sizeof() returns "wrong" Size of structure

[tom324]

Try with

#paragma pack(1) (or Intel 8.0 equivalent) directive to have alignment set to 1.

Tom

[Cobi]

Seems to work, thx.
Guess i need to learn my tools

[Mkz]

Just to make sure you know the *reason*:

After "m_uImageType" and before "m_sColorMapStart", the compiler inserted a padding "0", so that the 2-byte-wide "m_sColorMapStart" will be stored at an address which is a multiple of 2. If you had a DWORD, the compiler would pad with zeroes until the address would be a multiple of 4, and so on.

The pragma directive will tell the compiler not to bother aligning the structures.

If you follow the address of each structure member and add the length of the padding zeroes where they are "needed", you'll see that the total length is 20.

[infern0]

Originally Posted by tom324

Try with

#paragma pack(1) (or Intel 8.0 equivalent) directive to have alignment set to 1.

Tom

the best way is:
#pragma pack(push, 1)
struct ...
{};
#pragma pack(pop)

to avoid pack problems with other structures

could be a good reading
http://blogs.msdn.com/larryosterman/archive/2005/04/07/406252.aspx
there is a part 2 too

Originally Posted by infern0

the best way is:
#pragma pack(push, 1)
struct ...
{};
#pragma pack(pop)

to avoid pack problems with other structures

Another way
#include <PshPack1.h>
struct ...
{};
#include <PopPack.h>