Hi, Batel - 

Your current assessment of the System32 and SysWOW64 is incorrect. It is actually the opposite: 64-bit system DLL's reside in the System32 folder and the 32-bit system DLL's reside in SysWOW64. "SysWOW64" stands for "System (32-bit) Windows On Windows64".

Instead of spending a lot of time here explaining the finer nuances of interfacing PB applications with the Windows API, I encourage you to read through a series of tech articles on this subject. Here are links to the first two (of four total) that I think you will benefit the most from:

    https://community.appeon.com/index.php/articles-blogs/tutorials-articles/2-powerbuilder/302-interfacing-pb-applications-with-the-windows-api-part-1

    https://community.appeon.com/index.php/articles-blogs/tutorials-articles/2-powerbuilder/303-interfacing-pb-applications-with-the-windows-api-part-2

Please be aware that the internal memory length of a structure can vary between 32-bit and 64-bit, depending on the datatypes of the structure members it contains and also if the structure contains Unicode or ANSI characters/strings. The tech articles I've linked to explain all of this.

If you will provide more detail regarding the layout of the PB structure(s), I can help provide you with the external function declaration(s) you can use with the RtlMoveMemory API. It is also important to know which direction the data in the structure is to be copied from/to (From PB to Windows, or from Windows to PB).

Best regards, John

Windows will automatically use the correct version based on the bitness of your application. There is no 'registration' process.

To make your external function references work in 64bit, you need to make sure you are using the correct data types.

Pointers / Handles - Longptr

DWORD / UINT - ulong

int - long

SIZE_T - Longptr

SHORT - integer

Hi Batel;

  I use the "RtlMoveMemory" external SDK command in my STD Framework "all over the place". Here are some declarations that I use that also work perfectly for me also in 64 bit Apps ...

SUBROUTINE  BlobToUIntArray (  REF UnsignedInteger Dest[],  REF Blob  Source,   Long   Length  ) LIBRARY "kernel32.dll" Alias For "RtlMoveMemory"
SUBROUTINE  CopyMemory ( Ref string Destination, ulong Source, long Length ) Library  "KERNEL32.dll" Alias For "RtlMoveMemory"
SUBROUTINE  CopyMemory ( REF blob dest, longptr srcAddr, longptr len ) LIBRARY "kernel32.dll"Alias For "RtlMoveMemory"
SUBROUTINE  CopyMemoryIP ( Ref structure Destination, ulong Source, long Length 	) Library  "KERNEL32.dll" Alias For "RtlMoveMemory"
SUBROUTINE  CopyMemoryIP ( Ref blob Destination, ulong Source, long Length ) Library  "KERNEL32.dll" Alias For "RtlMoveMemory"
SUBROUTINE  CopyMemoryIP ( Ref ulong Destination, ulong Source, long Length ) Library  "KERNEL32.dll" Alias For "RtlMoveMemory"

HTH

Regards ... Chris