Removing Flickering Without Double-Buffering?
Feb 22, 2011
I am having a similar issue with the double buffered set to true for a picturebox. I customized a picturebox control in vb.net where, a panel contains the picturebox.
Upon a mousedoubleclick of the picturebox, i scale the picturebox width wise a certain scalefactor, so that the picturebox is greater than the size of the panel. I am doing this for horizontal zooming and panning. With that said, the picturebox could become large in size.
At certain screensizes, after scaling the picturebox 6 times the size of panel, at fullscreen, i receive an error messsage implying "Not enough memory available to process the command."
However, when i turn off double buffered, i dont get the error, but i get much unwanted flickering.
Here is my code in the Paint Event:
Private Sub picPMGraph_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles picPMGraph.Paint
Dim i As Integer
[Code].....
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Nov 17, 2010
I have a htpc project that I am working on. The main program loads dll plugins which are basically other win forms. On each of these forms, including the main program, I use a picturebox (a double buffered picturebox) for the background image and then draw everything on it by hand. Whenever I load the form from the dll and show it, I get a weird flicker. It looks like it is the previously used double buffer. Is there any way to clear the background double buffer before the flicker? Or am I going in the wrong direction?
Here's a couple of videos of the problem:
[url]
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Notice the black screen with the white lines on it or the flash of the desktop after I click "Movies." How do I get rid of that?
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Oct 26, 2011
But this solution only seems to be good fo XP and does not seem to work in 2010 unless I'm running it in the wrong sequence.
Private
Sub Setup()
Me.SetStyle(ControlStyles.OptimizedDoubleBuffer,
[code]....
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Oct 2, 2009
I'd like to set a panel to double buffered to prevent the massive flickering that I've got while I slide panels in and out of my form, but I'm not sure how to.I've Googled it, but all I've found is snippets of code which I don't know how to use. It involves something about creating your own class with double buffering enabled and then creating a panel from that class.
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Feb 7, 2009
I'm having a lot of trouble getting Double Buffering to work for me. I've gone through about 30 sites but I can't seem to get it working for myself. I'm making a boardgame for a school project, and I have the characters (Who are just shapes with Happy Faces from the Visual Basic Powerpack OvalShape) and I have them moving with this
If intCurrentSpace(1) <> intTargetSpace(1) Then
intNextSpace = intCurrentSpace(1) + 1
Else
[code]....
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May 24, 2011
I have to make a listbox with a few(8) names in it & double clicking on a name in the listbox will removed the name from it. I have already add the names into the form using the listbox.items.add method & would display the names in it. Then I enter the coding for 8 names in double_click procedure (listbox) using the "listbox.items.remove" method. However, when I try double clicking on a name in the listbox, it would remove all the names instead.
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Feb 21, 2009
Im trying to buffer data being written to a device on a com port. The equipment attached to it does not use any form of flow contol and if you write to much information to quickly it falls over. So I have had the following thoughts.
I would create a list of strings and when I wanted to write data to the com Port I would just add the string to the list. I would then have a Sub running its own thread to step through the list, write the string to the com port ,pause a fixed amount of time, remove string from list and repeat until the list is empty. Then keep looping the above.
Code I have so far is below
Private MsgList as new List (of string)
Private sub MsgPump ()
Do
[Code]....
THis does work but If I add strings to MsgList to quickly it throws an exception.
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Mar 15, 2011
This will be my first post on this site, so I thought I would make it a doozy. I have an web application on our site at work that allows users to login to the system, and submit filings for dockets that our state agency governs. Without getting to involve with what that means, they basically upload mostly .pdf files, but there are others that are acceptable to upload as well. The current system that is being used, uses a simple FileUpload and saving it to a folder on the d: drive of the webserver. I ran into a problem that with anyone outside the building/network, the upload is extremely slow and seems to be limited files no larger than about 1.4MB. There have been a few cases where larger file have made it through, but those ar few and far between. I've tried a couple different 3rd party components, but seem to run into the same limits. So, I install the FTP server on the box with the IIS and am trying to go the FTP route using ftpwebrequest.
Below is what I have put together so far:
Imports System.Net
Imports System.IO
Partial Class _Default
[CODE]...
This seems to work as it is at the moment, but I know it has a long way to go for catch exeptions, speeding it up...
1.) The first problem I have run into is if you try to upload to large a file, you get Out of memory error. I'm needing to change the buffer so that it is buffering chunks instead of the entire file. I've googled over and over again and seem to find several good options in C#, but can't seem to convert them to VB. So, could some one give me some idea how to take what I have and change the buffering to use smaller chunks.
2.) I need to catch an empty UploadFile field.
3.) I will eventually be changing this so that it handle multiple file uploads like my current system uses. (Did I mention that I'm new to the ASP.NET and have been programming in .ASP)
4.) As you will notice from my list of acceptable file types, I might have a problem with some needing to be upload as Binary and some not. So I'm going to have to come up with a way to test and change the Requested.UseBinary = False as needed.
I'm sure that I'll find other items as I progress or the big bosses will find other things that they want to add, but for now.... I know that given enough time, I will get all of these items worked out.
By the way, we have a network adminstrator that leave a lot to be desired and most IIS and now FTP I'm having to learn, implement and configure. I'm wondering if there is anything else that could be causing these limits in file size. Since I've tried 4 completely different forms of uploads and they all seem to run into the same limits, I thought there might be something in a router, firewall, server configuration.... that I might need to look into as well.
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Sep 3, 2010
My datagridview flickers and is very slow while loading. I reflectored the datgridview from Microsoft and discovered that there is a back buffer property which is not visible from the winForm. How do I set this property?
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Dec 24, 2008
Hi there..
Im hoping to update a label with the text "Buffering" and "Done" etc. according to the status of the Media Player i have embedded.
I can achieve this, but i do not know a way of constantly refreshing it so that the status is updated. Is there a way i can update it without the use of a timer?
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Jan 27, 2011
I have a situation where I am handling both single & double mouse click events on a form. In both cases something has to be loaded, however when a double click occurs, I do not wish to execute the code attached to the single click event.Is there a way to intercept the mouse click's and check if double or single and then execute the right event appropriately?
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Feb 9, 2010
My Application having MDI Form & many MDI Child form.When I open MDI child forms one by one from MenuStrip , I saw Flickering effect of fom?
Imports System
Imports System.Text
Imports System.Data.SQLite
Public Class frmMain
[code].....
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Oct 24, 2011
I have read everything I can find, and understand some of it. I don't know what I am missing though. I can't get the flickering to stop. Can anyone help me? I've been using VB 2008 for months now, but I am new to the graphics bit. At first I tried using an ellipse from the powerpack, but that flickered even worse.
[code]...
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Dec 6, 2010
I am working with GDI+ to draw backgrounds for my forms. I have a main form with 4 tabs, which all flicker. There is a gradient background behind them (bitmap drawn in GDI+ at Form_Load). I have double buffering enabled in the following manner:
Me.SetStyle(ControlStyles.UserPaint Or ControlStyles.AllPaintingInWmPaint Or ControlStyles.OptimizedDoubleBuffer Or ControlStyles.ResizeRedraw, True)
Everything on the form rarely flickers. The only times are when I am resizing, the numerous docked controls on my piece-o-junk netbook flicker momentarily, which is hardly noticeable. On a normal laptop it runs quite smoothly.The problem of which I speak is right on the headers of each tab (the white rectangle with text on it). When I move my cursor on or off of it, it will flicker. What is actually happening is that it is momentarily disappearing then re-appearing. This seems to be a control paint bug.I've tried the following override, without success.
Protected Overrides ReadOnly Property CreateParams() As System.Windows.Forms.CreateParams
Get
Dim cp As CreateParams = MyBase.CreateParams
[code]....
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May 27, 2009
I have a combo box on a form, it has a large number of values in it (about 40000). When the combo box populates it flickers from invisible to visible for about a second.After investigating this I am sure that it is not the call to the database that is causing this but when the combo is drawn.
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Jan 24, 2011
I am designing a Win Form in VB.NET and Using Table layout in it. Problem i facing is, My WimForm is flickering every time it is load.
Kindly suggest me permanent solution in VB.NET . Why this problem occurs ? Is it because of Table Layout ?
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May 18, 2010
I have a form where i put controls at runtime. Everything works fine and fast. I also set the doublebuffer property of the controls to true and then there is no flickering at all. But then i proceed to add an image in the background (also during runtime), but then each item i move is flickering even if i remove all the controls and only leave the background image when i move another form it flickers anyway.I put an example below of how im adding the image.
Public originalImage As Image = Nothing
Private Sub Panel2_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Panel2.Paint
If originalImage IsNot Nothing Then
[code]....
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Dec 11, 2009
I am using this code for syntax highlighting in RTB and it works pretty nicely except for the flickering part.
VB.Net
Private Sub txt_source_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txt_source.TextChanged
Dim words As New List(Of String)
words.Add("<p>")
words.Add("</p>")
[Code]...
How would I prevent Rich Text Box from flickering?
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Jan 28, 2011
For some reason while using syntax highlighting, my RichTextBox flickers alot.
Public Shared Sub SHSet()
Dim words As New List(Of String)
If ScriptEditor.RichTextBox1.Text.Length > 0 Then
Dim selectStart As Integer = ScriptEditor.RichTextBox1.SelectionStart
ScriptEditor.RichTextBox1.Select(0, ScriptEditor.RichTextBox1.Text.Length)
ScriptEditor.RichTextBox1.SelectionColor = Color.White
[Code]...
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Aug 21, 2010
Dim Buddymarks As New WebBrowser
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Dec 17, 2010
There are multiple examples of modified TabControls on the Internet which allow the user to reorder the tabs using drag and drop. However, all seem to use the following technique:
Determine which tab is being dragged
Determine the index to which the tab is being dragged
Empty the tab page collection and add in the new order
The last step, hoewever, causes the control to flicker alot. Besides this, when there are a lot of tab pages on the tab control, it is rather slow.
Is it possible to swap items (i.e. swap indexes) in a TabPageCollection, without the TabControl flickering?
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Jul 8, 2011
im getting flickers almost everywhere in my app.
1. Enlarging form
2. changing label text
3. reloading multiple images
how to correct this. Look terrible
Ive attached a pic of how the labels are missing during the flickering, couldnt get an image of the white flickering
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Mar 6, 2011
I use Visual Basic 2008, I've got a flickering problem when using Timer and call Graphics.clear routine. I have read many advices to avoid this Flickering problem and try to use them but I still can't fix this problem of flickering.
Here is all of my simple code :
Public Class Form1
Dim r As New Random
Dim b, c As Integer
[code]....
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Aug 19, 2009
I know that in primitive versions of vb (as found in excel) there was a line that you could insert t prevent screens from flickering to and fro when it is trying to process something.Application.screenupdating = false
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Jan 18, 2011
Does anyone know what causes and more importantly how to prevent the flickering you come by when painting a control?
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May 2, 2011
I'm having problems with flickering well using transparent TableLayoutPanels. I have a label that I'm using as a count down, it's anchored to all 4 sides inside a TLP and when the numbers inside the label box change it causes a white flicker inside the TLP.I'm also getting a lot of flickering when the programs first opens.url...
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Aug 15, 2011
For greater accuracy I should use a Decimal instead of a Double ( so I've been told ). Why then have Microsoft chosen to use DOUBLE for most of the functions that return a floating point value in the Math Class?
[Code]....
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Mar 5, 2012
i have developed a windows application whose interface has multiple picture boxes panels with background images for rich look and also a usercontrol which contains a gridview and WPF scrollbar in an element host. All these controls are placed in one panel (this is also having a background image) which is equal to the size of windows form. The reason for placing all these controls in the panel is that the window can be resized, if needed, allowing scrollbars.
Due to these large number of controls in which some of them have transparent backgrounds loaded in a large panel having background image, the window is flickering when moved or any other application's window is moved over it.
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Aug 3, 2010
i am making an RPG game with visual basic...The character is a picture box.The problem is when i move the charactor with the arrow keys it flashes black for a milisecond. I think added animated walking where it slowely moves 32 pixels but not it goes black the whole time... what can i do sto stop it going black everytime it moves?
Old movement
If e.KeyCode = Keys.Right Then
player.Image = My.Resources.mainplayerright
moveto = New Point(playerx + 32, playery)
[code]....
That code moves the player slowely but causes a big black line to merge then just ends up teleporting the player..How can i get rid of the black flash during movement?
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Dec 23, 2010
The TreeView control in my application was working fine until i added *small* icons, now whenever i try to open a node the selected node and the one above flickers...
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