Error Creating Windows Handle ?
Aug 23, 2009
In vb.net and made a proj. in vb2005. but when i try to load a particular form(opens up in a mdi container like all others in the project) , an error-error creating windows handle pops up, the line is frmadmn(the form).show
What shall i do? i read a lil on the net about too many handles, user objects etc. but the stats of my proj. at the time of error are-handles-350,threads-17,user objects-235 gdi objects - 159. have these anything to do with the prob.. then what should i do..? i read about the dispose command also about how to use it ? what to dispose...?
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Aug 27, 2010
I get this error as below when I open my "frmAddPrivate" more than 5 times. How I can overcome it?
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May 21, 2010
There are three forms on this application and they are a MDI Frame(frmMain) and two child forms (frmSearchEmp, frmEmpDetail).
What I am trying to do is opening a "frmEmpDetail" by executing "CallEmpDetail()" on "frmSearchEmp".[code]....
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Sep 14, 2011
I've a little program that has got tabControl with 2 tabs - "results" and "log". My idea was that when an error occurs the tab will switch automatically on tbLog to show what the problem was. Most arguably the problem is in threading. This is the code that..I use:
Dim thread As New Thread(AddressOf ExecuteQuery)
thread.Start()
ExecuteQuery executes the query and I'm making an error deliberately to see if I'll be automatically switched to the log tab which is in Try-EndTry procedure:
tbGrid.SelectedTab = tbGrid.TabPages(1)
The program indeed switches to tabLog (which is number 1) but I don't see any controls on it (txtLog), then when I'm trying to switch tabs a couple of times I get "Error creating window handle in a thread". I read other forum threads about it where people as how many controls do they have in their programs but my program does not exceed 70 controls on a form.
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Sep 3, 2009
I am using a Thread object to perform a function. This function performs a task and displays its progress in the gridview (like adding rows changing text etc )
The reason I am using a thread for this function is that there is a cancel button on the form. While the task is in progress, user can click on cancel to abort it.
Private Sub BtnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnStart.Click m_Thread = New System.Threading.Thread(AddressOf myfunction) m_Thread.Start() End Sub
The function works fine and thread is completed. But calling any method of datagridview after thread is completed ( outside the worker thread ) generates an error- "Error creating window handle".
That's probably because i am not using the invoke method of datagridview for calling its methods or readingwriting properties Do i have to create separate delegates for all the methods properties used in the function ( worker thread)
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Jul 14, 2012
I'm in the process of converting a VB6.0 application to VB.Net (2008 Express). I have a MDI parent form, I'll call mdiBackground, and 4 MDI child forms, frmStatus, frmShow, frmQwerty, and frmSentence.The layout is as follows:mdibackground - has the menus at top and is a container for the child forms.frmSentence - appears at the top frmShow & frmQwerty - appear at the left and when one is closed the other one is in the same position.frmStatus - appears at the right, it has buttons which control when frmShow and frmQwerty are to appear I have a couple of regular forms that act as dialog forms. The Me.Close() works fine on these.
[Code]...
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Jan 10, 2012
We have a VB 2008 Windows application that is deployed on several hundred computers. For some strange reason only 2 computers out of the hundreds are experiencing the "Error creating Window handle" error. It is happening more consistantly on one machine than the other. Any idea what might be causing annoying error on such a limited basis? (It's a Windows XP machine that it is happening on. That's all the info I know regarding the machine currently.)
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Aug 4, 2010
unhandled exception has occurred in your application. if you click continue, the application will ignorethis error and attempt continue. If you click quit, the application will close immediately"error creating window handle"What is this and how do I get rid of it?
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Jan 18, 2011
getting an error when creating a new record in SQL db from a windows app form.Here is the error:
System.Runtime.InteropServices.COMException (0x80004005): Data provider or other service returned an E_FAIL status.
at ADODB.RecordsetClass.Update(Object Fields, Object Values)
<code>[code]....
Error is occurring on the update step.
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Apr 3, 2010
I am getting error "Exception from HRESULT: 0x800A03EC" near (******). can anyone please help me out. i have seen [URL] this blog also but there are also errors in that. can anyone please provide me the correct code for creating a pivot table. The code is,
Imports Microsoft.Office.Interop.Excel
Imports System.Runtime.InteropServices
Imports System.Data.OleDb
[Code].....
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Apr 3, 2010
I have been receiving the error "Exception from HRESULT: 0x800A03EC" near (***) in the code below,
Code:
Imports Microsoft.Office.Interop.Excel
Imports System.Runtime.InteropServices
[code].....
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Sep 21, 2009
I'm creating that sets up project directories based on a template and also allows users to select folders from the template to add to a selected path (their project dir). I've got everything figured out as to creating the directory initially except for 1 thing that ties into another (stick with me here). I'd like to create the directories based on a text file or some sort of config file. Essentially, I would have a text file that contains lines like:
oot
ootsub1
ootsub2
[code]....
etc. Then when I create the directories, I can create them based on these lines. I think I can figure that part out myself. Where I'm stuck is on comparing the selected dir to the template dir. Right now I have a treeview control with checkboxes that is populated based on a path that the user selects from the folderbrowserdialog. What I need to do is compare the selected directory with the directories in the text file and if the directories exist (match) then they are checked. If they don't exist in the selected directory then they are unchecked.
If a user wants to add a directory from the template, they check the box for the dir they want and uncheck the boxes for the ones they dont. Then hit apply and the app will either create or delete the checked/unchecked dirs. What's the best way to handle the template dir? Should I do the text file thing or should I simply have the directory structure setup somewhere where the app can copy the dirs from the template to the selected directory? Or should I use an ini file? I want to make the app flexible so that down the road, if they change the template layout, or where the template lives, the app can be told that. So I need to add a way for the users for example to choose the template directory (but not everytime!) or specify the path that the template dir txt file lives.
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Jun 19, 2009
I want to create a .txt and then run a batch file which runs a .pyc which uses this file as a parameter. When I do this, I get a message that says the python program was unable to access the file. However, if I break after creating the .txt, then manually open, save, and close it (note: open close only doesn't work), and then continue running my code, it works fine. I think that my program still has control of the text file when the python program tries to access it, however I don't know how to release control.
'array input is system.arraylist of all words that I want to have in the grammar
Dim fso As FileSystemObject
fso = CType(CreateObject("Scripting.FileSystemObject"), FileSystemObject)
[Code]....
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Apr 30, 2011
I've been trying to find a Windows API function I can use to generate a virtual file handle in Windows. I'm working with VPC/xVM and I want to create a virtual machine that actually points to my physical hard drive - the methods provided with VPC and xVM for this really suck (I've never been able to get it to work with either virtualization product).
[Code]...
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Jan 9, 2012
I know this idea of - if message boxes are used to display error messages inside a .dll and when the .dll is installed in a different computer (possibly a server machine), errors occurring inside that .dll will be shown in the server and not to the user. Since practically there will not be a person near the server to click 'OK' to the error message every time it occurs it will stuck the programs using the .dll.
So how to write exception handling to a .dll project?
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Dec 8, 2009
I have the following Stored Procedures create or replace PROCEDURE WEB_AC
[Code]...
First one: At some point in the application I have the valor parameter (of the visual Basic Function) as a string with spaces that is something like "some string with spaces". When this happens, the stored procedure don't update the table. If I execute the SP directly in the DB (with SQL Developer) all works fine. I know it has something to do with the string missing some quotes(') but I haven't make it work yet. Some ideas on this?
Second problem: Sometimes, when debuging the application, if I interrupt the execution, I start getting the ORA-24338 'statement handle not executed' error for hours every time I try to execute it again. I believe it has something to do with an open transaction. But honestly, as I'm new in working with Oracle, I really have no idea what the problem could be.
[Code]...
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Aug 11, 2009
I have a project that reference from leadtools 16.5, and after that, i want to run my project..i see am error like it " An error occurred creating the form. See Exception.InnerException for details. The error is: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. im using vb 2008 pro
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Dec 2, 2010
I am trying to write a program which needs to interact with other programs.For this i need to find the handle of its window and have the user select the right windows. I am thinking of enumerating all windows and put the in a dropdown box. I was able to do this with visual basic but the code does not work wiht vb express. I need some pointer to find the solution.
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Dec 27, 2008
I have work on vb.net 2005, and want to create a small application for handle windows explorer by my application. In this application my needs are.Open Windows explorer on user define Root folder. For example Root Folder is D:ABC and in this root folder some sub folder are present (Number of folder depend on users). For example in under d:ABC three more subfolder are present 1.NSHARMA 2.APOORE 3.SKHANNA, name of folder is user login name in application.
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Jun 11, 2009
I have work on vb.net 2005, and want to create a small application for handle windows explorer by my application. In this application my needs are.Open Windows explorer on user define Root folder. For example Root Folder is D:ABC and in this root folder some sub folder are present (Number of folder depend on users).
For example in under d:ABC three more subfolder are present 1.NSHARMA 2.APOORE 3.SKHANNA, name of folder is user login name in application.I need when NSHARMA login in application then in D:ABC folder only show NSHARMA folder and other folder will hide, D:ABC folder are present on Common Path.In this Application one more common Subfolder under D:ABC it's Name is SharedFolder, it will Share between all user , it can access by at same time all login users and only how will be see it how is permission for it. For Example NSHARMA and APPORE have permission for this then only they will see this subfolder. Then APOORE and SKHANNA will be login in application that time APOORE will see it and SKHANNA does not see it.
[Code]...
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Sep 21, 2011
I have created a Windows Service in VB.NET (VS2010) that executes a certain task every minute. When the service is being stopped, either manually by the user, or when the system is rebooted, what can I do to make sure the task is being finished properly before the service is actually terminated?
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Nov 6, 2009
My application uses an MDI form, and there are instances where the end user will need multiple child windows open at a time. I need an easy way for the user to switch between windows, which made me think of using tabs kinda like Firefox, or like the tabs in the Visual Studio IDE up at the top where you can switch between open forms and code files.
I'm curious if there is a control in .NET that will already do this? I would rather not re-invent the wheel if I can help it. Google has failed me thus far.
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Apr 9, 2009
The app Im working on is dunning on an embedded xp machine. It recieves input from the serial port from an industrial process, and then a backgroundworker class calculates and updates the single form GUI with the results from the process. Very simple.Now, the customer want to allow automatic download of log files by an USB memory. The process should work like this:
1)User plug in an usb memory
2)SHow a virtual keypad (touch screen) where the user enter a security code
3)If code ok, show a 3 choice screen, if not ok show error message and allow the user to try again.
4) If user choose the "export all" button, this choose form will close and i display another form with a progress bar that show how all files are copied to the usb memory. When this process is complete, I will display teh form that says "remove the usb memory and press ok to restart the application.
As you see here lots of forms are created and disposed based on user choices. My biggest issue here is that I have no clear design pattern to work from.For example.. should I have this "chain" in the main gui form, or should I let each form create the next form. For example on the "select action" form, when I press export, should this form create and show the "copy progress" form, or should all forms be created and destroyed from the main gui form?
Also, such an issue like with the password. I put it as a constant on the main form, to avoid "magic numbers" in the code. And then I ran into problem because the "keypad" form is created on another thread and I can't access the costant on the main form, so I got a cross thread exception.Everything starts when an USB memory is connected. And the OnConnected eventhandler is running on a different thread than the main UI thread. how to design this chain of window creation/deletion is greatly appreciated. I show all forms with the SHowDialog because I dont want the user to be able to close the form unless he/she presses a button. And not by accident press somewhere else.
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Apr 15, 2009
What is the best way to handle resolution issues on the monitor when writing a windows app from VB.Net.I developed an app on my laptop, it's widescreen and res is set to 1440 x 900. When I take my app and run it on a machine with an older Analog monitor and the res is 1024 x 768, all of the forms on the right and bottom are cut off.
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Nov 26, 2011
I have searched other forums, google, etc. and have not find a solution. I am creating a VB.NET application using Visual Studio 2010. My application runs fine inside the IDE. Outside of the IDE, it crashes immediately with an OOM exception. I have compiled the program in both VS 2010 and VS2008. The outcome is always the same. I increased my Desktop heap to 12288 meg from 3072 meg thinking that was the issue, but the outcome is the case. Although the increase does improve my response in the IDE. The error is also being reported as related to mscorlib.dll; and my version is for 2.0 framework is 2.0.50727 and for 4.0 framework is 4.0.30319. I am running Windows XP/SP3.
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Sep 17, 2009
Is it possible to send keys to a specific windows handle without having to bring that window to focus?Right now I have the following code almost doing the trick:
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function SetForegroundWindow Lib "user32" Alias "SetForegroundWindow" (ByVal hwnd As Long) As Integer
Sub SendKeysToApplication(ByVal AppTitle As String, ByVal Keys As String)
[code]....
It will bring the windows calculator window to the top and set the value "1" on it.Is it possible to send the keystroke without poping the window?
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Jan 16, 2011
For an app. I'm making I need to find all the windows that belong to a process.
From all of this windows I want to have the handle and title.
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Apr 4, 2011
I'm trying to show all window titles including the corresponding icons, much like Windows Task Manager does. This works only to a certain extent though - although I am able to get the windows' title bar texts, the icon is not always available.
For getting the icon I pass the WM_GETICON message to SendMessage (source):
Public Const WM_GETICON As UInteger = &H7F
Public Function GetWindowIcon(ByVal WindowHandle As IntPtr) As Icon
Dim IconHandle As IntPtr = SendMessage(WindowHandle, WM_GETICON, 0, 0)
[Code].....
For some windows, this returns just the correct icon. For others, it returns Nothing since IconHandle is equal to 0. In Windows Task Manager and on the taskbar they show up just fine.
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Jan 27, 2012
I try to compile a project with msbuild.exe I have this error :
vbc : error BC30136: Error creating Win32 resources: Error reading icon '"Recycle Bin Empty.ico"' -- The filename, directory name, or volume label syntax is incorrect.
This icon is the Application icon which is in the same directory of the project.vbc is started with /win32icon:"Recycle Bin Empty.ico" parameter.Don't know why MSBuild can't reach the file.
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Mar 22, 2010
how to place a visible image in the splitcontainer so it would be obvious for users to see that the area is movable. Like the split container in SplitContainer Class(System.Windows.Forms) which has the gray with
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