WoW64 checking, from inside Application

General FreeBASIC programming questions.
MrSwiss
Posts: 3573
Joined: Jun 02, 2013 9:27
Location: Switzerland

WoW64 checking, from inside Application

Postby MrSwiss » Apr 05, 2017 16:22

Hi all,

there are some cases (they're rare, but exist), when you want to know the *bitness* of the OS,
your Application is running on (in most cases, when the Application is 32bit), to do some shell-
execution (in order to use correct parameters).

In this case it's Windows only, reason: WIN-API used. There must exist a similar API-call on LIN.

I've left the links to relevant resources in the code below:

Code: Select all

' AppBitnessOnWIN64.bas -- 2017-04-05, by MrSwiss

' MSDN -- C++ || dll = kernel32 || reference: https://blogs.msdn.microsoft.com/oldnewthing/20050201-00/?p=36553

/' https://msdn.microsoft.com/en-us/library/windows/desktop/ms684139(v=vs.85).aspx -- code below

HANDLE WINAPI GetCurrentProcess(void);

BOOL WINAPI IsWow64Process(
  _In_  HANDLE hProcess,
  _Out_ PBOOL  Wow64Process
);

'/

' don't use it on WINNT32 OS, it's useless there, but try both FBC version's (32/64)
#Include Once "windows.bi"

Dim As Boolean   self      ' we're checking THIS process
Dim As Any Ptr  p_s   = @self   ' we need a pointer to 'result'

IsWow64Process(GetCurrentProcess(), p_s)   ' both are declared in "windows.bi"

' the outcome depends on the FBC (bitness) used (32 = TRUE / 64 = FALSE)
Print "Is this a WoW64 Application? (32bit App. on WIN64 OS?) = " + UCase(Str(self))
Print : Print
Print "any action QUIT's! ";

Sleep
And here, just to give a *real world scenario*:

Code: Select all

'#Define debug ' uncomment as needed

#Include Once "windows.bi"

Dim As Boolean   self      ' we're checking THIS process
Dim As Any Ptr  p_s   = @self   ' we need a pointer to 'result'

IsWow64Process(GetCurrentProcess(), p_s)   ' both are declared in "windows.bi"

Sub Message(ByVal msg As String, ByVal timeout As Long, ByVal WoW As Boolean)
  #Ifdef __FB_64BIT__   ' 64bit OS & Application (Compiler)
      Shell ("%SystemRoot%\System32\msg * /time:" + Str(timeout) + " " + msg)
  #Else               ' 32bit Compiler (check OS's bitness)
      If WoW = TRUE Then   ' WINNT64! - Application is 32bit
         Shell ("%SystemRoot%\Sysnative\msg * /time:" + Str(timeout) + " " + msg)
      Else            ' WINNT32! - Application is 32bit
       Shell ("%SystemRoot%\System32\msg * /time:" + Str(timeout) + " " + msg)
      EndIf
  #EndIf   ' __FB_64BIT__
End Sub

#Ifdef debug
   Message("LATEST NEWS IN 3 MINUTES !!! " + UCase(Str(self)), 5, self)
#Else
   Message("LATEST NEWS IN 3 MINUTES !!! ", 5, self)
#EndIf
' ----- EOF -----

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