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• A little Color Spy program that displays the color/values of the pixel under the mouse.

A little Color Spy program that displays the color/values of the pixel under the mouse.

A little Color Spy program that displays the color/values of the pixel under the mouse.

API Declarations


Add two text boxes named Text1 and Text2.
Add a picturebox named Picture1.
Copy the code below into the code section of the form.
Code will position objects in form.



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Private Toggle As Boolean

Private Type POINTAPI
    X As Long
    Y As Long
End Type

Private Declare Function GetCursorPos Lib "USER32" (lpPoint As POINTAPI) As Long
Private Declare Function GetPixel Lib "gdi32.dll" (ByVal hdc As Long, ByVal nXPos As Long, ByVal nYPos As Long) As Long
Private Declare Function ReleaseDC Lib "user32.dll" (ByVal hWnd As Long, ByVal hdc As Long) As Long
Private Declare Function GetWindowDC Lib "USER32" (ByVal hWnd As Long) As Long
Private Declare Function GetDesktopWindow Lib "USER32" () As Long

Private Sub Form_Load()
Me.Move 0, 0, 2715, 2100
Text1.Move 0, 0, 2565, 285
Text2.Move 0, 300, 2565, 285
Picture1.Move 0, 600, 2564, 465
With Me
    .AutoRedraw = True
    .CurrentX = 9: .CurrentY = 1125
    Me.Print "Position mouse pointer in this area,"
    .CurrentX = 9: .CurrentY = 1290
    Me.Print "hold left mouse button down, move"
    .CurrentX = 9: .CurrentY = 1455
    Me.Print "mouse to color and release button."
End With
End Sub

Private Sub Form_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
'turn toggle off when left mouse button is released
If Button = 1 Then Toggle = False
End Sub

Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
'turn toggle on when left mouse button is pressed over form
If Button = 1 Then Toggle = True
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim mXY As POINTAPI, mHc As Long, rgbV As Long, mDC As Long
Dim R As Byte, G As Byte, B As Byte, rv As Long
Dim oXY As POINTAPI, HexVal As String
If Toggle Then
    rv = GetCursorPos(mXY) 'get mouse position
    mHc = GetDesktopWindow() 'get a handle to screen
    mDC = GetWindowDC(mHc) 'get device context to screen
    rgbV = GetPixel(mDC, mXY.X, mXY.Y) 'get pixel color
    rv = ReleaseDC(mHc, mDC) ' release device context
    '---convert color value from long to hex/rgb-----------------------
    HexVal = Hex(Val(rgbV))
    If Len(HexVal) < 6 Then
        HexVal = String(6 - Len(HexVal), "0") + HexVal
    End If
    R = CLng("&H" + Mid(HexVal, 1, 2)) 'red color value
    G = CLng("&H" + Mid(HexVal, 3, 2)) 'green color value
    B = CLng("&H" + Mid(HexVal, 5, 2)) 'blue color value
    '--display information-----------------------------------------------
    Me.Caption = "(x,y)=" & mXY.X & "," & mXY.Y 'mouse position in title bar
    Picture1.BackColor = rgbV 'display color in picture box
    Text1.Text = "RGB= " & R & "," & G & "," & B 'show RGB values
    Text2.Text = "Hex= " & HexVal 'show hex color value
End If
End Sub