ACC: How to Get Red, Green, or Blue Components from RGB Value

MORE INFORMATION

1. Open the sample database Northwind.mdb (or NWIND.MDB in versions 1.x and 2.0).
2. Create a module and type the following line in the Declarations section if it is not already there:

   Option Explicit

3. Type the following procedure:

           '-----------------------------------------------------------------
         'PURPOSE: Returns red/green/blue color from RGB color value.
         'ACCEPTS: RGB color value as Long, and component number as integer
         '         that represents the component color to return (1=red,
         '         2=green, 3=blue).
         'RETURNS: The intensity of the color component (0 - 255) as an
         '         integer or -1 indicating that an argument was invalid.
         '-----------------------------------------------------------------
         Function GetRGB (RGBval As Long, Num As Integer) As Integer
            ' Check if Num, RGBval are valid.
            If Num > 0 And Num < 4 And RGBval > -1 And RGBval < 16777216 Then
              GetRGB = RGBval \ 256 ^ (Num - 1) And 255
            Else
              ' Return True (-1) if Num or RGBval are invalid.
              GetRGB = True
            End If
         End Function
   						

4. Save the module as MyUtilities, and then close it.
5. Create the following macro with the actions listed:

         Macro Name  Action   Comment
         ---------------------------------------------
         GetRGB      MsgBox   Display red component
                     MsgBox   Display green component
                     MsgBox   Display blue component
   
          GetRGB Actions
         -------------------------------------------------------------------
         MsgBox:
           Message: =GetRGB(Forms![Orders].Section(0).Backcolor,1) & ": Red"
         MsgBox:
           Message: =GetRGB(Forms![Orders].Section(0).Backcolor,2) & ": Green"
         MsgBox:
           Message: =GetRGB(Forms![Orders].Section(0).Backcolor,3) & ": Blue"
   						

6. Save the macro as GetRGB, and then close it.
7. Open the Orders form in Form view.
8. From the Database window, run the GetRGB macro. Note that you can change the BackColor property of the detail section of the Orders form, and then run the macro again to see the results change.