On Tuesday, November 26, 2013 2:13:57 PM UTC-8, [email protected] wrote:
> I am currently using Windows 7 Sp1, Tkinter 8.5, Python 2.7.4 on a laptop
> with no attached monitor. I am attempting to use winfo_screenmmwidth, but the
> returned value is incorrect. Specs state 280 mm. Physical measurement is 275
> mm. EDID states 280 mm. Tkinter's winfo_screenmmwidth returns 361 mm. I don't
> have very much tkinter experience, please bear with me.
>
>
>
> From where does winfo_screenmmheight get this information? I have looked
> through the source code and can't really find the source. The source code
> seems to lead to WidthMMOfScreen(Screen(tkwin)) in both tkGet.c and tkObj.c.
> Xlib.h defines the Screen structure which has mwidth defined in it. Xlib.h
> also defines WidthMMOfScreen as a macro "#define WidthMMOfScreen(s)
> ((s)->mwidth)" The X Window System Protocol:8 Connection Setup:Screen
> Information states "Width-in-millimeters and height-in-millimeters can be
> used to determine the physical size and the aspect ratio," but I'm not sure
> where the code is for the request.
>
>
>
> So that's where I stopped on the X Windows side of things. I think I need to
> look at the source code for _tkinter.lib, but I'm not sure. I downloaded and
> started to look at the pywin32.exe (win32all) source code, but I'm not sure
> where to start with that either. I was expecting to see an entry which
> returns the EDID information, but I have not seen that yet.
>
>
>
> Could somebody point me in the right direction? Or does anyone have any ideas?
>
>
>
> Thank you in advance.
I wrote this to extract the EDID information. It's not very robust and for some
reason not all of the subkeys are iterated in a sub key. I also haven't gotten
a response from the tcl/tk folks yet.
import _winreg
def screen_wh():
"""Input - none
Output - Screen's physical (width, height)"""
hive = _winreg.HKEY_LOCAL_MACHINE
path = "SYSTEM\\CurrentControlSet\\Enum\\DISPLAY"
number = 0
rtpath = None
def search_subkeys(hive, path, number, rtpath):
number = number + 1
key = _winreg.OpenKey(hive, path, 0, _winreg.KEY_READ)
try:
i = 0
while 1:
name = _winreg.EnumKey(key, i)
#print(" "*number + name, i) #Used to view registry path
#for some reason this does not iterate over all registry keys
crappy fix
if i == 2:
try:
#This works with a direct call, but it's not very
portable.
name2 = _winreg.EnumKey(key, 3)
if name2 == "Control":
rtpath = path
except WindowsError:
pass
if rtpath == None:
rtpath = search_subkeys(hive, path+"\\"+name, number,
rtpath)
i += 1
except WindowsError:
pass
return(rtpath)
monitor = search_subkeys(hive,path, number,rtpath)
print("EDID registry path: {0}".format(monitor))
key = _winreg.OpenKey(hive, monitor+"\\Device Parameters")
try:
i = 0
while 1:
name, data, type = _winreg.EnumValue(key, i)
if name == 'EDID':
break
except WindowsError:
"EDID not found"
width = int(data[21].encode('hex'),16) * 10
height = int(data[22].encode('hex'),16) * 10
print("Width: {0} mm\nHeight: {1} mm".format(width,height))
return((width, height))
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