SD card file rename?

Comments

• Mike Green Posts: 23,101

  2007-12-01 17:05 edited 2007-12-01 17:05

  It can't be done without modifying fsrw or Femtofsrw and writing a special routine to do it.
  
  First you have to make sure there isn't a file already with the new name, then you have to
  open the file under the old name, change the directory entry, and write it back. It's not too
  different from deleting a file, but somebody has to do the work.
• Oldbitcollector (Jeff) Posts: 8,091

  2007-12-01 17:20 edited 2007-12-01 17:20

  Why not do this in two steps, and I think they are already there...
  
  First copy the file to the new filename, then delete the old file.
  
  IIRC, there is an example of copy & delete in Femto.
  
  OBC
  
  
  EDIT: yup thought I saw it in there... These could be adapted readily..
  
  Copy
  

                   ' COPY [noparse][[/noparse]<expr>],"<file>" or COPY "<file>",[noparse][[/noparse]<expr>] or
                   ' COPY [noparse][[/noparse]<expr>],[noparse][[/noparse]<expr>] where <expr> are different
                 if spaces == quote
                    scanFileName(@f0)
                    if spaces <> ","
                       abort @syn
                    skipspaces
                    b := getAddress(",") & !$7FFF
                    ifnot fsrw.checkPresence(b)
                       abort string("No EEPROM there")
                    if \fsrw.mount(spiDO,spiClk,spiDI,spiCS) < 0
                       abort string("Can't mount SD card")
                    if \fsrw.popen(@f0,"r")
                       abort string("Can't open file")
                    if fsrw.pread(@f0,32) <> 32
                       abort string("Can't read program")
                    if \fsrw.pclose < 0
                       abort string("Error closing file")
                    \fsrw.unmount
                 else
                    a := getAddress(",") & !$7FFF
                    ifnot fsrw.checkPresence(a)
                       abort string("No EEPROM there")
                    if spaces <> ","
                       abort @syn
                    skipspaces
                    if spaces == quote
                       scanFileName(@f0)
                       if \fsrw.mount(spiDO,spiClk,spiDI,spiCS) < 0
                          abort string("Can't mount SD card")
                       if \fsrw.popen(@f0,"w")
                          abort string("Can't create file")
                       b := 0
                       if \fsrw.pclose < 0
                          abort string("Error closing file")
                       \fsrw.unmount
  
  

  
  
  
  Delete
  

                ' DELETE " <file> "
                 if spaces <> quote
                    abort @syn
                 scanFilename(@f0)
                 if \fsrw.mount(spiDO,spiClk,spiDI,spiCS) < 0
                    abort string("Can't mount SD card")
                 if \fsrw.popen(@f0,"d")
                    abort string("Can't delete file")
                 if \fsrw.pclose < 0
                    abort string("Error deleting file")
                 \fsrw.unmount
  
  

  
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  Post Edited (Oldbitcollector) : 12/1/2007 5:39:21 PM GMT
• Rayman Posts: 15,891

  2007-12-01 17:38 edited 2007-12-01 17:38

  This may be naive, but can't one just change characters in the FAT table?· Aren't all the filenames stored there?
  
  Mike: Is this what you are saying?
• Mike Green Posts: 23,101

  2007-12-01 17:57 edited 2007-12-01 17:57

  Rayman,
  That's essentially what I'm saying. It's just that you have to do it properly with the right error checking.