Pixel Color Detection

How do i check what color the pixel is in a certain size box? I want to make a box that is about 100x100 pixels in the center of the screen, that checks for certain colors then if it detects them it executes a function.

VB Code:

Declare Function GetPixel.... () ... 'whatever goes here!
Type RECT
    Left as Long
    Right as Long
    Top as Long
    Bottom as Long
End Type
 
Function Check(R as RECT) 'R is the box that you have, for a 100x100 set this to .bottom = 100, .right = 100
Dim A
Dim H
    For A = R.Top to R.Bottom
        For H = R.Left to R.Right
            If GetPixel(mypicturebox.hDC, A, H) = RGB(0,0,0) Then 'checks for black
                Myfunction()
                Exit For
                Exit For
                Exit Function
            End If
        Next H
    Next A
End Function

Here's the API declaration...

Code:

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Declare Function GetPixel Lib "gdi32" Alias "GetPixel" _
      (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long

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alternatively you can use the picture point method...

Code:

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if picture1.point(x,y)=vbblack then

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- Dim A