Visual Basic

26-Jan-06 17:48

Hi, now I have a sequence of bitmaps, I am wanting to put those into an AVI stream.
I have read about avifil32.dll but cant find it or any useful examples for .NET 1.1. And wasnt that impressed with Windows Media SDK. As I dont need all those other functions.
Images will be taken maybe 2 - 10 times a second.
Can anyone tell me or link me up to how to use and set up avifile32?
thanks,
Brian

Joshua Quick26-Jan-06 19:31

26-Jan-06 19:31

I've found a couple good articles about using this AVI library here on CodeProject. The code is written in C#, but it's still .NET and just as helpful.

http://www.codeproject.com/cs/media/aviFileWrapper.asp[^]

http://www.codeproject.com/csharp/steganodotnet4.asp[^]

bskirkman26-Jan-06 23:08

26-Jan-06 23:08

ah, I should have mentioned it in my first post, I seen how to use the library in those ones, but dont know how to convert those parts, pointers or IntPtr to the VB version... maybe I can find a C# to VB converter?

bskirkman26-Jan-06 23:37

26-Jan-06 23:37

To show where I need to start from:
where do i find avifil32?
I try:

Declare Function AVIFileInit Lib "avifil32.dll" Alias "AVIFileInit" ()<br />
'or<br />
Declare Function AVIFileInit Lib "avifil32.dll" Alias "AVIFileInit" ()<br />
'and later call<br />
AVIFileInit()

but that crashes and gives;
An unhandled exception of type 'System.Runtime.InteropServices.MarshalDirectiveException' occurred in WindowsApplication2.exe
Additional information: PInvoke restriction: can not return variants.

How to do this basic thing? thanks

bskirkman27-Jan-06 0:04

27-Jan-06 0:04

<br />
Declare Sub AVIFileInit Lib "avifil32" ()<br />

Joshua Quick27-Jan-06 6:51

27-Jan-06 6:51

Here's an idea.
Instead of converting the C# code to VB, create a C# "Class Library" project in your solution. You can then add the C# avi library wrapper to your C# class library and use it from your VB code.

Selectionformula

Swiss Mantoro26-Jan-06 16:11

Swiss Mantoro

26-Jan-06 16:11

Dear all

I had installed new visual studio.net 2005 into my PC and I have tried to open my old program which was I made under visual studio.net 2003, everything was running well until I tried to run my report form which was connected to my report form made under crystal report sheet.
I couldn't run selectionformula, to present all my data from my database to my report sheet as I wanted. Here is I treid to give you a small part of my program
I have a textbox1 in my form which is I will use as my parameter to order crystalreport to present data as I need base on the contains of that textbox1. and the list of my program are :

If textbox1.text="ALL" then
crinv.SelectionFormula= ""
crinv.RefreshReport()
Else
crinv.SelectionFormula="{inventory.invcod)='" & Me.textbox1.Text & "'"
crinv.RefreshReport()
Endif

I can get all data from my data base if I type "ALL" into Textbox and I can get the data base on inventroy code which I typed on textbox1 as well when I still use Visual studio 2003, but now I could not get any data with the same command under visual studio 2005. My question is
Could you please to give me information how to use the right SelectionFormula command in Visual studio.Net 2005, that I can present all information from my database ?
I do hope you will understand what I mean with my poor english. Thank you for your attention

Best regards

ICE

Re: Selectionformula

Joshua Quick26-Jan-06 19:36

26-Jan-06 19:36

Swiss Mantoro wrote:
crinv.SelectionFormula="{inventory.invcod)='" & Me.textbox1.Text & "'"

I noticed that your string doesn't end with a curly bracket "}". Perhaps that's why it fails? Smile | :)

Re: Selectionformula

Swiss Mantoro26-Jan-06 20:13

Swiss Mantoro

26-Jan-06 20:13

Thank you for your reply but actually I used the curly bracket in my real program, but for this line program was not problem, I just concern to program line which tell, crinv.selectionFormula="".

In my previous visual studio.net version whole those program was running well, but I have no Idea why it doesn't running in version of 2005.

Thank you

ICE

Re: Selectionformula

Joshua Quick26-Jan-06 20:34

Is it possible? Screen Capture Form behind Form or window

26-Jan-06 20:34

Perhaps this is an issue that you need to raise with the makers of Crystal Reports, at www.businessobjects.com.

I just quickly ran through there website and found a PDF talking about a couple issues with SelectionFormula on WebForms. Didn't look related to your issue, but it confirms that there are known bugs.
http://www.businessobjects.com/global/pdf/dev_zone/VS2005_Release_Notes.pdf[^]

Add-in Manager

Ekans26-Jan-06 13:35

Ekans

26-Jan-06 13:35

Hi there,
can anyone tell me how can i load the Package and Deployment Wizard in the Add-in Manager in VB.net?
This is to create an setup.
Thanks

Re: Add-in Manager

Patola26-Jan-06 14:01

Patola

26-Jan-06 14:01

I have the same problem!I pass to VB.net recently and i don´t know how to use the add-in manager! Frown | :(

In VB 6 it wasvery simply.

bskirkman26-Jan-06 12:15

Re: Is it possible? Screen Capture Form behind Form or window

26-Jan-06 12:15

Hi every1, does anyone know if it is possible to capture an image of a form that is behind another form or window?
If this is possible I later want to turn it into video capture of the selected window.
TIA,
Brian

Christian Graus26-Jan-06 12:52

Christian Graus

26-Jan-06 12:52

You want to capture video of a window, which is not visible ?

No - a window that is not visible is not being painted, so there's nothing to capture.

Christian Graus - Microsoft MVP - C++

Re: Is it possible? Screen Capture Form behind Form or window

bskirkman26-Jan-06 12:58

Re: Is it possible? Screen Capture Form behind Form or window

26-Jan-06 12:58

Thanks for fast reply.
Then is there some way to paint this to a 'magical' spot that cant be seen and take the image capture from their?
thanks.

Christian Graus26-Jan-06 13:03

Christian Graus

26-Jan-06 13:03

I dunno what would happen if you moved the window outside the bounds of the screen, but it would be a failure on the part of windows if it was painted there. I very much doubt it's easily achieved. If you could pass a DC to the paint event of the control, perhaps it would draw on it, but that would only be the client area, and it's just an idea, I dunno if it would work.

Christian Graus - Microsoft MVP - C++

Re: Is it possible? Screen Capture Form behind Form or window

bskirkman26-Jan-06 13:21

Re: Is it possible? Screen Capture Form behind Form or window

26-Jan-06 13:21

Hi again, fast response good. This solution seems to work:

<br />
        Private Declare Function PrintWindow Lib "user32.dll" (ByVal _<br />
              hwnd As IntPtr, ByVal hdcBlt As IntPtr, ByVal nFlags As _<br />
              UInt32) As Boolean<br />
        Dim screenGrab As Bitmap<br />
        Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click<br />
            Me.SendToBack()<br />
            screenGrab = New Bitmap(Me.Width, Me.Height)<br />
            Dim g As Graphics = Graphics.FromImage(screenGrab)<br />
            Dim hdc As IntPtr = g.GetHdc<br />
            Me.PrintWindow(Me.Handle, hdc, Nothing)<br />
            g.ReleaseHdc(hdc)<br />
            g.Flush()<br />
            g.Dispose()<br />
            screenGrab.Save("C:\please.bmp", System.Drawing.Imaging.ImageFormat.Bmp)<br />
        End Sub<br />

havent tested if thouroughly, but seems ok, howd anyone else run this?

Christian Graus26-Jan-06 13:30

Christian Graus

26-Jan-06 13:30

OK - looks like the Windows API exposes this ability ( to force a paint event ). Cool.

Christian Graus - Microsoft MVP - C++

Re: Is it possible? Screen Capture Form behind Form or window

Joshua Quick26-Jan-06 13:46

Re: Is it possible? Screen Capture Form behind Form or window

26-Jan-06 13:46

Here is another method.
If you're using .NET 2.0, then you can call the new Form.DrawToBitmap() function.

bskirkman26-Jan-06 13:48

Re: Is it possible? Screen Capture Form behind Form or window

26-Jan-06 13:48

thanks for another response, unfortunately cant test this out on .net 1.0.

How would I convert the previous code to remove the Title bar from that captures?

Joshua Quick26-Jan-06 14:13

Re: Is it possible? Screen Capture Form behind Form or window

26-Jan-06 14:13

What you want is just the "client" area inside of the window. I don't know what managed calls you can make to access the handle of the client window.

I've found this on the Internet. Perhaps this will do the trick?
http://www.vbdotnetheaven.com/Code/Jul2003/2128.asp[^]

bskirkman26-Jan-06 14:17

Re: Is it possible? Screen Capture Form behind Form or window

26-Jan-06 14:17

thanks, using screenGrab = New Bitmap(Me.ClientSize.Width, Me.ClientSize.Height) i do get the smaller area, but it cuts the bottom and right side area off rather then all edges.

Joshua Quick26-Jan-06 14:44