Re: How do i Multiply Bytes w/o overflow (Like char in c++) ? - Visual Basic Discussion Boards

How do i Multiply Bytes w/o overflow (Like char in c++) ?

Kobi_Z2-Aug-09 21:38

2-Aug-09 21:38

I try to translate code from c++ to vb6,

in C++ i have:
unsigned char a = 3
unsigned char b = 188
unsigned char c
c = a^b
I get an answer c = 191.

I try the same in VB6
dim a as byte
dim b as byte
dim c as byte
a = 3
b = 188
c = a^B
I get Overflow

How do i get the same result ?
i tryed using combinations with MOD 256 but no success.
thanks.

Re: How do i Multiply Bytes w/o overflow (Like char in c++) ?

Christian Graus2-Aug-09 22:00

Christian Graus

2-Aug-09 22:00

Well, your basic problem is that you're using VB6, which was always crap, and has been unsupported for a long time. Why are you still using it ?

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Re: How do i Multiply Bytes w/o overflow (Like char in c++) ?

Kobi_Z2-Aug-09 22:25

Kobi_Z

2-Aug-09 22:25

Well, it is an additional feature im adding to a program allready written in VB6.
the question is what would be easier, coverting the whole program to smth else
or just trying to fix my problem.

Re: How do i Multiply Bytes w/o overflow (Like char in c++) ?

Christian Graus2-Aug-09 22:28

Christian Graus

2-Aug-09 22:28

It depends. If the program is going to live for a long time, I'd consider converting it to a real language.

If all else fails, you can do what VB6 users always did, get a C++ dll to do the real work. I don't know why the operation you're trying is failing, I suspect the answer is that the ^ does something different in VB6 to c++.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Re: How do i Multiply Bytes w/o overflow (Like char in c++) ?

riced2-Aug-09 23:41

riced

2-Aug-09 23:41

IIRC it does.
^ in C/C++ is Bitwise Exclusive Or
^ in VB6 is exponentiation (raise to power) Big Grin | :-D

Regards
David R
---------------------------------------------------------------
"Every program eventually becomes rococo, and then rubble." - Alan Perlis

Re: How do i Multiply Bytes w/o overflow (Like char in c++) ?

dan!sh 2-Aug-09 22:43

dan!sh

2-Aug-09 22:43

"^" in C++ is bitwise XOR while in VB, it is power(exponent). Maybe that is the reason you are getting error.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

Re: How do i Multiply Bytes w/o overflow (Like char in c++) ?

Kobi_Z3-Aug-09 0:22

Kobi_Z

3-Aug-09 0:22

Yep, I eventually figured it out,
im not so familiar with c++...

thanks.

Re: How do i Multiply Bytes w/o overflow (Like char in c++) ?

KarstenK3-Aug-09 0:39

KarstenK

3-Aug-09 0:39

using VB6 is a real bad idea. Use some newer Versions as Vb.net.

Always remember VB6 code isnt portable to VB.net, so VB6 is lost.

Press F1 for help or google it.
Greetings from Germany

Which is the best and sure way to shutdown systems

Amer Rehman2-Aug-09 20:55

Amer Rehman

2-Aug-09 20:55

Hi
I need to shutdown remote systems running on windows xp with Dotnet Framework 1.1 installed. The user is limited on these machines.

I have used the following methods to shutdown the systems.

1. wmi

Dim oOS, oOperatingSystem As Object
                        oOS = GetObject("winmgmts:{(Shutdown)}").ExecQuery("Select * from Win32_OperatingSystem")

                        For Each oOperatingSystem In oOS
                              oOperatingSystem.Win32Shutdown(nForcePowerDown)
                        Next

2. shutdown.exe of xp

The problem is using the wmi sometime fails for reasons I don't know. The other method needs Admin privileges. Which is also an overhead.
What should I do? Use the API or there is some other way?

Please help as search over internet has not helped me much.

Thanks

reman

Re: Which is the best and sure way to shutdown systems

Johan Hakkesteegt3-Aug-09 1:41

Johan Hakkesteegt

3-Aug-09 1:41

Let's just assume that your reasons for wanting to do this are entirely legitimate.

Think about it, if it were possible to just shut down a remote system, without admin privileges, what would keep hackers from doing so?

My advice is free, and you may get what you paid for.

Re: Which is the best and sure way to shutdown systems

Dave Kreskowiak3-Aug-09 2:03

Dave Kreskowiak

3-Aug-09 2:03

If you want to do remote shutdown, you need Admin privileges on the remote machine to do it. There is no way around it, for obvious reasons.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

having problems (Public Shared Sub ShowTcpStatistics) Statement cannot within method body. End of method assumed// which is affecting my txtbox.Text

that_dude_tj2-Aug-09 10:59

that_dude_tj

2-Aug-09 10:59

Imports System.Net
Imports System.Net.NetworkInformation
Imports System.Text

Protected Sub Button4_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button4.Click

Public Shared Sub ShowTcpStatistics(ByVal version As NetworkInterfaceComponent)
Dim properties As IPGlobalProperties = IPGlobalProperties.GetIPGlobalProperties()
Dim tcpstat As TcpStatistics = Nothing
txtbox.Text("")
Select Case version
Case (NetworkInterfaceComponent.IPv4)
tcpstat = properties.GetTcpIPv4Statistics()
txtbox.Text("TCP/IPv4 Statistics:")
Exit Select
Case (NetworkInterfaceComponent.IPv6)
tcpstat = properties.GetTcpIPv6Statistics()
txtbox.Text("TCP/IPv6 Statistics:")
Exit Select
Case Else
Throw (New ArgumentException("version"))
' break;
End Select
txtbox.Text(" Minimum Transmission Timeout............. : {0}", tcpstat.MinimumTransmissionTimeout)
txtbox.Text(" Maximum Transmission Timeout............. : {0}", tcpstat.MaximumTransmissionTimeout)

txtbox.Text(" Connection Data:")
txtbox.Text(" Current ............................ : {0}", tcpstat.CurrentConnections)
txtbox.Text(" Cumulative .......................... : {0}", tcpstat.CumulativeConnections)
txtbox.Text(" Initiated ........................... : {0}", tcpstat.ConnectionsInitiated)
txtbox.Text(" Accepted ............................ : {0}", tcpstat.ConnectionsAccepted)
txtbox.Text(" Failed Attempts ..................... : {0}", tcpstat.FailedConnectionAttempts)
txtbox.Text(" Reset ............................... : {0}", tcpstat.ResetConnections)

txtbox.Text("")
txtbox.Text(" Segment Data:")
txtbox.Text(" Received ........................... : {0}", tcpstat.SegmentsReceived)
txtbox.Text(" Sent ................................ : {0}", tcpstat.SegmentsSent)
txtbox.Text(" Retransmitted ....................... : {0}", tcpstat.SegmentsResent)

txtbox.Text("")
End Sub

Re: having problems (Public Shared Sub ShowTcpStatistics) Statement cannot within method body. End of method assumed// which is affecting my txtbox.Text

Christian Graus2-Aug-09 11:45

Christian Graus

2-Aug-09 11:45

You should buy a very basic book and work through it berfore continuing this task.

You have a sub inside a sub. Remove the button4_click sub, or put an end sub at the bottom of it.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Re: having problems (Public Shared Sub ShowTcpStatistics) Statement cannot within method body. End of method assumed// which is affecting my txtbox.Text

Dave Kreskowiak2-Aug-09 11:46

Dave Kreskowiak

2-Aug-09 11:46

I think the cause of the error is really quite obvious. You didn't terminate your Protected Sub Button4_Click() method with an End Sub before you started with Public Shared Sub ShowTcpStatistics().

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

that_dude_tj2-Aug-09 12:32

that_dude_tj

2-Aug-09 12:32

Protected Sub Button4_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button4.Click
ShowTcpStatistics(txtB.Text)
End Sub
Public Shared Sub ShowTcpStatistics(ByVal version As NetworkInterfaceComponent)
Dim properties As IPGlobalProperties = IPGlobalProperties.GetIPGlobalProperties()
Dim tcpstat As TcpStatistics = Nothing
txtbox.Text = ""
For Each tcp As TcpStatistics In tcpstat
txtbox = tcp.ToString()

Next
Select Case version
Case (NetworkInterfaceComponent.IPv4)
tcpstat = properties.GetTcpIPv4Statistics()
txtbox.Text("TCP/IPv4 Statistics:")
Exit Select
Case (NetworkInterfaceComponent.IPv6)
tcpstat = properties.GetTcpIPv6Statistics()
txtbox.Text("TCP/IPv6 Statistics:")
Exit Select
Case Else
Throw (New ArgumentException("version"))
' break;
End Select
txtbox.Text(" Minimum Transmission Timeout............. : {0}", tcpstat.MinimumTransmissionTimeout)
txtbox.Text(" Maximum Transmission Timeout............. : {0}", tcpstat.MaximumTransmissionTimeout)

txtbox.Text(" Connection Data:")
txtbox.Text(" Current ............................ : {0}", tcpstat.CurrentConnections)
txtbox.Text(" Cumulative .......................... : {0}", tcpstat.CumulativeConnections)
txtbox.Text(" Initiated ........................... : {0}", tcpstat.ConnectionsInitiated)
txtbox.Text(" Accepted ............................ : {0}", tcpstat.ConnectionsAccepted)
txtbox.Text(" Failed Attempts ..................... : {0}", tcpstat.FailedConnectionAttempts)
txtbox.Text(" Reset ............................... : {0}", tcpstat.ResetConnections)

txtbox.Text("")
txtbox.Text(" Segment Data:")
txtbox.Text(" Received ........................... : {0}", tcpstat.SegmentsReceived)
txtbox.Text(" Sent ................................ : {0}", tcpstat.SegmentsSent)
txtbox.Text(" Retransmitted ....................... : {0}", tcpstat.SegmentsResent)

txtbox.Text("")
End Sub

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

Christian Graus2-Aug-09 13:58

Christian Graus

2-Aug-09 13:58

that_dude_tj wrote:
txtbox.Text("TCP/IPv4 Statistics:")

Does this work ? What does it do ?

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

nlarson112-Aug-09 16:26

nlarson11

2-Aug-09 16:26

not sure why he wrote that. it does not work. text has an overload but it only extracts the character position at the given number textbox1.text(3)

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

'Life's real failure is when you do not realize how close you were to success when you gave up.' ~ anonymous

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

Christian Graus2-Aug-09 16:42

Christian Graus

2-Aug-09 16:42

OK, that's interesting. It's a property AND a method ? I didn't know that. Either way, his response looked to me like a further question, but no question was present, so I was trying to guess the problem

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

nlarson112-Aug-09 17:13

nlarson11

2-Aug-09 17:13

I just tried it. It probably is 2 properties that are overloaded 'a' = text for the example

Public ReadOnly Property a(ByVal idx As Int16) As String
    Get
        'extracts character at position
    End Get
End Property

Public Property a() As String
    Get

    End Get
    Set(ByVal value As String)

    End Set
End Property

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

0x3c03-Aug-09 0:57

0x3c0

3-Aug-09 0:57

I'm not certain, but I think it's just a property. It returns String, and the String object has a built in indexer. Just like you could have a List(Of List(Of Integer)), and use lst(0)(1) and get an Integer back

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

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

that_dude_tj2-Aug-09 17:11

that_dude_tj

2-Aug-09 17:11

No not working yet it suppose to display Internet Protocol version 4 (TCP/IPv4) statistical data for the local computer to my textbox name txtbox. i used this in the ping and it worked fine

Dim ping As Ping = New Ping()
Dim pingreply As PingReply = ping.Send(txtHost.Text)
txtPing.Text &= "Address: " & pingreply.Address.ToString() & Constants.vbCr
txtPing.Text &= "Roundtrip Time: " & pingreply.RoundtripTime & Constants.vbCr
txtPing.Text &= "TTL (Time to Live): " & pingreply.Options.Ttl & Constants.vbCr
txtPing.Text &= "Buffer Size: " & pingreply.Buffer.Length.ToString() & Constants.vbCr

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

Dave Kreskowiak2-Aug-09 16:56

Dave Kreskowiak

2-Aug-09 16:56

So what's this?? You didn't ask a question and I'm not inclined to just start throwing test apps together to guess what you want out of this...

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

that_dude_tj2-Aug-09 17:01

that_dude_tj

2-Aug-09 17:01

lol my question is then i would be. that im unable to display the tcp statistics in my text box

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

Christian Graus2-Aug-09 17:07

Christian Graus

2-Aug-09 17:07

I responded four hours ago to try to keep helping you, but you didn't even reply ?

You need to read a pretty basic VB.NET book. You seem to be making code up instead of knowing what you're doing. The best way to do what you want, is use a StringBuilder to build the message, as it's multiline from what I can tell, and then set that text to the Text property.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Re: txtbox.Text ="" Cannot refer to an instance member of a class from within a shared method or shared member initializerxt without an explicit instance of the class.

that_dude_tj2-Aug-09 17:12

that_dude_tj

2-Aug-09 17:12

Thanks ill get to reading

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.