Preload Children Forms In A Background Process?
Jun 7, 2010
on the loan of my application i created a background_worker to pre-load some of my child forms. here is the problem - it seems that the forms gets loaded into the second process and it wont have any affects on the original process .
In another words when i try to show the preloaded form nothing is displayed. How can i ask the background process to "Merge" with the main process when it is completed! i am not sure if merge is the best word to describe what i am trying to do here!!!
also if i try to re load the form that was created by the main process i will get exception saying you can't change one some that was created by another process
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Mar 25, 2010
I have got a couple of VB Powerpack Ovalshapes on my Form.I use these for a quick indication if the networked device is online or offline.I can't seem to control the Visible function (or any other function for that matter) one my Background Worker is running.For my Textboxes I used a guide by jmcilhinney which worked great for them but there is no 'Invoke' property for graphics controls.
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Apr 29, 2009
i make a parent and children form and when i show children form and drag into parents form , when parents is little to show the children form , parents form enables the scrollbar and then show the chilren form better , how can i do something that avoid this status ( don't show scrollbar into parents form when the children form is bigger than it)?
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May 20, 2010
I am trying to create an application. I am using MDI forms method to navigate throughout the application. However, when a user clicks a button to create a new child or when the application execute this code
[Code]...
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Apr 23, 2009
I know this is probably a simple question, but I wanted to load 2 other forms when my mainform loads, but to be hidden. I know how to show and hide the form once it's been loaded into memory, but how to load it in a hidden state?
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Aug 19, 2010
im trying to learn how to code more efficiently and was wondering how to preload combo boxes better. im working on a project atm that has many comboboxes with the same menu information. how to i link the information in a sub procedure when the comboboxes all have different names?
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Oct 11, 2009
I tried to make process that monitores file for changes , makes its md5 hash and outputs.
[code]
Dim f As FileStream = New FileStream(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite, 8192)
Dim md5 As MD5CryptoServiceProvider = New MD5CryptoServiceProvider
md5.ComputeHash(f)
[code]....
It doesn't output at all, it seams to freeze or smt.
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Sep 17, 2011
I'm using sendinput to send keystrokes to external applications launched from my main application. However , the only way I have been able to get it to work is by focusing the external application then sending input. I want to know how to use sendinput to send keys to a background process without giving it focus.
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Mar 17, 2010
Instead of making a WinForm for my application, is there any way to let it operate in the background without a form or anything?
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Jan 14, 2010
I start my program with a splashscreen and as soon as the mainform is loaded, databases are loaded and data is crunched it shows the form with everything on it. All very nice. But now comes the trick. The form has a strip of 5 tabs on it. The active tab is shown and directly accesible but as soon as i click on the other tabs it needs time to draw everything and calculate its content. And when i have clicked through all of them everything is finally up to speed. How can i speed things up in such away that all this predrawing etc is done in the background just as i got it to work with my mainwindow and its first tab?
I have this in the load sub:
For i = 0 To TabControl1.TabCount - 1
TabControl1.TabPages.Item(i).Invalidate()
Next
But some how this does not do the trick.
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Apr 24, 2012
I wanted a ProgressBarStyle.Marquee animation while a query is running. I don't want the user to think the application is locked up. it's really not progress just MarqueeAnimation. the issue I have is it's not running as a thread or in the background.
Private Sub ButtonExcute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonExcute.Click
ProgressBar1.Style = ProgressBarStyle.Marquee
ProgressBar1.MarqueeAnimationSpeed = 60
ProgressBar1.Refresh()
[code]....
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Nov 10, 2010
I am working on a project and i have come to designing my splash screen... i dont want a useless one what just shows a loading bar what does nothing, im trying to make it useful and show while the main form is loading however this is proving to be a pain in the backside.. i can make the splash screen load when the exe is executed then close when the form is ready but i want to add an animation to the form (just a moving logo) this is just done by me running an timer what changes the location at each tick.. i can get it to work well on its own but when i add frmMain.show() to the code to load the program the animation will not work... i only get this when i ask the program to load the main form..
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Nov 4, 2011
I'm developing app in VB.NET 2008.
I have one prob that i'm creating excel sheet runtime, loading data and printing excel sheet through my application. Actually it has 150 sheets to print.
i'm printing by using this code
xla.Sheets.PrintOut(Copies:=1, Collate:=True)
To print 150 sheets , its taking around 17 min. so now the user is waiting until printing process finish(ie 17 min ) .
actually i don't want to make him wait, i want to execute this printing process in backgroud. so the user can work on other process in my app.
how to print this in background ?
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Feb 18, 2009
What I'm trying to do is show a form while a background process is running. Similar to a progress bar but not a progress bar. We have a form that has an animated gif (customer request) and that's it. no other controls. They want this form to show while the processing in the background is running.
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Jul 26, 2011
i've the need to close an ffmpeg conversion started in background with the vb.net process.start.I've seen that an ffmpeg could be closed by hitting the key 'q'.How can i send the 'q' key to the running ffmpeg process?
i intercept the process with this code:
Dim pProcess() As Process = Process.GetProcesses
For Each p As Process In pProcess
If p.ProcessName = "ffmpeg" Then
[code]....
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Oct 25, 2010
I am trying to use parallel processes in baclground but it looks like it block the application till all the processes are not completed.[code]...
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Nov 26, 2009
I develop an appliaction which is running a process in the background. This process is "forked" from the application (I'm not using threads). The process may take a few minutes while the 'father' application is waiting to the process output, so I'd like to enhance the application with the following:
a) a "Stop" button (like in IE, FireFox) to stop the process in background
b) A status bar that displays what's going on while the process is running in BG.
how to draw a button or status bar of course... I mean how VB.NET handle with stopping or displaying while something else is running in background and how to do it.
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Sep 21, 2010
I'm working on a website where we'll be getting a lot of videos to be uploaded. To keep things simple and secure, I'm just writing VB.net windows app to suck all the files in a directory in, allow you to set some options, and start the encode by spawning a new FFMpeg process.
[Code]...
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Aug 26, 2009
I have a spreadsheet that contains details of change requests; one row per request. This information needs to be copied into a Word form for sending off to our customer who then completes the response section. To speed up this process I have written some code that utilises the mail merge feature of Word and merges the relevant info from the spreadsheet into a Word form. This runs from Excel when a button is pressed.The problem comes when I go to save the workbook and exit Excel; it stays running in the background as a process in task manager.
[URL]
I'm fairly sure it has something to do with the merge code itself but my knowledge of VB is enough to grasp what is happening but not why it is happening. If I open the Word doc that has the merge fields in it, then open the spreadsheet that houses the info Excel says the workbook is already open.
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Jun 25, 2009
I place a Background Image on my main form to a BMP file, On-top of the Background I have buttons, and Labels. When I execute the code, the labels (which are supposed to be WHITE) along with the text on the buttons is see-through, I can't get it to stay WHITE and not display whatever is behind the form. here is the examples I have, this is what it's SUPPOSED to look like: http:[url].....
This is what it DOES look like: http:[url].....
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Jan 11, 2012
I've been experimenting with background worker to maintain responsiveness and to allow the UI to update while things are being done in the background.I've been having problems getting the background worker to do anything with form controls.For simplicity lets say I have form1 and form2.The background worker is on form1Initially I couldnt get it to edit controls on form1 but by using [code]However the problem came when I tried to get the same background worker to update controls on form2, in this case a text box. With the above code there is no error but it also does not update the text box.Is there an easy way to give a background worker access to multiple forms.
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Jul 16, 2009
I'm trying to make a drawing application I'm currently using the forms background to draw on but when i draw something in the background and then resize it ,the contents in it get erased.Does anyone know a way to make it so the contents dont get erased when i resize it.
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Aug 16, 2011
I would like the main form I am designing in VB.net to appear as quickly as possible. As a result I don't want to fill a datatable in the load event but instead fill it as soon as the form appears, in the background.Then when a user clicks the button a listbox can quickly be populated.
With this in mind I called a function to fill the datable from the _Shown event. The trouble is that the form freezes until the query executes, making the process pointless for my needs.
Does anyone know how to keep the form active while the datatable fills silently in the background?
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May 7, 2009
how to set the volume of the background Music that im using on my app is a bit to loud. what i really want to do is set the volume to like 50% default and have a volume level to turn it up and down this is the code im using for the BackGound Music
My.Computer.Audio.Play(My.Resources.Music File, AudioPlayMode.BackgroundLoop)
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Jan 3, 2009
I have a picturebox with a pic in it, and I have a label on top of the picture.
I want the background of the the label to be transparent, so I set it's background prop to transparent and it's parent to the picturebox. I do this on form load, but for some reason the label entirely disappears once the form loads?
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Jun 17, 2010
when I try to import an image into the forms background the form turns white ( I want another color ) and when I move controls around the pictures of the controls stay the screen. How can i fix this?
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Jun 3, 2009
I have been tryin to get this code to pan a forms background image.
im nNewSize As Image = Me.BackgroundImage
Private blnMoving = False
Private x As Long
[code].....
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Feb 15, 2010
I need to be able to change the start up forms background image and i am lost on how to do it. Below is what I have tried. Can anyone tell me how this can be done.
Code:
'1 try
Dim f1 As frmMain
f1.BackGroundImage = Image.FromFile(Application.StartupPath & "" & "MyBitmap.bmp")
'2nd try
Me.BackGroundImage = ImageList1.Images(0)
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Sep 17, 2009
I'm trying to figure out how to change the background color of a combo box for every item in the selection.[code]This method seems to set the whole combo box back color to whatever the last color was.The color does not change per item.
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Mar 29, 2010
I am using a button to check which PCs are online which works fine so far. The problem is that the app is blocked for this time I click on the button and perform this action.
[Code]...
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