Visual Basic

Dave Kreskowiak17-Jul-05 11:18

17-Jul-05 11:18

Rob Graham wrote:
I disagree. One can write really slow code in assembly language just as easily as any language. the advantage a high level language brings is that the compiler can often generate fast machine code by optimizing even poor high level language code.

Why do you think I put "proper coding technique" above all else?!?!?!?! Any idiot can write bad code in any language.

Rob Graham wrote:
The speed of .Net apps comes from the runtime compiler which compiles the IL to machine code. Since it is runtime, it can take advantage of machine specific optimizations, and so sometimes generate code that is faster than the equivalent C or c++ code that was precompiled for a general target.

The best optimizers on earth can't make up for bad coding technique in the first place.

Rob Graham wrote:
As a result, VB and C# are, for all pratical purposes, equivalent: both generate IL, which is compiled by the same runtime compiler at runtime, and so are almost certain to produce code that runs with the same efficiency.

Isn't that exactly what I said???

Why, again, do you disagree? Confused | :confused:

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Rob Graham17-Jul-05 14:14

Rob Graham

17-Jul-05 14:14

The only comment I disagreed with was the 'closer to the machine' comment (I should have made that clearer than just quoting it). IMO closer to the machine in no way gaurantees more speed. I have seen som real crap in assembly language, as well as some remarkably fast and brilliant code in high level languages. I heartily agree that good coding practice - and good design - is the most important factor in both speed and robustness, regardless of language.
Rose | [Rose]

Absolute faith corrupts as absolutely as absolute power
Eric Hoffer
The opposite of the religious fanatic is not the fanatical atheist but the gentle cynic who cares not whether there is a god or not.
Eric Hoffer

Christian Graus17-Jul-05 18:06

Christian Graus

17-Jul-05 18:06

Actually, I was reading that VB.NET causes a lot more context switches, which means it can be slower in some instances. This was from a book on optimising ASP.NET applications in both languages.

Christian Graus - Microsoft MVP - C++

Dave Kreskowiak18-Jul-05 2:32

18-Jul-05 2:32

I don't know about that. From what I've been reading, albeit only briefly, it can happen alot when you interlace blocks of code with HTML in ASP. I haven't found anything on that in ASP.NET, yet...

But in a Windows Forms app? VB.NET and C# would have to generate radically different code for something like that to happen. Wouldn't you think?

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Christian Graus18-Jul-05 12:54

Christian Graus

18-Jul-05 12:54

Dave Kreskowiak wrote:
VB.NET and C# would have to generate radically different code for something like that to happen. Wouldn't you think?

Yeah - this book is pretty deep, it covers every possible cause of unnecessary CPU usage, and it mentions that VB has some methods that cause it, as opposed to different methods C# has to do the same thing. I think it was to do with array lookups, but I can't recall. I didn't exactly do a dance and memorise the details Smile | :)

I can look it up if you like.

Christian Graus - Microsoft MVP - C++

Dave Kreskowiak19-Jul-05 2:53

19-Jul-05 2:53

Christian Graus wrote:
I didn't exactly do a dance and memorise the details

Christian! I'm shocked! Big Grin | :-D

You didn't do a dance when you found something bad about VB.NET?! Laugh | :laugh:

What's the book? It woud be an interesting read.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Bitblt .Net style help using (Matthew Hazlett) code

Christian Graus19-Jul-05 10:40

Christian Graus

19-Jul-05 10:40

Dave Kreskowiak wrote:
Christian! I'm shocked! You didn't do a dance when you found something bad about VB.NET?!

*grin* I recently found out that VB.NET supports optional parameters, which C# does not. I'd prefer operator overloading to optional parameters, but while I still personally hate to use VB, I was obviously wrong in thinking it is always behind C# in language features. So, I give up.

Dave Kreskowiak wrote:
What's the book? It woud be an interesting read.

Improving .NET application performance and scalability.[^] It's a great read, I've learned a lot about the framework I did not know, like WeakReferences, for example. One of the best things about becoming an MVP is that I got to choose a number of books, and I've been given more since, so I've got quite a number of the patterns and practices books now. Sadly, I'd just bought a whole lot, so some of my picks were areas of vague interest, I'd already bought the stuff I *really* wanted. But I'd say this is close to being the best of the lot, even better than Code Complete was.

Christian Graus - Microsoft MVP - C++

insert statment

Anonymous16-Jul-05 11:36

Anonymous

16-Jul-05 11:36

hellow to all ..
can anybody tell me what's wrong with this insert statment
i recive Syntax error message ...

If TextBox1.Text = "" Or TextBox2.Text = "" Or TextBox3.Text = "" Or TextBox4.Text = "" Then
MessageBox.Show("Fill in all the fields")
Else

Dim ConnString As String
ConnString = "provider=microsoft.jet.oledb.4.0;data source=C:\Message.mdb"
Dim MyOledbCommand As OleDbCommand = New OleDbCommand
Dim OleDbConn As OleDbConnection = New OleDbConnection(ConnString)
OleDbConn.Open()

Dim String1, String2, String3, String4 As String

Dim u_date As String

String1 = TextBox1.Text
String2 = TextBox2.Text
String3 = TextBox3.Text
String4 = TextBox4.Text
String5 = Date.Today

Try

MyOledbCommand.CommandText = "Insert Into User " _
& "(user_name,password,first_name,last_name,u_date) " _
& "Values (" & "'" & String1 & "', " & "'" & String2 & "', " & "'" & String3 & "', " & "'" & String4 & "', " & "'" & String5 & "')"

MessageBox.Show(MyOledbCommand.CommandText)
MyOledbCommand.Connection = OleDbConn

MyOledbCommand.ExecuteNonQuery()
OleDbConn.Close()

MessageBox.Show("User was added")
TextBox1.Clear()
TextBox2.Clear()
TextBox3.Clear()
TextBox4.Clear()
Catch err As System.Exception
MessageBox.Show(err.Message)
End Try
End If

Fraxx Daidouji16-Jul-05 6:47

Fraxx Daidouji

16-Jul-05 6:47

I used Matthew Hazlett bitblt code for vb.net and got it to work for part of what I wanted to do.

I have one picturebox which is my tileset holder. 32x32 tiles in size.
I have another picture box to hold the tile I clicked on(That part worked.)

Now I have a third picture box that is my map. I want to be able to click anywhere on picturebox3 and past the picture 32x32 in size from the second picturebox where I clicked.

The only thing I have got it to do is past it at 0,0 in the third picture box. I tired changeing numbers around and still nothing.

adding new form

Anonymous15-Jul-05 23:26

Anonymous

15-Jul-05 23:26

hellow to all
i wana add to my project a new form but i wana this form to be the first to load not the second one ...
how can i do it ?
thx to all ..

Re: adding new form

[Marc]16-Jul-05 8:52

[Marc]

16-Jul-05 8:52

You have to change the startup object of your application:
Menu >> Project >> [ProjectName] Properties >> Startup object

Re: adding new form

Anonymous16-Jul-05 11:02

Anonymous

16-Jul-05 11:02

thxx

Re: adding new form

[Marc]16-Jul-05 15:48

[Marc]

16-Jul-05 15:48

ur welkum

Folder Treeview with checkboxes (VB6)

xer131415-Jul-05 22:30

xer1314

15-Jul-05 22:30

Hi all, im a novice programmer. I was wondering how I could get a Folder Treeview with checkboxes (VB6). More specifically, I want to feed an array of directories (paths) to a treeview with checkboxes. These directories would be the highest level in the treeview (ie when collapsed, the only items or nodes would be the list from the array of directories).

The purpose of this is so that I can exclude or include (with checkboxes) subfolders for the purpose of copying files en-mass (a lot a time).

Ive seen examples of this from http://btmtz.mvps.org/treeview/ but as I am a novice programmer, I have difficulty in implementing... any help would be appreciated.

sqlce connection help

Member 190267915-Jul-05 22:00

Member 1902679

15-Jul-05 22:00

I need help i am trying to creat a program in VB.net for a pda.
i already have the database created using the quary analizer.
but i can not get the connection to work.
Public Sub conn()
Dim conn As New SqlCeConnection
conn.ConnectionString = "Provider=Microsoft.SQLSERVER.OLEDB.CE.2.0; Data Source=\My Documents\abook.sdf;"
end sub
but i keep getting exceptions
i have searched threw several examples but they all start out by creating the database or using XML.
all i want is to retrieve data and manipulate it.
please some one explane what i am doing wrong, and a good example of what i need to do.

Vb+scanned image reading

royrana15-Jul-05 22:00

royrana

15-Jul-05 22:00

I have a scanned image which has two small circles in it. One is black colored another is white , in a picture box. I want to read the specific rgb of the two circles and represent the name black and white in two labels in a form.
Pls help me

Log File Question

LordLothar15-Jul-05 20:30

LordLothar

15-Jul-05 20:30

Im a beginner in VB.net. Im was about to create a text log file to record my application activity such as the user update or delete something then such activity will be recorded in text file. I have this code from code project last time:

Private Shared Sub WriteToAppLog( _<br />
ByVal message As String _<br />
, ByVal messageType As EventLogEntryType _<br />
)<br />
Dim elLog As System.Diagnostics.EventLog<br />
Try<br />
elLog = New System.Diagnostics.EventLog( _<br />
"Application" _<br />
, Environment.MachineName _<br />
, Application.ProductName _<br />
)<br />
elLog.WriteEntry(message, messageType)<br />
Catch ex As Exception<br />
'Your error handling here<br />
End Try<br />
End Sub

But im not really understand how to implement it and where i can check the log file from above code? Does it appear to be .txt file? and does above code have to be placed in every form in my vb.net? If u have any other code than above, feel free to tell me.

Please help me, this is my last step of my project.
Thanks.

code net send

Member 199098515-Jul-05 15:56

Member 1990985

15-Jul-05 15:56

hello world,,,

can any one help me plis.. with this...

1- how can send messages anom.,. the code pls,,, i try with other programs,, y want the code,,, simple as that

2- how capture the incoming message,,, in a label or a text box,,,,

thanks a lot Cry | :((

jam

Windows Authentication IIS

Harmonium15-Jul-05 9:12

Harmonium

15-Jul-05 9:12

Goal: I need to use Windows Groups to determine access to certain
controls on an intranet web app.

Specs:
1. I can only use Windows Authentication.
2. IIS6.

What I have done so far:
1. I have an application already in use that uses Windows
Authentication.
2. I added two new groups each with users to my local machine.
3. I added this code in the web.Config:
<identity impersonate="true">
<authentication mode="Windows">
<authorization>
<allow roles="WORK\Administrators">
<allow roles="LOCAL\Administrators">
<allow roles="LOCAL\Basic">
<allow roles="LOCAL\Master">
<deny users="*">

4. I have this code in the code-behind of my start page:
Dim authUserName As String
authUserName = User.Identity.Name.ToUpper.Trim
Session("Username") = authUserName
If Principal.WindowsIdentity.GetCurrent.IsAuthenticated
Then
Server.Transfer("main.aspx")
End If

Questions:
1. How can I determine the Group name of the user when they log in?
2. How can I set up my local machine to test my program?

Waiting on process to finish

phraser15-Jul-05 9:11

phraser

15-Jul-05 9:11

Hello i am currently executeing a program though VB . Net with the following code

Dim startInfo As System.Diagnostics.ProcessStartInfo
Dim pStart As New System.Diagnostics.Process

startInfo = New System.Diagnostics.ProcessStartInfo("c:\file.exe")
startInfo.CreateNoWindow = True
startInfo.WindowStyle = ProcessWindowStyle.Minimized

pStart.StartInfo = startInfo
pStart.Start()
pStart.WaitForExit()

Is there a way i can make it halt the script untill the process has finished installing etc then it carrys on.

Also is it possible to create progress bars for files i am executing with the following code above?

Thanks
Oliver

Dave Kreskowiak15-Jul-05 9:30

15-Jul-05 9:30

phraser wrote:
Is there a way i can make it halt the script untill the process has finished installing etc then it carrys on.

You're already doing it.

pStart.Start().WaitForExit()

If your code doesn't block and wait for the process to exit, it means that the process you started already has exited. I take it you're launching some kind of shell .EXE and it is doing a Windows Installer installation (MSI file)? This will cause you great difficulty because the process you launch quits before the MSI is done installing. Since you can only have one MSI install going at a time, you can write a function to mointor a Process list for "msiexec". When all of the "msiexec" processes have finished, you can be reasonably sure that the installation is complete.

phraser wrote:
Also is it possible to create progress bars for files i am executing with the following code above?

No. Since the processes you're launching don't report back any kind of progress, you can't make a 0% to 100% ProgressBar. You can, however, make a non-progress ProgressBar. Confused? This is simply a bar that scrolls endlessly, indicating something is going on. Like the White/Blue/Black bar on the Windows 2000 title screen that scrolls acrossed the windth of the screen when 2000 boots. XP has a little green box scroller during installation and another scroller when it boots on its title screen.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

phraser15-Jul-05 9:34

phraser

15-Jul-05 9:34

Ah sorry i am still learning vb abit Smile | :)

Anyway when the .exe file is executed from the vb program, it likes to hang abit till it is closed.

Is there a way around this

And about the progress bar thats what im after an exact copy of like XP's boot one, any ideas how to make one?

Thanks
Oli

rwestgraham15-Jul-05 10:45

rwestgraham

15-Jul-05 10:45

What do you mean "hang a bit till it is closed"? Does it do this only when launched from VB or does it always do this? If it always does it, the exe is running some kind of final termination code. Running it from VB should make no difference...

As far as doing a progress bar that loops a period or whatever, you will have to do it on a different thread because the thread that launches the exe will be blocked until the the Wait function becomes signalled.

Exactly how you go about this just depends on your application design. You could create a new thread for the "progress" loop. But if your application already showing some kind of UI, then you should run the loop there and create the new thread to run the EXE instead.

Either way, you will have to have two threads, no way around it.

Robert

Dave Kreskowiak15-Jul-05 11:24

15-Jul-05 11:24

phraser wrote:
And about the progress bar thats what im after an exact copy of like XP's boot one, any ideas how to make one?

Lucky for you -> Building a Progress Bar that Doesn't Progress[^] on MSDN.

phraser wrote:
Anyway when the .exe file is executed from the vb program, it likes to hang abit till it is closed.

I have no idea what you mean by this and what the problem is with it.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome