Re: MySQL Visual Basic API compunent control - Visual Basic Discussion Boards

The real $M@24-Dec-07 2:47

24-Dec-07 2:47

Merry Christmas to everyone!

Don't you know how I can get the image my form looks like?
I've tried DrawToBitmap method, but with that I didn't get the graphics, just the controls.
Please help if you can.

Re: Get graphics

Paul Conrad24-Dec-07 5:11

Paul Conrad

24-Dec-07 5:11

What is it you are trying to do? Put a picture on the form or as a background for the form?

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: Get graphics

The real $M@26-Dec-07 3:14

The real $M@

26-Dec-07 3:14

Sorry I didn't write clearly, my problem is the following:
I've a form, and controls in it. I want to get the same image that the user sees on the screen. If I don't use graphics, I can use DrawToBitmap method. But what should I do if I use graphics too??? D'Oh! | :doh:

Re: Get graphics

Luc Pattyn24-Dec-07 5:12

Luc Pattyn

24-Dec-07 5:12

Hi,

if you do the graphics correctly, you will catch it. Here is a tiny paint instruction:

there are several steps to draw something so it becomes visible on the screen:
1.
decide upon what object you want to draw; it normally is a Control (e.g. a Panel) or a
Form itself. I prefer to add a Panel to a Form, then draw on the Panel.

2.
create some variables (Rectangle, struct, class, whatever) that hold the parameters of
your drawing. For a rectangle that could be top and left coordinate, and width+height,
or just a Rectangle. etc.

3.
create a Paint handler for that Panel, and do all your drawing in there, using the
Graphics class and your variables.

4.
when you want to change things, modify the variables and call Panel.Invalidate() or
one of its overloads (for selective invalidation).

5.
If you want to animate things, perform the move (step 4) inside the Tick handler
of a Windows.Forms.Timer

BTW: if you need to create some objects (Fonts, Pens, Brushes, ...) either keep them
alive in class members (hence create them only once); or create them inside the Paint
handler and don't forget to call Dispose() on them.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Happy Holidays!

Serializable control.

divyesh143224-Dec-07 1:19

divyesh1432

24-Dec-07 1:19

Hi,

I want to serialize a control.

I could not Serialize control datatype but I have created a Serializable() class that has a property that holds my control and I tried to Serialize object of that class but still not working.

Here is source.

<Serializable()> Private Class Slide_Master
Dim _Main_Panel As Object
Public Property Main_Panel() As Object
Get
Return _Main_Panel
End Get
Set(ByVal value As Object)
_Main_Panel = value
End Set
End Property
End Class

'Serializable class

'Code for writing in file

Dim sm As New Slide_Master
sm.Main_Panel = CType(pnlMain, Object)
Dim str As IO.Stream = IO.File.OpenWrite(Application.StartupPath + "\chl.dat")
Dim formatter As New System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
formatter.Serialize(str, sm)
str.Close()

Help me out

Re: Serializable control.

Manikandan.net25-Dec-07 22:57

Manikandan.net

25-Dec-07 22:57

control class is doesnt have Serializable attribute. so you cant serialiaze i guess. is anyone know other method?

Manikandan.net
[Coding is life]

MySQL Visual Basic API compunent control

cedonulfi23-Dec-07 22:49

cedonulfi

23-Dec-07 22:49

please, help me.
i want to add component control: mySQL VB API v2.0.0 in VB6.
But, mySQL VB API is not listed on component control.
How to make it listed?
I've register myVBQL.dll, and could not be loaded...

Please... help me...

Re: MySQL Visual Basic API compunent control

Dave Kreskowiak24-Dec-07 4:59

Dave Kreskowiak

24-Dec-07 4:59

I haven't used VB6 in so long... Try right-clicking the ToolBox, there should be something like "Add/Remove Item". Click it. A dialog should open up and you can find the MySql components, if they're exposed as such...

A guide to posting questions on CodeProject[^]

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

Re: MySQL Visual Basic API compunent control

nishkarsh_k24-Dec-07 18:05

nishkarsh_k

24-Dec-07 18:05

Hi
I am not using VB for some time now i do not remember exact menu option but may be the input will give u some idea..

go to project menu u have add component something like that.. There it lets u browse and select the dll to be added

Good luck

Try and Catch

nishkarsh_k23-Dec-07 20:38

nishkarsh_k

23-Dec-07 20:38

Hello every one

I am having a VB.net 2005 Express application.. I was having some issues with database connection and the way I was handling the errors

Now with some input I am using try and catch… Following is what I want to do

Execute Query

If any DB connection Error Display Retry Msgbox

If retry clicked then close the connection and open it again

If no error the execute the query If error for three times then close the application

Can any one plz help me to put these steps in nested Try and Catch

Re: Try and Catch

Michael Sync23-Dec-07 21:25

Michael Sync

23-Dec-07 21:25

Try this concept..

<br />
Public Function YourFunction() as Boolean<br />
  Try<br />
     If ConnIsOpened then Close<br />
     OpenConnection<br />
     Execute SQL<br />
     CloseConnection <br />
  Catch ex as Exception <br />
    If(Messagebox.Show("There is some errors, Do you wanna try again?",,,YesNoButton) = YesButton) then<br />
       YourFunction()<br />
    End If <br />
  End Try<br />
End Function

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

webusercontrols

mvkrishnas23-Dec-07 17:01

mvkrishnas

23-Dec-07 17:01

how to add dynamically the usercontrol's to the page when ever the button click then only add the webusercontrol's to the page

Re: webusercontrols

Michael Sync23-Dec-07 21:21

Michael Sync

23-Dec-07 21:21

Try LoadControl("/yourusercontrol.ascx")

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

adding control's with out refreshing the page in asp.net

mvkrishnas23-Dec-07 16:58

mvkrishnas

23-Dec-07 16:58

Dynamicaly adding control's with out refreshing the page

Re: adding control's with out refreshing the page in asp.net

Michael Sync23-Dec-07 21:20

Michael Sync

23-Dec-07 21:20

You can only add the javascript or html control without refreshing the page.. If you want to add the server control, I think it will be too difficult.. You may want to check the ASP.NET Ajax...

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Re: adding control's with out refreshing the page in asp.net

Manikandan.net25-Dec-07 22:55

Manikandan.net

25-Dec-07 22:55

use Java script to add the control dynamically, without refreshing the page.

example:

<br />
 <div id="panel"></div><br />
    <script language="javascript"><br />
    var btn=document.createElement("input");<br />
    btn.type="button";<br />
    btn.value="Click me";<br />
    btn.onclick=function()<br />
    {<br />
    alert("Btn Clicked");<br />
    }<br />
    panel.appendChild(btn);<br />
    </script><br />

Manikandan.net
[Coding is life]

security issue

Tauseef A23-Dec-07 16:47

Tauseef A

23-Dec-07 16:47

hi guys ,,

i am having some security issues on dot net 2.0,

i am running exe of my project from a shared location on my lan but i get some
security rellated errors ,"unveriafiable code.", but when in frame configuration i make

trusted level full of the intranet zone i get no error and it works fine, but it gives me more
probelms, do i have to make these setting on individual pc(too hard)?
simply is there any way that i could make my assemblies to run in partial trusted zones?

thansk in advance

Re: security issue

Dave Kreskowiak24-Dec-07 4:37

Dave Kreskowiak

24-Dec-07 4:37

ghumman63 wrote:
do i have to make these setting on individual pc(too hard)?

Yes.

ghumman63 wrote:
simply is there any way that i could make my assemblies to run in partial trusted zones?

Nope. You'd still have to go to each machine and tell it to trust that assembly.

If the machines are in a domain environment, then it's easy to do with a group policy.

Read this[^], then this[^], and then this[^].

Basically, you have to tell the machines to trust any assembly signed with a certain key.

A guide to posting questions on CodeProject[^]

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

Re: security issue

Tauseef A25-Dec-07 16:08

Tauseef A

25-Dec-07 16:08

thanks for your cincideration,

but any guide about doing that (group policy) any hepling stuff or web link,,

thanks in advance

hello

Re: security issue

Dave Kreskowiak26-Dec-07 2:07

Dave Kreskowiak

26-Dec-07 2:07

Google results for "Introduction to group policy[^]".

A guide to posting questions on CodeProject[^]

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

Delegate writing to another form?

cstrader23223-Dec-07 11:45

cstrader232

23-Dec-07 11:45

Can I use a delegate to write to a textbox on a 2nd form from a running subthread on the first form?

For instance, this code works fine to write from the thread to Me.Textbox1. However, if I change Me.Textbox1 to Form2.Textbox1 then the delegate does not write to that textbox on Form2 (no error, just blank textbox).

Thanks!

Public Sub ThreadProcSafe()
Me.SetText("This text was set safely.")
End Sub

Private Sub SetText(ByVal [text] As String)
If Me.TextBox1.InvokeRequired Then
Dim d As New SetTextCallback(AddressOf SetText)
Me.Invoke(d, New Object() {[text]})
Else
Me.TextBox1.Text = [text]
End If
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.demoThread = New Thread(New ThreadStart(AddressOf Me.ThreadProcSafe))
Me.demoThread.Start()
'Form2.Show()
End Sub

Re: Delegate writing to another form?

Paul Conrad23-Dec-07 14:00

Paul Conrad

23-Dec-07 14:00

I think you can. But I've always heard that crossing over threads is not the best, though.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Re: Delegate writing to another form?

nlarson1123-Dec-07 15:42

nlarson11

23-Dec-07 15:42

yes but before you can access the textbox properties, you must do an invoke to get the population of the textbox onto the main thread...

'Never argue with an idiot; they'll drag you down to their level and beat you with experience.' ~ anonymous

Release an app from an appdomain

cstrader23223-Dec-07 9:38

cstrader232

23-Dec-07 9:38

I'd like to be able to load an assembly and then unload it, thereby allowing the user to edit and recompile the assembly (via Codeprovider). Then I want to reload the new recompiled assembly.

But the unload statement below doesn't free the .dll so that I can write to it again.

Is there a way to do this?

thank you!

Dim SubDomain As AppDomain
Dim as1 As Assembly = Reflection.Assembly.ReflectionOnlyLoadFrom(TypeToOpen & ".dll")
StrategyClass = SubDomain.CreateInstanceAndUnwrap(as1.FullName, "Strategies.Strategy")
AppDomain.Unload(SubDomain)

Re: Release an app from an appdomain

Luc Pattyn23-Dec-07 13:28

Luc Pattyn

23-Dec-07 13:28

Hi,

AFAIK AppDomain.Unload is the only way to get rid of a loaded DLL.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Happy Holidays!

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