Powerbuilder api test tools

I found a definition of function in http://ift.tt/1QfbVVh

function boolean FNX_IsPowerObject(long hwnd) Library "PBVM100.dll"

but now I need the signature for this 3 functions:

function ? FNX_DataWindowGetItemDateTime(long hwnd, parm1, parm2, parm3) Library "PBVM100.dll"
function ? FNX_DataWindowGetItemNumber(long hwnd, parm1, parm2, parm3) Library "PBVM100.dll"
function ? FNX_DataWindowGetItemString(long hwnd, parm1, parm2, parm3, parm4) Library "PBVM100.dll"

I do not know the type of function parameters. Someone knows?