用vb.net选择一个像素 [英] Pick a pixel with vb.net

问题描述

我希望我的应用程序在屏幕上(而不是在我的应用程序上)选择一个特定的像素，然后显示颜色.
我是vb6程序员，所以如果有人可以给我逐步的说明，我将不胜感激.

I would like my application to pick a specific pixel on the screen (not on my app) and then display the colour.
I''m a vb6 programmer, so if someone can give me step-by-step instructions I would greatly appreciate it.

推荐答案

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什么是WPF?
Windows Presentation Foundation [

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What is WPF?
Windows Presentation Foundation[^]

Where does the system.drawing command go?
Nowhere, it isn''t a command but an assembly - it contains drawing code you can use if you reference the assembly in your application/


Try:

<DllImport("gdi32")> _
Public Shared Function GetPixel(hDC As IntPtr, XPos As Integer, YPos As Integer) As UInteger
End Function

<DllImport("user32.dll", CharSet := CharSet.Auto)> _
Public Shared Function GetCursorPos(ByRef pt As POINT) As Boolean
End Function

<DllImport("User32.dll", CharSet := CharSet.Auto)> _
Public Shared Function GetWindowDC(hWnd As IntPtr) As IntPtr
End Function

''' <summary> 
''' Gets the System.Drawing.Color from under the mouse cursor. 
''' </summary> 
''' <returns>The color value.</returns> 
Public Shared Function [Get]() As Color
	Dim dc As IntPtr = GetWindowDC(IntPtr.Zero)

	Dim p As POINT
	GetCursorPos(p)

	Dim color__1 As Long = GetPixel(dc, p.X, p.Y)
	Return Color.FromArgb(CInt(color__1))
End Function


<StructLayout(LayoutKind.Sequential)> _
Public Structure POINT
	Public X As Integer
	Public Y As Integer
	Public Sub New(x__1 As Integer, y__2 As Integer)
		X = x__1
		Y = y__2
	End Sub
End Structure

(那是从我的C#代码自动转换而来的，因此它可能会编译，也可能不会编译.应该这样做，开发人员Fusion相当不错)

(That is auto converted from my C# code, so it may or may not compile. Should do though, developer Fusion is pretty good)

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