Visual Basic

Re: Visual Basic .net digital signature

22-Oct-10 13:28

So long as you use an appropriate signing certificate, there's no difference.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

crain198122-Oct-10 14:22

crain1981

22-Oct-10 14:22

thanks dave

Visual Basic Encryption

crain198122-Oct-10 3:15

crain1981

22-Oct-10 3:15

Using the .net 2.0 framework.

When encrypting files with vb, it will take vb to decrypt the files as well right? I trying to see if the windows OS will be able to open the file since I'm using MS products.

Re: Visual Basic Encryption

Gregory Gadow22-Oct-10 3:54

Gregory Gadow

22-Oct-10 3:54

The .Net Framework is the .Net Framework: the actual language used is irrelevant. There would be no problem having your encryption program written in VB and your decryption program in C#. For that matter, your decryption program can be in C++, Fortran, Delphi, COBOL or assembly, it really does not matter.

Re: Visual Basic Encryption

Herboren23-Oct-10 18:48

Herboren

23-Oct-10 18:48

Yeah I just read a chapter about encryption, vb uses the XOR or exclusive OR, when encrypting the file, I noticed one of its example, it will convert a character to its ascii standard and add one 1 to the standard, do the opposite with the ascii coversion, by deducting one from the the standard and convert back to its normal form, yes any windows OS will read it correctly.

Send Commands Directly to a Printer

εїзεїзεїз20-Oct-10 23:12

εїзεїзεїз

20-Oct-10 23:12

Thanks in advance

How can we send these commands directly to a POS printer in vb.net

Chr(27) + Chr(112) + Chr(0) + Chr(48) + Chr(63)

SOFTDEV

Luck in life always exists in the form of an abstract class that cannot be instantiated directly and needs to be inherited by hard work and dedication.

Goutam Patra21-Oct-10 0:31

Goutam Patra

21-Oct-10 0:31

Using RAW[^] printing

εїзεїзεїз22-Oct-10 19:25

εїзεїзεїз

22-Oct-10 19:25

Does not work

SOFTDEV

Luck in life always exists in the form of an abstract class that cannot be instantiated directly and needs to be inherited by hard work and dedication.

Rajesh Anuhya21-Oct-10 20:03

Rajesh Anuhya

21-Oct-10 20:03

First tell me how the POS printer is connected to your PC???,
is this Driver based???,

for Send custom command to your POS Printer you have to use the printer API's

Rajesh B --> A Poor Workman Blames His Tools <--

εїзεїзεїз22-Oct-10 19:23

εїзεїзεїз

22-Oct-10 19:23

Its Connected through COM port using COM2 port and the vendor gave a driver when i use that driver it prints so slow , so i have to use Generic Driver to Cut the Paper and Open Cash drawer which is also connected to the Printer.

SOFTDEV

Luck in life always exists in the form of an abstract class that cannot be instantiated directly and needs to be inherited by hard work and dedication.

Dave Kreskowiak23-Oct-10 3:53

23-Oct-10 3:53

Start lookin at these:

how to send raw data to a printer by using visual basic .net[^]

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Código para validar cpf no Access xp

Rajesh Anuhya24-Oct-10 21:41

Rajesh Anuhya

24-Oct-10 21:41

If it's connected to the Comport, U need not to use Generic drivers, Using SerialPort class you can send your commands, just you have to know the comport settings of your POS.

Print the receipts using the POS driver, Close the Comport(Opened by Driver), Open the comport again using Your Program, send the commands what ever you want.,

Rajesh B --> A Poor Workman Blames His Tools <--

Raphael4920-Oct-10 20:15

Raphael49

20-Oct-10 20:15

Olá Professores;
Alguém de vocês tem o código de validação do cpf

Atenciosamente
Daniel Raphael

Re: Código para validar cpf no Access xp - translated

Peter_in_278020-Oct-10 20:22

Peter_in_2780

20-Oct-10 20:22

Google translate says:

Hello Teachers;
Anyone of you have the validation code cpf

Graciously
Daniel Raphael

Software rusts. Simon Stephenson, ca 1994.

Re: Código para validar cpf no Access xp - translated

DaveAuld20-Oct-10 21:37

DaveAuld

20-Oct-10 21:37

Nope........still no clearer!

Dave
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Re: Código para validar cpf no Access xp

Andy_L_J20-Oct-10 21:55

Andy_L_J

20-Oct-10 21:55

Que?

I don't speak Idiot - please talk slowly and clearly

'This space for rent'

Driven to the arms of Heineken by the wife

Re: Código para validar cpf no Access xp

Dave Kreskowiak21-Oct-10 2:07

Key Tracking Using API not working

21-Oct-10 2:07

After running that through Google Translate, your question doesn't make sense.

If you're looking for code to validate soemthing, you're going to have to be a lot more specific (in English) about what you're trying to validate and under what conditions. There is no generic validation code that works with everything in all situations.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

greendragons20-Oct-10 7:49

greendragons

20-Oct-10 7:49

I made a lil' application that tracks wht key has been pressed...
I have called api function... but it's not tracking keys like A or a , R...
It's working for Enter, backspace pretty well.....
Why it is not working for alphabets.....

<br />
    Declare Function GetAsyncKeyState Lib "user32" Alias "GetAsyncKeyState" (ByVal vKey As Keys) As Integer<br />
<br />
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load<br />
<br />
<br />
    End Sub<br />
<br />
    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick<br />
        <br />
        If GetAsyncKeyState(Keys.A) > 0 Then<br />
<br />
            MsgBox("A")<br />
<br />
        Else<br />
        End If<br />
       <br />
<br />
    End Sub<br />
End Class

DaveAuld20-Oct-10 8:41

DaveAuld

20-Oct-10 8:41

I don't think that is the way to track the keys being pressed (with a timer?)

Should you not be hooking into the keyboard message loop?

Look at the Docs for it;

GetAsyncKeyState Function
Determines whether a key is up or down at the time the function is called, and whether the key was pressed after a previous call to GetAsyncKeyState.

Your Timer Tick is more than likely missing the keyboard event.

Dave
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greendragons20-Oct-10 8:58

greendragons

20-Oct-10 8:58

I have put msg box jes to chk if it's working or not....
Ma question is that y this code not working for keys A B C...
It's only working for few keys like enter, Ctrl, Escape.....

Dave Kreskowiak20-Oct-10 9:53

20-Oct-10 9:53

It doesn't work because the key goes through make/break before your Timer fires. Your timer has to fire between the key make and key break message, which will happen VERY quickly.

Seriously, this is a very bad way of see which keys were hit.

A better method would be a keyboard hook.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Metafile Dimension Problems.

greendragons20-Oct-10 10:10

greendragons

20-Oct-10 10:10

Yeah i kno Timer concept is not rite.....but ma focus was on keys 'A','B'....y it's not working for them..
rather works totally fine for enter....

Here some changes i made

<br />
Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress<br />
<br />
        If GetAsyncKeyState(Keys.Enter) > 0 Then<br />
<br />
            MsgBox("Enter")<br />
<br />
        Else<br />
        End If<br />
<br />
    End Sub

Even this is not working although it's done on Key press event....

markW34518-Oct-10 22:52

markW345

18-Oct-10 22:52

Hi In the code below It will create a metafile in c:\test\myfile.emf
It should be a image size of 5cm * 5cm
With a vertical line inside of 2cm.

No problem, if I view this in MS word
But in ms paint its all wrong and way to large.

So if I change the line
Dim gr As Graphics = ps.CreateMeasurementGraphics()

to
Dim gr As Graphics = Me.CreateGraphics()

This time paint is OK and MS Word 2000 is ok,
But MS word 2007 reports the line as 2.69 cm.
So does Adobe Illustrator

If I create the same metafile in Adobe Illustrator its perfect for all programs, so it must be possible in VB I hope

Any thoughts

Thanks

Mark

Dim mf As Metafile
        Dim ps As New PrinterSettings()


        'Dim gr As Graphics = ps.CreateMeasurementGraphics()
        Dim gr As Graphics = Me.CreateGraphics()



        gr.PageUnit = System.Drawing.Imaging.MetafileFrameUnit.Millimeter
        gr.PageScale = 1

        Dim me_hdc As IntPtr = gr.GetHdc

        mf = New Metafile("c:\test\myfile.emf", me_hdc, New Rectangle(0, 0, 50.0F, 50.0F), MetafileFrameUnit.Millimeter, EmfType.EmfOnly)

        gr.ReleaseHdc(me_hdc)
        gr.Dispose()

        g = Graphics.FromImage(mf)
        g.PageUnit = System.Drawing.Imaging.MetafileFrameUnit.Millimeter

        g.PageScale = 1

        g.FillRectangle(Brushes.Black, 0.0F, 0.0F, 1.0F, 20.0F)

        g.Dispose()

Free Pc Status?

jahan00716-Oct-10 12:33

jahan007

16-Oct-10 12:33

I am working on this program in VB Studio 2010. It detects the computers on the network and checks if they are being used or free. I can check their presence on the network by using :

Dim pingsender As New Ping
Dim HostName As String

'For x = 1 To 3
For i = 0 To 9
HostName = "CN0809B2-DW061" + i.ToString '+ x.ToString
If pingsender.Send(HostName).Status = IPStatus.Success Then
txtPingResult.Text += String.Format("Reply from: " & HostName & vbCrLf)

Else
txtPingResult.Text += String.Format("No Reply From: " & HostName & vbCrLf)

End If

Me.Refresh()

'Pause for 1 second before pinging again
System.Threading.Thread.Sleep(1000)

'Next
Next
txtPingResult.Text = ""

Any help to go further and check if computer is logged on ? can get user name by using :

Dim name As String = Environment.UserDomainName & " \ " & Environment.UserName

Will i need client/server program or can i do this by some other method ?any advices more then welcome...Thanks <pre></pre>

Re: Free Pc Status?

Dave Kreskowiak16-Oct-10 16:05