I am fairly new to programming and I am completing the Step by Step by Microsoft for Visual Basic 2008, but I am not finding anything in the book about binding keystrokes for a program. I want to add the Number Pad into my Calculator Program so that every keystroke on it would correspond to a button in my program but I am unsure how to do this take.
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I need to do a programme that checks if the number a user enters is odd or even and then adds together all the odd numbers and all the even numbers seperately and displays the total in a label. My code just displays "0".
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim oddNumber As Integer
[code].....
I am making a calculator. I need a button that functions like a Backspace-button on a calculator. Erase the last inserted char, or what ever may work.
I use:
Button1
TextBox1
I am trying to learn how to use the modulus operator.this excersise is a change calculator and is supposed to calculate the number of dollars , qtrs, dimes, nickels and pennies from the change that is calculated.
in the form if i put a value in for owed = 30.00 and paid 34.25 my dollars returned = 4 and that is correct but the number of qtrs = 0 and should be 1. I am not sure how to correctly use this - any assistance you can provide is great - this is purely educational
Private Sub btnCalc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalc.Click
Dim owed As Decimal
Dim paid As Decimal
Dim change As Decimal
[Code]...
I'm new to the forum and new to programming with Visual Basic Express 2010.I would like to built a special calculator.Calculator will fall in number in the link provided on the website.
[Code]...
Im working on writing a program for doing standard deviation and as of right now im running into one slight issue with subtracting my mean from the original numbers. I will post most of my code so you can get an over view but i mostly just want help on this one little part for now. Im going to be making a website for school and put some programming stuff on it so i wanted to make just some random programs for it so this is school related but not really homework. It's line 26 and 27 that this is relating to. When i put a stop in my code and look at the result of arrayDifferences it gives me 0.0 when it should be -1. I know i can go this route and say arrayDifferences(1) = arrayDifferences(1) - arrayAvg but seeing as how i want this to be a random number of numbers input by the user i cant do that.
CODE:
adding all the numbers in a list box then multiplying it by a %.theres one listbox and two buttons, and two textboxes.i've completed everything but this and can't fibd it in my book. I just looking for pointers. this is what i have which i know isn't right
Dim sum, cost As Double
sum =
cost = sum * 0.06
lstbox.Items.Clear()
lstbox.Items.Add("Total Commission =" & cost & ".")
I'm currently working on a project where I want to ensure a user does not create a new record based on an ID (such as Customer ID) that already exists.If the record does exist, don;t create the new record and simply move the bidning source to the existing record and display that.What I'm currently doing within the Binding Navigator Add New Click event is checking if there is current data to save and prompting the user if they wish to save the changes before doing anything else.I then set a boolean variable called _NewRecord to true. Then within the lost focus event of the record ID, I have the following code:
Dim itemFound = -1
If _NewRecord Then
itemFound = GroupExists(txtGroupID.Text)[code]....
The code above works well, but I was thinking of doing this using the AddingNew event of the binding source instead to check for an existing record and simply cancel the new record addition then move to the existing record. However, I couldn't find any good examples of how I might do that or how to properly use the AddingNew event.good example of using the AddingNew Method as it looks like it might be useful to know for future projects.
VS 2010 Adding whole numbers between a number and a number
View 3 RepliesI am binding a datasource to a datarepeater. It works lovely (I am a huge fan of the repeater...) - Anyway - the only thing is that I want to know the number of the row that I am currently on. It isn't like a for loop where I can just count... Hmm? Here is a bit of code maybe you an see what I want to do.
HTML
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DataRowView drv = (DataRowView)e.Item.DataItem;
[code]....
Notice at the end of the line where I am trying to set listingCount - I can't seem to figure out how to update searchResultCount?
I have a datagridview bound to a datatable. I want replace one of the cells with a combo box and bind that combobox to one of the columns in the datatable. I have been able to replace the cell OK but currently have two issues I have not been able to resolve.
1. When I add items to the drop down (items.add ("Yes")...) they don't appear in the drop down box.
2. I can't figure out the syntax to bind a particular column in my datatable to the newColumn(combobox) in the datagridview.
dbConnection = New OleDbConnection
cmdCommand = New OleDbCommand
Try
[Code].....
how to add a save feature to the Binding Navigator tool strip as it isn't a feature by default. I'm using VB Express Edition 2008.
View 1 RepliesI need to have multiple lines in a cell, so I use DataGridViewTextBoxColumn.DefaultCellStyle.WrapMode =DataGridViewTriState.True. I add columns (datagridviewtextboxcolumn) in designer. Then bound datagridview to a table which has exact the same columns as datagridview. Then I find that datagridview has duplicate columns: the first column is empty (which I guess is added through designer), the second column is filled with data from table. My question is how to correctly allow multi-lines and bound to a table at the same time?
In Designer
Friend WithEvents DGV As New System.Windows.Forms.DataGridView
Friend WithEvents columnClient As System.Windows.Forms.DataGridViewTextBoxColumn
Friend WithEvents columnAccount As System.Windows.Forms.DataGridViewTextBoxColumn
Me.DGV.Columns.AddRange(New System.Windows.Forms.DataGridViewColumn()
[Code].....
You need to design and create a program that accepts input of employee name, employee type, and the number of hours worked each week for two weeks.
You must be able to select an employee type. An employee of type Trainee makes $10 per hour. An employee of type Regular makes $15 per hour. An employee of type Manager makes $20 per hour.
The program should calculate the employee pay for the week. The employee should receive 1 times the regular pay for any hours worked over the prescribed 40 hours in a week. The program should output the following information:
-The employees name without trailing or leading spaces
-Regular hours worked
-Regular pay
-Overtime hours worked
-Overtime pay
-Total pay
The Problem that i am having right now is "Displaying " the overtime hours on my "FORM VIEW" i mean i did the math right its just when i type (lblOverHrs.Text = CDec(CDec(OvrHrsWrkWeek1.Text) + CDec(txtOvrHrsWrkWeek2.Text))
Its says the "OvrHrsWrkWeek1 and 2" are not Declared which are..im not really sure where i went wrong..
Heres my code
CODE:
the code that send keystroke to another app by vb.net
View 8 RepliesThe feature I'm trying to implement allows the user to press the down-arrow key and "tab" through different features on the form. Is there a way to use the keyPressEventArgs or something similar to catch that? Is it necessary to delve into hooks and processes? And if so, does anyone know a good resource for a beginner?
View 3 RepliesI'm having problem with keystroke detection, I want to detect only "enter" and "I" keystroke.If you press "enter", it will automatically close the form the datagridview located and send data to other form, I'm using keydown function, but I don't know how to detect only "enter" and "I" keystroke, usually I'm browsing datagrid with tab button, but when I press tab, it also closed down.
[Code]...
I need to stop the keystroke event when I pressed a particular key. E.g.: If press alt+tab key then that keys should not perform that operation, that should operation should be stopped. I captured that particular keystroke, but I want to know how to stop that particular operation.
View 1 RepliesI'm trying to send a keystroke to a window (of an external executable) but am having problems.
If I launch the exe with a window I can successfully send it a "q" (in order to make it exit) using the follow:
1) AppActivate and SendKeys
2) SendMessage API using WM_KEYDOWN and WM_KEYUP
3) AppActivate and keybd_event or SetForegroundWindow and keybd_event
However, if I launch it without a window, obviously method 1) does not work as SendKeys only work on applications with visible windows, but I thought that method 2) would work. However, it doesn't. Also, using method 3) with SetForegroundWindow as this seems to only work with visible windows, which is not really a surprise I guess, given the name.
Another method I have tried, which won't work is using the RedirectStandardInput - I have this working correctly, but the application is looking for keyboard events, not writes to its StandardInput stream, so this doesn't have any effect.
Finally, I have tried using SendMessage and FindWindowEx, and TranslateMessage, to find any child windows or controls that should be receiving the messages, rather than the main window. However, no child windows or controls are found, and I wouldn't have thought this would be the solution given that, if the window is present, the main window receives the message as it should.
So, I have confirmed that the messages are going to the correct window, as they arrive as they should when the application is launched with a window, but I cannot get the application to receive the message when it is window-less. The solution doesn't have to involve messages, or even be particularly robust, but this is what I have tried so far (all the obvious stuff!)
is there something wrong with this? its not sending the key
Dim inputEvents As New USER32.INPUT
inputEvents.ki.wVk = Convert.ToInt16(key)
inputEvents.ki.wScan = 0
inputEvents.ki.time = 0
inputEvents.ki.dwExtraInfo = IntPtr.Zero
[Code]...
Using VB.NetWhen i add a the number with zeros means, it is showing exact result without zero'sFor Example
Dim a, b, c as int32
a = 001
b = 5
[code].....
I have list of number to add, the fomate of how the number are listed a bit tricky. thats what I mean:
[Code]....
Problem: Form hasn't fully initialize but shortcut keys can be usedDetails: Launch an mdi child with database access retrieving data, and user is already using the shortcut keys while the data is still been retrieve which results to error since object hasn't fully initialize yet.
Goal: Hinder user from using shortcut keys by disabling the keys at initialization then enabling it after all objects are good to go.
Another Situation is:A form with a gridview and a button.I got a hotkey that when press, handles a gridview getfocus event.
The problem is that the gridview is still making its instance and when press the hotkey, it activates the getfocus property of that gridview(which is still creating its instance).
I've got a very simple screen saver program that displays alot of stuff in pictureboxes and labels...dynamic display. I want to end the program on any keystroke or mouse movement. I've placed the statement "me.close()" in Public Sub Form1_KeyDown routine (Form1/Events). Nothing happens when I type though. I've seached the forums.....keypreview is true....
View 1 RepliesI'm trying to send a single keystroke to an application that has no window (because I have launched it with StartInfo.CreateNoWindow = True) and therefore I can't use SendKeys. I had a look at SendMessage but this doesn't seem to be quite right as the programme I'm sending it to doesn't process message queues.I would usually use the StartInfo.RedirectStandardInput property and send it via a StreamWriter but this doesn't not work as the application it is being sent to is looking for actual keyboard keystrokes, rather than pulling info from StandardInput (an old C++ programme using getch). Anyone have any ideas how to send a keystoke to an application with no window (FYI I don't need anything back from it, I don't need to wait until it's processed, and I only need to send one letter and no carriage returns or linefeeds, though these wouldn't hurt)
View 1 Repliesi am trying to send keystroke using sendinput but it doesnt seem to be sending. I have sendInput declared in user32 class with the input type
dim key as Keys = Keys.A
Dim inputEvents As New USER32.INPUT
inputEvents.ki.wVk = Convert.ToInt16(key)
[code]....
am i setting the flags wrong to send a key? not 0 then a 2?
This sounds like the stupidest question ever!!! BUT what is the code for adding a number to a label with the label's value being calculated dependent on user input?! So you choose 2 numbers to multiply, If a box is ticked then you add 10 to the label. I've got everything else I just can't work out the structure/code for this little bit.
View 1 Repliesi need to add the number in textbox 1 to textbox2 and mutiply the result times .10, if the result is grater than or equal to 2000 i need to add 12 other wise i need to add 10 heres my code
Dim total double
total = Val(txtbox1.Text) + Val(txtbox2.Text) * 0.10
If total >= 2000 Then
[Code]....
I have a fixed percentage 0.3% I need to multiply this by a number of months which varies 1 to 12
Having done this I need to add the percentage to a pre-determined number
so as an example
£300 + (0.3 * 10)
I can get the 3% (0.3 * 10)
But when I add this to the existing number (£300) it equals £303 not £309 which is what it should equal.
Can anyone advise the way of adding a percentage as appose to just another number? This also need to allow for -percentages i.e. -3%
The equation I am using is below and I appreciate there is nothing to set decTotalPercentage as an actual percentage but that's because I am stumped...
decTotalPercentage = decPercentage * intMonths
decFinalPercentage = decMoney + decTotalPercentage
I was curious if there is an easy way, besides making a new custom DataGridViewColumn, that on each keystroke validation is done (while the D.G.V.TextBoxCell is being edited), instead of when focus is lost off the cell.Or in a different senerio, if there is a way to restrict user keystrokes while a D.G.V.TextBox Cell is being edited, while not relying on making a new custom DataGridViewColumn. I would go through the work of implementing this new Column, except the customer for the job I am working at wants small, managable code. And even if this is a useful feature, they would want to avoid having an extra class being made.
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