Program To Detect Change In Selected Pixel On Screen - Memory Leak
Mar 21, 2011
I am fairly new to visual basic and have written this program to detect a change in a selected pixel on the screen. When the pixel changes, a sound plays every x seconds. It works fine but after a few hours of operation a possible memory leak causes it to either crash the program or the PC. I have watched the process and I can see 4k added to it every 4 seconds or so. Where this memory leak is coming from?
Here is the code:
Public Class Main
Public pointx As Long
Public pointy As Long
Public areaselected As Integer
Public TimeToPause, SecondTimer, changefound As Integer
The purpose of the code below is to scan a program of mine to detect a pixel color change. It loops through until a change is detected. It works fine for about 10-15 seconds and then I get an ArgumentException was unhandled error. So far this has happened on two different lines at separate times... Image = New Bitmap(Rec.Right - Rec.Left, Rec.Bottom - Rec.Top)
This is a little app that sits in your task bar and check a website for the presence of a simple string. The string is either "ONLINE" or "OFFLINE". THe problem is that there seems to be a minor memory leak, since every once in a while (I suppose when the timer expires) the memory it takes up increases by a good bit. [code]
Inspired from this question, was wondering what are the possible ways to create a memory leak in .Net. I once found one with ODBC Data Access. Has anyone had any experiences with latest version?
I'm trying to figure out some simple code to detect when a single pixel changes color at a location I choose -anywhere- on the screen (ex. 100,100). Maybe with just a msgbox popup when it changes.
The visual basic program will just be hidden and running in the background.
I should be able program the rest of the program around it, I just need the detection part. That is where I am stumped.
I'm trying to fix a problem that is just killing my program's efficiency. When I run it, it starts out at maybe 10M of RAM, but it gradually increases. Within 20 minutes, it can get up to 700M of RAM. Now, when the program is restarted, all of this goes away and starts anew, but restarting the program every so often is a very loose solution. Here's what my program does: there's an array in which many (anywhere from 500-4000 or so) links are placed. I have a webbrowser that navigates to each of these and does an action on them, then moves to the next page. For example: [Code]
And all of the actions work perfectly, but the memory exponentially increases, resulting in a crash if left on for too long. I've searched Google and all I've found is that that's not the actual usage, and that if you just minimize it and maximize it again it will go down, but it did not when I tried it. Why is the memory increasing so much like that, and is there any way to fix it?
working on an application which performs a set of operations on Active Directory based on an op code.The application was developed long back and has been working fine. I recently made few changes, which is causing the Server to run out of memory whenever the program is being run. I also modified the code to make sure that the variables being declared in each function are set to "Nothing" at the end of function so that the memory can be collected by garbage collector. To make sure, I'm also forcing garbage collection to take place at different parts of the program. But, I still continue to have the issue. The program is very big and hence I could not upload it.
The code retrieves a list of rows from a table with opcodes in it and based on operation code, it performs a set of tasks. The problem is that when it loops through each row in the table, the size of memory required by the program keeps increasing (> 1 GB) to the point where the Server (Windows 2003) is crashing. I have tried different profiling tools, but none of them have been able to detect any memory leaks in the program. I'm guessing that the resources are being held up and hence causing this issue.
The follow code can be called about 6K times on the server it is run on then gets a out of memory error in the last catch statement. I don't see what is wrong with the code, it works well up until the out of memory..
Public Function AddUserToGroup(ByVal sSamAccountName As String, ByVal sGroupName As String) As Boolean Try Dim returnStatus As Boolean = True[code]......
How to create a program that detects the screen resolution and change it to 1280x800 or 1024x768? What are the computer requirements to support each of these resolutions. (I don't want for the program to request the user as programs do this especially in Windows Vista, because my program will be created for Windows Vista).
This code was put together for a one time run. It's purpose is to count all the pages in a group of images. After about 6000 of 1,250,000 images in ##X it throws an "out of memory" error. Besides it being thrown together for a one time run does anybody see anything obvious that could be causing the error?
How can I find out the pixel colour of a certain point on a web browser. For instance,WebBrowser1.getPixelColor(0,0) would get the rgb colour value of pixel 0, 0.It doesn't have to be rgb it might be hsl or whatever.The web browser is showing a local web page that is hosted on a network. If there is an error then the screen goes all grey. What I want to do is, if this does happen, display an alert message like - "An error has occurred
I have an empty picture box with the background colour set to the transparancy colour. How can i get the colour of the pixels within the transparant picture box so that i can create a bitmap of the transparant section of the form?
I have the following Leak situation in a VB.NET (.NET2) application: a form - DetailTache (TaskDetails) - in my MDI application is not garbage collected is not collected ofter open/close.
EDIT: Result search from projet of WinComboRowSelected Event. There are 3 usages of this word in application:
Declaration in Class WinCombo: Event WinComboRowSelected(ByVal sender... (only one) Raising: RaiseEvent WinComboRowSelected(sender, (3 raisings) Usage: ...e As Keolis.ctlWinCombo.WinCombo.WinComboRowSelectedEventArgs) Handles cmbProduit1.WinComboRowSelected (multiple handles).
I refresh a DataGridView every second. It has about 50 rows. This ends up using the entire memory of the computer in about 1 day. I wanted to see what recommendations you had to clear up this memory leak.
The DataGridView1 is bound to a DataTable. DataGridView1.DataSource = MyDT
I refresh a DataGridView every second. It has about 50 rows. This ends up using the entire memory of the computer in about 1 day. I wanted to see what recommendations you had to clear up this memory leak.
I am having a very strange memory leak that seems related to databinding. It is very hard to reproduce, so I won't post any code here to do so, but will just describe the problem.We have data entry forms which have controls which bind to custom business objects through a BindingSource object.
I am working on a desktop application in VB.net 2005. The application contains a timer with an interval of 1 min. Each time the timer ticks, a set of functions gets executed, mostly database related.Initially the application runs fine. In processes(Task manager) the cpu usage goes to 100% every time the timer is invoked. But the timespan is around 1 sec(negligible).However as the time passes and after around 20 hours the time span of timer_tick increases to something like 20-30 secs. In this period cpu usage is 100% and the application does not responds. Gradually the time span of timer_tick increases to 1 min and the cpu uses gets stuck to 100% and the application does not responds.All objects are properly disposed. Moreover, this issue is with pentium 4 processors. The application runs fine on core 2 duo.[code]Many Select, Update and delete queries are performed in the timer.This problem occurs when I am using around 7000 records in database.
I am working on a desktop application in VB.net 2005. The application contains a timer with an interval of 1 min. Each time the timer ticks, a set of functions gets executed, mostly database related.Initially the application runs fine. In processes(Task manager) the cpu usage goes to 100% every time the timer is invoked. But the timespan is around 1 sec(negligible).
However as the time passes and after around 20 hours the time span of timer_tick increases to something like 20-30 secs. In this period cpu usage is 100% and the application does not responds. Gradually the time span of timer_tick increases to 1 min and the cpu uses gets stuck to 100% and the application does not responds.All objects are properly disposed.Moreover, this issue is with pentium 4 processors. The application runs fine on core 2 duo.
This is a very simple UDP Listener class. I can add it to my applications and give them the ability to accept a text command from a UDP packet. I use it for simple, insecure, non-vital communication between a couple apps. The code as written here works--except it has a memory leak. The program's memory usage will slowly build until it crashes. I believe I'm doing something wrong with the way I do the udp.receive method or perhaps the threading? I was trying to keep it as simple as possible when I wrote this, but let me know if I'm doing anything wonky here.
I created a simple application to display the current Date/time on a Form (see below). When the application runs, the amount of memory used continues to grow. I don't see any obvious problems. I am running Visual Studio 2008 on Vista Business OS.
[Code] There is a dispose part that is called just after it finishes processing (don't know if it works, but from what I read I should be disposing it? [Code] When I run it like the above, I have NO memory leaks. It works great. I can have it run for hours and generate everything I need without any issues at all. When I change it so the oThread(ThreadCntr).Start() is working and I comment out MQM1(ThreadCntr).RouteIt() it fails around the 400th thread call (keep in mind I only do 10 threads at a time) from using up too much memory. If I run it with oThread(ThreadCntr).RouteIt() commented and using MQM1(ThreadCntr).RouteIt is working, it will run forever without running out of memory.
I am having a problem with an application I have developed, there seems to be a memory leak that causes the application to crash when it fills up the RAM. I have a process that repeats for each row of a given table, while this process works fine there is one line in particular which converts the results of a linq .tolist which is never disposed of. Since this process is only able to be executed ~200 times before an outofmemory exception occurs.
How can I dispose of the instance of each class to clear this memory in between iterations, or failing this is there a particular area in which I can look further to solve this problem?
I am having a problem with a Windows Service I have written, if I enable a certain option I am seeing what I think is a memory leak. I've looked at trying to debug this using crash dumps (the app doesn't crash BTW, I create them using process explorer), .NET Memory Profiler and WinDbg but I am not getting far down to my lack of expertise with these products.
The piece of code causing the problem is below, if I comment the call to this code out, memory usage is fine. What I am seeing is the private bytes for the process going up and up and up. This code is called regulairly and after 24 hours the private bytes for the process are huge (say 2GB) wheras if I comment the call to this code out the private bytes remain at around 160MB, fluctuating up and down as expected.I am not entirely sure if I am disposing of everything correctly (I think I am) and I just cant find whats causing the problem.
Here is the code:
'//CREATE REFRESHER FOR OUR CPU USAGE Dim intProcessIDPre, intProcessorUsage As Integer Dim strProcessName, strUserName As String Dim intPrivateBytes As Double
I'm using a WinForms App built with IdeaBlade and DevExpress ... It looks to me like the DevExpress controls are causing objects to persist in memory. I'm trying to find what is preventing the garbage collector from removing then with little success.
Can anyone recommend an analysis app that is good at finding what handler, etc is holding an item in memory?
I've used AQTime 7 Pro and .Net Memory Profiler, but neither of them seem to make it clear what is causing the issue.
I'm trying to get to grips with how Windows Forms applications manage memory allocation. I'll give you an illustration of the problem. Take this simple winforms app which is a main form with two buttons: one that opens a form containing some random data, and another button that closes all open forms (except the main form) [Code] You can see the memory dropping at intervals (I've marked some of them above) which is good but it still slowly has a minimum that creeps up and up.
This is a very basic illustration of a much bigger production issue with a huge application with 100,000s lines of code and users that keep the app open all day. Over time they open and close a lot of forms and the memory creeps up. Is there any way to force the allocation down? I know I can force GC but this won't do anything as it's the memory post-GC that is remaining high as far as I can see.
This isn't a problem with references as far as I can see because I have spent some time experimenting with just one form in the main application opening and closing it and there are no references after it is closed and disposed and yet the memory still creeps up in a similar way to that logged above. Also if it was a problem with references, I'm not sure how that would explain my test app above.
I'm having an issue which looks like a memory leak in one of my applications (the application uses more memory over time, an after about a week of work it hangs). I've detected and fixed some leaks related to classes I've written (comparing heap dumps taken with sos.dll revealed them quickly), and those no longer increase in number.
Currently, the only thing that dramatically increases over time are WeakReference instances, which increase at a steady rate of 1,000 new WeakReference instances per minute.My code doesn't use WeakReference directly, I never create those myself.
What could cause so many WeakReference instances to be created? I'm using VB.NET, Visual Studio 2008 and .NET 3.5
