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Color.Transparent isn't what you think it is when GetPixel is used. AFAIK, GetPixel NEVER returns transparent pixels! You'd be better off finding the pixels that are closer to the color that you're looking for.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Can I ask u a question? If the image was converted to grayscale and then canny edge detection was applied to it, does that mean the final image contains only two types of colors?
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szevy_suez wrote: does that mean the final image contains only two types of colors?
Uhhh, Light Gray and Dark Gray?? What are you talking about?
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Since I want to recognise a shape in an image, I need to know what color the shape's pixels contain, so I can check each pixel's color to identify whether the pixel belongs to the shape. However, I am not sure about the exact color. Do you know how to change an image to a 2bit black and white image? That shud make that easier rite?
Currently, I was only able to change the image to grayscale image and then apply edge detection to it, to get the outline of the shape, since what I want is only the x and y coordinates of the outline. Then, since you said GetPixel don't really return transparent color, what I thought was to get the color of GetPixel(1,1) which usually belongs to the background of the image and get all the x and y coordinates of pixels which do not have the same color as Pixel(1,1). But of course this could not be done if the image consist of more than two colors. Will an image after grayscale conversion and edge detection application contain more than TWO colors?
However, if I can convert the image to a 2 bit black n white image, it would be better.
Please advise.
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szevy_suez wrote: Will an image after grayscale conversion and edge detection application contain more than TWO colors?
Yes. It'll be made up of various shades of gray. In a photograph, upwards of 65,000 shades...
Image processing is not my field. Search the articles for "Image processing" and you'll find a great series of articles by Christian Graus on image manipulation.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hello There
I have build one Window Service and Installed it on Machine A. Now I am on Machine B and want to access some function of Service Running on Machine A. how ?
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You cannot make a service perform a function unless your service is 'listening' for input. Take a look at implementing the TCPListener object in your service - there is a good article here[^] that gives some background on using TCPListener, and socket programming in general. It's in C#, but should be pretty simple to convert.
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hi!
i have a problem in listbox
i want to add items from textbox to listview
im using following code
but it didnt work
code
lstv.Items.Add(Me.txtStatusId.Text.ToString)
lstv.Items.Add(Me.txtStartSerial.Text.ToString)
lstv.Items.Add(Me.txtEndSerial.Text.ToString)
lstv.Items.Add(Me.txtBenefit.Text.ToString)
lstv.Items.Add(Me.txtDiscount.Text.ToString)
lstv.Items.Add(Me.txtQuantity.Text.ToString)
lstv.Items.Add(Me.txtTotalAmount.Text.ToString)
it adds data to listview in rowwise i want to add data columnwise
note: lstv is the listview and txtStatusId is textbox etc
-- modified at 7:59 Monday 7th August, 2006
khurram saddique
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Dim lst as new listViewItem(Me.txtStatusId.Text.ToString)
lst.subitems.add(---)
lst.subitems.add(---)
lst.subitems.add(---)
lst.subitems.add(---)
lstv.items.add(lst)
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skhurams wrote: i want to add data columnwise
Use lstv.Items.SubItems.
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One of my pet-peves. Why are you calling .ToString() on a Text property?? Text already returns a String, so you don't need to be calling .ToString() on it.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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That bugs you too?
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I wonder if anyone could help.
How can disable or the X on a form but keep minimize button
Protected Overrides Sub OnClosed(ByVal e As System.EventArgs)
The reason is because I could have another form (child of MDI) open at the time. I want to be able to say "There is a form open cannot do this close"
Is there any code to do this or is it just a case of properties of a form.
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on close event you get e in paramter
write
e.cancel=true ' this is stop from closing and then you can do
me.windowstate= minimize,maximized etc
or what ever
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Not sure about removing the close button without removing the minimize button. You could use the Me.ControlBox = False property but that'll remove minimize, maximize and close.
I think a better solution would be to use the OnClosing method of the form object and set the e.Cancel = True property depending on the conditions you have set.
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Looking at API Guide (very useful program), I found some code in VB that can help you with disabling the close button. I may post back with some udpated .NET code (I have wrote VB and VC# versions but I am at wrong computer), but as of right now this is all that I can contribute. You could also try googling the subject.
Private Declare Function GetSystemMenu Lib "user32" (ByVal hwnd As Long, ByVal bRevert As Long) As Long
Private Declare Function GetMenuItemCount Lib "user32" (ByVal hMenu As Long) As Long
Private Declare Function DrawMenuBar Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function RemoveMenu Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long) As Long
Const MF_BYPOSITION = &H400&
Const MF_REMOVE = &H1000&
Private Sub Form_Load()
Dim hSysMenu As Long, nCnt As Long
' Get handle to our form's system menu
' (Restore, Maximize, Move, close etc.)
hSysMenu = GetSystemMenu(Me.hwnd, False)
If hSysMenu Then
' Get System menu's menu count
nCnt = GetMenuItemCount(hSysMenu)
If nCnt Then
' Menu count is based on 0 (0, 1, 2, 3...)
RemoveMenu hSysMenu, nCnt - 1, MF_BYPOSITION Or MF_REMOVE
RemoveMenu hSysMenu, nCnt - 2, MF_BYPOSITION Or MF_REMOVE ' Remove the seperator
DrawMenuBar Me.hwnd
' Force caption bar's refresh. Disabling X button
Me.Caption = "Try to close me!"
End If
End If
End Sub
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hellow to all ..
can i load OnPaint More than one time at the same forum ?
let say i wanna load OnPaint when i click on a button ?
i am trying to do so , but i recive an error ..
help please ..
thxxx
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What do you mean by "load OnPaint"?
What is the code that you used, and what error message do you get?
---
b { font-weight: normal; }
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i do not get error message ..
but what i wanna do is to be able to call OnPaint , can i call it let say from a button click when i click on the button ?
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microuser_2000 wrote: i do not get error message ..
What did you mean by "but i recive an error", then?
but what i wanna do is to be able to call OnPaint , can i call it let say from a button click when i click on the button ?
You could, but that is not the proper way of redrawing a control. Call the Invalidate method of the control, that will put a message in the queue that tells the message pump that the Paint event has to be called to redraw the control.
---
b { font-weight: normal; }
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me.refresh() forces the form to redraw .. hopes this helps.. also
me.invalidate() I think this also do the same thing.. not sure for this option
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me.invalidate will repaint the entire control.
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Hi,
I am using the contextmenustrip in an application and add the items programmatically at runtime.
What I cant figure out is how to add a second level to the menu, like:
MenuItem 1
MenuItem 2 -> SubItem 1
MenuItem 3
Any help would be highly appriciated.
/Jens
-- modified at 5:20 Monday 7th August, 2006
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Though I can provide you the code but the best thing is you do it your self...
in the design time add the child menu as you like and see the code in the windows designer code area. the same way you have to add dynamically.. also you need the addhandler option with one procedure to add the handler for a dynamically added menu item
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Any ideas how I can have the dropdown portion of a combobox to stay down after it has lost focus. I am tring to attach a tooltip but when my tip pops up the combobox looses focus and the drop down goes back up. I am using vb.net.
Mark Thibodeaux
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