ACC: How to Determine the Current Screen Resolution (95/97)

• Microsoft Access versions 7.0, 97

SUMMARY

Advanced: Requires expert coding, interoperability, and multi-user skills.

This article describes a sample user-defined Visual Basic for Applications function that you can use to determine the current screen resolution. This function is useful in determining if you are running in standard VGA mode (640 x 480) or Super VGA mode (800 x 600 or 1024 x 768).

This article assumes that you are familiar with Visual Basic for Applications and with creating Microsoft Access applications using the programming tools provided with Microsoft Access. For more information about Visual Basic for Applications, please refer to your version of the "Building Applications with Microsoft Access" manual.

MORE INFORMATION

The following example demonstrates how to create and use the sample GetScreenResolution() function.

NOTE: You may have some Microsoft Windows API functions defined in an existing Microsoft Access library; therefore, your declarations may be duplicates. If you receive a duplicate procedure name error message, remove or comment out the declarations statement in your code.

1. Create a new module, and type the following Declarations and function:

         '*****************************************************************
         ' DECLARATIONS SECTION
         '*****************************************************************
   

         Option Explicit
   

         Type RECT
             x1 As Long
             y1 As Long
             x2 As Long
             y2 As Long
         End Type
   
         ' NOTE: The following declare statements are case sensitive.
   
         Declare Function GetDesktopWindow Lib "User32" () As Long
         Declare Function GetWindowRect Lib "User32" _
            (ByVal hWnd As Long, rectangle As RECT) As Long
   
         '*****************************************************************
         ' FUNCTION: GetScreenResolution()
         '
         ' PURPOSE:
         '   To determine the current screen size or resolution.
         '
         ' RETURN:
         '   The current screen resolution. Typically one of the following:
         '      640 x 480
         '      800 x 600
         '      1024 x 768
         '
         '*****************************************************************
         Function GetScreenResolution () as String
             Dim R As RECT
             Dim hWnd As Long
             Dim RetVal As Long
             hWnd = GetDesktopWindow()
             RetVal = GetWindowRect(hWnd, R)
             GetScreenResolution = (R.x2 - R.x1) & "x" & (R.y2 - R.y1)
         End Function
   
   

2. On the View menu, click Debug window.

3. Type the following line in the Debug window, and then press ENTER:

         ? GetScreenResolution()
   

   Note that the current screen resolution is displayed in the Debug window. If the current resolution is standard VGA, the following is displayed in the Debug window:

         640x480
   

REFERENCES

For more information about how to determine the current screen resolution in Microsoft Access 2.0, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q113458
   TITLE     : ACC2: How to Determine the Current Screen Resolution (2.0)

   ARTICLE-ID: Q147781
   TITLE     : How to convert API calls from 16-bit to 32-bit.

Keywords          : kbprg PgmApi PgmHowTo
Version           : 7.0 97
Platform          : WINDOWS
Hardware          : x86
Issue type        : kbhowto