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"Should be zero" assuming appropriate endianess.

Jamie
– Jamie

2010-08-07 01:05:07 +00:00
Commented Aug 7, 2010 at 1:05
No, "should be zero" meaning that he explicitly said ContentID=0 in the example, and given that the second piece of code ANDs the result with 0x7ff, it looks like he's going for ContentID.

EboMike
– EboMike

2010-08-07 01:08:51 +00:00
Commented Aug 7, 2010 at 1:08
Why define an intermediate pointer to SysData ? Just read MsgHdr.SystemID or MsgHdr.ContentID as needed.

kriss
– kriss

2010-08-07 01:16:34 +00:00
Commented Aug 7, 2010 at 1:16
Depends on what type MsgHdr is - My guess was that the second code block read a data stream, and MsgHdr was a pointer to raw data or something. I have no explanation why else he would go through the complicated way of extracting the information via bit-shifts rather than just reading the members directly.

EboMike
– EboMike

2010-08-07 01:19:24 +00:00
Commented Aug 7, 2010 at 1:19
Your guess may be right or it could be some newbie error. I don't understand either why he is doing things that way. The question probably need some more details (and fully working code sample instead of fragments would also be cool).

kriss
– kriss

2010-08-07 01:31:52 +00:00
Commented Aug 7, 2010 at 1:31

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