How to read the model of monitor from the EDID?

Question

In the registry there is one (or more) key depending how many monitors you have HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAY\DEL404C{Some Unique ID}\Device Parameters\EDID which is a REG_BINARY key. In my case this is :

00 ff ff ff ff ff ff 00 4c 2d 6f 03 39 31 59 4d 
07 12 01 03 0e 29 1a 78 2a 80 c5 a6 57 49 9b 23 
12 50 54 bf ef 80 95 00 95 0f 81 80 81 40 71 4f 
01 01 01 01 01 01 9a 29 a0 d0 51 84 22 30 50 98 
36 00 ac ff 10 00 00 1c 00 00 00 fd 00 38 4b 1e 
51 0e 00 0a 20 20 20 20 20 20 00 00 00 fc 00 53 
79 6e 63 4d 61 73 74 65 72 0a 20 20 00 00 00 ff 
00 48 56 44 51 32 30 36 37 37 37 0a 20 20 00 ef 

My question is how can I read only model of monitor ("SyncMaster" for example) and not all of the information using C or C++?

The format of EDID is described here: http://en.wikipedia.org/wiki/Extended_display_identification_data

Answer 1

What you're interested in here is the descriptor blocks of the EDID, which are found in the byte ranges 54-71, 72-89, 90-107, and 108-125. Here's those four blocks in your EDID:

#1: 9a29 a0d0 5184 2230 5098 3600 acff 1000 00
#2: 0000 00fd 0038 4b1e 510e 000a 2020 2020 20
#3: 0000 00fc 0053 796e 634d 6173 7465 720a 20
#4: 0000 00ff 0048 5644 5132 3036 3737 370a 00

You can identify the descriptor containing the monitor name because the first three bytes are all zero (so it isn't a detailed timing descriptor), and the fourth one byte FC (indicating the type). The fifth byte and beyond contain the name, which is here:

5379 6e63 4d61 7374 6572 0a20    SyncMaster..

So, in short: Check at offsets 54, 72, 90, and 108 for the sequence 00 00 00 FC; if you find a match, the monitor name is the next 12 bytes.