I wrote a function to create a file with specified flags:

format PE GUI

include 'win32ax.inc'

OPEN_READWRITE =0x00000002
OPEN_CREATE =0x00000004
OPEN_DELETEONCLOSE =0x00000008
OPEN_SHARE_WRITE =0x00000100

proc testproc filename, flags
locals
dwDesiredAccess dw 0
dwCreationDisposition dw 0
dwShareMode dw 0
dwFlagsAndAttributes dw 0
endl

;Flags And Attributes
xor eax, eax
mov eax, [flags]
and eax, OPEN_DELETEONCLOSE
.if eax=OPEN_DELETEONCLOSE
mov dword [dwFlagsAndAttributes], FILE_ATTRIBUTE_NORMAL or FILE_FLAG_DELETE_ON_CLOSE
.else
mov dword [dwFlagsAndAttributes], FILE_ATTRIBUTE_NORMAL
.endif

;Desired Access
xor eax, eax
mov eax, [flags]
and eax, OPEN_READWRITE
.if eax=OPEN_READWRITE
mov dword [dwDesiredAccess], GENERIC_READ or GENERIC_WRITE
.else
mov dword [dwDesiredAccess], GENERIC_READ
.endif

;Creation Disposition
xor eax, eax
mov eax, [flags]
and eax, OPEN_CREATE
.if eax=OPEN_CREATE
mov dword [dwCreationDisposition], OPEN_ALWAYS
.else
mov dword [dwCreationDisposition], OPEN_EXISTING
.endif

;Share Mode
xor eax, eax
mov eax, [flags]
and eax, OPEN_SHARE_WRITE
.if eax=OPEN_SHARE_WRITE
mov dword [dwShareMode], FILE_SHARE_READ or FILE_SHARE_WRITE
.else
mov dword [dwShareMode], FILE_SHARE_READ
.endif


invoke CreateFileA,[filename],dword [dwDesiredAccess],dword [dwShareMode],0,dword [dwCreationDisposition],dword [dwFlagsAndAttributes],0
ret
endp

section '.code' code readable executable
start:
stdcall testproc, "d:\test1.txt",OPEN_READWRITE or OPEN_CREATE
invoke ExitProcess,0
.end start



it does not work, but if I change the local variable's order:

locals
dwShareMode dw 0
dwDesiredAccess dw 0
dwCreationDisposition dw 0
dwFlagsAndAttributes dw 0
endl


it work well, why? also why I can not check [flags] directly like:.if [flags] and OPEN_SHARE_WRITE ?

You need to define the locals as dwords

Oh, thanks!!!