Visual Basic

again stumped with arraylists

11-Apr-07 4:54

You might want to ask this question with BusinessObjects support. I don't know if CrystalReports supports inline images in RTF fields.

[EDIT]
Well, my Google-Fu has failed me but briefly. CrystalReports doesn't support any image tags in RTF data. You can find more on it here[^].

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

srikanthdevsql10-Apr-07 21:58

srikanthdevsql

10-Apr-07 21:58

This is the code:
1.Dim mm As ArrayList = New ArrayList
2.Dim i As Integer
3. For i = 0 To intTotParam - 1
mm.Add(arrInputFileData(arrPosition(i)))
Next
4. Dim ss As String() = mm.Item(0)
5. MessageBox.Show(ss(0))

I am getting the error "Specified cast is not valid" at line 4.
Actually i need to sort the arraylist and find the largest element.
Retrieving the strings that has been added in the arraylists is of primary importance in my project and needed at many places.
Please help me out

Zaegra10-Apr-07 22:04

10-Apr-07 22:04

You can't convert an object to a string just like that.
Try converting it to string format first.

srikanthdevsql10-Apr-07 22:09

srikanthdevsql

10-Apr-07 22:09

can you give me the code
for converting the object to string format
and displaying in message box

Christian Graus10-Apr-07 22:37

Re: to string cannot be used

10-Apr-07 22:37

This is why arraylist totally sucks. You can't use VB.NET 2.0 ?

object has a ToString() method, that's the best way to convert to string.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

to string cannot be used

srikanthdevsql10-Apr-07 23:52

srikanthdevsql

10-Apr-07 23:52

I tried the following
Dim ob as object
for each ob in tempArray
dim m as string
m=ob Frown | :(

next
if ob had ToString Method it should have shown...but it only has to
GetType method.
Seems there is no way to retrieve strings from the arraylists Frown | :(

_mubashir11-Apr-07 1:37

_mubashir

11-Apr-07 1:37

Try Cstr(ob)

Mubashir
Software Architect
Storan Technologies Inc, USA
Every job is a self portrait of the person who did it.

Re: to string cannot be used

Christian Graus11-Apr-07 2:00

11-Apr-07 2:00

EVERYTHING in .NET has a ToString() method. It's guarenteed.

srikanth_nair wrote:
Seems there is no way to retrieve strings from the arraylists

Rubbish. If it's a string, you can cast it to string. The issue is, the ArrayList is nasty, it stores objects, ToString would not crash, no matter what the object is.

Dave Kreskowiak11-Apr-07 4:48

Comparing images using the GetPixel method

11-Apr-07 4:48

srikanth_nair wrote:
Dim ss As String() = mm.Item(0)

It doesn't work because you tried to convert an object (you didn't say what was stored in arrPosition()), stored in element 0, to an Array of Strings as specified by your String() declaration.

I believe it should have been:

Dim ss As String = mm.Item(0).ToString()

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

database and VB.Net

Mshapis10-Apr-07 21:57

Mshapis

10-Apr-07 21:57

How do you validate users input against access database using select statement on vb.net.

LG Pikiso
DME
SDM
+27733100331

Re: database and VB.Net

Colin Angus Mackay10-Apr-07 22:17

Colin Angus Mackay

10-Apr-07 22:17

It depends how the data is structured.

Upcoming events:
* Edinburgh: Web Security Conference Day for Windows Developers (12th April)
* Glasgow: Introduction to AJAX (2nd May), SQL Server, Mock Objects

Never write for other people. Write for yourself, because you have a passion for it. -- Marc Clifton

My website

Zaegra10-Apr-07 21:56

Re: Comparing images using the GetPixel method

10-Apr-07 21:56

hello,
i have 2 images, both loaded into pictreboxes. Now, i want to compare the pixels using System.Drawing.Bitmap.GetPixel, but i don't know how to do this i tried several things like a for.. next but that didnt work so can someone please give me a code snippet on how to compare 2 images using the GetPixel method??
Thanks in advance, Zaegra

--Zaegra--

Christian Graus10-Apr-07 22:39

how to play Url through window media player

10-Apr-07 22:39

You need a nested loop to compare the x and y directions. You need to post your code for us to understand where you're failing in what is a pretty straightforward task.

onrivman10-Apr-07 21:41

onrivman

10-Apr-07 21:41

I have encorporated Window media Player in my Vb.net Project. I am getting the different different Urls and want to play through my media player. But I am not able to play these Urls through media player.Please help me .

I am storing the url in string like str
and then giving the command

windowmedia1.url=str
but it is not playing anything

namita

Re: how to play Url through window media player

Dave Kreskowiak11-Apr-07 4:46

Prevent Certain EXE program from running

11-Apr-07 4:46

I don't use MediaPlayer at all, but it would appear that you have to set the URL property, then call the Play method of the CtrlControls collection.

myPlayer.URL = "some URL..."
myPlayer.Ctlcontrols.play()

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

chitzdacs10-Apr-07 21:38

chitzdacs

10-Apr-07 21:38

Guys,
Does anyone here can help me to create a utility program in vb6 that will prevent certain exe program from running? Can anyone give me code snippets.

Thanks!
Chito

Re: Prevent Certain EXE program from running

Christian Graus10-Apr-07 22:39

Re: Prevent Certain EXE program from running

10-Apr-07 22:39

That's physically not possible. How would you hope it would work ? If it were possible, VB6 isn't going to do it.

Dave Kreskowiak11-Apr-07 4:41

11-Apr-07 4:41

You can't do what you want because you'd have to hook Windows Loader to do it. This is "black-art" type stuff that has very little to no documentation on how to do it. Any examples of hooking API functions are going to be in C++ and do things that VB6 is no capable of producing a .DLL or .EXE for.

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

How to rotate images?

Diego F.10-Apr-07 21:24

Diego F.

10-Apr-07 21:24

Hi all. I have a listview with images and my application must be able to rotate one image. I need a method to rotate 90 degrees rigth (i.e.).

Is that possible?

Regards,

Diego F.

Zaegra10-Apr-07 22:00

10-Apr-07 22:00

Try using this:
Load the image from the listview in a picturebox.
Then:
PictureBox1.Image.RotateFlip(RotateFlipType.Rotate90FlipNone)
And then load it back into the listview.
I think that might do the trick.

--Zaegra--

Diego F.10-Apr-07 22:11

Diego F.

10-Apr-07 22:11

I'm tryint that but it doesn't work

If DADLV1.SelectedItems.Count > 0 Then
Dim pb As New PictureBox
Dim indice As Integer = DADLV1.SelectedItems(0).ImageIndex

pb.Image = ImageList1.Images(indice)
pb.Image.RotateFlip(RotateFlipType.Rotate180FlipXY)

DADLV1.Refresh()
End If

Regards,

Diego F.

Christian Graus10-Apr-07 22:40

10-Apr-07 22:40

Why would you do this ?

ImageList1.Images(indice).RotateFlip(RotateFlipType.Rotate180FlipXY)

is all you need, unless it returns an image, then you may need

ImageList1.Images(indice) = ImageList1.Images(indice).RotateFlip(RotateFlipType.Rotate180FlipXY)

Zaegra10-Apr-07 22:47

10-Apr-07 22:47

Yes, i didn't think of that but that method is way better.

--Zaegra--

Diego F.10-Apr-07 23:01

Diego F.

10-Apr-07 23:01

I tried that line, but no rotation is done.

ImageList1 is the imagelist that keeps the images shown in the listview
DADLV1 is the listview

I tried also that:
Dim indice As Integer = DADLV1.SelectedItems(0).ImageIndex DADLV1.SelectedItems(0).ImageList.Images(indice).RotateFlip(RotateFlipType.Rotate180FlipXY)

But nothing occurs.

It seems quite simple. I don't know why it doesn't work.

Regards,

Diego F.