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Declaring API functions in 64 bit Office

January 28, 2010, 11:14 am by jkpieterse

Hi everyone,

The release date of Office 2010 is closing in and with this new version we’ll have a new programming challenge. Office 2010 comes in a 32 bit and a 64 bit version.
Especially API function declarations need to be adjusted for the 64 bit environment.
We’ll have to change a declaration like this one:

    Private Declare Function GetWindowLongptr Lib “USER32″ Alias _
“GetWindowLongA” (ByVal hWnd As Long, ByVal nIndex As Long) As Long

To:

    Private Declare PtrSafe Function GetWindowLongptr Lib “USER32″ Alias _
“GetWindowLongA” (ByVal hWnd As LongPtr, ByVal nIndex As Long) As LongPtr

So how do we know whether a Long needs to be changed to LongPtr, or to LongLong, or maybe even can be left unchanged? I decided it would be useful to gather a list of declarations on my website so we have a one-stop place where we can find the proper syntax for these things.

See:

Declaring API functions in 64 bit Office

If you have some additional API functions I could include, please let me know!

Regards,

Jan Karel Pieterse
www.jkp-ads.com

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One Comment

  1. Andrew Engwirda says:
    January 28, 2010 at 4:23 pm

    Hi Jan Karel,

    This is a great idea. Expect your website traffic (which I guess is already high) to get even higher :-)

    Andrew

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