Getpixel + Printwindow : Getting A Pixel From A Program That Is Not Focused?
Jul 21, 2009
what i have been trying to get to work is getting a pixel from a program that is not focused (so minimized). I tried Getpixel but only got it to work when the window is active(focus). It seems it only works for active window.Then i thought making a temperately screenshot of the program and get the pixel. I came across PrintWindow. Right now im searching to make a temperately screenshot of a minimized program and read the pixels of it. So far i had no success.
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Mar 13, 2009
Im trying to make a program that will automatically send a left mouse click on the current mouse position using a getpixel trigger. The one i made will wait for the pixel color to change and it will trigger the next timer to monitor if an indicator hits the middle of the bar.
This is the example of the bar waiting for a color change:
This is the example of the bar when the indicator comes out
[Code]...
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Jan 30, 2009
I would like to load a GIF file, and start with the first pixel and check to see if that pixel color is closer to Black, Red, Green or Yellow, then take what ever color it closest matched to and output that color as a number, 0, 1, 2 or 3. So just for a small example a 5x4 GIF would be converted to something like this: 0112223322220111332?
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Jul 4, 2010
How do i determine the pixel width and pixel height of the largest image i can paint onto the graphics object of a printer while inside a printpage event?
Imports
System.Drawing
Class
[Code]......
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Sep 13, 2007
Is there a quick way to check the color of a pixel on the screen?
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Jul 20, 2009
during the development of my project, i've fall in the need to change the position of some forms, pixel by pixel using a timer.Now, i've checked that the movement is very fluid when form is not very heavy, when it contains few elements, but when it has a lot of elements inside, the movement becames nervous and not fluid, the movement becomes jerky.
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Sep 14, 2011
The purpose of the code below is to scan a program of mine to detect a pixel color change. It loops through until a change is detected. It works fine for about 10-15 seconds and then I get an ArgumentException was unhandled error. So far this has happened on two different lines at separate times...
Image = New Bitmap(Rec.Right - Rec.Left, Rec.Bottom - Rec.Top)
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Mar 10, 2012
How can I move the mouse to a pixel location of a program?[code]I know it doesn't work, but I'm trying to make it easier to understand what I'm trying to do.
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Mar 21, 2011
I am fairly new to visual basic and have written this program to detect a change in a selected pixel on the screen. When the pixel changes, a sound plays every x seconds. It works fine but after a few hours of operation a possible memory leak causes it to either crash the program or the PC. I have watched the process and I can see 4k added to it every 4 seconds or so. Where this memory leak is coming from?
Here is the code:
Public Class Main
Public pointx As Long
Public pointy As Long
Public areaselected As Integer
Public TimeToPause, SecondTimer, changefound As Integer
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Jul 29, 2010
How can I find out the pixel colour of a certain point on a web browser. For instance,WebBrowser1.getPixelColor(0,0) would get the rgb colour value of pixel 0, 0.It doesn't have to be rgb it might be hsl or whatever.The web browser is showing a local web page that is hosted on a network. If there is an error then the screen goes all grey. What I want to do is, if this does happen, display an alert message like - "An error has occurred
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Apr 16, 2011
I have an empty picture box with the background colour set to the transparancy colour. How can i get the colour of the pixels within the transparant picture box so that i can create a bitmap of the transparant section of the form?
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Aug 6, 2009
I'm having trouble getting the pixels of a Picturebox. My code is as follows:
Option Strict Off
Option Explicit On
Imports VB = Microsoft.VisualBasic
Imports System.Runtime.InteropServices
[Code]...
The program is supposed to load a picture, and then get each every pixel on the first line, adding the HEX color code and a "," to the richtextbox. At the last pixel of each line, it adds a ";" and skips to the next line, repeating the process until all processes are read. I've done this successfully by creating a new bitmap and using the .GetPixel from that, but that is terribly slow. Will this be faster? If not, is there any other API I could use that is faster?
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Nov 28, 2010
Look at this code, it's so simple, yet I can't manage to get it to workon the top of form1 is
Option Strict On
Imports System.Drawing
Imports System.Drawing.Drawing2D
[code].....
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May 18, 2010
My program works through each cell in a raster bitmap loooking at the r g b values. Actually I'm just working with greyscale so r = g = b. I use the get pixel method to return the 8 bit value of each pixel (0 - 255). However I'm now working with a single channel 32 bit float bitmap. I can't load it into VB. I tried Dim myBitmap As New Bitmap(OpenFileDialog1.FileName) but this fails with an unspecified error when trying to open a 32 bit tiff.
The question is: which graphics format will allow me to load a 32bit bitmap into VB, and if I succeed will the getpixel method return 32bit float results for the greyscale level for each pixel?
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May 18, 2010
I have a icon maker program. I have two pictureboxes pic1 and pic2 and a open image button. I need a code that will if the pic1.image color has any red in it, it will take that red and turn it into the desired color. I know you can use getpixel and setpixel but I don't know how to use these.
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Feb 28, 2012
Is it possible to use GetPixel in a different way? I want to use it like:
'If GetPixel(x,y) = COLOR Then
Loop Until GetPixel(x,y) = DIFFERENT COLOR
Something like that...
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Jul 22, 2011
i need some help on explaining to me whats going on in the code below. Basically, the code below is used to convert a bitmap image to grayscale level (black and white).
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim pic As Bitmap
pic = picVisible.Image
Dim X As Integer
[code].....
what i dont understand is the part;
color = (CInt(pic.GetPixel(X, Y).R) + pic.GetPixel(X, Y).G + pic.GetPixel(X, Y).B) / 3
why is it that the Cint() is only used for pic.GetPixel(X,Y).R) and not for the others ? Any Image processing expert that can help explain this ?
Note: The code works well and manages to convert an image into its grayscale.
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May 23, 2012
I worked in a role and functioning properly. The problem is that it is a bit slow for use in many images would be very slow. I read online that with stride and scan0 and working in memory with buffer can be made faster, but i donīt understand anything . Does anyone know how it works or how to make my code run faster?
[Code]...
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Apr 17, 2009
i am working on a project in vb.net 2003 and i want to get the color of a pixel when i click on the image loaded in the picturebox.i ve tried anything but nothing seems to work....
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Apr 24, 2010
What I'm trying to do is iterate through each pixel in a bitmap, and get the color value of each pixel.I've tried using .getpixel, but it's fairly slow. On a 640x480 image, it takes roughly .35 seconds to go through it. Which can add up if doing many pictures.
[Code]...
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Mar 3, 2012
[code]Well, the first GetPixel works fine, it sets textbox2 to yellow if the pixel is ofund and textbox1 says green. But, the second GetPixel doesn't work. The coordinate are correct and the color is also, but I never receive the msgbox.
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May 30, 2012
Which would be better to use if I want to find one pixel?
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Apr 6, 2012
I have a timer that among other things, checks 5 spots on the screen for a color change. My program monitors a phone system app and checks to see if there is a new incoming phone call from any of 5 buttons. I'm using the following code based on another question I had posted. Monitor an area of the screen for a certain color in Visual Basic
Private Function CheckforCall()
Try
Dim queue1 As Integer = GetPixel(GetDC(0), 40, 573)
Dim queue2 As Integer = GetPixel(GetDC(0), 140, 573)
[code]....
Using this code, GDI Objects skyrockets very quickly and within short order, throws an OutOfMemory exception. I'm assuming I'm not releasing the DC properly, but I can't seem to find any other way to do it.
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Oct 12, 2010
I'm trying to find the colors of pixels using GetPixel(x,y) with bitmaps.
I understand how to use it and it works.
When I use .ToString I get the string version of the color.
Now when I use .ToArgb I get a negative number and the colors are backwards?
16777215 should be white and 0 should be black.
This is an example of some results:
-16273900 is showing close to black and -32567 is showing close to white.
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Jan 6, 2011
I am trying to use GetPixel and SetPixel to copy the contents of one picture to another (I know there are other methods to do so, but there are reasons I want to try this ;D)Anyway, the pictures are .png images, so they include transparency settings.
But for some reason, it seems like when I use GetPixel & SetPixel to put one image over another, it seems the second image completely replaces the other one. I mean, it seems the transparency settings are not respected when I use GetPixel & SetPixel.Both images have the same size. Both have transparent areas.
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Mar 29, 2010
How do I retrieve the name of a textbox that has the focus? I have many textboxes on my form and when the user right clicks anywhere in one of the textboxes I want my code to store the name of the textbox in a string variable such as NameOfSelectedTextBoxString as string.
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Dec 5, 2009
I get no compile/debug errors. When I opened it, and tested it on this site, it doesnt move the mouse to 255, 0, 0 (red). it moves it to 128-128-0.
Try
Dim dc As IntPtr
Dim screencolor As Integer
If myHandle <> IntPtr.Zero Then
dc = GetDC(myHandle)
Dim XPos As Integer = Cursor.Position.X
Dim YPos As Integer = Cursor.Position.Y
[Code] .....
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Apr 23, 2010
I get no compile/debug errors. When I opened it, and tested it on this site, it doesnt move the mouse to 255, 0, 0 (red). it moves it to 128-128-0.
Try
Dim dc As IntPtr
Dim screencolor As Integer
If myHandle <> IntPtr.Zero Then
[code]....
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Aug 20, 2010
in Directx Full Screen Game GetPixel Function Not Working (#000000)
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Nov 4, 2011
I am using Dev Express to develop a form in which i have a GridControl with a View inside a View.It looks like this:
I am then trying to use the event ValidatingEditor to validate the user input.I tried to do that by doing:
Private Sub grvObsAM_Artigos_ValidatingEditor(ByVal sender As Object, ByVal e As DevExpress.XtraEditors.Controls.BaseContainerValidateEditorEventArgs) Handles grvObsAM_Artigos.ValidatingEditor
Dim row As Integer = Me.grvObsAM_Artigos.FocusedRowHandle
This, however always returns me something like -99999.. I poked around and tried this other solution using the sender from the event:
Private Sub grvObsAM_Artigos_ValidatingEditor(ByVal sender As Object, ByVal e As DevExpress.XtraEditors.Controls.BaseContainerValidateEditorEventArgs) Handles grvObsAM_Artigos.ValidatingEditor
Dim grv As DevExpress.XtraGrid.Views.Grid.GridView = CType(sender, DevExpress.XtraGrid.Views.Grid.GridView)
Dim row As Integer = grv.FocusedRowHandle
And using this second solution i managed to get the focused row handle. Even though this worked this time (because the event was triggered by the view itself and i had access to the sender) this doesn't solve my problem as there are other events where the sender is not the view and the problem persists.Usign Me.grvObsAM_Artigos."insert anything here" doesn't seem to work properly.
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