Sorry I can't type Chinese currently...
First of all, you have to understand when we're talking about the SIZE of a monitor, we're ACTUALLY talking about the MAX viewable image size of a monitor, or "
diameter".
I have to say, due to no direct info about diameter is provided, it's not easy to get the diameter of your monitor without the help of a 3rd party tool.
(BTW, the resolution is easy to get, however it can't be used to calculate the diameter of your monitor.)
Recently in a computer, all info about the monitor come from
EDID(a VESA defined data structure, for detail:
http://en.wikipedia.org/wiki/EDID). EDID BYTE 21 and BYTE 22 define the horizontal/vertical MAX viewable image size, separately.
You could get EDID via I2C, perform a calculation with EDID BYTE 21 and BYTE 22, and a conversion from centimeter to inch, the result you get is very close to the desired monitor-size.
Another approach is much easier: by the name of the monitor, like "DELL E228WFP" indicating 22-inch. However even if you could get the name from EDID or Windows Registry, this isn't a reliable approach for 2 reasons.
1st reason: NOT all monitor names reflect the sizes, like "EPI EnVision EN-775e", what the hell is this size?
2nd reason: It's NOT easy to parse the name. Every naming convention differs among monitor vendors.
Best way:
You could use this tool:
http://www.nirsoft.net/utils/dumpedid.zip (for Windows ONLY) to get EDID and diameter.
usage: DumpEDID.exe > YourFile.txt
or: DumpEDID.exe \\remote01 > YourFile.txt
Here's a typical output by DumpEDID.exe:
(NOTICE the text in RED)
************************************************************
Registry Key : DISPLAY\DELD015\5&1f944c2&0&UID16777488
Monitor Name : DELL E228WFP
Serial Number : PN38083P0SVM
Manufacture Week : 13 / 2008
ManufacturerID : 44048 (0xAC10)
ProductID : 53269 (0xD015)
Serial Number (Numeric) : 810767949 (0x3053564D)
EDID Version : 1.3
Display Gamma : 2.20
Vertical Frequency : 56 - 75 Hz
Horizontal Frequency : 30 - 83 KHz
Image Size : 47.3 X 29.6 cm (22.0 Inch)
Maximum Image Size : 47 X 30 cm (22.0 Inch)
Maximum Resolution : 1280 X 1024
Support Standby Mode : Yes
Support Suspend Mode : Yes
Support Low-Power Mode : Yes
Support Default GTF : No
Digital : Yes
Supported Display Modes :
720 X 400 70 Hz
640 X 480 60 Hz
640 X 480 75 Hz
800 X 600 60 Hz
800 X 600 75 Hz
1024 X 768 60 Hz
1024 X 768 75 Hz
1280 X 1024 75 Hz
1152 X 864 75 Hz
1280 X 1024 60 Hz
************************************************************
Sometimes we'll get diameters like 18.9 Inch or 17.1 Inch. It's not a big problem, I believe you know the right thing to do. ^ _ ^.
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Last edited by azziporah on 2009-12-2 at 08:59 ]
