Take the 2-minute tour ×  When passing a value to a function
that takes both a WPARAM and a LPARAM parameter, does it matter
on witch of them I pass it ? Someone told me that if I use
Windows x64 i should use WPARAM, is this true ?   share|improve
this question Are you talking about a Windows API or a function
that you're writing? If it's something you're writing, describe
what the arguments are - there's a good chance that
WPARAM/LPARAM might not be the best way to go. If it's a Windows
API, do what the docs say (should that have to be said?). – 
Michael Burr Jun 14 '11 at 6:28 It's something I am writing for
a user defined message, I dont even use two parameters, but I
saw in a book implemented this way, i just need to pass a string
to it, and inside my function i call Postmessage –  vBx Jun 14
'11 at 6:32  4 Answers 4  up vote 3 down vote accepted  When
sending messages, WPARAM and LPARAM parameters have specific
interpretations depending on the message. You need to pass those
parameters in the way that th