This code works to output a piano tone for 2 seconds using winmm.dll via platform invocation services, it seems to work fine on XP but waveoutopen fails in windows 7 rc updated based on feedback from John Knoeller
[Code]...
When a delegate method throws an unhandled exception, that exception is usually trapped at the level of invocation (eg. Delegate.Invoke()) - you get a System.Reflection.TargetInvocationException...
However, when debugging classes utilizing a lot of threading/invoation, it would be helpful to be able trap the exception in the target method i.e. the faulty code, and since Microsofts BackgroundWorker (exceptions thrown in DoWork()) is able to do it, why can't I???
Is it possible to view every process that is accessing memory as well as windows services as well as how much thier accessing I want to make a program that can kill and block things accessing memory to block malicious programs to be able to delete the ie spyware that can't be fixed cause it adds it's self and locks it's self. From programs like spybot I can view the processes bit that's just wat windows registeres I need to look at eat is accessing memory.
View 6 RepliesCan someone direct me to a waveout example? All I keep finding in searchers is C# language.Just trying to play a .wav file.
View 13 RepliesIm using VS2005 and im making a project in vb.net,I was trying to add winmm.dll file but i got this error.
"A reference to 'C:Documents and Settings
hyatcoMy Documentswinmm.dll' could not be added. This is not a valid assembly or COM component. Only assemlies with extension 'dll' and COM components can be refenced. Please make sure that the file is accessible, and that it is a valid assembly or COM component."Ive already downloaded 2 winmm.dll but it doesnt really work.
I want to build a kind of a tone generator to tune my Ukulele (NERD allert, sorry for that).I know there are enough tone generators available but since a Ukulele has only 4 strings and not in the same order and tone as a regular guitar, they won't help me. My objective; to build a small VB.NET form with four buttons and every button will generate a specific tone.I've already tried Console.Beep etc [URL] but all I hear; no beep.As seen on the page at this link: QuoteThe Beep method is not supported on the 64-bit editions of Windows Vista and Windows XP.As far as I know, I'm not running a 64-bit Windows Vista, however, I'm running on a 64-bit processor.
I've tried Google (one of my best friends, but we seem te be in a separation?) but all I can find are examples in C# (since it is about music, C# is a regular tone, however I don't know anything about C# as a programmers language...) and the examples there are in VB.NET are about extreme big applications like digital piano's etc.
I'm using winmm.dll to playing sounds using c#. Some of mp3/wma/wav files are throwing error code : 277 & 275. How to handle this problem?. Is there anyway to play these type files using winmm.dll's mciSendString() function?
View 2 Repliesshow code for creating several tones to play in my computer speaker that have different frequencies for the tones and have different time lengths the tones play for!
View 11 RepliesI wanna ask about Z position on joystick fung
Code:
Imports System.Runtime.InteropServices
Imports System.ComponentModel
Public Class Joystick
[Code]....
this code is work for X and Y axis but i dont know how to use Z axis using this code,also how to called the button if it pressed or not?
I'm having problem with a program that generates a random melody.
Label5.Text = (Int(Rnd() * 6)) Generate the first tone.
If Label5.Text = 0 Then
Label1.Text = "A"[code].....
But fore some reason, when the program has played the first tone, it won't play the rest. Why?
I have written a console app in <acronym title="Visual Basic">vb</acronym> .net 2003 to capture audio data (albeit not for an audio application) using the WinMM API. This works well in XP and also on my own Vista PC. However when others try to use in on Vista or Win7 it stops working after about 10 - 30 seconds (so it manages to initiate recording from the default input device but eventually stops). The only error given is "Program has stopped working". I am wondering if this is related to the way I recycle the input buffers?
View 13 Repliesi am trying to make a virtual piano.in that i am also playing music files which is recorded through the above said piano.but how can i understand when this music playback ends.i need to invoke another function when the plyback ends.so how can i understand when the playback end.
View 1 Replies[Code].......
I have problem to play the piano swf inside the TabControl1 (WebBrowserA), but i can play piano swf within the main form (WebBrowserB). Anyone know why, and the method to solve it to play at tabcontrol1
I made a musical software. Its only to my personal use. And I have a digital piano (model: Cassio Privia PX-800), with USB conection. I need to know how my software can detect my digital piano and how to detect what key note was pressed. I tried this sample code: [URL](at the end of the page there are a icon to download the project) but no success.
View 1 Replieshow can i make a piano type app, so when you press a button, it plays a file, if this can be achieved ill need help scripting itI like.....
Understandable Answers
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I am developing a software for musical trainning. By now, the user can only use the keyboard of PC. I want use also a music keyboard/digital piano.There is a code that get information of what key was pressed? For example: the user press the B note (not the letter B), and the software recognize this. Remember: I am not talking about PC keyboard, I am talking about music keyboard.
View 3 RepliesI'm trying to create a virtual piano using pictureboxes to represent keys that play .wav file versions of notes. I've gotten this to work fine; however, I'm having trouble with two features I want to implement.The first feature is to be able to save what I play in a text file. I thought I could use this code but I'm getting an error. [code] The second feature is to play random keys using the random class. Is there any way I could store the pictureboxes in an array and then use the random class?
View 3 RepliesI've been tinkering with Delegates, and now Multicast delegates. Every time I invoke two delegates It only displays one of the two delegates per invocation.
[Code]...
I'm working on an application that contains a "BackgroundWorker", the "BackgroundWorker" worked fine but after I started to change some stuff it gives me an error ("Exception has been thrown by the target of an invocation.")... I used a breakpoint to see where it happens, the exception gets thrown at the "End Sub" line of the BackgroundWorker.I then deleted all the code inside of it and ran it again.I still get the error.
View 12 RepliesWhat is the meaning of this error message?
"Exception has been thrown by the target of an invocation"
Instead of words, here is my code's logic :
while loop
run BGworker01
run BGworker02
...
run BGworker09
application.doEvents
thread.sleep(10)
end while
All the bgWorkers do the same thing (sending some data, only to different locations). When I run this loop with only 1 Background-Worker, it's all fine, but when I add the other bgWorkers i get the mentioned error at the "application.doEvents" part of the loop. I think it also points to another place (highlighted in green) inside one of the bgworker's code :
Dim FileStreamToSend As FileStream = New FileStream(fileToSend, FileMode.Open)
I thought it might be a problem that all bgWorkers are trying to read from the same file together, but when I tried using different file for each bgWorker, the problem persisted.
I want to use mozilla control in my application.. But when i use Webbrowsercontrol i just use
webbrowser.navigate("http://www.google.com")
but this commant is not working with mozilla control ant when we try to navigate to any web address it gives following exception.
Exception has been thrown by the target of an invocation.
I know this is a relatively common error but I am working in an application that allows custom reports to be written using vb.net or C# for scripting. Error handling is very poor and I am not knowledgable enough to add my own (if it is even possible).
My code simply retrieves a value that is stored in a textbox on the report formatted as LastName, FirstName and truncates all characters after the comma. This value LastName is placed in a new textbox on the report. Here is my code:
Sub Detail1_Format
Dim lastNameFirstName As String = ""
Dim lastName As String = ""
[Code]....
The error happens when I use lastNameCommaIndex to set the number of characters in my substring. If I replace it with a number the report is published properly.
I am using a background worker to process some login information. However, the background worker has to stop and wait for 2 events to happen. Once these have finished the background worker can complete its job. They are callback that will call the Set() method of the AutoResetEvent.
So I am using AutoResetEvent to set when these 2 events have finished. However, I seemed to be getting this error message
"Exception has been thrown by the target of an invocation." and Inner exception
"Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index". The exception usually fires when the registration success leaves scope.
The code for the background worker.
' Waiting for 'Account in use' and 'Register success or failure'
Private loginWaitEvents() As AutoResetEvent = { New AutoResetEvent(False), New AutoResetEvent(False) }
[Code].....
What is ado.net synchronization services and how to use these services
View 1 RepliesCurrently I m working in backgroundworker .but suddenly it begins to throw an exception
Exception has been thrown by the target of an invocation. source:mscorlib
stack trace :at System.RuntimeMethodHandle._InvokeMethodFas
I have a winform where I have some controls like TabPane, Label, ....When I launch my application without localization, it works fine. When I put localizable parameter True, I have this error :
TargetInvocationException was unhandled
Exception has been thrown by the target of an invocation.And when I debug my application, I follow the execution, program begins executing InitiliazeComponent(). I press F11 to continue the debug, program executes the TabIndex event of my TabPane and on the first instruction it crashes.My environment is VS2008, Framework 3.5. I store my project on a network hardisk (I test on local and it doesn't work too)
How can I play a tone or beep using VB.NET. I don't want to use Console.Beep() because I want the tone to always come out of the speakers, not the speaker on the motherboard.Goldfish64
View 1 RepliesI'm looking for some pointers on implementing Custom Events in VB.NET (Visual Studio 2008, .NET 3.5). I know that "regular" (non-custom) Events are actually Delegates, so I was thinking of using Delegates when implementing a Custom Event. On the other hand, Andrew Troelsen's "Pro VB 2008 and the .NET 3.5 Platform" book uses Collection types in all his Custom Events examples, and Microsoft's sample codes match that line of thought. So my question is: what considerations should I have when choosing one design over the other? What are the pros and cons for each design? Which of these resembles the inner-implementation of "regular" events?
Below is a sample code demonstrating the two designs.
Public Class SomeClass
Private _SomeEventListeners As EventHandler
Public Custom Event SomeEvent As EventHandler
AddHandler(ByVal value As EventHandler)
_SomeEventListeners = [Delegate].Combine(_SomeEventListeners, value)
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I am creating a programming that is sending info for one pc to another over RF. The desktop show create a xml file. It writes some of the info but not all. I receive a Target Invocation Exception Error. I realize I need to slow down the incoming Data. I want to use a timer to slow it down.
View 4 RepliesIt errors often (not in a system damaging way) but enough that it bothers me.
Code
Public Shared Sub Fire(ByVal thisEvent As [Delegate], _
ByVal ParamArray args() As Object)
[code]....
Common Error
User Message: Async event fire error.
Error Type: System.Reflection.TargetInvocationException
Error Message: Exception has been thrown by the target of an invocation.
[code]....