Re: MS Access Class Generator? - C# Discussion Boards

Re: How to delay to open second instance of application

Rob Philpott12-Aug-09 22:42

12-Aug-09 22:42

Just a quick point - it'd be better to avoid crashes when multiple instances start by addressing that rather than delaying start up. Why does it crash?

You may be able to get a more granular critical section that way. Failing that then a Mutex probably is the way to go.

Regards,
Rob Philpott.

Re: How to delay to open second instance of application

himuskanhere12-Aug-09 23:12

himuskanhere

12-Aug-09 23:12

Hi Rob ,
Thanks for reply/
I am not able to find a reason for crash but it may be reading/writing file at a same time.
Any idea about mutex.WaitOne(...)

Thanks

MS Access Class Generator?

Etienne_12312-Aug-09 22:25

Etienne_123

12-Aug-09 22:25

Anybody know where I can find a decent Class Generator that will generate classes for me based on Access 2007/2003 tables? Preferrably Access 2007.

Re: MS Access Class Generator?

PIEBALDconsult13-Aug-09 8:01

PIEBALDconsult

13-Aug-09 8:01

Such auto-generated classes would likely be useless. There is no substitute for doing it yourself.

Re: MS Access Class Generator?

Etienne_12318-Aug-09 1:09

Etienne_123

18-Aug-09 1:09

Well I've actually downloaded a class generator that works with Access 2003 and it works perfectly, generated all the classes for me together with methods for adding, updating etc.

Re: MS Access Class Generator?

JWilliams@SWCG28-Sep-09 2:22

JWilliams@SWCG

28-Sep-09 2:22

Can you state where you downloaded the class generator or even just it's name? I too am looking for this kind of product.

Re: MS Access Class Generator?

Etienne_12328-Sep-09 4:11

Etienne_123

28-Sep-09 4:11

Try http://sourceforge.net/projects/d4modelizer/[^], Or do a Google search on D4Modelizer

Re: MS Access Class Generator?

JWilliams@SWCG28-Sep-09 9:15

JWilliams@SWCG

28-Sep-09 9:15

Thank you very much.

Datagrid location on print page

spankyleo12312-Aug-09 22:18

spankyleo123

12-Aug-09 22:18

Hi all,

I have a form with datagridview , some datetime pickers and some textboxes. I have modified the code found on this webpage to draw the rows and columns of the datagrid
http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols/thread/dc9d3acf-ccf8-457f-ba31-ef09fb357aee/ on the print page . The datagrid is getting drawn on the top of the page. I want to display the textbox contents and datetimepicker contents before the datagrid. Can any1 let me know how to draw the datagrid at the middle of the page with reference to the code in the link.. Thanks,

Re: Datagrid location on print page

Henry Minute13-Aug-09 3:43

Henry Minute

13-Aug-09 3:43

There are several code snippets on that link and you do not say which you are trying to use.

However, the grid will be being drawn at coordinates specified somewhere in the code, most probably using DrawRectangle() although that is not certain.

DrawRectangle() most commonly uses a Point structure or a Rectangle structure. So you need to look for a Point parameter that is set to Point(0, 0), if the grid is at top left, or Point(?, 0), if it is just somewhere along the top. The same would apply to the first parameter of a Rectangle() if that is what is used.

Find the one that you think draws the grid and experiment with the numbers e.g. try Point(20, 20), run it and if the grid is in a different place then you have found the correct parameter, if not, put it back to what it was before and try another one till you succeed.

Good Luck! Smile | :)

Henry Minute

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Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Abort or Stop Thread using c#

Abdul Rahman Hamidy12-Aug-09 21:36

Abdul Rahman Hamidy

12-Aug-09 21:36

I have following code in my start button which starts the process.

void BtnStartClick(object sender, EventArgs e)
		{
			btnStart.Enabled=pdfStopped=xmlStopped=false;
			btnStop.Enabled=true;
			ThreadPool.QueueUserWorkItem(new WaitCallback(Startup));
		}
		void Startup(object s)
		{
			try
			{
				Start();
				timGeneral.Enabled=true;
				timGeneral.Start();
			}
			catch(Exception){}
		}
		void Start()
        {
			pdfThread=new Thread(new ThreadStart(pdfDownloadStart));
			pdfThread.IsBackground=true;
			pdfThread.Start();
			xmlThread=new Thread(new ThreadStart(startXMLDownload));
			xmlThread.IsBackground=true;
			xmlThread.Start();
		    pdfStThread = new Thread(new ThreadStart(createPdfFileStructure));
            pdfStThread.IsBackground = true;
            pdfStThread.Start();
        }

well i am trying to stop all these running threads in stop button, but i could not achieve it
how can i stop all threads?

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Re: Abort or Stop Thread using c#

stancrm12-Aug-09 21:49

stancrm

12-Aug-09 21:49

try to avoid using Abort to stop the thread. Use flag to abort the thread.
I got a lot of problem using Abort.

while(isThreadRunning)
{
  ...
}

to stop it, set isThreadRunning = false;

Re: Abort or Stop Thread using c#

OriginalGriff12-Aug-09 21:50

OriginalGriff

12-Aug-09 21:50

Note: you must declare isThreadRunning as volatile, or it will be optimised out...

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Re: Abort or Stop Thread using c#

Abdul Rahman Hamidy12-Aug-09 22:02

Abdul Rahman Hamidy

12-Aug-09 22:02

well, my friend, if u see i have used
ThreadPool.QueueUserItem(...);
How should i get rid of this to stop all threads.

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Re: Abort or Stop Thread using c#

stancrm12-Aug-09 22:56

stancrm

12-Aug-09 22:56

You must implement the code, that I sent, in these methods:
pdfDownloadStart
startXMLDownload

Then set isThreadRunning=false to end the thread.

Re: Abort or Stop Thread using c#

Abdul Rahman Hamidy13-Aug-09 0:18

Abdul Rahman Hamidy

13-Aug-09 0:18

well, i think u guys did not understand me correctly, bellow is the complete code only for "pdfDownloadStart"

void StartStructureTimer(int time)
		{
			timStructure=new System.Threading.Timer(new TimerCallback(TimerStructureJob));
			timStructure.Change(time,0);
		}
		void TimerStructureJob(object state)
		{
			System.Threading.Timer tm=state as System.Threading.Timer;
			tm.Dispose();
			pdfDownloadStart();
		}
		void pdfDownloadStart()
		{
			try
			{
				signalMessage(string.Format("Searching Server {0} for newly added Files",fdo.FtpServer));
				dtList=p.getPdfNotDownloaded();
				if (dtList.Rows.Count>0)
				{
					signalMessage(string.Format("{0} Files Found for Download",dtList.Rows.Count));
					fdo.FilesToDownloadList=dtList;
					fdo.LocalDownloadDirectory=TempDirectory;
					Thread tPdf=new Thread(new ThreadStart(downloadFile));
					tPdf.Start();
					tPdf.Join();
					if (!fdo.DownloadStatus)
					{
						if (timDownload!=null)
							timDownload.Dispose();
						signalMessage("Download Failed\r\nretrying in 60 second");
						StartTimer(36000);
					}
					else if (fdo.DownloadStatus)
					{
						if (timDownload!=null)
							timDownload.Dispose();
						signalMessage("All Files Downloaded Successfully\r\nretrying in 60 second");
						StartTimer(36000); //when downloading finished then start again in 60 second
						return;
					}
					else
						StartTimer(36000); // 60 second
				}
				else
				{
					signalMessage("No Files Found\r\nretrying in 60 second");
					StartTimer(36000);
				}
			}
			catch(Exception ex)
			{
				if (!pdfStopped)
				{
					signalMessage("Failed downloading Files from Remote Server "+ex.Message+"\r\nretrying in 60 second");
					StartTimer(36000);
				}
				else
					signalMessage("Failed downloading Files from Remote Server "+ex.Message);
			}
		}

all methods which runs on those thread has the same functionality. if u see after "60 second" process runs agains.
if i abort or stop the thread still the job runs after 60 seconds.
if u see closly another thread is running to download the files, well i want to stop all these threads, if i use bool value like that still the scheduled process runs.
how can i stop all these threads from calling thread to end?

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Re: Abort or Stop Thread using c#

stancrm13-Aug-09 1:33

stancrm

13-Aug-09 1:33

Hmm.. I think you should redesign it. You start a threadpool, in threadpool you start a thread, in that thread you start a thread again.. wow.. Smile | :)

Re: Abort or Stop Thread using c#

OriginalGriff12-Aug-09 21:49

OriginalGriff

12-Aug-09 21:49

Try here: How to create and terminate threads[^]

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Re: Abort or Stop Thread using c#

0x3c012-Aug-09 22:57

0x3c0

12-Aug-09 22:57

Since you've set the IsBackground property to true, those threads get aborted when the program closes. Alternatively, you could all pdfThread.Stop, etc.

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And the reality
Between the motion
And the act
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Custom Event and Cross-thread operation not valid Question

Programm3r12-Aug-09 21:22

Programm3r

12-Aug-09 21:22

Hi all,

I am busy developing a custom TCP/IP server. The server has a few events namely, NewTcpData, NewTcpClient and TcpClientDisconnected. At the moment I just want to know of these events.

So I have created the events and all is working fine, but as soon as I call the event from my GUI app, I receive a message stating: Cross-thread operation not valid ...

So normally I would hook the GUI control to the SynchronizationContext.
For example:

context.Send(new SendOrPostCallback((s) => this.textBox1.Text = "Some Data"), null);

So, my question: how can I develop / alter the event(s) (which runs on a separate thread that the main) to not make use of the above technique, and still be able to send / set data to the GUI controls?

Many thanks in advance.
Kind regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Custom Event and Cross-thread operation not valid Question

N a v a n e e t h13-Aug-09 1:25

N a v a n e e t h

13-Aug-09 1:25

Programm3r wrote:
So, my question: how can I develop / alter the event(s) (which runs on a separate thread that the main) to not make use of the above technique, and still be able to send / set data to the GUI controls?

If you have to set values to controls that are created by a separate thread, you need techniques like SynchronozationContext , Invoke/BeginInvoke.

BTW, why do you want to do this?

Navaneeth

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Re: Custom Event and Cross-thread operation not valid Question

Programm3r13-Aug-09 1:35

Programm3r

13-Aug-09 1:35

Thanks for the response Navaneeth.

N a v a n e e t h wrote:
BTW, why do you want to do this?

Because, I want to be able to give the user visual confirmation of the following:

New TCP/IP clients that has connected

New TCP/IP data that has arrived

Inform the user when a client has disconnected

Unless you have other suggestions on how this could be achieved?

Thanks again.
Kind regards,

The only programmers that are better C# programmers, are those who look like this -> Green Alien | [Alien]

Programm3r
My Blog: ^_^

invoking events of a control under another control

jamesjk12-Aug-09 20:27

jamesjk

12-Aug-09 20:27

hi,

need your help to solve this issue..

i have a custom pictureedit control in which i have many custom properties and events. i need to place an image OVER this in another ordinary picture edit and should be able to work on the events in the picture edit in the lower layer.

i'll make it clearer...

in my custom pictureedit i have added a feature to measure the distance between 2 points. now what i need to do is place another image over the main image and while comparing these images should be able to take the measurements from the lower image...

hope you guys understood my issue clearly...

tons of thanks in advance for any help

Re: invoking events of a control under another control

Eslam Afifi12-Aug-09 21:34

Eslam Afifi

12-Aug-09 21:34

I'm not sure I understood correctly. You have 2 controls, one on top of the other, the covered one is a custom control (you wrote it?) and you want mouse events, I suppose, to pass through to the covered control?
If it's your custom control (you have its code) then you can add methods you can call from the top control mouse event handlers then you make those metods call OnMouse.. methods, raise the events or do what you want to do directly in them. If you don't have the code, I think you can send the appropriate message(s) to the covered control using SendMessage[^].

Eslam Afifi

Re: invoking events of a control under another control

jamesjk13-Aug-09 0:02

jamesjk

13-Aug-09 0:02

Thanks eslam...

i tried using the sendmessage function.. but till now i've not been able to implement it successfully..

so can you help me in this...

actually i make the measurement by dragging through the custom pictureedit(i dont have the source code) which is below the covering control

i tried sending the WM_MOUSEMOVE alone & WM_LBUTTONDOWN & MOUSEMOVE together but nothing much happened...

[DllImport("user32.dll")]
        static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern int SendMessage(IntPtr hWnd, int wMsg, IntPtr wParam, IntPtr lParam);

        private const int WM_MOUSEMOVE = 0x200;
        private const int WM_LBUTTONDOWN = 0x201;
        private void button2_Click(object sender, EventArgs e)
        {
            SendMessage(axe.Handle, WM_LBUTTONDOWN, IntPtr.Zero, IntPtr.Zero);
            SendMessage(axe.Handle, WM_MOUSEMOVE, IntPtr.Zero, IntPtr.Zero);
}

once again thanks for showing the light..

hope you woulld be able to lead me further

thanks

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