; Author: Carlo Somigliana (for PB4.40)
; email: somic@libero.it, site: http://semelinanno.com
; Date: 6. Dicember 2010
; OS: Windows

; ----------------------------------------------------------------------------- 
; Public domain
; ----------------------------------------------------------------------------- 
; Inter Process SendMessage
; ----------------------------------------------------------------------------- 

; InterProcessMssg
;--------------------------
; This code has been inspired by an article on CodeProject site (Reference: CProcessData 
; A template class To ease up SendMessage calls across processes: By Nishant Sivakumar
; link: http://www.codeproject.com/KB/winsdk/CProcessData.aspx)

; I started trying to translate the C++ Class in PB for the PB comunity to solve an old problem (for me) 
; of the Send/PostMessage functions not working across different processes (not always, only when the 
; result is not in the returned parameter but is a buffer/structure).
;
; In fact, in the usual way the destination buffer can not be mapped in the other process address 
; space and the message function fails. With this functions (IPM_...) you should be able to overcome this 
; limit (if by design, it is not very well documented) and access with the functions VirtualAllocEx_ 
; And Read/WriteProcessMemory_ the required data
;
; Soon the exercise expanded (or exploded) to become more general and requiring additional coding and
; testing of various solutions.
;
; This code has 2 sections: a DLL part and a Test (CompilerIf) part
; Run it should show the results of various examples, while compiled it should give a DLL with the 
; IPM and some other usefull functions (without the test code). 
; The DLL is not working (see 3rd WARINIG below).
;
; The _DllTest_ assemble the code written to test various solutions. Take it as is: it is badly written
; and poorly commented, but I hope understandable (with some efforts)
; It looks for a specific rathet window using different combinations of parameters for SenMessage; 
; If Not found it runs the relevant program and then search again for the window
; 
; IMPORTANT: 3 WARNINGS:
; 1. It was born as a DLL but the code has not been written to be a real DLL (not yet)
; 2. Example 7 (with WINWORD) is not working and I've decided to stop spending to much time with MS products
; 3. Procedure FindWindowBy there is a CompilerIf directive to avoid a *Memory causes a "Invalid Memory Access"
;       after approx. 160 callbacks of EnumChildWindows_
;       I don't have the same problem with Asci Executable or using a string as buffer. 
;       I leave to the many programmers more expert than me the job to identify the bug in this code 
;       or in PB IDE). Just a small request: let me know if you discover something.
;
; VERY IMPORTANT: 
; The entire code takes benefit from the free contribution of other PB experts (much more than me) 
; and is then released FREE for the PB community. Do what you want with it (at your own risk...;-)
; If you want to drop me a message for feedback (any comments and bugs), feel free to do it
; 
; Well, this has been my 2009 Christmas fun (???) and my modest gift to the forum. 
;
;        Happy 2010 To each PB programmer.
;
; Regards,
; Somic