What is the fastest way to receive TCP (with 'read') and update a form with the data?
A background polling thread seems to messy.
But is there a TCP receive/read event that can be added to the form, so that the form can pick up the incoming data to display it?
I am producing a marine radar display in VB.Net and struggling to get the radar data to display quickly enough.The data is coming into my application from a callback from the radar maker's dll. Each dataset consists of an integer between 0 and 8191 denoting the angle from the datum (ship's head) that the dataset represents and a byte array with 480 elements containing data from ship's position (byte 0) to maximum range (byte 480). Each of these locations is a single byte, I want to set both red and green components of the relevant pixel in a 1000 x 1000 bitmap to this byte value. The dataset number increments round from 0 to 8191 as the radar scanner rotates.
My first approach was to use math.sin and math.cos to convert polar coordinates to cartesian coordinates, and then use setPixel to set the colour of the relevant pixels but this is far too slow.I'm now trying to use Boop Boops 'FastPix'
[URL]
Which looks like it should be much better, but I am wondering if there is a more efficient approach, for example cutting out the polar to cartesian conversion, or putting the data direct into a byte array?I am also running the radar picture processing code on a thread separate to the UI thread to keep the UI responsive - what is the best way to display the resultant bitmap onto the UI? I am currently using a delegate and putting the bitmap into a picturebox?
Showing of my forms is somewhat slow, I am thinking of loading them when the app is started but I am worried it will take too much memory. What other means can I do to make the showing of the form faster?
View 8 Repliesim using krypton free toolkit and we all know the speed is not good?i should try and code in diffrent ways using more apps to do small stuff taking more load of app but just an idea?
View 1 RepliesIn my MVC Web App I am running an ActionResult with the following signature: Public Function Create(ByVal article As Article_Ad) As ActionResult And in my ASPX page I have declared the following form which fields correspond to the model, which is strongly typed:
[Code]...
How can one pass http get or post methods to a windows application? I require a webserver to send a get method to my windows form application that will querry a database then reply back to a webserverI'm developing a windows based search engine that searches a MySQL database. It receives a keyword from an SMS gateway software as a HTTP get request and should reply to the gateway software using the same HTTP request.This is my code. It is correctly searching the database but I don't know how to receive the get methods on the application however it's sending the messages to SMS gateway.
Private Sub bSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bSend.Click
Dim request As HttpWebRequest
[code].....
I've been trying to figure out a way, to receive Click events(Clicking a Link) back to the form from a WebBrowser control, as the BeforeNavigation2 event does not fire in either VB/C#.Has any body got any ideas how to do this as All the example I've seen in the past just dont seem to work in VS2010
View 6 Repliesthe application I'm building is ALMOST done. The ONLY final feature I NEED to add is the ability to receive email. Now I'm using VB 2010. How would I go about doing this? Would I use 2 listboxes and a form with labels on it to display the message. I haven't any code yet. How in the world do I do this??
View 2 RepliesI really want to make use of the toolstrip and databinding but these two technologies keep conflicting with each other. I think the root cause is something to with the fact that the toolstrip buttons don't recieve focus in the normal way.
I invite you to try the following:-
1. Create a form and put some text boxes a tool strip with a save button on it.
2. Write a query or sproc to get a datatable back and bind your text boxes to the field in the datatable.
3. In the code behind your Save ToolStripButton put some code that makes an arbitrary change to a field on the dataset (it doesn't matter whther this field is bound to a text box or not). eg:-
m_DataTable.Rows(0).Item("CommissionRatePerc") = "0.0000"
4. Put a breakpoint in the save and run the form.
5. Make some changes in the text boxes. Do not leave the last text box but rather click save while a text box whose contents you have edited still has focus.
6. When your code hits the breakpoint, query the value of the data table field that is bound to the text box you were editing when you clicked save - it will still contain the unedited value. Unless you do something about it that unedited value is going to get saved back to your DB.
We did get around this problem by explicetely setting the focus to another control on the form before saving. That worked most of the time because it prompts the text box to flush it's value back to the datatable (nb EndEdit does not work, although you'd have expected it to). However, and this is the reason I suggested you add a line of code that changed a value in the underlying datatable in step 3, if you change a value in code in this way before the value from the text box get's flushed back then it doesn't seem to matter what you do, the user's current edit is simply lost. They will still show in the text box, though, leading your user to believe that the change has been committed when it hasn't. Our final solution is that we never ever change a value in the adtaset in the code behind our toolstrip buttons. That's working but it's a pretty big restriction.
I have a main form with datagridview containing a list of contacts:
VB
Public Class Form1
Private Db As New DataClasses1DataContext
Private Sub Form1_Load
[Code]....
After saving, I get the correct message ("Saved"), and the DataGridView in the first form gets updated in real time.
But... when I take look at the data (or close and reopen the forms) the data in the database (SQL server) have not changed! What happens!
How can I update and get values in a Windows Forms application while moving one form to other form (like cookies)?
I need to update the values to some variable and again I am going to refer stored values and need to do some calculations.
I have used cookies in ASP.NET but I am not able to find out the same concept in .NET Windows Forms (C#).
How can these issues be resolves?
I was using 2 forms, the first one has general data capture and the second one is a calendar form. On Form1 I have mulitple windows controls. A Textb ox and beside a Calendar button. When I click on a Calendar Command button, it should open calendar form and once the user selects the date, the date should be placed in the text box on the form1. Identical to this on Form1 I need multiple textboxes that needs date to be captured.I cannot use a global variable for this as I need to validate mulitple text boxes. To explain this, I have a Transaction Date and Date Received. I need to validate whether Transaction date is prior Date Received or not? I dont want to use several global variables b'coz I might need multiple validations as above. Please help me on this.
View 6 RepliesI have a date selector on mdi parent that updates a property when date is changed. When I open a child form, it grabs the property just fine. However if I change the date again after the child is open the date does not change on the child unless I close and reopen the form as expected. What would be the best way to automatically update all open child forms when the date is changed on the parent at anytime? running a timer to parse the date property is impractical.
View 2 RepliesI update a Form's Title from within the form, but it doesn't update. Any idea how to "Refresh" it so that the update displays?
View 5 RepliesI've been developing a simple virus scanner and it works by reading the hex code of a file and comparing it to signatures from a database. Anyway, the only thing slowing it down is how it reads the hex. This is the hex reading part of my code so far:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LoadFile.Click
Dim ArrayHold() As Byte
Dim Index As Integer = 0
Dim Str As New StringBuilder
[code]....
What I need is to highlight multiple matches within some portion of text as the user types a search pattern. Right now I'm using a RichTextBox to highlight text. The highlighting takes place if a user changes the search pattern and naturally it happens with each key press. It works, but I'm experiencing a performance issues. If the text is large enough the highlighting takes too long (up to several seconds).
Facing that I tried to launch the highlighting procedure in a different thread aborting it and launching it again if the search pattern was changed during the highlighting but still I'm not satisfied with performance. Now I'm asking if there some other control I could use to speed up the process?
Following is the code I used for reading the files and folders from a drive etc.
Public Class LoadingBox
Public counter As ULong
Public OpenRecords As New Dictionary(Of String, MainWindow.records)
[code].....
OK. I am making application for copying. Problem is that every time application wants to write it first tries to write via fast IO and get response that it isn't allowed and then it writes a file (i am assuming without fast i/o). I have no idea what fast i/o is (i know io is input output -> read write). So I can assume that it is handled by class that I am using to write. I am using System.IO.FileStream and its functions Read and Write. Is there any other class that I can use witch will allow Fast IO or disable trying it in first place (I would like the first solution)? Or should I do something else?
View 6 RepliesI need to transfer files from one server to multiple cients (using the internet) in the fastest possible way in .NET . What are the different types of transfer protocols which can be used in .NET or VB.NET so that the files are sent in a very short time ? I have tried using FTP, but that is slow because it requires authentication, handshaking etc. What i want to know is the options which we have in .NET for sending files in the fastest possible way between a server and multiple clients.
View 1 RepliesI have text file which contain the 15000000 Rows with the Comma delimiters..i want to import that file to SQL Table Through VB.net(2005) With 1000 Rows per seconds. Is that Possible through VB.net
View 2 RepliesIn a scientific application I'm writing (vb.net) I use a huge collection of object stored in a tree structure. Every object exposes a LastAccessed property (datetime) that stores the last time the node was accessed by the algorithm.I need to find a fast way to find the N least accessed objects in the structure.I'm using an algorithm like this (pseudo-code)
dim Olist as new list (of myobject)
....
array.sort(Olist,address of compareByDataReverse)
for index=0 to N-1[code]....
I'm sure there is a better way to do that because the list is normally huge ( consisting of more than 10^6 objects).
I have a number of user controls (about 200 user controls) which I want to display on the screen (which the form will scroll).
What is the quickest way of running / opening the page?
would you add the user control on the page during design mode or do it during runtime?
It will also get settings from a XML file like names ect.
I m inserting 30 to 50 records .then set table as datasource to report.It takes 5 minutes.Plz anybody tell me how to do it fast.Then my pc is hangedI have also tried adding datarows into datatable instead of inserting records into access database and set datatable to report.but same time cosumed.
View 1 Replies I need to implement a fast FIFO (First in First Out) buffer which has a fixed size (so data effectively falls out the end, much like a shift register) for a DSP (Digital Signal Procesing) Filter i have written. My question is there any faster way of doing the buffer other than as follows: _
'-- FIFO Buffer
Private Inputs As New List(Of Double)
For i As Integer = 0 To Data.Length - 1
[Code]....
I'm recreating an old 16 bit game. I'm creating the chat normally displayed at the bottom.Each sentence transitions in character-by-character.Every time a character is added, I wanted to have it make that little bleep noise. I've got a wav file that contains a short 'blip' that sounds just right, problem is, when I have it do the blip every time, it usually messes up.
View 1 RepliesI found the below sample to retrieve webpages. I need to request a lot of pages from the same website which requires authentication. Because there are a lot of pages to retieve I like to speed up the requests and like to avaoid to send the credentials and also the certificate. Is it somehow possible to stay connected?
[Code]...
I have written a logon script using Visual Basic Studio Express 10 and it simply installs printers and adds network shared drives. It does look at the users Active Directory group and add drives / printers. But on occasion it doesn't install the drives or printers.
I've placed a copy of the logon exe on the desktop and if the user finds they are missing drives etc they click on this and add them again. This has never failed so I'm curious as to why exactly the same exe would fail at logon? Is it something to do with speed of the computer or a time out somewhere? A frustrating problem!
I have this:
vb.net
Private Sub doWork_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles doWork.Tick
Me.doWork.Stop()
For outer As Integer = 0 To Me.queriedDGV.Rows.Count - 1
For inner As Integer = 0 To Me.hebdataDGV.Rows.Count - 1
Application.DoEvents()
[Code] .....
It works fine when I step through it with F8, but when running normally, I guess it's going so fast that I get an Index out of range when the outer For loop increments to the second iteration. I tried putting a timer in there to give it a chance to update the UI, but that didn't work. I also tried "Application.DoEvents" as a last resort, and that didn't work either.
I have an operation that will be performed MANY times and so I need it to be as fast as possible, thus I think keeping validations to a minimum is important here.I'm given an image, an offset and a size; and the idea is to take the color that appears the most within the area determined by the size and offset, so far I have this:
Private Shared Function someFunction(image As Bitmap, offset As Point, sampleSize As Size) As Color
Dim pixelsColors As New List(Of Color)
[code]....
I have a bundle of tiny pictureboxes on a form. The number is specified by the user, but it could be up to 100, or so. The user can select any set of these pictureboxes by a variety of means. I want to change the image to show the selection state of the pictureboxes, and I'm looking for the best way to do that. The pictureboxes each shows a bitmap. The brute force method would be to have a selected image and an unselected image and just swap them, but it seems like there ought to be a way to do something significant and reversible to the image, such as inverting the colors, that might be smaller that having a second copy of each image.
View 5 Replies