Revision [17219]

This is an old revision of KeyPgField made by DkLwikki on 2014-08-30 09:53:07.

 

FIELD


Specifies field alignment.

Syntax:
KeyPgType Type|KeyPgUnion Union typename Field = { 1 | 2 | 4 }
...
End KeyPgType Type|KeyPgUnion Union

Description:
Field can be used to pack KeyPgType Types or KeyPgUnion Unions more tightly than DevStructLayout the default layout. The most commonly used value is Field = 1, which causes the Type or Union to be packed as tightly as possible, without any padding bytes being added between the fields or at the end of the Type. Field can only be used to decrease field alignment, but it cannot be used to increase it. In order to add padding bytes, a Union with appropriate members could be used instead.

Examples:
Type bitmap_header Field = 1
    bfType          As UShort
    bfsize          As UInteger
    bfReserved1     As UShort
    bfReserved2     As UShort
    bfOffBits       As UInteger
    biSize          As UInteger
    biWidth         As UInteger
    biHeight        As UInteger
    biPlanes        As UShort
    biBitCount      As UShort
    biCompression   As UInteger
    biSizeImage     As UInteger
    biXPelsPerMeter As UInteger
    biYPelsPerMeter As UInteger
    biClrUsed       As UInteger
    biClrImportant  As UInteger
End Type

Dim bmp_header As bitmap_header

'Open up bmp.bmp and get its header data:
'Note: Will not work without a bmp.bmp to load . . .
Open "bmp.bmp" For Binary As #1

    Get #1, , bmp_header
   
Close #1

Print bmp_header.biWidth, bmp_header.biHeight

Sleep


Dialect Differences:
Differences from QB:

See also:
Back to User Defined Types
Valid XHTML :: Valid CSS: :: Powered by WikkaWiki



sf.net phatcode