VB, Integer, Uinteger, And ARGB Colour Values?
Jul 21, 2010
Why is it that in parts of the .Net architecture that ARGB colours are expected be as type Integer when ARGB is outside the range of Integer? (ARGB requires 32 bits of precission, but Int has 31 bits of precission).Now of course I could just do a conversion, but what freaking conversion to use??? (I'm not affluent with all the VB global methods and the sort)
I've tried things like:
Code:
Dim value As Integer = &H80000014
Dim uvalue As UInteger = CType(value, value)
''overflow others include Convert.ToUInt32 -> value was either to large or to small and a few others all offering up nonsense about overflows, when all I freakin' want is a colour that Microsoft's own engineers have done stupid things like expect Integer values in places where UInteger should be, or vice versa. How about some consistency...
Code:
Dim value As UInteger = &H80000014 ''<- not represntable as a Uinteger???
Dim uvalue As UInteger = 2147483668 ''<- same value in decimal, same exact value! and it works this says it's not representable as a UInteger?
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Nov 7, 2009
if there is no need for my variable to store negative values, is it more efficient to use UInteger instead of Integer? both are 4bytes and i've got a feeling unsigned works faster though i'm nt sure about it. note that the range of my variable is 0 to 2147483647, hence i could use a UInt32 or Int32 and both would give me the same result so i'm wondering about optimum performance.
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Apr 3, 2009
how to get the Red, Green and Blue values from a specific colour. I have a Label, and the user can set the backcolor property. I would like to extract the Red, Green and Blue values from the users chosen colour.
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Apr 5, 2009
I'm trying to set an Integer value from my.settings.The values comes frpm a listbox, and then inserted to settings (set to specialized.StringCollection)The problem is when i'm trying to get the values and apply them to my function.Error code: Conversion from string "65 & 71" to type 'Integer' is not valid.To me it looks right, but maybe i'm missing something.
Code: Dim test2 As Integer Dim test As System.Windows.Forms.Keysm trigglist As New StringBuilderor Each item As String In
[code].....
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Sep 22, 2011
In the following code I have two class scoped variables intCompanyID and intEmployeeID. When I set them to a value in btnFetch_Click then try to read them later in btnSubmit_Click they are set to zero.
Option Explicit On
Imports MySql.Data.MySqlClient
Imports System.Data
[code]....
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Jan 2, 2009
cast integer values to an array of enum values?
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May 7, 2010
Is there any way to change the colour (background colour or text colour) of just a certain item or item(s)?
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Mar 15, 2012
To .NET after getting tired of using VB6 due to the lack of functionality. I'm trying to create a log on method for a system which will involve users selecting a colour from a paint panel and then placing/drawing the colour in 1 or more tiles of a grid, basically a 3x3 grid in which for example they selected the blue colour and drew in the top left tile and the bottom left tile. The logon is selecting the correct colour and placing the colour in the appropriate tile. What i want them to be able to do is place even a single pixel of colour so it has a high accuracy. So far i have a timer which loops from the width of the grid to the height of the grid.
Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
Dim BMP As New Drawing.Bitmap(1, 1)
Dim GFX As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(BMP)
GFX.CopyFromScreen(New Drawing.Point(MousePosition.X, MousePosition.Y), _
[CODE]...
To start with i have just hard coded the colour i want it to detect. At present it produces an error. Parameter must be positive and < Width the error is on System.Drawing.Point(i,j). If i place the mouse over the colour then run the program it will say it has been found, but otherwise it wont find the colour. I believe i am not updating the location of the pixel or something to that effect.
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Nov 30, 2011
I've got a combobox which loads the system colour list, the selected colour is stored in the registry (i've tried storing the index number value aswell as the colour name - how can i get the combobox to display the stored colour as the default colour when the form loads? It always defaults to the first item in the colour list I've tried
[Code]....
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Apr 8, 2009
So I have got a program with a timer on, a few labels displaying coordinates, and two buttons. Here is my
[code]...
It displays the color of the pixel at the coordinate typed into the text boxes.I have a video of a tennis ball which is bouncing on the spot, and the background in brown, so when the tennis ball comes into view there is a significant color change and i want it to start and stop a timer each time the colour changes significantly.So my question is, how do i get it to check whether the colour chas changed significantly?
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Apr 8, 2010
My VB2010 programme changes the background colour of a button (butExtra.BackColor = Color.Red). But how do I restore the colour to the default "Control" colour?
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May 30, 2011
i am looking to change the windows colour and colour intensity. These settings are accessable through Control PanelAppearance and PersonalizationPersonalizationWindow Color and Appearance But is there a way that i can remotely change these two settings through functions in my windows form application? Also is there any way of removing the slight blur on the window bars/taskbar when using an aero theme?
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Sep 16, 2009
I'd like to replace all the white pixels in a bitmap image with pixels of the colour "Color.FromKnownColor(KnownColor.MenuHighlight)". Is there some method in the Image, Bitmap or Graphics classes I can use, or will I simply have to inspect each pixel in the image with GetPixel, check whether it is a white pixel, and then set it with SetPixel?Here is the code I am using now:
Private Shared Sub highlight(ByVal b As Bitmap)
Dim highlightColour As Color = Color.FromKnownColor(KnownColor.MenuHighlight)
Dim whiteARGB As Long = Color.White.ToArgb
[code]......
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Jan 13, 2011
I'm working on a simple BlackJack (player vs dealer) system, that I plan on making gradually more advanced. However, while everything works brilliant, I'm yet to find a logical solution to declaring an Ace as both 1 and 11.So my question is, how do I pull this off. Below is the "New Game" logic (code) so it should give you an idea of what I'm working with (note how player scores are added together, I'm sure it's easy enough to understand...).I'd like lblPlayersum to still be a usable integer, though I'll rework everything if noone has a logical solution.Just quickly note that the "Cards" array is purely used to coordinate images."CardsVal" coordinates that values within the deck. Arrays 48, 49, 50 and 51 are the aces. (Currently defaulted to 11).[code]
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Mar 12, 2011
I have a question, that is: What is the easiest way to get Integer values from a file.The file is structured like this: (Without the text)10...How many values are in the file 1 2 3 4 5 6 7 8 9 10..The values...I know how to do it, the hard way, but I need an easier way, to teach a friend the basics of Vb.net.
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Feb 9, 2010
Ok, i've been making my own syntax highlighter for my project, and i need to know how to make the colour of the text between these two text values green
[Code]...
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Jan 7, 2010
Here is some code I am trying to use to read a UShort and UInteger from a filestream[code]...
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Jan 9, 2011
Im using VBStudio 2010 Pro and I am writing to the registry the Font and Background colors so that my form load will apply the chosen colors. Can't get it to work for me though.
Am setting like this:
ColorDialog.ShowDialog()
My.Computer.Registry.SetValue("HKEY_CURRENT_USERBMSUFontColor", "FontColor",
[code].....
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Dec 31, 2008
I'd like to know how to convert argb to rgb
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Nov 29, 2010
I have a hexadecimal value contained in a string in the format like #FF00 for red, #0FF0 for green and #00FF for blue. I remove the hash sign so it's just the hexadecimal number but after that, I'm stuck? I know there's a convert.tostring or something but I'm not sure how to use it when converting from hex to decimal.[code]How do you do the reverse of this? From Hexadecimal to Decimal so I can create the argb value of my brush colour. If there is an easier way, please say but, as far as I am aware, Visual Basic.net 2010 doesn't let you define a colour using #0FF0.
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Feb 11, 2010
1: Start with bitmap in picturebox colored white2: Draw a filled rectangle (50,50,100, 100) Color black - ARGB (255,0,0,0)3: Draw a filled rectangle covering black rectangle (25,25,150, 150) Color blue, with Alpha set to 100 - ARGB (100,0,0,255) -because of 100 Alpha setting the black rectangle is visible through the blue rectangleProblem : Using bitmap.GetPixel on the blue rectangle (over white background) the result is ARGB(255,155,155,255) -an Alpha value of 255. The new color loooks the same but is not transparent.Question: How to find Alpha(transparency) value of pixel
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Dec 14, 2009
Q1. is there a way to set an argb value to a Control?
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.AllowTransparency = True
Me.BackColor = Color.FromArgb(155, 255, 0, 0)
End Sub
i get error when setting BackColor "control does not support tarnsparent background colors"
Q2. is there any difference between this 2:
argb(255,0,0,127) "opacity is 1, blue is half" and
argb(127,0,0,255) "opacity is half, blue is max"
Q3. what if there are rounding off errors in the conversion to/from argb/rgb say argb(200,0,0,150) when converted to 255 opacity i get (255,0,0,117.5585938~)can i say that argb(255,0,0,118) is exactly equal to argb(200,0,0,150) or is argb(255,0,0,117) exactly equal to argb(200,0,0,150), or is there no way to exactly convert argb(200,0,0,150) to a value with alpha at 255?
Q4. is it true that there is absolutely no relation between argb and rgb, because the actual rgb value of an argb depends on the color of the element behind it?
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Jul 26, 2010
I want get integer quotient when I divide two values. Per example
X=3
Y=2
Q=X/Y = 1.5 // I want get 1 from results
X=7
Y=2
Q=X/Y=3.5 //I want get only 3 from results
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May 1, 2012
My problem is that I have two forms, Form1 and Form2 ...on Form1 there is a TextBox called txtTotal (this contains the calculation of Ticket Prices, thus it's a numeric value) and on Form2 there is a TextBox called txtTotal2. All I want to do is get the same number that appears in txtTotal on Form1 to appear in txtTotal2 on Form2 .However whenever I try some of the help tips online such as using a declaring txtTotal as global or friend it dosn't work, and any other code iv tried attempts pass the textbox value as String which brings an error.
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Oct 17, 2011
It's good to be back in this forum again hoping someone could help me solve my problem again xD My goal is to import .txt to db.
This is my code
[code]...
Some of the records are inserted but when the code read the part where there is an empty/null value in the column where they are assigned as "decimal" the error message "Error converting data type nvarchar to numeric." pops out.
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Jun 23, 2009
I am trying to reset all integer values to "0" with a reset button.I try not to use hardcoding by simply set them one by one. So my idea was checking all the variable's type and set them all to "0".
I tried to use this methode, from someone in this forum (sorry, I forgot the name but this is very helpful...) For Each ctrl As Control In Me.GroupBox4.Controls 'Check and see if this control is a TextBox
If Object.ReferenceEquals(ctrl.GetType(), GetType(Label)) Then 'Check and make sure this s the "TextBoxToExclude"
'CType(ctrl, CheckBox).Checked = False
CType(ctrl, Label).BackColor = InactiveColor
End If
Next
But when I tried to find the code, I couldn't get it.So, if anyone knows how to do this,
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Apr 20, 2012
If I run the following code in C# then it runs fine
UInt32 a a = 0x9E3779B9
But when I run the same code in VB.Net then it gives me error "Constant expression not representable in type 'UInteger'"Dim a As UInt32 a = &H9E3779B9
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Oct 13, 2010
I am trying to assign a constant with this value:
Public Const FIRST As UInteger = (0UI - 860UI)
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Feb 25, 2010
How can I convert a Short Time to an Unsigned Integer?
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Mar 22, 2011
I am working with a future value application and I am trying to display the calculated future values in a listbox. For instance, I input the monthly investment, the yearly interest rate and the number of years into textboxes and I want the application to list out the future value for each year until the number of years in which I entered is reached. I cannot figure out how to get the code to display the value after each year. I am trying to use the "mod" operator to display the value each time the 12th month comes around.[code]...
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