Get X/Y coordinates of install screen

Archive: Get X/Y coordinates of install screen

scubanarc
20th September 2012 04:08 UTC

Get X/Y coordinates of install screen
Hey Guys,

I've been searching for a couple of days on how to do this and have finally gave in and am asking for help.

I need to get the top-left or bottom-left x/y coordinates of the currently shown NSIS window. I'm supposed to pass these values through the registry to another application that is going to pop up at install-time and I want it to pop at the exact same location.

Any thoughts here?

- jason

MSG
20th September 2012 05:51 UTC

You need to call GetWindowRect using the system plugin.
http://msdn.microsoft.com/en-us/libr...=vs.85%29.aspx

Example: http://forums.winamp.com/showthread....75#post2688175

scubanarc
20th September 2012 16:46 UTC

Hey MSG, thanks for the reply. This helps a lot. If you could help me understand the mechanics of this a little bit I'd appreciate it.

Originally posted by MSG

        nxs::getWindow /NOUNLOAD

        Pop$1  ;(now contains the HWND of the nxs window)

       System::Alloc 16

        Pop$2

        System::Call "user32::GetWindowRect(i r1, i r2)"

       System::Call "*$2(i .r3, i .r4, i, i)"

       System::Free $2

        IntOp$4 $4 + 20

        System::Call 'User32::SetWindowPos(i $1, i $1, i $3, i $4, i 0, i 0, i 5)'

I understand everything up to this line:

        System::Call "*$2(i .r3, i .r4, i, i)"

What does *$2 mean and what does that line accomplish?

Also, I get that the lpRECT structure contains the values I want, but I don't understand how to get those values out.

- jason

Anders
20th September 2012 19:54 UTC

* means struct syntax, *$2 means access struct at memory address stored in $2 and i.r# (type input output, . (dot) means no input) extracts the first two INT32 fields in the RECT struct...

scubanarc
20th September 2012 22:04 UTC

Thank you very much for your help. I was able to get the values and use them with this example.

- jason