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| Why is MQOD structure different length in 64 bit? |
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| markneil |
 Posted: Fri Nov 21, 2008 9:58 am Post subject: Why is MQOD structure different length in 64 bit? |
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Apprentice
Joined: 09 Sep 2003
Posts: 26
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In the cmqc.h file, the MQOD structure is defined as different lengths depending on whether it is 32 or 64 bit platform. Why is this?
I don't have an issue...just trying to understand.
thanks
Mark
/****************************************************************/
/* Values Related to MQOD Structure */
/****************************************************************/
/* Structure Identifier */
#define MQOD_STRUC_ID "OD "
/* Structure Identifier (array form) */
#define MQOD_STRUC_ID_ARRAY 'O','D',' ',' '
/* Structure Version Number */
#define MQOD_VERSION_1 1
#define MQOD_VERSION_2 2
#define MQOD_VERSION_3 3
#define MQOD_CURRENT_VERSION 3
/* Structure Length */
#if defined(MQ_64_BIT)
#define MQOD_CURRENT_LENGTH 344
#else
#define MQOD_CURRENT_LENGTH 336
#endif
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| fjb_saper |
| Posted: Fri Nov 21, 2008 10:01 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Possibly because the length of such things as integer is different on 64 bit platform? 
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| markneil |
| Posted: Fri Nov 21, 2008 10:07 am Post subject: |
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Apprentice
Joined: 09 Sep 2003
Posts: 26
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Possibly, but MQLONG on 32 bit is defined as 'long' and on 64 bit as 'int'. Aren't these equivenent?
It does seem a coincidence that there are 8 MQLONG fields in the structure, and the 64 bit version is 8 bytes longer. But I'd like to unbderstand why  |
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| markt |
| Posted: Fri Nov 21, 2008 10:11 am Post subject: |
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Knight
Joined: 14 May 2002
Posts: 508
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MQPTR ObjectRecPtr;
MQPTR ResponseRecPtr; |
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| markneil |
| Posted: Fri Nov 21, 2008 10:47 am Post subject: |
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Apprentice
Joined: 09 Sep 2003
Posts: 26
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Ah...of course.
Thank you.
Good weekend. |
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