VS 2008 Cross Process Interaction?
Dec 23, 2010
I was wondering if you could offer a hand on something I'm finding a bit tricky.I am looking at basic shell integration. That is, when a user right clicks a file they can select an option that I have specified. Clicking this will allow them to do various functionality. The way the shell is working for me is that I have a registry entry which runs a specific file. That's all well and good but I need to communicate with a process that is already running on the local machine. (To prevent the users from having to enter login details multiple times).
So I need a way to launch an application, which can call a function in a process that is already running, and pass through the file path. The other application takes the filepath and does whatever it needs with it.
I have both separate sides of the application working (it can get the file path fine, and the other application knows what to do with a file path). The problem I am having is actually linking the two together.
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Oct 5, 2010
I've got a Word Addin in VB.net and VSTO that exposes a COM compatible object via Word.COMAddins.Object, so that the addin functionality can be called External to Word, without accesses to Word itself being cross-process.The technique worked in VB6, but with VB.net, it still works, but it's much slower than the same code running directly from the addin via a task pane, as if the calls are all cross process when they shouldn't be.Anyone who's ever done Word automation knows that code that runs perfectly acceptably INPROC with Word (in this case the instance of the ADDIN that Word itself loads), will generally run unacceptably slowly out of process (or cross process).[code]And slow as in a factor of about 10 to 1; what takes 3 seconds to run when run directly from the ADDIN via the task pane, takes ~30seconds to run when called from external code through the COMADDIN.object object. I'm guessing that I'm running into some sort of issue with .net APPDOMAINS or something and what +really+ constitutes cross proc calls in .net, but I've found nothing so far that would even hint about this sort of thing.My next step, barring some mystical insight, will be to code up a repro, which could get tricky because of the shear number of elements in play.
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Jun 25, 2011
I am trying to use my web browser control to get retrieve date from a specific page, including all sub-page content. Problem is some of the sub-pages are on a separate domain and thus I am getting a permission deigned error when i try to access the frame [through document.windows.frames(i).document].Is there any work around to do this, even if I have to manually change security settings? I tried turning all my settings in IE to allow and still same error. I will only be running the app locally and no one will be browsing on IE so I can literally change anything needed to get this to work (even install older version of IE which may allow it but can still handle JS processing).
Note the reason I am using web browser is a great majority of data I will be accessing is JS generated, so I need to access the DOM after JS processed / generated the HTML. Because of this, simply using SOCKETS to get the HTML is really not an option. Even if I had the HTML, I still need some type of engine to process all of the DOM elements based off javascript.
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Nov 13, 2009
What I'd like to do is when a user clicks a button in my windows form application, it launches IE etc and opens webpage, sends the username/password stored on the pc and logins into the main page.Some background-the password will be stored in a txt file on the pc in encrypted form-the webpage am login into is a aspx company intranet page-security is really not a major issue as everything is internal-the main page of the intranet page is just two textboxes asking for username/password before going any further. There is a button to login on the webpageIs what am trying to do possible as I really do not have understanding of how the login page works underneath or for that matter much about HTTP post requests etc
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Apr 24, 2011
i want a code that if a process that i picked is no match in a process list that process that i picked will start
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May 27, 2010
Trying to create a button that when clicked will check to see if a certain process image is running and if that process is running give the process focus. If the process is not running then start the application.
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Aug 8, 2010
Whats happening is I run the code below and get the following error "The system cannot find the file specified". I've read that with UseShellExecute set to false that you can't use WorkingDirectory.
Dim Password As String = "password"
Dim SecureStringPassword As New System.Security.SecureString
For Each c As Char In Password
[Code].....
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Oct 27, 2010
I'm using Visual Basic 2010I've created a ListBox and a BackgroundWorker using designerI want to change the location of listbox using backgroundworker but I get the error as follows:"InvalidOperationException was Handled by user code:"Cross-thread operation not valid: Control 'ListBox1' accessed from a thread other than the thread it was created on
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Nov 5, 2009
This code is from [URL], so I assumed it would have worked, but I am probably missing something simple.
[Code]....
When I run this code, I get an InvalidOperationException (cross thread operation). How can I get my progress bar on the second thread, or does it have to be created at runtime on that thread?
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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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Jan 28, 2010
I'm trying to set the text of a ToolStripStatusLabel in a form, wich contains some ToolStripStatusLabels, a ListBox and a button. I'm setting the text from a BackgroundWorker wich is started from a timer. I thought this would be okay. Well, the problem is that sometimes it works, and suddenly after a while, I get a cross-thread error wich says:
"Cross-thread operation not valid: Control 'ListBox1' accessed from a thread other than the thread it was created on"
Well, where did the ListBox get involved in this problem? The code breaks on this line:
ToolStripStatusLabel3.Text = "Henter data fra eTime-basen..."
So, what am I missing here? I've never encountered this before in any way. I'm only using the ListBox later in my BackgrounWorker, and each time I'm using it I'm checking the InvokeRequired-property to avoid problems with threading.
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Oct 2, 2009
I have a loop the iterate in my ListBox and I got this error. Cross-thread operation not valid: Control 'ListBox1' accessed from a thread other than the thread it was created on.
Here is my codes:
Private Thread As New System.Threading.Thread(AddressOf myFunc)
Sub myFunc()
Dim i As Integer
[Code]...
My Listbox1 is contain hundreds of lines to loop..thats long iteration. and i need the main form keeps responding from other function even loop is under process. This time i need to use this method of multi-threading.
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Apr 5, 2009
Im trying to work with threading on a project im doing but i have run into this cross-thread problem, ive worked with background workers before and never had this issue.ive done some searching and found some good threads this one in perticular[URL]..now i tried to use these examples and i made it work on a differant project but i cant seem to get my head around how to make it work on this project.
[Code]...
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Dec 3, 2010
I have to do a questionaire that gives three questions with multiple choice answers. When the user clicks a radio button it displays a tick or cross depending whether the answer is correct or incorrect. I also want to display, on a label, the number of correct answers with the number of attempts. i.e 1 out of 3. I have listed the code I have for the questions and radio buttons and I know I have to declare form variables but I do not know how to get it to recognise the radio button as a number to add to the total.
Private Sub radBevan_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles radBevan.CheckedChanged
If radBevan.Checked = True Then lblScore.Text = "Incorrect. The answer is Beveridge."
If radBevan.Checked = True Then picTick1.Hide()
If radBevan.Checked = True Then picCross1.Show()
End Sub
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Feb 4, 2012
I'm going to level with you -- although I heard someone say a long time ago "Never use it"! -- and it stuck with me, if I didn't have this in my form load code, my program wouldn't work.Because, to be completely honest, I could never get my head around the issue regarding the serial port and using delegates. (Haven't given up though).
Anyway, the software works absolutely fine with this statement BUT I get a several errors without it based on that "separate threads" thing (to put it in hillbilly terms). is it still "Never use it"? or am I not alone, and some of you have also used "check for illegal cross threads = false"
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May 22, 2010
I'd like to know what the code is to make a picture box not able to cross a lineshape.
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Apr 20, 2009
I recently made some changes to my VB 2008 application, and now there are crosshatched lines throughout parts of my tab-control at design time. When executing the application everything looks fine, and there are no errors generated. Why has this happened?
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Oct 3, 2009
[Code] If I wanted to add 3 icons, the LV would add them like it normally would, but then, for some reason, it enters the loop again and that's when it throws this error: ex = {"Cross-thread operation not valid: Control 'ListView1' accessed from a thread other than the thread it was created on."}. I don't understand why, because I'm invoking the LV.
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Jun 4, 2009
I have written a windows service that is meant to launch a notepad when a specific action happens. The problem i have is that even though the service launches notepad, the actual notepad it self is NOT visible. I know that it has been launced because i can see the process in the task manager. By the way the process is listed as a SYSTEM process rather than a process under my user name (i believe that is because my process is a "LocalSystem" one).
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Apr 1, 2010
I need some help to understand my options to get this working. I try to update a textbox control by a property-changed event from a class variable. I've digged around for a day and have a vague understanding that this can be solved in three ways:
1. Using some "if InvokeRequired", "Invoke" code in the handler method
2. By programming a special delegate class for this variable
3. By using a databinding directly linking the control (textbox) to the class event
Now.. Are these options correct? And would it be possible to get some help to show these three solutions in actual code (relevant to mine)? I can't seem to manage to sort all the information to a working code. Also, what are the pros and cons of the different solutions?
As my code stands now, it's obviously none of the above, as it gives a cross-thread error, as indicated.
[Code]...
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Jun 30, 2010
I was wondering if it is even possible to interact with other websites using my own.Here is the scenario: Lets say I have a Lockerz account, which is a place where you do daily tasks to earn points. Once a month you can redeem those points to get prizes such as an ipod, macbook, or other items. I know that sounds rediculous, but stay with me.
For someone to gain membership to this website they must be invited by a member. So I get your email address then log in to my account, then send you an invite from there.What I want to do is create a website where a user enters their email into a textbox and presses a submit button. From there the program, behind the scenes, sends my login information, and the users email address to lockerz and sends the invite. All without ever leaving my site.I have worked with ASP.NET with VB codebehind for a while now, so I understand the basics of that. I am just wondering if what i want to do is even possible.
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Apr 7, 2012
I have two following rows of code:Microsoft.VisualBasic.Interaction.Beep()or Microsoft.VisualBasic.Beep()The result is the same in this two rows.what is Interaction class?And when shold i use it?
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Apr 3, 2010
I have a static picture, one for hover, and one for press.is there a way to make the picture change depending on my actions with the button?
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Jun 29, 2010
I am using VB within the Visual Studio 2010 platform.I have created a simple Database with Access.I have connected my database to my VB 2010 project using the Visual Basic BindingNavigator object.I now need to navigate my Database with code from within VB 2010.
1) More specifically I need VB routines that allow me to:
·
GoTo first record
·
GoTo a specific record
·
MoveDown one record at the time and sense the EOF.
2)I need to add new records at the end of my database as data become available through a change in four text boxes.
3)I need any other VB 2010 statement or routine that might apply to Database navigation and communication from within VB 2010.
My Database consists of four columns: Date, Time, Bid (Double Integer), and Ask (Double Integer), and was created with Access.Is Access the best solution for creating a Database today?
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Apr 15, 2008
I would like to prompt the user, in the middle of a VB program, either with MsgBox or any other dialog, to input data in a worksheet of the Workbook that contains the code and then, on some event, read the data and continue execution. I was not successful with MsgBox (and other forms) since it is modal. The user cannot get focus on the worksheet, input data and then continue execution by clicking a command button.
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Jun 18, 2009
In the application I'm actually building, I'm dealing with two dynamically-added controls that need to interact with each other, but I've reduced the problem to an as-simple-as-I-can-make-it example with the controls being statically loaded, and it still presents the same problem: a NullReferenceException when invoking the delegate. Here's the gist:
Control 1
Partial Class Control1
Inherits System.Web.UI.UserContr
[code].....
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May 7, 2011
I have set up a scrollbar to have a value between 0 and 264 (i.e. 0-255 when taking the width of the slider into account). I also have a text box that is set up to display the current value of the scrollbar as an interger. However I am currently unable to enter a value in the text box which also moves the scrollbar to its equivilent position. The closest I've been is when I was able to change the value but kept ending up with an error when a number above 255 was entered or when there wasn't a number in the text box.[code]What I am after is to be able to enter a number between 0 and 255 (and only a number between 0 and 255)in the text box and it change the position of the scrollbar accordingly and to omitigate the errors which occur when there is nothing in the text box by accepting an empty box as 0.
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Sep 1, 2010
On my program the user clicks a button which then runs the main code for my program. The problem is once the code is executed I can no longer move or interact with any form boxes, reliably at least . Sometimes there will be a period of delay where I can move it for an instance. Is there anyway I can make it so that my form is able to be moved while the program is running?
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Dec 21, 2011
I think I started out with a misunderstanding of what happens with addnew() and canceledit().
I have a strongly typed datasource in memory.
I call bindingsource.AddNew()
Later I find that the record the user was trying to add already exists, so
bindingsource.CancelEdit()
I have not set any properties other than datasource on the bindingsource.
My assumption was that the CancelEdit() would rollback the blank row added by the AddNew(), but I'm getting some odd errors which lead me to believe this is not true.
Could someone verify that CancelEdit() leaves the new row?
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Mar 12, 2012
I've been studying design patterns off-and-on now for a project I've recently been working on. I've been fortunate with this last one not to have to work with databases, but will soon have an opportunity.
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