Peter,

Usually constants are written out like that so that it's clear which bit is which. Especially across constants that use more than 8 bits, like those for the Messagebox third parameter. Or these:

#define CDS_UPDATEREGISTRY  0x00000001
#define CDS_TEST            0x00000002
#define CDS_FULLSCREEN      0x00000004
#define CDS_GLOBAL          0x00000008
#define CDS_SET_PRIMARY     0x00000010
#define CDS_NORESET         0x10000000
#define CDS_SETRECT         0x20000000
#define CDS_RESET           0x40000000

>

? 0x00000001
>? 0x00001
>? 0x01
>? 0x1

>
>All are 1. However, in the next piece of code the declaration is 0x00000001. Can anyone tell me why? Will 0x1 not do the job?
>
>

#define FILE_ATTRIBUTE_READONLY    0x00000001
>#define FILE_ATTRIBUTE_HIDDEN      0x00000002
>#define FILE_ATTRIBUTE_SYSTEM      0x00000004