that exactly used this way for threading but there was no error in compilation. thank you for help.

sometimes 0 can be 1

How can i record the paint event in the custom control? if you mean that you want to save the picture of a control on paint event then maybe this help: Screen Captures, Window Captures and Window Icon Captures with Spy++ style Window Finder! WindowSnapshot - System Tray Utility To Surgically Capture Bitmaps of Windows/Controls On The Screen

sometimes 0 can be 1

your code is too long and i haven't enough time to read it all. but below is the way to use a thread: my form has two button named "buttonStart" and "buttonStop" when i press the first one my thread starts and when press the second one my thread stops. this is my code :

private: Thread^ myThread;
private: static volatile bool stop;

private: System::Void buttonStart_Click(System::Object^ sender, System::EventArgs^ e) {
myThread = gcnew Thread(gcnew ThreadStart( &Form1::Function ));
stop = false;
myThread->Start();
buttonStart->Enabled = false;
}
private: System::Void buttonStop_Click(System::Object^ sender, System::EventArgs^ e) {
stop = true;
buttonStart->Enabled = true;
}
public: static void Function()
{
MessageBox::Show("thread is now starting");
// for example a "do while" loop
do
{
// do some work
}
while(stop == false);
MessageBox::Show("thread stoped");
}

you can add some extra controls to your form and see that when you press the start button your controls will be alive. my function has a infinite loop and if you run it without threads your UI hangs. however, i suggest you to read these: Thread Class[^] Threading tutorial[^] to get a clean understanding of threads. and there are many perfect articles of threading in CP[^]: 1 2 3 4 5

sometimes 0 can be 1

modified on Wednesday, March 25, 2009 5:37 PM

hi. i think you are looking for a template matching algorithm. there are several ways for this. but the main problem in all algorithms is the size of object. if you looking for a fixed size object then it can be a little easy but when you looking for circles of any size then you should read expert articles in this context. sorry but i don't think that anyone in this heaven can give you a perfect code of this. just google the "template matching" or "object recognition" to get some clues.

sometimes 0 can be 1

i can't download the code from your link. it has a problem. but here is some links which can help you: http://www.codeproject.com/KB/directx/PrgmngDirectShowappsCS.aspx[^] http://www.codeproject.com/KB/directx/directshownet.aspx[^] and the best resource for you is here : http://sourceforge.net/project/showfiles.php?group_id=136334[^] if you want to import codes from other projects to your project you shouldn't use their InitializeComponent() function. just add the necessary initialization codes after your InitializeComponent() function. like this :

public Form1()
{
InitializeComponent();
// add initialization codes here
// ...
}

sometimes 0 can be 1

modified on Wednesday, March 25, 2009 9:26 AM

yes. if your program works in a loop, the only whey to keep your UI alive is to use the Thread. write youre loop in a function and then run it on a thread.

sometimes 0 can be 1

if you are creating a windows form application under CLR category then in Form1.h your code must be like this:

#pragma once
#include "Form2.h"

namespace CircularForm {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
.
.
.

private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {
Form2^ f2 = gcnew Form2();
f2->Show();
this->Close();
}

but when the form1 is closed the managed memory of form2 will be released. the whole program will be ended. there is 2 way to do this: 1. don't close the form1, just hide form1 and when form2 is closed show it(form1) again. 2. add a new class (Form3) containing two objects (Form1 f1, Form2 f2). set it as startup form and control the f1,f2

sometimes 0 can be 1

you should use an IntPtr variable in form2 to hold the Handle of form1 :

public partial class Form1 : Form
{
    Form2 form2;

    public Form1()
    {
        InitializeComponent();
        form2 = new Form2(this.Handle);        
    }

    private void button1\_Click(object sender, EventArgs e)
    {
        this.Hide();            
        form2.Show();            
    }
}

and

public partial class Form2 : Form
{
    private IntPtr friendHandle;

    public Form2(IntPtr hnd)
    {
        InitializeComponent();

        friendHandle = hnd;
    }

    private void button1\_Click(object sender, EventArgs e)
    {
        this.Hide();
        Form.FromHandle(friendHandle).Show();
    }
}

this works fine. i tried if you want to the information in the forms to be saved you souldn't make a new instance of forms in click event but if you don't need them then you are free to do it :laugh:

sometimes 0 can be 1

there is a project type in visual studio : "New Project -> Other Project Types -> Setup and Deployment" i used it and made a setup for my application. it is very cool and has several options that makes your work very easy.

sometimes 0 can be 1

thank you Christian. that helped

sometimes 0 can be 1

i don't understand why some people read the messages just to give unrelated answers. this is a message board and someone asks a question and some people answer to it if the want to. so i f you don't know the answer or don't want to answer just don't do it. noone is going to judge you

sometimes 0 can be 1

there is no need for this option to write a malware. approximately 99% of malwares todays are attaches to windows processes and you can't find them in process list

of course there must be a way to close the process but i want it to be from the program

sometimes 0 can be 1

i have a program that uses a process in background for some calculations. is there a way to prevent the process from being closed from task manager? just like antivirus programs that prevent their processes from being closed.

sometimes 0 can be 1

modified on Monday, February 9, 2009 4:23 PM

you can change the seeds just use the overloaded random construction function like this :

Random rand1 = new Random(1);
Random rand2 = new Random(2);

Console.WriteLine(rand1.Next(50));
Console.WriteLine(rand2.Next(50));

output is : 12 38

sometimes 0 can be 1

please can someboby solve this problem for ever?! this is making me crazy. i googled but nothing was found. there is a "for loop" in my program and i want to break the loop on KeyDown event. my code is like this :

private bool EXIT;
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Escape)
{
EXIT = true;
}
}
private void Function()
{
for (int x = 0; x < Max; x++)
{
if(EXIT)
{
break;
}

     // work on image...
     OnPaintBackground(new PaintEventArgs(this.CreateGraphics(),new Rectangle(0,0,Width,eight)));
 }

}
protected override void OnPaintBackground(PaintEventArgs e)
{
e.Graphics.DrawImage( image, 0, 0, Width, Height);
}

when the Esc key is pressed nothing happens. what i have to do?

sometimes 0 can be 1

i have a project from VC++ 6. i converted it to vc++.net 2005. when i rebuild the program an error appears : "string table error" i have the last version compiled and its work fine. do you have any idea why this error occurs?

sometimes 0 can be 1

here is a simple application I wrote : there is a combobox on my form which lets user to select a program. in this case i just added 3 programs to it : (mediaplayer, freecell, MinesWeeper) also you can add the command line arguments to your process. by clicking the run button the fallowing code will run.

private void runbtn_Click(object sender, System.EventArgs e)
{
Process myProcess = new Process();
int selectedIndex = comboBox1.SelectedIndex;

    switch (selectedIndex)
    {
        case 0:
            myProcess.StartInfo.FileName = "C:/Program Files/Windows Media Player/wmplayer.exe";
            //myProcess.StartInfo.Arguments = "g:\\\\path\\\\filename.mp3";                
            break;
        case 1:
            myProcess.StartInfo.FileName = "c:/windows/system32/winmine.exe";
            break;
        case 2:
            myProcess.StartInfo.FileName = "c:/windows/system32/freecell.exe";
            break;
        default:
            myProcess.StartInfo.FileName = "C:/Program Files/Windows Media Player/wmplayer.exe";
            break;
    }
myProcess.Start();

}

sometimes 0 can be 1

modified on Sunday, June 15, 2008 10:26 AM

ElementHost class is supported in .net faramework 3.5, 3.0 sp1, 3.0 here is the msdn link about this class : http://msdn.microsoft.com/en-us/library/system.windows.forms.integration.elementhost.aspx[^]

sometimes 0 can be 1

thanks i deleted the .ncb file and now it's working.