VS 2010 Data Manipulation And Conversion?
Jan 18, 2012
I have eight text boxes each can have any numerical value only consisting of the numbers 1-8 up to eight digits each. No 0's or 9's. I am using a timer to loop through the sequences of text boxes at a given rate. This is already configured.
Now here's the hard part so bare with me.I need to output the first value of a text box, wait some time then output it's counter letter (below the number on the keyboard), go to the next text box and repeat. Example:
[Code]...
Ultimately I'm trying bring my PC Interface project up to date by going from a parallel port to USB. This will be the "Custom Loop" function for the device.
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Jan 19, 2012
I have eight text boxes each can have any numerical value only consisting of the numbers 1-8 up to eight digits each. No 0's or 9's.I am using a timer to loop through the sequences of text boxes at a given rate. This is already configured.Now here's the hard part so bare with me.I need to output the first value of a text box, wait some time then output it's counter letter (below the number on the keyboard), go to the next text box and repeat. Example:
1
34
765
[code].....
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Jun 15, 2010
I'm currently learning VB.net and can confidently connect to databases and return results to comboboxes run stored procedures ect to datagrids, However I'm wanting to find an online tutorial for doing loops with data so for example
I return the following data into a dataset
Orderno Orderitem Price GUID
111 Pies 1.50 xxx-xxxxx-xxxxx-xxxxxxx
111 orangutang 2.00 xxx-xxxxx-xxxxx-xxxxxxx
ect
I want to display each element on a page in a structured format so as to make a visual representation in seperate entities (labels maybe) of the data like so:
Order number
line 1 (includes item and price in plain text on a page i guess using a label)
line 2 (same goes)
Subtotal( )
The results and formulae i can do but it's simply how to split off the data from my dataset and display elements as seperates (also how will i dynamically create the lables as obviously i'm not going to know in advance how many order item rows will return )
Obviously this is not urgent but if anyone could point me at a tutorial or even better a few lines of code that will do this for the microsoft northwind data so i can mess about with it and play.
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Jul 15, 2011
Im getting that error in the da.Fill(ds)
Imports System.IO Imports System.Data.SqlClient
[Code]...
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Jul 28, 2009
I understand that there are several ways of Inserting, Updating and Deleting records in a database such as DataAdapters, DataSets, TableAdapters, SqlCommandBuilders, Parameterized SqlCommands, StoredProcedures, etc, etc,etc. According to David Sceppa Sprocs are the most preferred. Ok, I go with him on this one (who am I to challenge him anyway?).
My question is, apart from Sprocs, which of these options is the BEST for a large commercial database application and why, taking performance into account? What are the benefits and drawbacks of each option?
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Jun 10, 2010
I have a text file that has about 200 programs that were dumped from a cnc machine. I want to be able to take that text file and extract each program and save it as it's own text file. There is a distinct character at the beginning and the end of each individual program. I an new to vb and the projects that I have done to this date involve database front ends so i have no idea on how to work with text files.
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Apr 26, 2010
I have been using Dick Grier's example to attempt to attempt to read data coming from a project.I first have to read 16 bytes for an RFID tag. I have that working and am able to extract the unique ID code and display it (cut out for length).The project samples voltage on an ADC and transmits 120 samples ranging from 0 to 255.I am attempting to buffer in the 120 samples, convert the scaled voltages (195 Vp or so (115% of Vnom)), and calculate Vrms.When I attempt to calculate and display the information, nothing is displayed.[code]
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Jan 20, 2012
how can I transfer the value of textbox to a gridview or when I select a value of a gridview it will be transfer to another gridview.
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Nov 7, 2009
I am writing a program with VB.NET, there I have to select data from one table. Then I have to update about 4 tables and insert to 2 Tables. Which approach will be ok for me? I'm thinking to use DataSet.
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Jun 21, 2010
I have a process that does a lot of data manipulation and then prints a simple report directly to a printer. The overall priority is speed. Tens of thousands of records need to be scanned & processed individually so moving thru them quickly as possible is the goal.
Pseudo code
01)Scan Barcode
02)Fill DataSet from Sql Server
03)Manipulate data in dataset
04)Update data back to Sql Server
05)Print crystal report directly to printer; the dataset is the reports source
06)Clear dataset and start next record back at step one
The process if pretty complicated with a ton data manipulation and data coming from multiple sources but that part works super and in short all I am doing is scanning barcode, filling a dataset, passing it to a report and starting over. Steps 1 to 4 are averaging one tenth of a second (0.01) to complete; great. Passing it to the report to print takes several seconds which is the problem. I thought I would resolve this by passing the dataset to the report print sub - allowing the print sub to run on a background thread - and moving on to processing the next record.
Dim m_ds As MyTypedDataSet
Sub ScanBarCode
Fill DataSet
Validate & Manipulate Data
Call PrintReport
Clear Dataset
End Sub
I have been attempting to add the PrintReport sub to process on a background thread. The problem though is the main thread blows right by to the next step and clears the dataset; causing an error in the report sub. I've tried unsuccessfully just about everything I can think of; including using DataSet.Copy to local datasets (which I really don't want to keep recreating the same object over & over tens of thousands of times), as soon as the main dataset clears, all clear.
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Dec 15, 2011
[Code] i need a way to screen each employer status and mapping status before placing them in the DGV. I need to convert the numerical values to their corresponding status. 1 = Good, 2 = Non-Reporting, 3 = Under-Remitting and 4= Non-Remitting(which i already know how to do). I just don't know how to get the values being placed on the DGV. I would love to do this on oracle but i don't know how to.
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Dec 25, 2011
I need help to form a code for a small arrays manipulation. The input data are known: they are two integers "N" and "s". An integer "N" is always divisible by 4.I need to create an array of "N" members, by repeating (N/4 times) this sub-array: 1,2,2,1 (always is the same). In the picture, this is shown in blue. Then I need to add the same array to the existing array, but shifted for "s" places (red array). The result is "yes" if each sum in new columns is always the same (3). Otherwise the result is "no." note there is no need to draw or display something (DGV, table ...). The required result is only "yes" or "no".
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Feb 26, 2012
I have a list of .txt, .doc, .pdf on my listview. How do i code this problem;
1. When i double-click the item (sample.txt) on my listview it will open in a notepad.
2. When i double click the item (sample.docx or sample.doc) it will open the MS word and shows me the things written on the particular item.
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May 31, 2012
[Code]...
Then skips straight to the Else without performing the two lines in between, regardless of whether the item was checked or not checked. It doesn't crash, doesn't throw any errors, so I am assuming I coded this wrong somehow.
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Aug 1, 2009
I am working on an application that will need to read tons of records (close to 500,000) from one table and insert them into another set of tables in the same database. I though about using SSIS package for this but our DBAs don't want to use that. Now, I am thinking of a multi-threaded approach. I am thinking that I can have a few thread started that will read say (500) records at a time and insert them, then come back and read more.
Now, say I spawn off 3 threads of this application. The first thread reads 500 rows and starts processing them. Can I lock these rows that were already read so that the next thread does not pick them up? I am trying to find some articles regarding this on the internet, but perhaps I am not searching for the correct terms in Google.
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Feb 28, 2011
I have 3 textboxes in where RGB colors are added. Now I've added an extra for HEX color. When I tried to convert the 3 textboxses to HEX I found that the output is wrong. Seems I'm doing something wrong.
Dim conv2hex As String = System.Drawing.ColorTranslator.ToHtml(Color.FromArgb(color_map_txt_r.Text & color_map_txt_r.Text & color_map_txt_r.Text))
color_map_txt_hex.Text = conv2hex.Substring(1)
[code]...
The correct conversion would be: a90266, but the result is: 155111..
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Jun 15, 2012
Here's the function I'm a bit mystified by(Little rusty bitwise operators)
void two_one(unsigned char *in,int in_len,unsigned char *out)
{
unsigned char tmpc;
int i;
[CODE]...
I marked the two places that I don't quite understand. How to convert those pieces to Vb.Net.
Update: So this is what I came up with, but it's not quite giving me back the right data...Anything look wrong here?
Public Function TwoOne(ByVal inp As String) As String
Dim temp As New StringBuilder()
Dim tempc As Char
[code].......
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Oct 26, 2010
VB 2008 Express edition. I'm pretty new to VB2008, a little over halfway through my first classi am writing a console program to ask the user for the price of gas for 7 days, then to get the average of that price. here is my code so far:
Option Strict On
Module Module1
Sub Main()
[code].....
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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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Feb 2, 2011
I'm creating a simple personal calculator, it only has 1 textbox and 1 button.my code is:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
TextBox1.Text = Val(TextBox1.Text) * 6.2
End Sub
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Apr 24, 2012
I'm trying to convert some of my code from EXCEL VBA code to VB.net. However I've been encountering some errors and can't seem to get to display the output correctly.Below is my sample text data:
Date Time SYSID LPARBSY MVSBSY INRDYMX INRDYAVG INRDYQ(%) AVG_PROCS
---------- -------- ----- ------- ------ ------- -------- --------- ---------
03/18/2012 09.00.00 CP1A 11.97 12.03 3 1.1 99.0 2.0
03/18/2012 09.00.00 CP1B 8.86 9.12 3 1.1 99.3 2.0
[code].....
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May 7, 2009
I'm writing a C# application that reads data from an SQL database generated by VB6 code. The data is an array of Singles. I'm trying to convert them to a float[]
Below is the VB6 code that wrote the data in the database (cannot change this code):
Set fso = New FileSystemObject
strFilePath = "c: emp emp.tmp"
' Output the data to a temporary file
[Code]....
The problem here is the VB6 binary to string conversion. The VB6 string char is 2 bytes wide and I don't know how to transform this back to a binary format I can handle.
Below is a dump of the temp file that the VB6 code generates:
And here is the dump of the data as I read it from the database in (=the VB6 string):
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Jun 3, 2012
I am trying to retrieve and display data from MySQL database to vb.net console window using the following code
myconnection = New MySqlConnection("Server=localhost;username=root;password=;database=agro-system;")
myconnection.Open()
cmd1 = New MySqlCommand("select * from sales", myconnection)
myreader = cmd1.ExecuteReader()
While myreader.Read()
[Code] .....
But I get the following error:
Unable to convert MySQL date/time value to System.DateTime
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Oct 18, 2010
i m working on an application which communicates with PLC machine using Modbus protocol. Now i m able to generate and communicate a modbus data frame with PLC the only problem that i m facing is that in all the data frames of modbus the last ascii characters should be Carriage return + Line feed which should be read by the PLC as 0D 0A that is in Hexadecimal form. But i m not able to do this. The rest entire string is properly read by the PLC but How do I make it read the CR+LF.
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Mar 2, 2011
Just wondering what the preferred/practised data type conversion technique is?
For example I recently enabled option strict, which in turn found quite a few errors in relation to data types, vb.net prompted me to use CType, which is fine.
However, I have seen other functions for data type conversion, such as .tostring, CInt , Convert, integer.parse and also Ctype.
Why would you use Ctype over the others?
I know its a pretty primitive question , but why do so many conversion methods exist?
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Sep 2, 2010
I'm working on a form that allows to add new users to a users table in my Access database. The table only has 3 fields: user (string), password (string) and admin (boolean). user is the primary key. But when I run it and try to add, I get an error when casting the query to Double (?). I don't have any double variables or table fields, and I'm not trying to cast anything from or to double. So I have no clue about how to fix this. The code I'm using to insert (and it's working correctly on other forms and tables I have) is:
[Code]...
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Mar 10, 2012
as i learn VB 2010 express, i want to try some serial communication and i found this code for VB6..but i have no idea how to make it work in VB2010?
Private Sub Form_Load()
MSComm1.RThreshold = 44 'transfer data into VB program only after receiving 44 characters into buffer
MSComm1.InputLen = 0 'i think only for receive data & not for sending data ...check
MSComm1.CommPort = 1
[code]....
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May 13, 2010
I have been using this code for a long time now and it has always been accurate. I recently tried to convert a large string from one base to another and some weird stuff happens.
When I convert from base 36 to base 10, the result is accurate. When I convert the result back to base 36, it becomes inaccurate.
[Code]...
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Oct 17, 2011
I don't know how to convert the nvarchar value into an int, but that is the way it needs to be set up. I've found other posts about this but I don't know how to use CAST in the INSERT statement I have. All the posts I could find were about converting to int in SELECT statements. I need this statement to change the field @Duration to an int in the database. @Duration is an amount of time. (01:00, 02:00...) They will all get rounded up to the next int value. So if a user enters 0:45, it should be converted to 1. how to get this INSERT to work?
'SQL Insert: Product table
Dim sqlInsertProduct As String = "INSERT INTO Product (ProductName, Status,
CreateDate, ModifyDate, CreateUser,
[Code]....
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Mar 11, 2010
[code] My project topic is on data conversion for length and weight. There is something wrong with the code.
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