Visual Basic

Re: GDI+ problem? [modified]

25-Jun-09 4:30

O.G.I. wrote:
I'm currently learning C++ but I'm only on the beginning so I can't move that fast to XNA, cause as I know XNA requires C++ or C#.

Nothing like trial by fire right? You could always give a try and post questions when you get stuck.

Ping compression details

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison

Luc Pattyn25-Jun-09 4:36

Luc Pattyn

25-Jun-09 4:36

Hi,

I don't see where the image's fileformat would be relevant, assuming you load the images into memory once (hence outside your drawing methods), which turns them into uncompressed bitmaps anyway, e.g. using Bitmap bm=Bitmap.FromFile(filepath); or something similar with FromSream. (example is C# syntax!).

PS: I strongly object to your code swallowing exceptions; if you (think you) need a try-catch, then do something useful with the exception, e.g. display it's Exception.ToString().

[ADDED]And if there is a very specific exception that you rightfully want to ignore, add a catch for that specific exception and insert a comment as to why it is OK to ignore it; then leave the more general catch out, or put some code in it.
[/ADDED]

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.

modified on Thursday, June 25, 2009 10:44 AM

tree view node click event

bhargava240925-Jun-09 0:11

25-Jun-09 0:11

how can i fire a form through tree view node click event.

dan!sh 25-Jun-09 1:11

dan!sh

25-Jun-09 1:11

Create object of the form and use Show or ShowDialog method (as applicable).

bhargava240925-Jun-09 1:16

25-Jun-09 1:16

thanks for u r replay my problem is in the tree node selction program

Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect
Dim childnum, index As Int32
childnum = TreeView1.SelectedNode.GetNodeCount(False)
index = TreeView1.SelectedNode.Index
'index = index + 1

If index = 0 Then
Button2.Show()
GroupBox1.Show()
End If
End Sub
The Above function is not working for me to select tree node and fire,is there any thing wrong in tn my prg.

Jon_Boy25-Jun-09 1:39

25-Jun-09 1:39

I'm not sure I'm completely following you here. The controls are displayed when the index is 1 right? What else are you expecting to occur?

Also, check that you have at least 2 nodes in the treeview since the index is zero based.

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison

bhargava240925-Jun-09 1:59

25-Jun-09 1:59

I tried the aabove code by making a button visable false and on selcting a perticular treenode it will appear but the same code is not working for the group box that consits of some group of buttons.
I want make that group box visable when i click on a perticular treeview node.

bhargava240925-Jun-09 2:00

25-Jun-09 2:00

Jon_Boy25-Jun-09 2:08

25-Jun-09 2:08

Your code looks like it should work. Check the visible property (should be true) on the button controls in the group box to see if visible = true. If not, you'll need to change that at design time or during run time looping the groupbox's control collection.

Quick test app you can do.

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    'add a group box and stuff with button controls
    For Each ctl As Control In GroupBox1.Controls
        ctl.Visible = True
    Next

    GroupBox1.Visible = False
End Sub

Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect
    If e.Node.Index = 5 Then
        GroupBox1.Visible = True
    End If
End Sub

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison

bhargava240925-Jun-09 2:27

25-Jun-09 2:27

Thanks Jon_Boy Your code is working for me. Smile | :)

Re: Link dialog (Hyperlink)

dan!sh 25-Jun-09 1:59

dan!sh

25-Jun-09 1:59

TreeViewEventArgs has all the properties you need. You can use them right away.

Apart from that what exactly is the problem you are facing.

Link dialog (Hyperlink)

jinxster24-Jun-09 15:37

jinxster

24-Jun-09 15:37

How does one initiate windows hyperlink dialog selector. By this I do not mean the link label. There is a dialog that is called in C++ with "using (LinkDialog dlg = new LinkDialog())"

With the other dialogs you (color, font, etc) you add them via a control in the toolbox, but I do not find a LinkDialog.

Many thanks

Christian Graus24-Jun-09 16:20

Christian Graus

24-Jun-09 16:20

There is no using statement in C++. Also, if a control exists in MFC, does not mean it exists in .NET. Do you have a link to the control you want, in MSDN ?

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

Re: Link dialog (Hyperlink)

jinxster24-Jun-09 19:05

jinxster

24-Jun-09 19:05

Hi Christian,

Ok you are correct. I am currently busy converting a project from C++ to VB.NET (why I dunno but here I find myself doing this) I only notice now amongst the millions (ok not quite millions) of classes and forms and other resources that the previous guy made a LinkDialog class which basically has a textbox to indicate what text must be show and a URL textbox for the link and a dropdown to select target. So that is where it comes from.

So basically I just make another one. Thank you

Use same DLL instance accross separate applications

jwhite638824-Jun-09 11:42

jwhite6388

24-Jun-09 11:42

Program that someone else wrote. (ProgA)
Program that I wrote. (ProgB)
DLL that someone else wrote (i have the cls file) and I have modified. (DLL1)

I have sample code with an attempt to accomplish my goal if needed.

When ProgA sends a message to DLL1, I need ProgB to see the results of the call from ProgA to DLL1.

Re: Use same DLL instance accross separate applications

Christian Graus24-Jun-09 15:12

Christian Graus

24-Jun-09 15:12

A dll can't call your main app. So, you want to load the same dll instance into both programs. I am not sure if that is possible. Your best bet IMO would be for the dll to use WM_COPYDATA or similar to communicate with the other program, or create some sort of shared storage for the dll to use between instances.

Re: Use same DLL instance accross separate applications

Jon_Boy25-Jun-09 1:29

Getting pixel colors in VB.NET

25-Jun-09 1:29

Agreed in that there should be some way to store the info so that both apps can access it.

Is it possible to relaunch app2? If so, you could restart app2 and pass in command line args to have it process whatever needs to be done.

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison

vidguy24-Jun-09 5:23

vidguy

24-Jun-09 5:23

My goal is to get the RGB colors of a pixel when I click in a picturebox. Every piece of code I've been able to try or find doesn't work. The bit below uses the GDI GetPixel function and should work but returns an Overflow error. I'm using VB 2008 Express.

Dim p As Point = picbox.PointToClient(MousePosition)
Dim g As Graphics = picbox.CreateGraphics()
Dim pbdc As IntPtr = g.GetHdc()
Dim c As Color = ColorTranslator.FromWin32(GetPixel(pbdc, p.X, p.Y))
g.ReleaseHdc(pbdc)

Re: Getting pixel colors in VB.NET

0x3c024-Jun-09 5:38

0x3c0

24-Jun-09 5:38

You seem to be trying to get a pixel from picBox's display context. Is this what you want? If so, then you can simple use (picBox.Image as Bitmap).GetPixel(p.X, p.Y) instead. However, that's just the basic idea. You'll probably want to split it up into separate lines, and add a null-check from picBox.Image. If that's true, you'd probably just want to return a color with 0 transparency

Between the idea
And the reality
Between the motion
And the act
Falls the Shadow

Re: Getting pixel colors in VB.NET

vidguy24-Jun-09 6:03

vidguy

24-Jun-09 6:03

Thanks Computafreak, that did the trick. It's always the simplest answer that's the right one.

i want code please someone help

harieshkumar.n24-Jun-09 2:28

harieshkumar.n

24-Jun-09 2:28

Public Function DecryptString128Bit(ByVal vstrStringToBeDecrypted As String, ByVal vstrDecryptionKey As String) As String

Dim bytDataToBeDecrypted() As Byte
Dim bytTemp() As Byte
Dim bytIV() As Byte = {121, 241, 10, 1, 132, 74, 11, 39, 255, 91, 45, 78, 14, 211, 22, 62}
Dim objRijndaelManaged As New RijndaelManaged()
Dim objMemoryStream As MemoryStream
Dim objCryptoStream As CryptoStream
Dim bytDecryptionKey() As Byte

Dim intLength As Integer
Dim intRemaining As Integer
Dim intCtr As Integer
Dim strReturnString As String = String.Empty
Dim achrCharacterArray() As Char
Dim intIndex As Integer

bytDataToBeDecrypted = Convert.FromBase64String(vstrStringToBeD...

intLength = Len(vstrDecryptionKey)

If intLength >= 32 Then
vstrDecryptionKey = Strings.Left(vstrDecryptionKey, 32)
Else
intLength = Len(vstrDecryptionKey)
intRemaining = 32 - intLength
vstrDecryptionKey = vstrDecryptionKey & Strings.StrDup(intRemaining, "X")
End If

bytDecryptionKey = Encoding.ASCII.GetBytes(vstrDecryptionKe...

ReDim bytTemp(bytDataToBeDecrypted.Length)

objMemoryStream = New MemoryStream(bytDataToBeDecrypted)

Try

objCryptoStream = New CryptoStream(objMemoryStream, objRijndaelManaged.CreateDecryptor(bytDe... bytIV), CryptoStreamMode.Read)

objCryptoStream.Read(bytTemp, 0, bytTemp.Length)

objCryptoStream.FlushFinalBlock()
objMemoryStream.Close()
objCryptoStream.Close()

Catch

End Try

Return (Encoding.ASCII.GetString(bytTemp))

End Function

i have got this cod to encrypt a string i want it to be written in perl

Is it possible
can anyone help me out with this please
help me iam shaking my head for about a weak to do tyhis

Re: i want code please someone help

Jon_Boy24-Jun-09 2:38