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Hi,
Does anyone have any examples in VB/VB.NET on how to either merge 2 wav files togetger or to play them consec utively in code ?
Thanks
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If the files have the same sample rate, sample size (bits, sign) and mono/stereo setting, you can just extract the data from the files, merge and save with a new header.
---
single minded; short sighted; long gone;
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"just" might be pushing it a bit as there are a number of possible encodings, some of which requires knowledge of the encoding to combine.
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Open that files in binary mode and just add the beginning of the second to the end of the first.
But also you will have to change the header info. Just the file Size part.
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I need to copy all files from one file to another..Could someon help
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check
System.IO.Directory.GetFiles()
System.IO.File.Copy()
When you get mad...THINK twice that the only advice
Tamimi - Code
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If you're using VB.NET 2005, you can use that handly little "My":
<br />
For Each sfile As String In My.Computer.FileSystem.GetFiles( My.Computer.FileSystem.SpecialDirectories.MyDocuments,FileIO.SearchOption.SearchAllSubDirectories,"*.*")<br />
<br />
My.Computer.FileSystem.CopyFile(sFile, "C:\Lalala")<br />
Next<br />
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Could you please explain wat is going on
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sure
to find all the files in a folder, and do something with each file (like copy them) i used the "For Each" statement.
For Each sfile As String In My.Computer.FileSystem.GetFiles( ..
so sfile is a string with all the filenames located in the specified folder (in my case, My Documents)
<br />
My.Computer.FileSystem.GetFiles(My.Computer.FileSystem.SpecialDirectories.MyDocuments, FileIO.SearchOption.SearchAllSubDirectories, "*.*")
or could be anything, like
My.Computer.FileSystem.GetFiles("C:\Tatata")
then each file was given the command to be copied to "C:\Lalala"
My.Computer.FileSystem.CopyFile(sFile, "C:\Lalala")
and then ends the loop:
Next
i hope that helps.
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Thanks a lot....That was my requirement i will try it outt
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This Function can do for u !!!! 
Imports System.IO
Public Sub CopyDir(ByVal strSrc As String, ByVal strDest As String)
Dim dirInfo As New DirectoryInfo(strSrc)
Dim fsInfo As FileSystemInfo
If Not Directory.Exists(strDest) Then
Directory.CreateDirectory(strDest)
End If
For Each fsInfo In dirInfo.GetFileSystemInfos
Dim strDestFileName As String = Path.Combine(strDest, fsInfo.Name)
If TypeOf fsInfo Is FileInfo Then
File.Copy(fsInfo.FullName, strDestFileName, True)
'This will overwrite files that already exist
Else
CopyDir(fsInfo.FullName, strDestFileName)
End If
Next
End Sub
While Copying , if the source dir content large file your GUI will be hanged,,,, so u can use Background worker along with that methods
Happy Programming
-----
Abhijit
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This works perfectly fine...Thanks a lot
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i need to download Attachment from Email in Outlook using VB,NET. Could someone help
-- modified at 9:14 Monday 15th October, 2007
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Hi all,
I have 2 forms (Form1 and Form2) in my app. Form1 has 2 buttons (Button1 and Button2). The Load event of Form2 has this code:
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load<br />
Dim obj(,,) As Object<br />
ReDim obj(50, 24000, 100)<br />
End Sub<br />
When you click Button1 on Form1 this code is executed:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click<br />
Dim obj(,,) As Object<br />
ReDim obj(50, 25000, 100)<br />
End Sub<br />
The ReDim statement gives an OutOfMemoryException. When I change the statement to
ReDim obj(50, 24000, 100)
the exception isn't thrown anymore.
When Button2 is clicked, this code is executed:
Private Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click<br />
For tel As Integer = 1 To 10<br />
Dim f As New Form2<br />
f.Show()<br />
Next<br />
End Sub<br />
This works just fine.
After searching the web for answers, I think it may have to do with the heap size, but I'm not sure at all.
My questions:
Why is the Button1 code giving an exception and why is this not happening when clicking Button2?
What should I do to make the Button1 code work without throwing an exception?
Skippy II
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I've got a better question. Why are you creating such MASSIVE arrays of objects?? 120,000,000+??
Just creating that many Objects, that don't do anything, in a single one of your arrays takes over a 1GB of RAM?? And you're creating at least 10 of these?? What on earth for??
BTW: I can't tell how much memory your code will use, because it ran my machine out of RAM. But I can make an educated guess that it's probably going to be around a 40 gigabytes if all of those arrays are filled with objects.
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Thanks for your reaction.
I know it doesn't make much sense to create such big arrays. At least not 10 of them. But I would like to use the idea in a grid control. The array would contain columnnumbers, rownumbers and cell properties.
Now the code provided is just an example and is not the whole project of course. It is only a simple way to explain the problem.
In fact, what I wanted to show, is that when allocating memory for 125,000,000 objects an error is thrown. But when allocating memory for 10 times 120,000,000 objects, no error is thrown at all.
I hope your "better" question is answered.
Any idea about my questions?
Skippy II
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Skippy II wrote: In fact, what I wanted to show, is that when allocating memory for 125,000,000 objects an error is thrown. But when allocating memory for 10 times 120,000,000 objects, no error is thrown at all.
All you did was declare an array that MIGHT hold that many objects. In this case, it'll allocate pointers to Nothing, which, on a 32-bit machine, is a 4 byte value containing all 0's. So, 120,000,000 * 4 = 480,000,000 bytes will be allocated to hold 120,000,000 address that point to nowhere.
So, when you allocate one of those empty arrays, you're actually reserving 480MB of memory to hold pointers to nowhere, and when you create 10 of them, 4.8GB of RAM. Since the standard user mode address space can only handle 2GB per process and 2GB for the kernel space, BOOM - OutOfMemory. You can change the boot config of Windows so the split is 3GB for user space and 1GB for kernel, but you still won't get enough to do what you want.
AND you still haven't created the objects that these arrays will point to!
Try it:
Dim arr(50,25000,100) As Object
For a As Integer = 0 to 49
For b As Integer = 0 to 24999
For c As Integer = 0 to 99
arr(a, b, c) = New Object()
Next
Next
Next
You'll reach 1GB of RAM before you get half way through the outside loop.
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I cannot deny what you write. You're absolutely right. The idea may not be the best. But you still do not answer the questions.
Why is an error thrown when declaring an array that might hold 125,000,000 objects, but not when declaring 10 times an array of 120,000,000 items?
Skippy II
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Hi,
the array you allocate in Form2_Load() is no longer alive when Form2_Load terminates,
hence the garbage collector can reclaim it when it feels a need, such as when your next
form instance runs its Form2_Load().
Therefore your app probably never holds more than one of those huge arrays.
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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Thanks for replying, Luc. That is indeed very true. I completely overlooked this .
Do you know if there is a way to increase the available memory allocation?
Skippy II
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Hi,
Skippy II wrote: a way to increase the available memory allocation?
Don't know, I never needed anything above normal size; to me a multi-
dimensional array, or a very big one/two-dimensional array, indicate a wrong
aproach; if it takes that much memory, how long will it take to initialize, compute,
and draw conclusions from it?
Maybe this could help.[^]
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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I understand your reaction. Perhaps it is indeed a wrong approach.
But the problem is much bigger than the provided code. Actually the whole project is about creating a very fast virtual grid (a bit comparable to a virtual listview, but even a lot faster). Accessing an object array (with property values at a specific location) is way faster than accessing the regular properties. The first coding steps led to a very fast, but extremely complex way of programming (a combination of virtual and real cells in the grid). One solution is to extend the object array so every cell can be virtual. But then this OutOfMemoryException came up...
Anyway, thanks for your contribution.
Skippy II
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You can only get your hands on a total of 3GB of memory, IF you put the /3GB[^] switch in the boot.ini for Windows. There is no way to get any more, and even this technique is NOT recommened.
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Given code is not workng properly tell me in depth how to run
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