VS 2010 - Global Mouse Hook - Can't Cross-threads

Jun 29, 2010


This was the code and this is the thread HERE Ok its working and everything but when i want to perform something when click is noticed it says i cant cross-threads


Intercepting Mouse Events Using A Global Hook Stop An Action From Happening?

Jan 17, 2010

I'm attempting to intercept and interrupt mouse events. Lets say I wanted to disable the right mouse button down event, or even the mouse move event. I haven't been able to figure out the interrupting part.

I am using the (I assume pretty widely used) following code for Global Hooking of the mouse.


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VS 2010 - Global Key Hook Not Working?

Jul 3, 2010

I have a program that u record your clicks then you press a button (Ctrl + E) then it plays them back. What I want is for Ctrl+E to stop them, It would work but it seems like its being overpowered by the mousemoving and clicking. The keyhook did already work before I started on the playback part.

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
If m.Msg = WM_HOTKEY Then
If m.WParam = 2 Then
If started2 = True Then
started2 = False
ElseIf started2 = False Then
[Code] .....

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VS 2010 Way To Control Mouse Wheel Rotation With A Simple API / Without To Hook Mouse?

May 24, 2012

The GetAsyncKeyState Api does'nt recognizes the mouse wheel rotation, I see.Is there way to control the mouse wheel rotation (always, not only when the pointer is over a form of mine) with a simple API, without to Hook the mouse?

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VS 2010 - Hook Mouse Error (DataType Mismatch)

May 21, 2011

I'm using code from here - [URL]. And I'm getting the old
A call to PInvoke function 'EliteSwitch!EliteSwitch.MouseHook::CallNextHookEx' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.
Error on this line
Return CallNextHookEx(MouseHook, nCode, wParam, lParam)
I've tried changing variable types but I can't get it.

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VS 2010 Suppress Global Mouse Click?

Jul 3, 2010

i have a global mouse hook for when mouse is clicked but how do i suppress the mouse click so it doesn't attualy click? It has to be global suppression.

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How To Set Global Keyboard Hook On Separate Thread

Apr 29, 2012

After many searches i end up using this class for global keyboard hooking. Link: Global Hook post [code]My app is performing operations that take some seconds to complete (ftp upload small files on interval), and during this time the hook lovks the keyboard. This i dont want of course..I cant jump to Async FtpWebRequest right now because it needs many changes, so i thought that the solution would be to make the hoook live in another thread.A proposal is to move my time - consuming operations (upload) to another thread.Upon doing this i am facing other problems. Because the time consuming task (upload) is in a timer i would have to rewrite a big portion in order to synchronize the file->save with the file->upload and i dont mind the app locking for 3-4 secs. what i do mind is to loose the kayboard for 3-4 secs.

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System Keyboard Global Hook - Prevent Any Other (local) Interception?

Feb 20, 2010

My final goal is that striking F12 prints the date (through SendKeys) in the application/window having currently the focus (Word, Excel, Outlook, whatever). I have consequently implemented a globak keyboard hook (system-wide), which is running well (source code below).

My concern is that I would like to prevent any other local treatment based on F12. For instance, striking F12 under Microsotft Word prints the date is the open document (which is fine!) but also launches the "Save as..." dialog box, since F12 is a local shortcut/keybinding under Word. (Actually, the date is printed within a field of a the "Save as..." dialog box). I want to avoid this.

In other words, my aim is to improve the "hook" below so that striking F12 does what I want (which is already the case) but nothing more. That is to say, I would like that, except my treatment, the system "forgets" that F12 was striken.

' Option Strict On
Option Explicit On
' inspired by:
' http://jo0ls-dotnet-stuff.blogspot.com/2008/12/vbnet-global-keyboard-hook-to-detect.html


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Cross Link Two Different Threads?

May 4, 2010

this is sumit from Larsen & Toubro Mumbai-India,I am writing a code for some sort of software in which execution of some code is required as soon as my software receive a barcode from barcode scanner (serial input). Now through datareceived event handler i am able to read the barcode but after that i am not able to send this barcode to any textbox or even i am not able to start any other event like performclick to any button or anything. I am getting an exception as cross linking of threads not possible. please refer to the image and give me the solution asap.

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Raise Cross Threads?

Apr 5, 2012

I am getting this error: Unable to cast object of type 'SGA.AppContext' to type System.ComponentModel.ISynchronizeInvoke'.I am not using a start up for my project but a sub main() and a threaded class AppContext

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Communications :: Involving Cross Threads In .NET 2005?

Feb 8, 2010

My application need to communicate with my self made device through serial port. I have to change the selected index of Tabs when I press a button on my device. I have Form1, Form2, Module1 Form1 Contains the Serial Port Control. Form2 contains the Tab which needs to be changed. When I press a button on device them, the button pressed is stored in an integer form in a global variable.The Interrupt for the Serial Port directs the control to the module1 where I decide using Select Case that what index of which TabControl I have to select.Depending on that, I change the Index of the required Tab.

PROBLEM:cross thread exception is fired as soon as the control reaches the statement where I Modify the SelectIndex property from the select case at Module1.While, on my other PC, the SelectIndex property is changed, but the next tab is not shown.

BUT, if I put all this code in a button control, and try to activate from there, then it works perfectly. However, I have to navigate through the tab controls using my self made device.I searched a lot on net and came across a solution which describes that we have to use delegate function and invokeRequired methods to ensure that the procedures run on the same thread.I am not able to decide that where exactly shoud the code for delegates and all be written, in form1, or form2, or module1.Also, in the hit and try that I did, I always got the value of InvoleRequired as False.

Here is the part of Code that I wrote for Delegates



' I have defined these at Module1

Public Delegate Sub DeleToManageTabs(ByVal tb As TabControl)
Public Sub manage_Tabs(ByVal tab As TabControl)


After using this code also, there is no change in working of my application.

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VS 2008 Cross Threads -- Lost In Space?

Feb 5, 2012

Frankly, NONE of this makes sense to me..[URL]..They just jump right into code without baby steps that explain the situation.Every other aspect of VBnet has been well spelled out to me and I get it -- but this business of using the serial port and going nowhere because of a cross thread error has me 100% baffled.

If anyone can point me to a tutorial that really explains it simply and well (without jumping into friggin' code).Even in the above link, they show 3 different techniques of addressing the same problem ! (Like I CARE

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Low Level Mouse Hook In VB

Aug 4, 2011

I want to hook low level Mouse hook in vb, and after that I want to save the X-axis, Y-axis and clicks(Right/Left) into database for later use or automation..But I don't understand that how should I save the X-axis, Y-axis and clicks into a MS SQL databse and later retrieve them?

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.net - Mouse Hook In .NET And Windows Forms?

Nov 15, 2009

I have a form that is displayed, not by ShowDialog, but by setting its visible property to true. This is so it behaves like a dropdown.The form installs a mouse hook, using SetWindowsHookEx(WH_MOUSE, ...).

I detect if the mouse is clicked outside of the dropdown and if so, return 1 in my HookProc method and close the dropdown.The strange thing is, if I click outside of my drop down on to a textbox, the textbox still receives the mouse click, after my dropdown closes, even though it's been handled by my HookProc method.It gets stranger... If I click on a label or button, they do not receive the mouse click, as expected, after the drop down closes!


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Hook Mouse For All Apps / Desktop?

Sep 16, 2010

Using VB 2010, is it possible to capture all mouse clicks and determine what was clicked?We're trying to develop a small utility that will pop up context based menus to fill in application forms and common strings for terminal sessions.Basically, whenever I middle click I want my app to determine if the window was an occurance of PuTTY. If so, check the titlebar for certain strings and send keystrokes to that window based on the titlebar text.If VB 2010 can't do this, what should I be looking for? Will VB6 apps do the job? Will they work on a Windows 7 PC?

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Setup Mouse And Keyboard Hook?

Apr 10, 2009

How do I setup the mouse hook and keyboard hook?

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Determine When A Mouse Hook Has Handled Last Message?

Nov 16, 2009

I have a form, that acts like a drop-down, that I display non-modal. I attach a mouse hook to the form to determine when the mouse is clicked out of it, so that I know to close it - by setting Visible = False.

Because I want the HookProc to handle the last click, I can't dispose the Hook or my Dropdown until I'm sure that my event handler has returned to the HookProc.[code]...

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Hook Into The Mouse Click On A Command Button?

Feb 24, 2011

I need to write an application that can validate wether or not a proper process was followed based on information that was entered into another .NET appliction. Basically, I need to be able to intercept a mouse click on a button in another application so that instead of submitting the data it triggers my validation code then cancel the action if need be.

We do not have the code to the other application. I have everything I need perform the validation. The only thing I don't know how to do is intercept the mouse click on the button control of the other application. Can some one show me how this is done?

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Should Threads Update Global Data In The Main Program

Mar 18, 2011

I want to launch a bunch of threads, each performing the same task, and know in main() when each finishs and it if it was successful or failed.The solution offered was to use a ConcurrentQueue, but other posts have recommended using a BackgroundWorker Class, or a thread pool.Is there a definitive answer?Again, all threads perform the same code and have a pass/fail result. I want to run more than there are available threads so as soon as one thread finishes I will launch another asap - I want tehm to stress a remote systems as much as possible (reather than stressing my local PC with too many threads, so I will need to experiment to determine the optimal number of threads).

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Label1 Text Changes With Link That Mouse Cross

Apr 15, 2010

i want the label1 text changes with the link that the mouse cross above him.

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Global Mouse Over Event?

Jun 22, 2010

i have context menus & want the menu items font style to change to bold whenever the mouse moves over, and return to regular when it leaves.

Private Sub EmnuExitMenu_MouseLeave(ByVal sender As Object, ByVal e As System.EventArgs) Handles EmnuExitMenu.MouseLeave
Me.EmnuExitMenu.Font = New Font(Me.EmnuExitMenu.Font, FontStyle.Regular)


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Hooking Global Mouse Clicks?

May 13, 2009

i found an example for hooking global mouseclicks, but i can't get it running.the error is in the start subroutine, -SetWindowsHookEx failed.what am i doing wrong?

Imports System.Runtime.InteropServices

Public Class UserActivityHook
Public Delegate Function HookProc(ByVal nCode As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As Integer
Public OnMouseActivity As MouseEventHandler[code]....

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VS 2008 Get File Name On Left Mouse Button Click (global)

Apr 22, 2010

Is it possible with API to see what file is being clicked on with the mouse globally?

Ex: On desktop(or anywhere), mouse clicks a folder/file. <The below part would be easy,considering I would already have the above> Usage - A label generates the folder name/file name.

I thought maybe that the DragQueryFile Function would suffice. But, I think that is geared towards a drag and drop operation from with in a .net form.

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Mouse Hook In X-axis And Y-axis Coordinates?

Aug 14, 2011

I am having trouble in getting the coordinates of x-axis and y-axis in low level ouse hook...all I am getting is values in x-axis listbox and in y-axis listbox  I am getting zeros......why? and my second problem is I am calling the setcursorpos
function in a for loop because I want to automate mouse movements and clicks, but setcursorpos function is not working , maybe because I am getting the coordinates wrong.....here is my code 

low level mouse hook

Public Class MouseAutomating
Inherits HotKey
Public lstbox As New ListBox


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VS 2010 How To 2nd Hook

May 30, 2011

almost perfectly works to disable specific keys. but 1problem. for example : checkbox1 checked and then press button1 L win key disable its okey.but then i press button2 to active keys and press again button1.this time not working disabling keys.


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Hook Registry Changes And Maybe Even File System Changes In VS 2010?

Dec 10, 2011

Is it possible to hook registry changes and maybe even file system changes in VS 2010?

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VS 2010 'hook' The Taskbar And Be Able To Rearrange The Buttons?

Nov 6, 2009

I have several windows open: VB, IE, Explorer... If I happen to close one accidentally, or on purpose, and reopen it, the buttons on the task bar are all messed up. I get used to them one way and I am constantly switching between the windows.Here is my question: Would I be able, in VB, to 'hook' the taskbar and be able to rearrange the buttons?I have no idea what to search for in Google. I happened upon a program once a while back, A REAL LIFE SAVER!. I could just click and drag the buttons using that one.

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VS 2010 - Hook Into MSN And Write To Contacts Without Having The Conversation Window In The Front?

Apr 24, 2010

Is there a way I can hook into MSN and write to my contacts, without having the conversation window in the front? a API or something?

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VS 2010 Any Tips Or Techniques For Debugging In Mouse Move Events / When Mouse Button Is Down / Has To Stay That Way?

Jun 6, 2011

I'm currently debugging a form that sets a flag when the mouse button is pressed, then clears the flag when the mouse button is released. As long as the mouse button is pressed, the user can move the mouse around and a few things happen depending on where they move. One of the things that happens is that a timer starts, or stops, and a few things change color depending on the mouse position. The timer starts when it should, then stops when it should, but once stopped, it is not re-starting when it should. I can verify that MouseMove events are getting through, because coloring changes as I move the mouse, as it should. This would be a simple thing to debug...except that it requires the darn mouse button to be down, and it uses the mouse move event. Anybody who has put a breakpoint in a mouse move event handler knows the issue: There are THOUSANDS of them. Worse yet, since the mouse button is necessary for switching to the IDE, as well as setting a breakpoint (technically, a keyboard shortcut could do this if I could shift focus), I can't wait for the problem to happen, then switch to the IDE and set a breakpoint to see what is happening then.Does anybody have any tips or techniques for debugging in mouse move events when the mouse button is down and has to stay that way? As it is, I'm going to have to write some funky code into the method just so that I have a place to get a breakpoint when I need it without breaking on every one of the mouse move events.

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Multithreading - .NET 4.0 Execute Multiple Threads But Threads Are Completed Before Resuming?

Oct 19, 2011

I just had a new, last-minute idea on to take on a task, so I am running to StackExchange for quick help.

What I want to do is execute a series of methods right in a row, each in their own threads. I want the application to wait until all of these threads are completed, after which the program will resume. It also has to use managed threading (thread pool).

What quick examples could you provide to help me along the way? If it's too complex, what things should I know about so that I can Google it on my own?

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Queue Threads - Spawn A Series Of 'child' Threads From A Loop

Dec 30, 2009

I have a main thread which is designed to be a batch processor - it spawns a series of 'child' threads from a loop (which can vary in terms of the no of items) - see below


However, each of the 'child' threads could take anywhere from milliseconds to about a minute to process - depending on the complexity of each calculation. There may also be a large number of child threads - e.g 100s. Creating large numbers of child threads is not efficient. I therefore want some way to effectively queue each child thread (and cancel if the process is taking too long to complete). Autoevents seems like one way of doing this, but the only examples I can find seem to assume there are two different processes on seperate threads, not one process being repeated.

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VS 2010 Cross Thread Is Not Valid?

Jan 25, 2011

am trying to call a Sub from another thread but it always throwing me an error: Cross Thread is not valid.here is the Sub I am calling from other thread.

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VS 2010 Cross-thread Operation?

Oct 15, 2010

I have a sub which is run in the threadpool with this command:

ThreadPool.QueueUserWorkItem(AddressOf UpdateStatus)And here's the sub:
Public Sub UpdateStatus(ByVal state As Object)
Dim ini As New INIAccess
If ini.INIRead(GetX_Games, "-1", "Patched", "0") = "1" Then
StatusLabel.Location = New System.Drawing.Point(120, 145)
StatusLabel.ForeColor = Color.Green


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Changing The Object Declarations To Global Using The 'global' Keyword Evertime?

Mar 15, 2012

evrytime i add new controls to a form in vb.net the designer regenerates code and asks me to make corrections, so i have to keep on changing the object declarations to global using the 'global' keyword evertime it regenarates code,especialy dataset objects.how can i prevent this?

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VS 2010 - Cross Thread Operation Not Valid

Jul 23, 2010

I am getting some cross thread operations not valid when I am trying to run my code. I am handling a button click event to execute a method that runs a process to do a file converison, when the process is finished I run another method that converts the file to zip format, when that is done I run a method to upload the file to a ftp server, and when that is done I run one final method to update my database and the dataset; however, it is liking the way I am running these and I am getting cross thread errors and an overflow error when calling the fillBy method of my table adapter.

Here is the basic outline of what I have:
Private WithEvents conversionProc As New System.Diagnostics.Process
Inside the click event I call the method:

Then I handle the exit event of the Process as:
Private Sub conversionProc_Exited(ByVal sender As Object, ByVal e As System.EventArgs) Handles conversionProc.Exited
' Once the Process to convert has finished it will exit - Flag that we created the KML file
kmlCreated = True
[Code] .....

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VS 2010 Data Table And Cross Reference?

Jun 22, 2012

I Have a c++ program that is already completed but has no ineterface. So What I am trying to do is translate the c++ code over to Visual Basic, which is trickier than I thought. I need to browse for a text file, cross reference that with a csv file which will match IDs and replace in the text file, outputting to a textbox to save

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VS 2010 Get A Max Of Number Of Threads Available?

Feb 26, 2012

I've written an app - that use httplisteners to talk to other winforms (they will be services but are now simple form apps so I can easily show stats as they communicate). One UI app talking to three other "service" apps - all talking to each other as well...Everything uses multi-threading...At any rate - how many threads do I have available - I see that most of the apps seem to run "two or three" consecutive threads - but not more than that.Is that just a byproduct of running in the IDE - or is there a max of number of threads available?When more threads are asked for than are available - do they simply wait to get started for a free thread to become available?

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Use Global X As String In Vb6 In A Module To Declare It With Global Privelages?

May 1, 2009

i could use Global x as string in vb6 in a module to declare it with global privelages, how can i do this in vb2008? how to declare a global variable in vb2008? so that i could use it anywhere i want. i know global variables are not recommended in programming but i need one.

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VS 2010 Cross Platform Application (windows & Linux)

Dec 22, 2010

am devoloping a simple program in vb.net but i wanna do it a cross platform almost (windows & linux) or if there is a vb.net to C++ code converter

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VS 2010 Cross Thread Access Of Serial Port

Mar 29, 2012

In my project I'm trying to send data to Serial port. I have added the serial port control to the form. Now if I try to send data to serial port using Serialport1.write method in a button click event, I'm able to send the data successfully to the serial port. Otherwise if I try to send the data using the same "Write" method from another thread other than the one in which the serial port component was created, I'm getting an exception saying serial port busy.

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