Finding the End Of File - Visual Basic Discussion Boards

Re: DxSolo

DxSolo3-Jul-03 6:53

DxSolo

3-Jul-03 6:53

nevermind i got it

File Download - web service

jrmcdona2-Jul-03 7:22

jrmcdona

2-Jul-03 7:22

I am trying to build a web service that downloads a file to my local directory.

I have the basics here but I just cannot get it to work, anybody know of any examples on this. Here is my code so far.

<br />
Dim l_oWR As WebRequest<br />
        Dim l_oWebResp As WebResponse<br />
        Dim l_oBR As BinaryReader<br />
        Dim l_oBW As BinaryWriter<br />
        Dim l_oStream As Stream<br />
        Dim bFile() As Byte<br />
        Dim l_iCnt As Long<br />
        Dim l_dtNow As DateTime = DateTime.Now<br />
        Dim l_sDir As String = l_dtNow.ToString("MMddyyyy")<br />
        Dim l_oDir As Directory<br />
        Dim l_sFile As String<br />
        Dim l_sCnnStr As String<br />
<br />
        Try<br />
<br />
            'download file<br />
            l_oWR = HttpWebRequest.Create("http://www.abc.com/abc.exe")<br />
            l_oWebResp = l_oWR.GetResponse()<br />
            l_oBR = New BinaryReader(l_oWebResp.GetResponseStream(), Encoding.ASCII)<br />
            l_iCnt = l_oWebResp.ContentLength<br />
            bFile = l_oBR.ReadBytes(CType(l_iCnt, Integer))<br />
            If Not System.IO.Directory.Exists("C:\ofac") Then<br />
                System.IO.Directory.CreateDirectory("C:\ofac")<br />
            End If<br />
            l_oStream = New FileStream("C:\ofac\t11sdall.exe", FileMode.Create, FileAccess.Write)<br />
            l_oBW = New BinaryWriter(l_oStream)<br />
            l_oBW.Write(bFile)<br />

Thanks for any help here!
Jordan

how solving the error cordbg.exe

gary6662-Jul-03 6:59

gary666

2-Jul-03 6:59

i have a problem in the moment execut my program after installing my setup, say Registered JIT Debugger is not Available,Cordbg,exe, i use crystal report in my porgram, when I don't use, works well, any personsa that I can help.

Tanks

DataGridEx

Bernhard Hofmann2-Jul-03 2:59

Bernhard Hofmann

2-Jul-03 2:59

Hi
Anyone used the DataGridEx control (Article here)? I've formatted a column with a style, and the print facility ignores the style.

Any advice? Thanks
Bernhard

Don't worry, nobody lives forever.

String to Integer?

oliver_twistor1-Jul-03 8:09

oliver_twistor

1-Jul-03 8:09

In my program I want the user to write in a TextBox. Then I want to check if the input contains only a numerical value. How can I do this?

//OT

Re: String to Integer?

apferreira1-Jul-03 8:16

apferreira

1-Jul-03 8:16

If you want to convert a string to an int use Int32.Parse(mystring). If you want to validate input (requiring numeric values only, for instance) use regular expressions.

Re: String to Integer?

Matt Casto1-Jul-03 8:16

Matt Casto

1-Jul-03 8:16

Just something like this will work:

If IsNumeric(Textbox1.Text) Then<br />
  ' Value entered is a number<br />
End If

Finding the End Of File

DxSolo1-Jul-03 7:45

DxSolo

1-Jul-03 7:45

hey i have a project where i need to read from a text file but i will never know how long it is. It is basically a list of numbers. I read them in and store them in a collection but how do i know when the end of file is? this is in VB.Net

Re: Finding the End Of File

dynamic2-Jul-03 8:33

dynamic

2-Jul-03 8:33

this should help , make sure to put your text file's location where it currently says C:\mytest.txt .
VbCode:

<font color="blue">Imports</font> System.IO <br> <font color="DarkGreen">'/// at the top of your form's code window ^^^^. <br></font> <font color="DarkGreen">'///////////////////////////////////////////// <br></font> <font color="blue">Private</font> <font color="blue">Sub</font> Button3_Click(<font color="blue">ByVal</font> sender <font color="blue">As</font> System.Object, <font color="blue">ByVal</font> e <font color="blue">As</font> System.EventArgs) <font color="blue">Handles</font> Button3.Click <br>     <font color="blue">Dim</font> sReader <font color="blue">As</font> StreamReader = <font color="blue">New</font> StreamReader(<font color="blue">New</font> FileStream("C:\mytest.txt", FileMode.Open, FileAccess.Read)) <br>     <font color="blue">Dim</font> x <font color="blue">As</font> <font color="blue">Integer</font> = sReader.BaseStream.Length <br>     MessageBox.Show("The Length of the text file is: " & x & " Characters") <br>     While Not sReader.Peek <br>         Console.WriteLine(sReader.ReadLine) <br>     <font color="blue">End</font> While <br>     sReader.Close() <br> <font color="blue">End</font> <font color="blue">Sub</font> <br>

hope that helps Smile | :)

Vb:

<font color="blue">Public Function</font> TwinsOnWay(<font color="blue">ByVal</font> twins <font color="blue">As String</font>) <font color="blue">As String <br>     Select Case</font> twins<br>         <font color="blue">Case</font> "Gender" <br>             <font color="blue">Return</font> "Two Girls" <br>     <font color="blue">End Select <br> End Function</font> <br>

?? displaying data

shirleyLo1-Jul-03 3:10

shirleyLo

1-Jul-03 3:10

How do you "auto-scale" data points on a graph?
the data will be received at a constant frequency.

I will be receiving data from a CAN/bluetooth gateway on a vehicle.

How do I go about graphing and receiving those data points and putting them on both a line and bar graph?

Thanks.

Obtaining Focus in VB application

Simes1-Jul-03 1:12

Simes

1-Jul-03 1:12

Hi,

I hope someone out there may be able to help. I have a WebBrowser control written in VB 6.0 that acts a Internet viewer but with most of the normal Internet functionality removed so people can not play around with the system. This is opened by clicking on an icon that appears on a Windows shell. This has been written again to stop people moving around the Windows NT 4.0 system. when the user clicks on the viewer it opens up and displays the home page, which then asks for a login (through IIS). Once logged in an ASP page starts up and tries to get the focus, but unfortunately it is still with the underlying viewer. Is there any way to set the focus to the ASP page. The two applications are separate.
Also in VB 6.0 is there a way to get the username that is entered when IIS displays the login box. In ASP you can use ServerVariables("LOGIN_NAME"), but I don't seem to get anything back when I set this up in my code.

large Memory used in .NET application

maxfava30-Jun-03 23:17

maxfava

30-Jun-03 23:17

Hi,
try this with Windows XP or Window 2000:
1) create new windows application project.
2) Start debug.
3) press ctrl + Alt + Delete
4) Task manager
5) view the memory used by you application, it is 11 Mb.

And if you add a simple dbconnection with dataadatper the memory used is ~24Mb.
Is there a way to reduce the memory used by the application?
In my application with simple 5 form it use 75 Mb of memory.

It is too much. Frown | :(

confused:

Max

Re: large Memory used in .NET application

Ian Darling1-Jul-03 6:43

Ian Darling

1-Jul-03 6:43

The task manager shows your working set, which isn't the same as the memory load of your process. The .NET Framework is included in that lot, as well as anything else which happens to be shared. Try pview for more accurate stats.

--
Ian Darling

Re: large Memory used in .NET application

apferreira1-Jul-03 7:07

apferreira

1-Jul-03 7:07

Contrary to popular belief, automaticall memory management in .Net is not equivalent to 100% total resource clean up. Coders still have the responsability of freeing some resources through the Dispose() method.
Use dispose whenever available if you want to reduce memory footprint and avoid thoses cases where Net programs' memory usage continuously grows over time. (A five form program should never reach 75 Mb (unless it deals with very large quantities of data like uncompressed 20MB+ images) if coding practices are good.

Also, try minimizing the form in your example and see how much memory it is using (much less). This happens because at startup your program is assigned a large working set to account for any initialization the CLR and associated dlls might need.

i want this function

elmahdy30-Jun-03 15:24

elmahdy

30-Jun-03 15:24

i made an audio program
But i need a function that tells me if the current audio contains music ..
that to provide my application more features
Really i need ur help

thanks alot

ahmed elmahdy

Re: i want this function

Ian Darling1-Jul-03 6:39

Ian Darling

1-Jul-03 6:39

elmahdy wrote:
But i need a function that tells me if the current audio contains music

What sort of audio are you using? mp3, wav, wma?
Then is there any meta-data associated with that format to indicate if it's music or something else (eg, audiobook or sample)

AFAIK there's no simple way to tell if something is music or not (I'm guessing some sort of analysis to detect repeating beats?) - and writing software that does this requires musical expertise and usually costs $£€

--
Ian Darling

Re: i want this function

elmahdy1-Jul-03 13:28

elmahdy

1-Jul-03 13:28

i use wav sort
i want to display a sweety things when my program find music ... i will deal with sound ports ??
what is the best method ?
thanks alot

ahmed elmahdy

Re: i want this function

Ian Darling2-Jul-03 22:28

Ian Darling

2-Jul-03 22:28

elmahdy wrote:
what is the best method ?

I don't know. The scope of your question is outside what this forum is aimed at, and I'm not a music expert. Try searching on google?

--
Ian Darling

Multiple Textboxes in same array

mpalmati30-Jun-03 12:57

mpalmati

30-Jun-03 12:57

How can I get txtbox1.Text and txtbox2.Text data into the same array, without hand-coding the values into a separate arra Mad | :mad:

y???

Re: Multiple Textboxes in same array

Ian Darling1-Jul-03 4:56

Ian Darling

1-Jul-03 4:56

(VB.NET) Try a Datagrid and using data binding on the array instead if you have a lot of textboxes?

(VB6) Use a control array, and then you can use a loop to copy across to the array.

YMMV

--
Ian Darling

Re: Multiple Textboxes in same array

mpalmati1-Jul-03 6:19

mpalmati

1-Jul-03 6:19

I have 12 textboxes that I need as one array,12 others as a separate array.
I think the datagrid might work, but I've never used that control. Can you point me to an article (beginner level).
Thanks for your help! Smile | :)

Re: Multiple Textboxes in same array

Ian Darling1-Jul-03 6:34

Ian Darling

1-Jul-03 6:34

Well, there's probably an article on CP somewhere, but it's really simple - bung a datagrid on your form, then call SetDataBinding on it with your array:

' Example - display an array of 3 items in a datagrid
Dim myArray as String(3) = { "Hi", "Hello", "Bonjour" }
' Haven't tested this, but should work ok
DataGrid1.SetDataBinding(myArray, "")

If you need something more complicated (eg, multiple columns), use a DataTable instead of an Array. All of this is documented in MSDN anyway.

--
Ian Darling

How do I convert to and from UNIX standard epoch date numbers?

Olle Jonsson30-Jun-03 2:48

Olle Jonsson

30-Jun-03 2:48

This is my first time here, so: hi guys! Hope your day does not suck. Mine is OK, but I'm banging my fragile head against a problem with converting UNIX standard epoch numbers to something fairly regular, date-wise.

I receive a timecode from a Perl program, written as seconds since 1970, the standard way of talking about time in the UNIX world. Then my VB component wants to log this thing, and well, I'd like to be able to record it like YYYY-MM-DD HH:MM, but so far I am stumped.

Some gotchas (add to this list if you can come up with more difficulties that could crop up during the writing of such a function):

* leap years

A few examples of timecodes from the last few weeks:
1054746806
1054555725
1056715898

OK, that is my question. Have you done this before?

Have a nice day, folks.

Olle
Lund, Sweden

Re: How do I convert to and from UNIX standard epoch date numbers?

Olle Jonsson30-Jun-03 5:13

Olle Jonsson

30-Jun-03 5:13

After doing a nice function to calculate how many seconds have elapsed since 1970-01-01 00:00:00 a workmate came by and whistled that I should do a DateDiff()

<br />
DateDiff("s", CDate("1970-01-01 00:00:00"), Now)<br />

Which was correct. Sigh. I'll try and make the other conversion, now. From seconds into days and years and months and...

See you.
Olle,
Shamed in a corner, Lund, Sweden

Re: How do I convert to and from UNIX standard epoch date numbers?

Matt Casto30-Jun-03 5:13

Matt Casto

30-Jun-03 5:13

I believe this will work, but I didn't actually test it against any known Epoch date values.

Private Function GetEpochDate(ByVal seconds As Long) As DateTime<br />
  Dim BeginningOfTime As New DateTime(1970, 1, 1)<br />
  Return BeginningOfTime.AddSeconds(seconds)<br />
End Function

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