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pedro
Joined: 24 Apr 2009
Posts: 128
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 Posted: Mon Jun 15, 2009 1:19 pm Post subject: Set files Attriutes |
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Hello
In AVR-DOS exists the function GetAttr to read the files Attributes. Is there a possibility to SET with AVR-DOS the Files Attributes?
Thanks
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Sato |
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AdrianJ
Joined: 16 Jan 2006
Posts: 2483
Location: Queensland
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| Posted: Thu Jun 18, 2009 12:08 am Post subject: |
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There is a library call to read the file attribute, but not to write it back, at least I did not find one.
Presumably you only need to protect the file when its in a PC ? If your users are likely to overwrite the file there, then just setting the attribute will not stop them.
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Adrian Jansen
Computer language is a framework for creativity |
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pedro
Joined: 24 Apr 2009
Posts: 128
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| Posted: Thu Jun 18, 2009 10:49 pm Post subject: |
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Hello Adrianj
Not on the PC, i want to change the file atributes on the sd card in my board with Bascom
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Sato |
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AdrianJ
Joined: 16 Jan 2006
Posts: 2483
Location: Queensland
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| Posted: Thu Jun 18, 2009 11:04 pm Post subject: |
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Why precisely do you need to change the attribute at the Bascom end ? You have full control over what is written there, and can avoid an overwrite or delete. In any case I doubt that AVR-DOS respects the attribute, ie I would think that it would happily delete a file even if the read-only bit was set ( but I havent tried it ).
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Adrian Jansen
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pedro
Joined: 24 Apr 2009
Posts: 128
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| Posted: Fri Jun 19, 2009 11:03 am Post subject: |
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Hello Adrianj
The situation is the following: I have a program in the PC that makes in loop a wireless scan of my boards, on that i have a sd card. Everytime in the scan process, the boards send files to the PC.
The reason to want change the files attributes in the sd card is to change it to only read the files that have sucessfull receibed on the PC. Than on next scan process i checked the files attributes and the files that are only read i donīt need to send it again.
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Sato |
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AdrianJ
Joined: 16 Jan 2006
Posts: 2483
Location: Queensland
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| Posted: Sun Jun 21, 2009 8:22 am Post subject: |
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I see. So you are looking at something like the archive attribute. But maybe you could do the same thing by looking at the file date/time. If you keep track of the last date/time the file was transferred, then only send it again if the date/time is changed, that achieves the same result. Maybe not as simple as the archive bit, but it should work.
It might also be worth asking Josef directly whether he has a routine to write to the archive bit. It should not be that difficult to do, just identify the byte in the directory structure, and change the correct bit.
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Adrian Jansen
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pedro
Joined: 24 Apr 2009
Posts: 128
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| Posted: Tue Jun 23, 2009 11:57 am Post subject: |
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Hello Adrianj
Thank You for your great help on this Forum.
Yes, perhaps can Josef do that, than for my purpose there is the easy and best way.
Regards
Pedro |
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oe9vfj
Joined: 17 Jun 2004
Posts: 269
Location: Austria, Hard
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| Posted: Wed Aug 12, 2009 1:28 pm Post subject: |
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Hi Pedro
You can test following function to set the Read-Only Attribut-Bit.
| Code: | Function SetReadAttr(strFileName as String, byval bAttr as Byte) as Byte
_SetReadAttr:
ldd xl, Y+2 ' Pointer to filename to X
ldd xh, Y+3
!call _SearchDirEntry_CheckFileName ' with norming file name and checking wildcard
brcc _SetReadAttr2
' If not Found or other Error leave with Error-code
rjmp _SetReadAttr3
_SetReadAttr2:
ldd xl, Y+0 ' Pointer to new attribut to X
ldd xh, Y+1
ld r25, X ' Attribut Parameter to r25
ldd r24, Z+11 ' file-attribut from directory
bst r25, 0 ' transfer attribut-Bit to
bld r24, 0 ' File Attribut-byte
std Z+11, r24 ' store back to directory
!call _SetDIRWritePending ' set flag to write directory-buffer to disk
!call _SaveSector_DIR ' save Directory-Sector
clr r25 ' Return-Code is 0
_SetReadAttr3:
ldd xl, Y+4 ' Pointer to return-Byte
ldd xh, Y+5
st X, r25 ' Store return-value
End Function |
Somewhere at the top of the program you have to declare the function
| Code: | Function SetReadAttr(strFileName as String, byval bAttr as Byte) as Byte |
you can use the function like this
| Code: | Dim FileName as String * 12
Dim bReturn as Byte
FileName = "Test.txt"
bReturn = SetReadAttr ( FileName, 1) ' Set Read Only to 1
bReturn = SetReadAttr ( FileName, 0) ' set Read Only to 0 (Write allowed) |
The return-value is the error-code of AVR-DOS. IF 0, setting of the read-only attribut bit was OK, if > 0, there was an error, check the AVR-DOS Error-Code.
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regards Josef
DOS - File System for BASCOM-AVR on http://members.aon.at/voegel |
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pedro
Joined: 24 Apr 2009
Posts: 128
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| Posted: Mon Aug 17, 2009 5:06 pm Post subject: |
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Hello Josef
Thanks again for Your help.
I will test it the next days, and send Feedback
Regards
Pedro |
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