Backgroundworkers Do Not Properly Check The Images Against The Ones Stored In Program?
Aug 22, 2010
I am making a program that takes pictures of the webbrowser control on a set timer and save them in a picturebox.. I then use backgroundworkers to check the images against others stored in the program. My issue is, the backgroundworkers do not properly check the images against the ones I have stored in the program.Could this be because the images and picturebox are stored on the main thread, and no in a background worker?In other words, I am taking picture from my webbrowser and putting them in my picturebox. Then, I am comparing them with images already in the images. The only problem is, the workers are unable to properly compare the images.
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Apr 6, 2009
From this aspcode.net page at the bottom (under attachments) you can download the project.For some reason when I run it the Close Button and the Next and Previous Buttons don't work. Well I mean it does work but it does not show the actual images. Can anyone figure it out? It should be easy but I just cant get it to work.
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Jun 13, 2011
Need to design a program that can encrypt and decrypt messages stored in simple text files using a private key stored in a separate file. Software should also be able to allow the users to enter simple messages that either displays the encrypted or decrypted message. The encryption method should use a simple substitution method. It should be set out in the following format:
Example (the "@" is the separator):
@
The character The Code End of line
A @ 4gh EOL
B @ 84!9 EOL
Has to use the 256 ASCII character codes. The separator will be used to separate the character and its corresponding code.Here are the pseudocodes I have come up with:
� Read any private key file
separator = readline(file);
while not EOF(file) do
tempStr = readline(file);
[code].....
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Apr 29, 2010
I want to use images for my program that I believe are stored somewhere on my computer but I don't know where. I want something like how all excel files show the excel icon and all word files show the word icon etc.
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Aug 7, 2011
I have a database (mysql) to which I connect, I have a column in the database (the images) that I view as a grid that is in the datagridview autoimplementa. BUT THE IMAGES ARE STORED AS A URL.
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Nov 30, 2011
i need help in "retrieving/update" images using stored procedures in vb.net
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Apr 24, 2010
I have my requiremnt as follows. I have a database consisting of text, image columns. Now I would like to query the database and display the result on to a word document. I have that resultset in a dataset. Now I would like the result in paragraphs manner in word document.
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Dec 10, 2011
So I have an application that saves and retrieves images from an Access database. The images are displayed in a picturebox but I'm having a bad time figuring out how can I move to the next/previous record/image in the database, so the user can view them and delete it if he wants to...
Here is a screen of my form so you can better understand what I'm trying to do:
And here is the
Imports System.Data.OleDb
Public Class Form1
Dim dbConnection As New OleDbConnection
[Code]....
Save and delete functions work fine, I just need to know how to do the Next and Previous buttons... This should be easy to do, but I'm still a beginner to VB
Biggest problem is that this is a part of a school work which I must deliver tomorrow.
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Jul 30, 2010
how to properly connect to a MySQL database check if a login is valid.Basically i want someone to write me an example of how i connect to a MySQL database, check if username is correct, check if password is correct. If username and password is correct- it should return True as of boolean dim.
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Aug 19, 2010
how to properly connect to a MySQL database check if a login is valid.Basically i want someone to write me an example of how i connect to a MySQL database, check if username is correct, check if password is correct. If username and password is correct- it should return True as of boolean dim.Otherwise it should return false.
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Jan 11, 2009
I'm currently writing an application that is used to automate a certain task. Currently, it uses the threadpool (using up to 25 threads per the enduser's option). Each thread calls a function which will usually take about two minutes to finish, but it uses a While loop in order to repeat the process. This is my code to start the threads:
Private Sub ProcessAllItems()
For i As Integer = 1 To Me.numThreads.Value Step 1
Threading.ThreadPool.QueueUserWorkItem(New Threading.WaitCallback(AddressOf ProcessItem), i)
Next i
End Sub
The function "ProcessItem()" is the function that contains the While loop. The control "Me.numThreads" is a NumericUpDown control whose max value is set to 25. My question is...is this a good method to follow? To my knowledge after .NET Framework SP1 there is a max of 250 threads/CPU. However I've read the the threadpool is normally used for processing short-lived tasks. Should I be using background workers instead? If so, how could I start up to 25 background workers during runtime depending on the value of "Me.numThreads"?
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Jun 6, 2011
I am writing an automation program that runs 4 test boxes in line with a handler. Im having a problem with running 4 BGWs(back ground workers). The Program is running fine right now but its not running the way it was designed. What i am trying to do is get all 4 BGWs to run in parallel. what its doing right now is running 3 and then when those three are done running it runs the 4th. the crazy part is its not running 1 2 3 then 4 its running 1 2 4 and then 3. Also its not updating my status windows right either.
[Code]...
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Oct 2, 2009
I have a stored procedure that has a if statement in it. This if statement checks a count select. If it's greater than 0, it selects a set of data, if it's 0 then it selects a different set of data. The problem I have is in the vb code, I have been trying to check a value to see if it's there. If it is, then I add the value to a couple labels, otherwise I don't Here is the vb I have commented it so you can see what I mean.
Try
Dim lrd As SqlDataReader = selectCommand.ExecuteReader()
While lrd.Read()
[code].....
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Mar 15, 2011
I'm trying to develop an application which searches a sql server database. One particular search entered by the user actually sends seven queries to the database. I've designed it so each of the seven queries is conducted in a seperate backgroundworker, so that they run and return their hits concurrently. When the user enters a search term, a routine (runSearch) is called , which in turn causes each seperate backgroundworker to run.This work fine when the user enters a single search term.I'm now trying to allow the user to enter multiple search terms in a multiline textbox. I iterate through the lines in the textbox and call runsearch for each line. I assumed that the progam would wait for each call to runsearch to complete, before running the next.
I now find out this is not the case. When I call runSearch, the backgroundworkers are set in motion. The next line in the textbox then calls runSearch again, but the backgroundworkers from the previous calling of runSearch are still running. This throws up an error stating that the backgroundworker is still busy and cannot be called.I need a way to test that all of the backgroundworkers have completed before running runsearch again. If one or more of the backgroundworkers are still running
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Mar 24, 2009
I am making an application that has a tabbed interface. Each tab uses a UserControl with the controls that I need on it. The user enters some data & clicks a button, which starts a lengthy process. I would like to run that process in a BGW, so that the user can switch to (or open) another tab & process another set of data simultaneously.
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Jun 23, 2010
I have an array that is a list of files in a folder, I'm processing the files and renaming them. It takes about 15 minutes to rename them all, this is done daily. I currently have 1 Backgroundworker to handle this and update the UI.
My question is, this: How can I use more than 1 Backgroundworker to use more than 25% of the CPU to do this?
Split the array into 3 parts and call 3 separate workers to do their part?
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Nov 26, 2010
The code uses dynamically backgroundworkers which all workers great, but with one problem. If you were to look at line:
For Each folderPath In File.ReadAllLines("file path here")
You would see that it loops the text file, and starts background work.
The problem is that it does not list the files in order.
For example were you see "file path here" that were you put the file path.
The text file itself would look something like this:
C: est
C:VB
The program starts listing file from the C:est then goes back to C:VB then back to C:est.
I know the reason why, but I can't stop it. I tried pausing that code inside the loop, but with no luck. How would be able to list the files in order?
vb.net
Private filePaths As New List(Of String)
Private workers As New List(Of BackgroundWorker)
Private Sub GetAllFiles()
For Each folderPath In File.ReadAllLines("file path here")
Dim worker As New BackgroundWorker
[Code] .....
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May 19, 2010
im making a tile slide game and im stuck . im trying to find out if the images are in the right place. how would i check to see if the images are in there respective picture-boxes?
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Sep 20, 2010
I have a program where a lot of the required information for it is stored in text files. I simply read this information into large arrays. However, I don't think it's necessary to load all the information each time. Rather, it would be more efficient if I could simply search through a list of items to find the one I need and then use the data from it, or to find a similar name and use it elsewhere.
Would I be right in using a database? And is database programming done in SQL? I have a book on it telling me to use the SQL Server (IIRC), so I shouldn't be doing it in the VB.NET Express GUI?
Here's an example of what I would do:
Hex = 03 00 => dex number 003
Search in file Pokemon Dex Numbers
003 returns Bulbasaur
Check Bulbasaur base stats in the base stats file
etc
So basically I'm reusing a lot of information. I think a database would be best and it would all be internal right? I'm getting complaints about access denied to a text file (since it's stored in the program directory in the program files).
So to cap up the few questions I have:
-Databases are done in SQL and not inside the GUI?
-Databases would load internally?
-I could search a database without having to load it into like an array or something?
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Aug 26, 2009
How do I make a program that opens a file in the folder the program is stored?
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May 19, 2012
I am using a DataGrid, in VB, I have a check box. If it is checked I turn image.visible to true. This is done within the ItemDataBound method. How can I get it so when the check box status is changed, the DataGrid is rebound and uses the if statement to decide whether to show the images or not? [code]...
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Jun 10, 2011
I was trying to make a program which displays two chars A and B on the screen. Using the WASD keys, it lets you move the A char around and using the arrow keys it lets you move the B char around.
I wrote the following:
Module Module1
Dim Box_A(1), Box_B(1) As Byte
Dim Allow_Draw As Boolean
[Code].....
When I run the program, if I press any of the WASD or arrow keys the corresponding char doesn't move. To make it move, I have to hold down any of its keys for a bit after which I can move the char just by pressing its keys. But then, I have to do the same for the other char.
So, if I want to move B I have to hold any of the arrow keys for a bit. Then I can easily move B just by pressing any arrow key once. Then to move A I have to hold any of the WASD keys for a bit and then I can move A just by pressing any WASD key once.
Is there any way I make make each of the char move just by pressing its ket once?
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Feb 19, 2012
So I made this neat little clock program in smallbasic and i downloaded visual studio 2008/visual basic 2010 yada yada.I clicked on graduate, made a folder under my documents to dump the stuff, finished installing, and then opened the project in VB.The SmallBasicLibrary couldn't be found
Such components as the GraphicsWindow wasn't converted to VB or something (probably because the library wasn't found).I followed Microsoft's instructions but I don't know what happened.
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May 19, 2011
Check if park_id already exist in table calendar by stored procedure? [code]...
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Jan 17, 2012
While running an application in the IDE, the program properly handles Try/Catch/End Try blocks. This works fine for the most part, but is it possible to have errors generated in these blocks stop execution at the line with an error on encountering an error?
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Aug 23, 2009
I am building a windows program that I need to link to add and pull information from an access 2007 database. I really so not want to use SQL if at all possible.
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Apr 9, 2010
Details: I want to compare these above two table1 and 2 . The unmatched records should be save in a new table .
objectives
1 Should take input the table and fields we want to match each other.
2 Then after searching or reading the record from table and selected fields save the unmatch records in a new table
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Feb 15, 2012
i'm working on a project that is trying to calculate the discount on three different kind of packages, each worth different prices.
what we are given is
package A= $99
package B= $199
[code].....
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Jun 22, 2010
I am looking for a code snippet which opens a image, creates a clone of this bitmap in memory disposes this opened image so that all handles are closed.
Usually we can open a bitmap using this[code...]
the following code however keeps the Image File locked until the application is running, any suggestions how to dispose it properly. (So that no handle is left open )
Things i already tried: use dispose method of bitmap <= doesnt work (need to write implementation)
Using Block also doesnt work.
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Sep 11, 2011
I'm trying to make a program of mine into a multithreaded application, but I've hit a pair of snags that I documented in the following code. I can expand this stub into a more efficient version of my existing application.
[Code]...
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