[VB2008] Plugin Data Handling
Jun 30, 2009
I am working on an application with plugins. I have created the plugin host and the plugin, now I need to figure out how to pass data back to the main application from the plugin. IE: I have MainApp that has plugins in a subfolder. It loads the plugins and shows a menu item the launches the plugin. When the plugin launches it opens a windows form inside the plugin. The form does some calculations and then returns data in a string array. How do I pass that string array back to the main application?
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Nov 5, 2009
I need to write an app that that will iterate over our database, and perform various anaylsis on each record. In order to do this (partially for the learning exercise in creating plugin support) I want to use a Plugin model.
Currently, I have a simple Interface in my main app, which plugins can Implement. My app then loads all DLL's in a folder looking for ones implementing the Interface.
As you can see in the pseudo-code below, I have to keep performing a loop through all loaded plugins calling the process methods.
Sub ProcessData()
For Each Record In MyDataSet
For Each Plugin In MyPluginCollection
[Code].....
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Sep 20, 2010
ve been exploring with IThumbnailProvider in VB10. The first attempt I made was to handle MKV file thumbnails. I made the library and everything looked OK when I tested it against MS's Thumbnail app that came in the Windows API pack. Then I attempted to implement it on my computer, and every single thumbnail in the OS broke. Not a single thumbnail was generated by the system. So, after a bunch of trying to rescue thumbnails, I reformatted, reinstalled Windows, and got everything back to normal.
Today, I tried again. This time, using BLP files which are often used in Blizzard games (Warcraft III in particular). To avoid the same issue, I threw the compiled result into a Virtual Machine and tested it there, and it looked lovely. After a bit of experimenting and tweaking, I got it exactly as I wanted, cleaned the thumbnail cache, tested it one last time, and then installed it on my actual PC. Bam, all thumbnail generation is broken again.
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Nov 10, 2009
I'm currently working on a project where I am transmitting data from a comm device via the serial port and resorting the raw data (in binary) to its respective ascii values. The problem I'm facing is determining the most efficient method to accomplish my goal. Essentially, I have 68 bytes coming in, the first and second bytes represent the page and packet number and the data itself ranges from 3 to 64, the remaining for my checksum.
What I am needing to do is, grab 50 consecutive bytes per variable in my array, and that is where I'm confused. I have easily pulled my 3-64 bytes and stored that data to a string. I just don't know the most efficient method to accomplish my goal. Should I write directly to file all my data, as there are like 8 pages, of 128 packet data. [Code] I can capture the the first 50 by using a for-loop easily, but what would be the preferred method to track what data chunk I've taken? The more I think about it, I think I may just want to write to file, all my data, and then just take them back to back in 50 byte chunks. Is that the most efficient method?
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Mar 27, 2012
I am writing an application in vb 2010. The design of a program should be work in this way. Let's take an example.
ROW TYPE
1 APPLE
2 Orange
3 Grape.
Currently, i have a column named 'row' to control the display order for each item. i will sort the 'row' colum in order to display the record in the order when there were saved.I would like to find out is there any better way to achieve this? can i use the timestamp column in MS SQL?
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Aug 13, 2009
Iam having major difficulties handling a binary stream which I am trying to read and process in vb.net. The stream is coming in from an FTDI chip and should contain 64 8-bit values.An example of the stream is here
����������������������������������������� ����������ٶ��������
I need to get this into something that I can read (decimal or hex or 1s and 0s) in vb and I just don't know what to do - I tried using Asc() but it wasn't working and I know now that it can't work with characters higher than 127.
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Apr 29, 2010
I'm writing a simple application - address book. User enters new addresses and they are added as an entry to a list visible on the main form (frmStart). I use one form to add and edit (AddContForm). Add button on the frmStart works fine, however I experience some problems with the edit button as when I press it and enter new data they are added as new entry however the previous entry is still there. Logic is handled by Contact.vb class.
Contact.vb
Public Class Contact
Public Contact As String
Public Title As String
[code]....
Update:I really don't care much for whether the data on the AddForm is the old data or the new data. I think the problem now is that when I click edit previous entry on the list is not deleted (what I believe I have indicated in my question) - I tried to delete it (by using the if condition and checking what button was pressed) however it seems it is not working properly for some reason.
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Apr 23, 2011
I am currently creating a Windows App for a handheld device (WM 6.0, CF 2.0, sqlce 3.5) that pulls data from the server only when connected to a dock (all the significant data is maintained/altered on the handheld til it comes back and is docked for a sync with server).The data is similiar something UPS would do in that it manages pickups and dropoffs of items from a location to a location and records the time these "transactions" occurInitially, the handheld has a couple source tables (pickups and dropoffs) and some validation tables. During a given pickup or dropoff, I am trying to figure out the best way to move the data along this multistep process
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Nov 12, 2010
i am coding in vb2008 express.Can u suggest me any tutorial or sample code for "Handling Data between multiple forms".
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Jun 8, 2011
I`m trying to write a programme ,in VB2008 Express, to receive Serial Port Ascii data ( from a Multimeter) and display it as Hex Data in a textbox. I can get the Ascii data to show, but just cannot convert it into Hex. Once I can do this I want to write a new front end for the Mulimeter software.
This is what i`ve written so far :
Imports System
Imports System.IO.Ports
Imports System.Text
[Code].....
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Oct 9, 2011
I'm using VB2008 with MS Access Database.I make connection with DB by using the automatically way (by add a new data source ....)I create the Sql in "SELECT id, na, num FROM Table1" by add query to Table1TableAdapter, and add this code in form to call the sql :
Me.Table1TableAdapter.Fill(Me.AcddDataSet.Table1)
And it succeed with me
I tried same way with insert data to DB like this
[code].....
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Mar 11, 2010
I need to know who to write data from several text boxes on a form to a sql database.I have created the sql database on a localhost using myphp admin, i have created the connection in a module named as dbconnect()i can try the connection and this connects fine, but unsure how to write the data from the texboxes to the database.
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Dec 1, 2009
So, I have a little issue.. I can't currently explain it using the software I'm developing because it's "internal"... So I'm going to describe it as an email serverAnd the email server has a fair number of email accounts, and I want to save the accounts emailFor development, I've been saving it all in a list of a structure (this sounds worse than it is, the data actually is no more than 120 bytes per "email")
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Aug 6, 2009
How do you handle the screnario wherein multiple data entry forms are open and modifying one could potentially affect the record being modified in other forms?
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May 28, 2009
What are good things to check for, with respect to error-handling, when you are dealing with the data-access-layer? For example, let's assume I have this function..
Public Function UserExists(ByVal userName As String) As DataTable
Dim dt As Object = Nothing
Dim arSqlParameters(0) As SqlParameter
[code]....
How would you go about ensuring that your code elegantly handles anything unexpected in a situation like this?
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May 3, 2010
webbrowser1.document.All.Item(f_id).InnerText = f_data
f_id (input field id) , f_data (set data)
it can work
but
f_data=webbrowser1.document.All.Item(f_id).InnerText
f_data cannot get anything?
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Mar 17, 2010
when i push the button in VB, it can control other hardware which connected to serial port..
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Sep 10, 2010
This is a follow on from my previous thread in which .[URL]
in brief i have the following XML string which contains many hundered users, i have shortened it for posting
<?xml version="1.0" encoding="utf-8" ?>
<string xmlns="http://tempuri.org/">
<users>
[Code]....
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Mar 14, 2010
I would like to build a base class for my SQL Data Access Layer. I have most of it based out, but have a question about how to handle errors within the base class. I have a method for ExecuteNonQuery, ExecuteReader, ect...
[Code]...
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Jun 21, 2010
I'mvery new to VB2008 and have basically no idea regarding much of coding. I have attached a copy of my form. Basically, I have a db named "employee.mdb" with table "Employee". It has 3 fields Name, Dept and Designation. I want to connect my db with the form and want the following functions (when the respective buttons are clicked)Add: Add a new record to the db and save it without overwriting an existing record.Delete: Delete the selected record from the dbSave: Save all details<<: Move to the previous record>>: Move to the next record. I hope I have explained myself clearly
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Jan 5, 2011
I have two tables in one to many relationship in an access 2003 database.I am using vb6 and visual studio 2008.I want a data entry form (in grid view) for child table. I want to display & add, Update, delete child records accordingly with parent.
i.e. What I require is One combo box displaying a parent field and corresponding child entries will be shown in grid view. Data entry form for parent table may be on separate form.Is there a full sample source code for above mentioned theme.
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Sep 16, 2010
Does anyone have a list of OleDBTypes and how they match up with MS Access and SQL Server Data types. I would like this to be able to better write code for my parameter collections. Plus when looking at all the options availible with intellisense when programming in vb2008 v.s. SQL datatypes, there are some not so obvious choices.Here is the list I get from VB2008 using Intellisense:
OleDb.OleDbType.BigInt
OleDb.OleDbType.Binary
OleDb.OleDbType.Boolean
[code]....
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Apr 11, 2010
When i run the program everything works fine. I want the textboxes to keep the data in them till the next time i run it. Right now when i shut it down (with data in the textboxes) then start it up i have lost all the data.
Heres my code
Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress
'Numeric values only
If Not Char.IsNumber(e.KeyChar) And Not e.KeyChar = Chr(Keys.Delete) And Not e.KeyChar = Chr
[code]...
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Jun 23, 2010
I used this code in vb2008 to search or retreive data depends on calender the question is is that code true and it gives me error when i click in button under that line in yellow the msg "Keyword not supported: 'provider'."
Dim sql As String
Dim conn As New OleDb.OleDbConnection
conn.ConnectionString = "provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\user\Ayman\Desktop\lama\ayman project\totalsp.accdb"
sql = "SELECT * from total"
[Code]...
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Oct 26, 2011
VB2008 with MS Access Database updated related data ?
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Mar 11, 2010
what the results I need in a Windows Form Application.
Requirement:
(1) I need to create class objects with all various methods and properties, etc.
(2) I will create only one instance of the each class
(3) I need to be able to call the methods and properties of the created class objects (1) from any form I create.
(4) I use the class objects to store data so that separate threads can access them..
Question: how I would code this into a WFA? (I have console application code that works but need to convert it into a GUI).
[Code]....
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May 7, 2009
I need to consume data from a webservice. I am receiving xml data and using this to create objects through property setters.
In one particular case, an attribute of the object (called "is_active" and indicates whether the object is active or inactive in the application) is represented sometimes by
<field type="BooleanField" name="is_active">1</field>
and at other times by <field type="BooleanField" name="is_active">True</field>
The client code requires me to represent this using integers 1 and 0. The returned string "True" or "False" results in System.FormatException, as expected.
What is the most graceful way to deal with this situation?
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Oct 6, 2011
I have a delete button in a datagridview. The button works fine however when there is nothing to delete it throws an index out of range exception. Now I know for a fact people are going to click that button even though there is nothing the I am presuming the best course of action is going to be a try/catch but I am not sure how to do it. My code is as follows,
Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
If e.ColumnIndex <> 7 Then
[code].....
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Jan 16, 2010
I'm trying to retrieve data from an Access database - a simple one. (Just a single table with one column) My task is to view these records through a 'ListView'. No need to manipulate or anything. Just to retrieve data with a simple SQL statement and display via a ListView.
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Jun 22, 2010
I have an Excel based algo-trading app that needs to take in lots of real-time data, and make trading decisions based on the calculations driven by the data. It is not one of those "read-only" stock ticker kinda spreadsheets.I created a COM object with VB.NET that runs in its own thread space which collects data from a socket, and when the data is read it raises an Event with data attached. In Excel VBA, the event handler parses the data, puts them to the right places on the spreadsheet to feed calculations (so far it sounds like a stock ticker app), and then, based on the results of the various calculations it does something.The problem is that when the user starts to click around the spreadsheet while there is large amount of data coming, the event handler's cell updating breaks apart. If the app is left alone without user action, it stands well. My frustration comes from not understanding what happens to the main thread when a user clicks around. Either the event handler blocks the user action, or the user action blocks the event handler (under which case I will put in some queuing facility). But I just don't see how user action can break the code (like causing VBA to stop executing)
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