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hi friends hi all ![Rose | [Rose]](https://codeproject.freetls.fastly.net/script/Forums/Images/rose.gif) ?
for experts in VB.NET
please somebody helps me
am wana to develope web application (if i can say that ) to access a CAMERA through web
this camera fixed on two stepper motors which allowing the camera to move in the XYZ-axes
all these things connected to PC parallel port
so,i want to control the video from the camera and also the orientation of the stepper motor
please some body help me
my email is : dream2be2009@yahoo.com
my thanx for all
bye
Dream2be2009@yahoo.com
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google inpout.dll
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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A company called Axis Communications has both video servers which you can attach a camera to and also video cameras with Pan, & Tilt which you can control through VB.net. They also have some very good sample VB.net code that shows how to do all of this.
You can't use the parallel port though, but you can access them through a URL address.
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As anyone have sugestions how to start a invisible windows application?
Thanks.
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Invisible to who ?
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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Define "invisible" and what do you want this app to do?
Normally, I'd suggest writing it as a service application, but you haven't supplied enough information to suggest anything, really.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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OK sorry
I' am talking, about the property Form1.visible=False in VB6
For example
Starting a aplication with a system tray icon without showing the form at start in VB.NET .
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WHich is it? VB6 or VB.NET? Are you trying to make a tray icon application?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hello
Write the function in Module Main dont call form Call all function in module if your application doesn't containe getting input from user
Ishak
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I don't know if you ever got an answer you can use or if you finally figured out what to do, but if you want a form to start out invisible you set the Opacity = 0. If you want to see it again, set Opacity=100,
I have an app that I start with an "invisible form" (Opacity=0) and then I have it start another program which is visible. It works fine and has lasted a long time.
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well i am a student and new in vb.net. my requirement is such that,i have generated a datatable dynamically because my need is such that the number of columns in my table keep on variating depending on the user input...
actully i have several components per course and the no. of components keep changing and hence the number of marks given to students for the same components.
i am able to make the datatable on the fly in accordance to the user input but now i want to generate a crystal report... so that i can print it.
any help in this would be useful to me
thanks
puneet
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Help with what? You haven't asked a question specific enough to answer in a forum.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi,
I am trying to run a job that creates a new Thread but I don't know how to pass a value to this thread. I would like to pass a parameter to the TestThread(byval MyVal) Sub but if I try to add MyVal to "Thread(AddressOf testThread(myVal))" I get "AddressOf operand must be the name of a method..."
Here is what I have so far.....
Private Sub Button2_Click(...)
For i As Integer = 0 To 100
pvFile = "D:\Test\" & "test_" & i & ".txt"
Dim t As Thread = New Thread(AddressOf testThread(myVal))
t.Start()
Next
End Sub
Private Sub TestThread(ByVal MyVal as String)
Dim fi As FileInfo = New FileInfo(MyVal)
fi.Create().Close()
End Sub
Any help would be appreciated
thanks,
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It is not possible to pass values to threads.
You can do this:
Private MyVal as String
Private Sub Button2_Click(...)
For i As Integer = 0 To 100
pvFile = "D:\Test\" & "test_" & i & ".txt"
'You pass the value MyVal to a private field
MyVal="what ever"
Dim t As Thread = New Thread(AddressOf testThread)
t.Start()
Next
End Sub
Private Sub TestThread()
Dim fi As FileInfo = New FileInfo(MyVal)
fi.Create().Close()
End Sub
This is the easiest way
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Thanks for responding.
Is there a way to make the "MyVal" private to each thread. I ran it and mutiple threads picked up the same filename which in turned caused an error because threy were trying to access the same file.
Thanks,
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You'll have to encapsulate the threaded code in its own class.
Something like this (untested code):
Imports System
Imports System.Threading
Public Class ThreadWork
Public MaxLoop As Integer
Public Shared Sub DoWork()
Dim i As Integer
For i = 0 To MaxLoop
Console.WriteLine("Working thread...")
Thread.Sleep(100)
Next i
End Sub 'DoWork
End Class 'ThreadWork
Class ThreadTest
Public Shared Sub Main()
Dim i As Integer
For i = 10 To 20
Dim myThreadDelegate As New ThreadStart(AddressOf ThreadWork.DoWork)
Dim myThread As New Thread(myThreadDelegate)
myThread.MaxLoop = i
myThread.Start()
Next i
End Sub 'Main
End Class 'ThreadTest
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Thanks for the sample. I tried it, though, and found that some of the threads were still, in my scenario, trying to access the same file. It works if I set a high enought sleep value.
I opted to pass the filenames at the thread name insteads. This way I do not need a sleep value and no thread would have the same name.
Private Sub btnCreateFile_Click(...)
For i as integer = 1 to 100
TheThread("D:\Test\File_" & i ".txt")
Next
End Sub
Public Shared Function TheThread(ByVal FileName As String)
Dim ThreadCaller As New Thread(New ThreadStart(AddressOf ProcessThread))
ThreadCaller.Name = FileName
ThreadCaller.Start()
End Sub
Private Shared Sub ProcessThread()
File.Create(Thread.CurrentThread.Name).close
End Sub
Do you see any issues with doing it this way? So far it's been working for me.
Thanks,
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Thread names can only be 31 characters long. I hope your design takes this into account...
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Do you know of another property of a thread I could set to accomplish the same task without the 31 character limitation?
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I already showed you how to do it.
Using Thread properties to pass parameters is very poor practice.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Is there any one how can give me an idea how to convert a string containing "ToDay()" to the expresion ToDay(). For example:
Dim str as string = "ToDay()"
dim newstr as string = ???str??? 'newstr=9/2/2005
Thanks
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Maybe if you can give a brief explanation of what you are trying to accomplish with this, an answer may be found.
Your example just creates two strings but there's no explanation of what they are for.
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Dear numbrel,
Thank you for your reply. Here is a more detail explanation. The first string contain an expresion, for examble TODAY() or NOW() etc. I am looking a way to use the contents of this string as a vb.net command and give the result to the second string.
I hope this is more clear to you.
Regards zaxos
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zaxos,
It's still not total clear. Maybe if we start at the end.
You want a string containing the result from a function called using the first string.
You can't hard code the function call because....?? Maybe you want to use different functions and you want to use a variable for the function name (the first string is a variable?)
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Yes I want a string containing the result from a function called using the first string. More precicely I dont want the contents of the string
"TODAY()" but the result of the function TODAY().
Regards zaxos
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