Visual Basic

Windows service and dependencies

10-Oct-08 20:38

am trying to draw rectangle but it is drawn just with a single click (with different lengths and widths) also it is going out of pictureBox area But i want it to start from where mouse key is pressed and end where mouse key is released. i think there is something wrong with my quardinate. Waiting for reply.
Thanks

[code]

Dim x1, y1, x2, y2 As Integer
Dim MD, MU As Point
Dim mywidth As Integer
Dim drawtool As String
Dim drawpen As Pen
Dim g As Graphics

Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
MD = e.Location
x1 = MD.X
y1 = MD.Y
End Sub

Private Sub PictureBox1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseUp
If e.Button = Windows.Forms.MouseButtons.Left Then
MU = e.Location
x2 = MD.X
y2 = MD.Y
DrawRectangle()
End Sub

Public Sub DrawRectangle()
gr = PictureBox1.CreateGraphics
Dim solidColorBrush As SolidBrush = New SolidBrush(Color.Red)
Dim coloredPen As Pen = New Pen(solidColorBrush)
coloredPen.Width = 3
coloredPen.Color = Color.Blue

Dim drawArea2 As Rectangle = New Rectangle(x1, y1, x2, y2)
gr.DrawRectangle(coloredPen, drawArea2)
gr.Dispose()

End Sub

[End code]

KreativeKai10-Oct-08 8:33

KreativeKai

10-Oct-08 8:33

I have a windows service that I'm currently writing that will start automatically when the server that it is installed on is rebooted.

The service will look up some data on a SQL table and then close the database and continue working without opening SQL again.

This should work fine with one exception. What happens if the MSSQLSERVER service hasn't started yet?

What is the procedure to add code to my service to create dependencies that MSSQLSERVER has to be running before my service starts?

Any help is appreciated. Confused | :confused:

Lost in the vast sea of .NET

jzonthemtn10-Oct-08 8:43

jzonthemtn

10-Oct-08 8:43

Insted of creating dependencies, can you just check the status of the MSSQLSERVER service and start it if it is not running?

KreativeKai10-Oct-08 8:47

KreativeKai

10-Oct-08 8:47

I thought about that, but I don't want the service to just shut down if it can't find SQL. With dependencies doesn't the server sort of handle the order that it starts everything to make sure a service that depends on another service doesn't get started first? Confused | :confused:

Lost in the vast sea of .NET

jzonthemtn10-Oct-08 8:50

jzonthemtn

10-Oct-08 8:50

I'd say you're right. I usually try to take the easy way out. Smile | :)

Check this out: How to: Code Service Dependencies[^]

It appears there is a ServicesDependedOn property on the ServiceInstaller class.

Question about objects and forms

KreativeKai10-Oct-08 9:31

KreativeKai

10-Oct-08 9:31

It worked perfectly! Thanks! Smile | :)

Lost in the vast sea of .NET

sa_runner10-Oct-08 7:57

sa_runner

10-Oct-08 7:57

I've been writing an app (desktop) that has information that needs to be passed between forms. I'd like to use an object to move the information about the forms, but it didn't seem too feasible. I did some research online and most people say to use a 'global' module that holds the variables that are common amongst the forms, but there are trade-offs. However they (the articles I've read) won't specify the trade-offs. Is it a performance issue that is caused by doing this? Is there a way to move an object from form to form cleanly?

I'm just curious as to this community's thoughts on the subject. If this needs to move to another forum area, please feel free. I placed it here because I develop in VB.Net 2k5.

Thanks in advance.

Re: Question about objects and forms

Wendelius10-Oct-08 8:06

Wendelius

10-Oct-08 8:06

I would say that the trade-off isn't in performance but in maintainability. In my point of view, this is a modelling problem.

Have a look at this article for example: Building an MVP Framework for .NET. Part 1: The Basics of MVC and MVP[^]

The need to optimize rises from a bad design

Re: Question about objects and forms

sa_runner12-Oct-08 18:00

sa_runner

12-Oct-08 18:00

Thank you! This was very helpful.

Re: Question about objects and forms

Wendelius13-Oct-08 5:17

Wendelius

13-Oct-08 5:17

You're welcome.

The need to optimize rises from a bad design.

My articles[^]

how to draw a line on a picture box

flamingo210-Oct-08 3:12

Re: how to draw a line on a picture box

10-Oct-08 3:12

I want to draw a line on a picture box, when mouse key is pressed it will save the current position and when mouse key is released it will draw a line up till that point. but my code is not working, can any body help me out of this.

[code]
Public Class Form1
Dim x1, y1, x2, y2 As Integer

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

End Sub

Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
x1 = MousePosition.X
y1 = MousePosition.Y
End Sub

Private Sub PictureBox1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseUp
x2 = MousePosition.X
y2 = MousePosition.Y
End Sub

Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint

e.Graphics.DrawLine(Pens.Black, x1, y1, x2, y2)

End Sub
End Class

[end code]

thanks in advance
Fareed

Thomas Stockwell10-Oct-08 4:29

Thomas Stockwell

10-Oct-08 4:29

It may be best to just create a custom control so that you can manage all the drawing so that it is exactly what you want. The picturebox control is basically only used for displaying pictures and not much else, but a custom control can do what you want and more.

Regards,
Thomas Stockwell

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.

Visit my Blog

Re: how to draw a line on a picture box

C1AllenS10-Oct-08 4:55

C1AllenS

10-Oct-08 4:55

Hello,

You can try the given code.

BEGIN CODE

<br />
    Dim MD, MU As Point<br />
<br />
    Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown<br />
<br />
        MD = e.Location<br />
<br />
    End Sub<br />
<br />
    Private Sub PictureBox1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseMove<br />
<br />
        If e.Button = Windows.Forms.MouseButtons.Left Then<br />
<br />
            MU = e.Location<br />
            DrawLine()<br />
        End If<br />
<br />
    End Sub<br />
<br />
    Private Sub PictureBox1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseUp<br />
<br />
        MU = e.Location<br />
        DrawLine()<br />
<br />
    End Sub<br />
<br />
    Public Sub DrawLine()<br />
<br />
        Dim g As Graphics<br />
        g = Me.PictureBox1.CreateGraphics<br />
        g.Clear(Me.PictureBox1.BackColor)<br />
        g.DrawLine(Pens.Blue, MD, MU)<br />
        g.Dispose()<br />
<br />
    End Sub<br />

I hope this will help.

Regards,

Allen Smith

ComponentOne LLC
www.componentone.com

Re: how to draw a line on a picture box

flamingo210-Oct-08 9:49

how to draw a rectangle on a pictureBox

10-Oct-08 9:49

hy thnx Allen, your code works fine . but i also want to draw a rectangle on picture box and for this i need to know the quardinate of mouse down and up position. I also want to use freehand drawer, i dont have any idea abt it. Thanks for the solution again.

Fareed

flamingo210-Oct-08 20:05

Controls and threads problem

10-Oct-08 20:05

I am trying to draw rectangle but it is drawn just with a single click (with different lengths and widths) also it is going out of pictureBox area But i want it to start from where mouse key is pressed and end where mouse key is released. i think there is something wrong with my quardinate. Waiting for reply.
Thanks

[code]

Dim x1, y1, x2, y2 As Integer
Dim MD, MU As Point
Dim mywidth As Integer
Dim drawtool As String
Dim drawpen As Pen
Dim g As Graphics

Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
MD = e.Location
x1 = MD.X
y1 = MD.Y
End Sub

Private Sub PictureBox1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseUp
If e.Button = Windows.Forms.MouseButtons.Left Then
MU = e.Location
x2 = MD.X
y2 = MD.Y
DrawRectangle()
End Sub

Public Sub DrawRectangle()
gr = PictureBox1.CreateGraphics
Dim solidColorBrush As SolidBrush = New SolidBrush(Color.Red)
Dim coloredPen As Pen = New Pen(solidColorBrush)
coloredPen.Width = 3
coloredPen.Color = Color.Blue

Dim drawArea2 As Rectangle = New Rectangle(x1, y1, x2, y2)
gr.DrawRectangle(coloredPen, drawArea2)
gr.Dispose()

End Sub

[End code]

web browser

Shazz Rock10-Oct-08 0:45

Shazz Rock

10-Oct-08 0:45

hello everyone.

i want to open website by using vb6.0 application.

Please help..

Shazz here to help you...

Re: web browser

jzonthemtn10-Oct-08 3:52

jzonthemtn

10-Oct-08 3:52

To open the default web browser to a webpage, see How To Use ShellExecute to Launch Associated File[^]. And just as a tip, you might want to ask your question in a better way (more descriptive, specific).

Re: web browser

LloydA11110-Oct-08 8:37

LloydA111

10-Oct-08 8:37

And including clear punctuation.

Lloyd J. Atkinson

"Logic will get you from A to B, but imagination will take you everywhere" - ALbert Einstein

I look at Microsoft, and turn to my poster on the wall saying: "Bang head here in case of stress".

ambio9-Oct-08 22:52

ambio

9-Oct-08 22:52

Hi everyone,
I'm writing a Windows Forms application that shows movies, images, scrolling text, ... in different panels on a form.

This is the process that I do:
1) I create the different panels on the form
2) I create an object of another class (MyClass), set some properties and call the start method of the created object.
3) The start method creates an instance of a control to show the movie, image, scrolling text, ... and add this instance to the right panel.
--> Step 2 and 3 happens for each panel on the form.

I encounter one problem when I use this process. I see that the scrolling text waits for a short moment when the movie starts to load, after it is loaded the text is running again. I thought that I could fix this problem by using threads.

So I changed my process:
1) I create the different panels on the form (MainThread)
2) I create an object of MyClass and set the property where the movie, image,... has to run in (so in which panel)
3) I create a new thread (MyNewThread). When the thread starts, I execute the start method in the MyClass object. This start method makes a new instance of a control. To add my instance of the control to the panel, I have to invoke my panel. Which results that I'm back in the MainThread. So the control, plays again in the MainThread.

So this process don't solve the problem about my scrolling text.

I want that the controls are running in a different thread than the MainThread. But I think this is not possible, because the main form is running in the MainThread and everything that I want to add on the form has to be done in the MainThread by using the invoke. I'm right?

The only thing that I want is that the instance of a control in a panel is working on his own. So that loading some things in one control does not have an influence on another control.

Has someone any idea to do it?

Thanks in advance,

Kurt.

Dave Kreskowiak10-Oct-08 1:04

Dave Kreskowiak

10-Oct-08 1:04

Move your scrolling text to its own control that, itself, is threaded.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

ambio10-Oct-08 4:40

ambio

10-Oct-08 4:40

Hi Dave,

Thanks for your answer. We did what you have written. Our scrolling text was already a control, so the only thing that we had to do is adding a thread that does the work to scroll the text. But we have noticed that the OnPaint method (draws the text, and is executed by the Paint event of the form) is executed in the MainThread and not in the new thread that we have created. So the text is drawed on the form in the MainThread. The OnPaint event is triggerd by calling the invalidate method. The handler that says what to do in the MyBase.Paint event is also set in the new thread. Is it possible to execute the OnPaint method in our new created thread?

Thanks in advance,

Kurt

Dave Kreskowiak10-Oct-08 5:14

Dave Kreskowiak

10-Oct-08 5:14

No, it's not. All drawing happens on the UI thread, no matter what.

I thought you said you moved the long-running operation to a seperate thread and left the Scrolling Text on the UI thread.

Basically, since you have no source code or control over the control that's loading the move, it's going to do it's operation on the UI thread, no matter what you do. The only option you have is to find a control that loads it's data in it's own background thread. I don't know of any off the top of my head.

Basically, you have to get each operation you want running at the same time in it's own thread. All rendering will happen on the UI thread, no matter what. So, if any operation, like loading the movie, happens on the UI thread, all drawing for all other controls, no matter what thread they're on, will stop, until the movie is loaded.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008