[C\C++] SketchUp window handle

thomthom

Here's a stack overflow thread I made earlier trying to work out how to get the window handle: http://stackoverflow.com/questions/4548354/win32-can-one-enumerate-the-windows-belonging-to-the-calling-thread

I've not implemented it yet though.

Dan Rathbun

a note that on the C side of things, the constant NULL is set to the integer 0, which is what C will return for many Win API functions that are unsuccessful.

Win32API.so I don't think converts a C NULL into a Ruby nil

thomthom

@dan rathbun said:

Win32API.so I don't think converts a C NULL into a Ruby nil

You're right. That was a wee bug in my code there. I compare against 0 elsewhere. Thanks for spotting that.

tomasz

I have succeeded to find SU hwnd in a following way (pseudo-Ruby \ C++ code):


		curr_proc_id = GetCurrentProcessId();
		h = GetTopWindow(0);
		while ( h )
		{
				 pid=GetWindowThreadProcessId( h );
				 if ( pid == curr_proc_id )
				 {
					class_name=GetClassName( h );
					if (class_name[0..2]=='Afx' && class_name[13]=='b') su_hwnd=h;
				 }
				h = GetNextWindow( h );
		}
		return su_hwnd;

p.s. I am a spoiled child. I want my Ruby back!!! I hate defining almost every single byte in memory!

Mac OSX now...

Dan Rathbun

The current pid in Ruby is the global $$, or a call to: Process.pid()

thomthom

GetTopWindow(0)

What does this actually do?

tomasz

@thomthom said:

GetTopWindow(0)

What does this actually do?

It gets "top most" window.

@unknownuser said:

If this parameter is NULL (0), the function returns a handle to the window at the top of the Z order.

The z-order of a window indicates the window's position in a stack of overlapping windows. This window stack is oriented along an imaginary axis, the z-axis, extending outward from the screen. The window at the top of the z-order overlaps all other windows. The window at the bottom of the z-order is overlapped by all other windows.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms633514(v=vs.85).aspx

GetNextWindow
gets a window beneath.. till all windows examined.

thomthom

How fast is it to search through all the windows and do string comparison?

tomasz

@thomthom said:

How fast is it to search through all the windows and do string comparison?

I haven't learned yet how to measure time in C (whole function is written in C), but I guess it is very fast.

thomthom

Here's a way that doesn't iterate every windows there is. It enumerates the windows of the calling thread. Cuts down the searching and ensure that you don't get the wrong window.

win32_sketchup_window.rb