VS 2010 Fast Transfer Byte Data To Picturebox?
Jul 16, 2011
I need to transfer a block of pixel values as quickly as possible to a picturebox control. The data will be in a byte array representing 512 pixels by 4 lines. The data is greyscale values from 0 to 255 but I could easily store each value three times to represent R, G and B if that made it easier/quicker to write the values to the picturebox.I've used fastpix (by Vic Joseph "Boops Boops") in the past but this seems more geared towards fast plotting of individual pixels and as I have a pre-formatted block of pixel data I was wondering about alternatives. I've done a bit of research and BitBlt seems interesting, but can this be used with a byte array as the "source"? All the examples I've seen are for transferring/merging between bitmaps/pictureboxes. How about Direct Memory Access? I just need a simple "brute force" method of getting my pre-formatted data into the picturebox. Oh, when I say "fast" I mean I'd like to plot my 512 x 4 pixels in less than 10mS.
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Mar 15, 2011
I 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.
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Nov 26, 2009
Using a modified version of jmcilhinney's TCP Client / Server system example, I have successfully sent bytes from the server to the client [on localhost]. However, when I try it with a friend, the file sizes become random [usually < 500kb of 1.9mb] , and the file also becomes corrupt. My friend also constantly receives the error "Object reference not set to reference of an object", and my localhost client also sometimes receives that error.
Why is the error occurring.
Also, here are some parts of the code I've modified that seem significant / important.
CODE:
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Jul 21, 2011
I've been trying to create my own backup system by sending specific files to a server running on my desktop, and then having those files copied to an external. So far, I'm trying to send files using a tcp network. Unfortunately, for soem reason, tcp cannot send more than 9kb at a time, so when i tried to send a 30kb image, it recreated 1/3 of it. My fix to this problem was to send data by chunks of 8kb, then reconstruct the file chunk by chunk. For some reason, when I run the server and client, the client says it sends all the data, however the server seems to be stuck. Here is my code;
[Code]...
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May 16, 2011
Is it possible in VB to truncate a larger data type ( an int with a value greater than 255) to a smaller one, say a Byte (which only goes up to 255) in a way such that the 8LSBs of the integer are copied to the newly created byte. I have tried this using CType with the following code, however it does not work.
Dim TestByte As Byte = CType(Test, Byte)
Where the variable "Test" is an integer with a value of 419. This code always results in the Overflow exception.
[code].....
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Aug 4, 2011
I have drawn some lines into a picture box as per an engineering standard. I wish to do the following:
1) Transfer the contents to an excel spreadsheet.
2) Before transferring to excel, it would be nice to add texts at four different locations of the picture box. I have tried various solutions which I found on the net but they were not very successful. The main problem with most of the solutions is that they washed the contents of the picture box which I manged to drawn after considerable pains.
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May 19, 2010
I have a jpeg file that is being held as a list(of Byte). Currently I have code that I can use to load and save the jpeg file as either a binary (.jpeg) or a csv of bytes (asadsda.csv). I would like to be able to take the list(of Byte) and convert it directly to a Picturebox without saving it to disk and then loading it to the picturebox. If you are curious, the reason I get the picture file as a list of bytes is because it gets transfered over serial via an industrial byte oriented protocol as just a bunch of bytes. I am using VB.net, but C# example is fine too.
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Feb 11, 2009
I have a database that stores images as bytes, per Here
What I want to do is bind the image of a picture box to that value through my binding source. This is what I have:
ProductImagePictureBox.DataBindings.Add("Image", productBindingSource, "productImage", True)
And nothing ever shows up. I figure it's because I am not doing something like Image.FromStream(), but I also don't know how to integrate something like that into that line. I could just re do the image box on row enter rather than bind, but I don't know how to manually pull the data from the binder.
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Jan 5, 2010
I formatted my datetimepicker like this "dd/MM/yyyy". I want to move curser once the user enter date then (without enter '/') go to month and then go to year.
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Jun 22, 2010
my event in timer goes too fast, i need to slower it. the interval is ok, i cant use sleep because it freeze everything ( webbrowser control ) and it need to stay active not freezing. i tried application. doevents() no result same problem, is there a way to do what i need? its a program that automatically fill a webbrowser form and restart every-time. there no logout button so i need to use setmouseposition and mouse_event but timer do event too fast one after other and if i use sleep everything go wrong.
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Apr 26, 2010
I know some of you have been aware of my great frustration with the DataGridView control's rendering problem, and of my frenetic efforts to figure out a way around it. Well I stumbled upon the solution, posted by an obvious genius here: [URL] One of the responses to the post (which is in C code) showed how to do this using Visual Basic code.
[Code]...
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Sep 7, 2011
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?
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Aug 7, 2010
Why does C# define Byte+Byte=Int32 instead of Byte+Byte=Byte like VB?
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Jan 21, 2011
I am working on a small desktop form in VB 2010 and am trying to place a pictureBox with an image in it, next to another pictureBox already located on the form when the user clicks a button.
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim tool As String
[Code]....
But for some reason the newPictureBox with image from "ptext" does not show up on the form. When I specify the new Point to be something like, (50,50) instead of getting the first pictureBox coordinates, the new pictureBox shows up in the right place.
Am I using System.Drawing.Point wrong? Or is there some other error that I'm making?
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May 1, 2009
i have a table in sql server with some fields set as Byte() (System.Byte[]) when i import them in my application to be used with linq they are converted in Binary (System.Data.Linq.Binary)why is that?is there a way to prevent this wrong translaton???if i update the database how can i update the classes that has been craeted in visual studio2008?
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Mar 20, 2012
I will use the Background Intelligent Transfer Service (BITS) to transfer files from a client (laptop) to a shared folder on a server within our local network.The problem is a very slow network bandwith, if we transfer a file, the other clients canīt work, all requests to other clients (application) or viewing internet pages needs a long time.My idea is to use BITS in my tool to copy/transfer a file from client to server, also I hope to get more performance for the internet requests.
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Jan 19, 2011
I have 7 variables and i need to transfer them in a dataset I have already create the file with extension .xsd and i have already a report file .rdlc I see the Dataset "DataTable"in my rdlc file but i can't see any field It gives me error of "No Dataset is Linked to the document" From the other hand it sees the dataset in the selection dataset
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Mar 9, 2011
So, I'm making a log in page for 'student'. I've two forms. 1) frmStudentRegister 2) frmStudentHome
in frmStudentRegister page, student will enter his first name, last name, email, major etc and will create his profile. When he clicks on 'register' button, the information he entered on the text box will transfer to the second from frmStudentHome.
I've this codes:
lblFname.Text = frmStudentRegister.txtFname.Text
lblLname.Text = frmStudentRegister.txtLname.Text
lblEmail.Text = frmStudentRegister.txtEmail.Text
lblMajor.Text = frmStudentRegister.txtMajor.Text
But when I debug it, frmStudentHome won't show those entries. It's just blank !
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Jun 14, 2011
I have a sequence that reads the selected Excel-file and displays the first row of the columns in the Excel. (The first Excel row has the column names)
Dim cmd As OleDbCommand = New OleDbCommand("select * from [" & tableName & "$]", MyConnection)
Dim dr As System.Data.IDataReader
Dim dt As New System.Data.DataTable
dr = cmd.ExecuteReader
dt.Load(dr)
With the above code I can read the the first rows of the Excel table and choose the names of the columns I like to keep. (By populating the first row to my ComboBoxes)
So, at the moment my DataTable dt has all the table header names but on the first row. And as the header names it has F1, F2, F3, ... F13.
How can I make my new DataTable dt2 take the first row of dt and make it the column names row? How can I choose which columns do I want to transfer from dt to dt2 ???
I have tried the following (Doesn't work):
Dim dt2 As System.Data.DataTable
dt2 = dt.Copy.Columns("F1", "F2", "F3", "F4")
DataGridView1.DataSource = dt2
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Jun 21, 2009
I am working in Vb Express with MsAccess as database. I have a form with Listview data from Listview is transferred to the TableCustomer it is retrieved from that table back to ListView and after some additions is stored back in Tabloe Customer.I have another table Transaction in the same database which has some common fields of Customer Table in addition to its own fields. My two questions are :. How the data of one table can be automatically transferred to other table in MsAccess?
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Oct 16, 2011
I am developing a windows app and i have a form in which i have 2 datagridviews..
dgv1 is the main gridview with checkbox column and when the user checks the box, that row should be visible in dgv3 (other datagridview)..
The code i used is :
Imports System.Data
Imports System.Data.OleDb
Imports System.EventArgs
[Code].....
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Jun 1, 2011
can any one tell me how to transfer data through gprs to a oracle server using vb .net
i am using this coding below
IPHostEntry ServerEntry;
TcpClient Client = new TcpClient();
Stream SocketStream;
Byte[] InputData = new Byte[256];
[Code]...
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May 22, 2010
i have a form with two list boxes and two buttons to transfer data between the list boxes.one button is the add and the other the remove. some code for these two buttons?
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Sep 28, 2010
I'm currently working on a simple Jeopardy game in visual basic. My selection choices are made from picking the proper radio buttons. Questions is; how do I connect the two forms (form_1 & form_2) so that is will show the proper points after answering a question? I'm using lbl or txtbox for bank total after each question.
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles Button1.Click
'contestestant "Max" choice
If RadioButton1.Checked Then
[Code] .....
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Aug 15, 2010
Basically I want to take My Client.Then for example Lets say in my client I have "A = 1" Then my 2nd file which has random data in it.So Client= My Client File = The File which I want in the end result
How could I Inject "A = TextBox1.Text" from Client to File.I heard it's called "End Of File" or something like that.
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Oct 23, 2009
I am trying to transfer data from one subroutine to another. This is not working "ByVal J(1) As Double, ByVal Max(2) As Double".
Private
Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
...code
Call Data(ByVal J(1) As Double, ByVal Max(2) As Double)
[code]....
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Feb 27, 2010
i'm working on visual studio 2005 vb.net language windows application.and i'm using MS access database with 2 tables customers and stopped. i have a form that the user will enter the IP and the stop date and when i press the button stop i want the all fields that r related to this IP to be transfered from customers to stoppedi wrote this code but i'm getting syntax error but i couldn't recognize the error. please i need help and how to slove it. this is my code:
[Code]...
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Mar 23, 2010
is it possible to transfer data from whithin vb8 programe to excel continiously
in the same book?
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Oct 19, 2009
I want to import a portion of an XML doc into a DataGridView. Is the easiest way to do this to read the XML into a DataSet using the DataSet's ReadXML Method? Secondly if I did not want tranfser all the data from the XML but instead wanted to cherry-pick the element data, what is the best way of doing this?[code]...
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May 9, 2012
I'm studying how to use Visual basics 2010, and I have been asked to create a program that transfers a audio file to one machine, then plays that file when it receives it on the other machine. I have made a basic file transfer, but when I install it onto a computer, the server crashes for some reason. But it will work on some computers. Here is my code for the server:
I also have to make the program so that the client can click a button and then it will play a preset audio file. (example: User clicks button to play a fire drill)So to sum it all up, The server app goes onto the computer that will be playing the audio and the client app allows you to send audio files to it and play
[Code]...
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