[Code] Win32 - Get SketchUp Window Handle (WIP)

honoluludesktop

Handle is a term I recall from my "good old DOS days" :-) Can the "SketchUp Window Handle" be used to close an instance of SketchUp from another instance of SketchUp?

Dan Rathbun

@honoluludesktop said:

Handle is a term I recall from my "good old DOS days" :-) Can the "SketchUp Window Handle" be used to close an instance of SketchUp from another instance of SketchUp?

Yes ... BUT ... we must first solve the issue of getting the CORRECT handle for each instance, and storing it (in the proper place,) where it can be accessed by multiple plugins.
Once the "handle" is determined, the code that was needed to find it, is no longer needed, and should be garbage collected.

THEN ... you'll need to solve the issue of talking between two instances of Sketchup Ruby, and having one inform the other what it's window handle is.

thomthom

GetActiveWindow
http://msdn.microsoft.com/en-us/library/ms646292%28v=vs.85%29.aspx

@unknownuser said:

The return value is the handle to the active window attached to the calling thread's message queue. Otherwise, the return value is NULL.

What is interesting with this function is that it find a window based on the calling thread. But it's limitation is that it requires one of the windows that belong to the thread to the the active one.

But, I'm trying to find a function that either let you enumerate the windows that belong to a thread, or get the top most window for a thread. In either one of those conditions one should be able to reliably get the window handle.

I think one can get lots of useful info if one can get the thread id of the SketchUp process. Any ideas of how one can do this. I've been scanning the Win32 API a bit today looking for relevant functions.

thomthom

@jim said:

I am not entirely sure the Win32API.so file we all have been using supports callbacks, which the windows enumerator functions require as arguments.

Specifically, calls to EnumWindows and EnumChildWindows can not be used with Win32API.

The win32-api ruby library does support callbacks, and we should really be using that it anyway. it's more robust, and more stable (I've read.)

I was just looking at this. I noticed the lack of Callback.
Where is the win32-api found - the one that supports callbacks?

Jim

@thomthom said:

Where is the win32-api found - the one that supports callbacks?

RubyForge - Page not found

(win32utils.rubyforge.org)

I'm not sure if this can co-exist with Win32API or not.

require 'win32/api'

win32.zip

Jim

I am not entirely sure the Win32API.so file we all have been using supports callbacks, which the windows enumerator functions require as arguments.

Specifically, calls to EnumWindows and EnumChildWindows can not be used with Win32API.

The win32-api ruby library does support callbacks, and we should really be using it anyway. it's more robust, and more stable (I've read.)

thomthom

The example I saw of it:
http://stackoverflow.com/questions/3327666/win32s-findwindow-can-find-a-particular-window-with-the-exact-title-but-what/3328209#3328209

Seemed to use namespace Win32 as oppose to Win32API.

So this is not a module that ships with Ruby?

Dan Rathbun

@thomthom said:

So this is not a module that ships with Ruby?

Correct... no it's not, because it is platform specific, AND considered an extension. You, or any user must download it from RubyForge. If you want the latest releases, as they are released. I believe you also must compile them yourself, or wait until Mr. Berger & Co decides to do it.

Dan Rathbun

@thomthom said:

win32-api Seemed to use namespace Win32 as oppose to Win32API.

True it has it's own namespace... and another quirk.. Dan Berger reordered the arguments in the API calls making it a bit cumbersome to have scripts that can use either library.

Dan Rathbun

@jim said:

I am not entirely sure the Win32API.so file we all have been using supports callbacks, which the windows enumerator functions require as arguments. ...
Specifically, calls to EnumWindows and EnumChildWindows can not be used with Win32API.

Actually Win32API.so is obsolete, and for some time, they have been suggesting coders migrate to using the DL library directly.

In Ruby vers 1.9.x and up... they no longer supply a Win32API.so file, instead they have replaced it with a Win32API.rb script that mimics the old so file, and translates Win32API calls into DL library calls.

This is the Win32API.rb file distro'd with Ruby v 1.9.1 p429

<span class="syntaxdefault"></span><span class="syntaxcomment"># -*- ruby -*-<br /># for backward compatibility<br /></span><span class="syntaxdefault">warn </span><span class="syntaxstring">"Warning;#{caller[0].sub(/;in `.*'\z/, '')}; Win32API is deprecated after Ruby 1.9.1; use dl directly instead"</span><span class="syntaxdefault"> if $VERBOSE<br /><br />require </span><span class="syntaxstring">'dl'<br /><br /></span><span class="syntaxdefault">class Win32API<br />  DLL </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">{}<br /></span><span class="syntaxdefault">  TYPEMAP </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">{</span><span class="syntaxstring">"0"</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">=></span><span class="syntaxdefault"> DL</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">TYPE_VOID</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> </span><span class="syntaxstring">"S"</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">=></span><span class="syntaxdefault"> DL</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">TYPE_VOIDP</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> </span><span class="syntaxstring">"I"</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">=></span><span class="syntaxdefault"> DL</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">TYPE_LONG</span><span class="syntaxkeyword">}<br /><br /></span><span class="syntaxdefault">  def initialize</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">dllname</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> func</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> import</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> export </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxstring">"0"</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">*</span><span class="syntaxdefault">rest</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">    </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">proto </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">[</span><span class="syntaxdefault">import</span><span class="syntaxkeyword">].</span><span class="syntaxdefault">join</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">tr</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"VPpNnLlIi"</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> </span><span class="syntaxstring">"0SSI"</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">sub</span><span class="syntaxkeyword">(/^(.)</span><span class="syntaxdefault">0</span><span class="syntaxkeyword">*$/,</span><span class="syntaxdefault"> </span><span class="syntaxstring">'\1'</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">    handle </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> DLL</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">dllname</span><span class="syntaxkeyword">]</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">||=</span><span class="syntaxdefault"> DL</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">dlopen</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">dllname</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">    </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">func </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> DL</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">CFunc</span><span class="syntaxkeyword">.new(</span><span class="syntaxdefault">handle</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">func</span><span class="syntaxkeyword">],</span><span class="syntaxdefault"> TYPEMAP</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">export</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">tr</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"VPpNnLlIi"</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> </span><span class="syntaxstring">"0SSI"</span><span class="syntaxkeyword">)],</span><span class="syntaxdefault"> func</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">*</span><span class="syntaxdefault">rest</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  end<br /><br />  def call</span><span class="syntaxkeyword">(*</span><span class="syntaxdefault">args</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">    import </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">proto</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">split</span><span class="syntaxkeyword">(</span><span class="syntaxstring">""</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">    args</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">each_with_index do </span><span class="syntaxkeyword">|</span><span class="syntaxdefault">x</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> i</span><span class="syntaxkeyword">|<br /></span><span class="syntaxdefault">      args</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">i</span><span class="syntaxkeyword">],</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">[</span><span class="syntaxdefault">x </span><span class="syntaxkeyword">==</span><span class="syntaxdefault"> 0 </span><span class="syntaxkeyword">?</span><span class="syntaxdefault"> nil </span><span class="syntaxkeyword">;</span><span class="syntaxdefault"> x</span><span class="syntaxkeyword">].</span><span class="syntaxdefault">pack</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"p"</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">unpack</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"l!*"</span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> if import</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">i</span><span class="syntaxkeyword">]</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">==</span><span class="syntaxdefault"> </span><span class="syntaxstring">"S"<br /></span><span class="syntaxdefault">      args</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">i</span><span class="syntaxkeyword">],</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">[</span><span class="syntaxdefault">x</span><span class="syntaxkeyword">].</span><span class="syntaxdefault">pack</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"I"</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">unpack</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"i"</span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> if import</span><span class="syntaxkeyword">[</span><span class="syntaxdefault">i</span><span class="syntaxkeyword">]</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">==</span><span class="syntaxdefault"> </span><span class="syntaxstring">"I"<br /></span><span class="syntaxdefault">    end<br />    ret</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">func</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">call</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">args</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">    return ret </span><span class="syntaxkeyword">||</span><span class="syntaxdefault"> 0<br />  end<br /><br />  alias Call call<br />end<br /></span>

It looks as though the DL library supports callbacks. Maybe we should use it ??

I've also read that the DL library is 'on the outs', and they are planning to deprecate it and replace it with something else.

@jim said:

The win32-api ruby library does support callbacks, and we should really be using it anyway. it's more robust, and more stable (I've read.)

Yes.. I agree. Dan Berger is a "sharp cookie" when it comes to both Ruby and Windows coding. He is also on several of the MAJOR Ruby development teams including RubyGems and rdoc.
See his profile: RubyForge Profile for Daniel Berger

thomthom

@dan rathbun said:

@jim said:

I am not entirely sure the Win32API.so file we all have been using supports callbacks, which the windows enumerator functions require as arguments. ...
Specifically, calls to EnumWindows and EnumChildWindows can not be used with Win32API.

Actually Win32API.so is obsolete, and for some time, they have been suggesting coders migrate to using the DL library directly.

In Ruby vers 1.9.x and up... they no longer supply a Win32API.so file, instead they have replaced it with a Win32API.rb script that mimics the old so file, and translates Win32API calls into DL library calls.

Will that work for Ruby 1.8?

Dan Rathbun

@thomthom said:

I think one can get lots of useful info if one can get the thread id of the SketchUp process. Any ideas of how one can do this.
How about?
Process.pid()
Thread.main.object_id

@thomthom said:

I've been scanning the Win32 API a bit today looking for relevant functions.

Well all the API functions for: [Processes and Threads](http://msdn.microsoft.com/en-us/library/ms684847(v)

thomthom

Ah - there we go, that might help.
GetCurrentProcessId looks promising.

thomthom

pid = GetCurrentProcessId.call 4684 Process.pid() 4684
It seem to return the same thing.

Dan Rathbun

@thomthom said:

pid = GetCurrentProcessId.call 4684 Process.pid() 4684
It seem to return the same thing.

Yes and it's the same as you'll see in the Task Manager, or using tlist.exe from the command line (for that Sketchup instance.)

Dan Rathbun

@dan rathbun said:

It looks as though the DL library supports callbacks. Maybe we should use it ??

My bad..
Callbacks were added in 1.9.x, both 1.8.6 and 1.8.7 DL libs don't have the callback.rb file.

sorry Thom

thomthom

GetCurrentThreadId I think this one is what we can use to get associated window handles. Just need to get callbacks working so we can use EnumThreadWindows to get the windows for the calling thread.

thomthom

@jim said:

@thomthom said:

Where is the win32-api found - the one that supports callbacks?

RubyForge - Page not found

(win32utils.rubyforge.org)

I'm not sure if this can co-exist with Win32API or not.

require 'win32/api'
[attachment=0:26ojrmbj]win32.zip[/attachment:26ojrmbj]

I just tried it, works fine with Win32API.

Here's a bastardised proof of concept snippet where I found the SketchUp window regardless if it had focus or not.


# http://stackoverflow.com/questions/3327666/win32s-findwindow-can-find-a-particular-window-with-the-exact-title-but-what
EnumWindows       = Win32;;API.new('EnumWindows', 'KP', 'L', 'user32')
EnumThreadWindows = Win32;;API.new('EnumThreadWindows', 'LKP', 'I', 'user32')
GetCurrentThreadId = Win32API.new("kernel32.dll", "GetCurrentThreadId", '', 'L')

# Detect the toolwindows even if Hide Dialogs is active.
def enum_sketchup_windows
  threadId = GetCurrentThreadId.call
  enumWindowsProc = Win32;;API;;Callback.new('LP', 'I'){ |handle, param|
    #puts "EnumWindows - Callback"
    #puts "> handle; #{handle}"
    #puts "> param; #{param.inspect}"
    window_text = get_window_text(handle)
    window_text.strip! # Remove trailing NULL character
    p window_text unless window_text.empty?
    if !window_text.index(param).nil?
      puts "window was found; handle #{handle}"
      0 # FALSE - stop looking after we find it
      1 # TRUE
    else
      1 # TRUE
    end
  }
  EnumThreadWindows.call(threadId, enumWindowsProc, 'SketchUp')
end

# Takes the first enumerated window for the calling SketchUp thread and fetches
# the root owner which should be the SketchUp window. (Not tested against wxSU)
#
# Is the enum required to get just one window? Any other function to get an
# arbitrary window from the SketchUp thread?
def find_sketchup_window
  threadId = GetCurrentThreadId.call
  hwnd = 0
  enumWindowsProc = Win32;;API;;Callback.new('LP', 'I'){ |handle, param|
    hwnd = GetAncestor.call(handle, GA_ROOTOWNER)
    0
  }
  EnumThreadWindows.call(threadId, enumWindowsProc, 'SketchUp')
  hwnd
end

Remaining issues:

Migrate Win32API to Win32::API for all function calls.
While testing I eventually got an exception that said there was too many callbacks initiated. Seems there might be a limit. I have not looked into this further, but I think once might have to make one callback proc, and then delegate to the appropriate handling method based on param.

thomthom

@unknownuser said:

= Documentation
The source file contains inline RDoc documentation. If you installed
this file as a gem, then you have the docs.

Where do you get the source code?

I tried to install the gem, but got this error:

Jim

It is a c-language based extension, and apparently isn't available already compiled for your platform. So you would need to compile it.

This is the advantage of using the mingw32 Ruby Installer with devkit - it automatically builds native libraries.

Downloads

The easy way to install Ruby on Windows This is a self-contained Windows-based installer that includes the Ruby language, an execution environment, important...

(rubyinstaller.org)