| """Mac-only module to find the home file of a resource.""" |
| |
| import sstruct |
| import array |
| import calldll |
| import macfs, Res |
| |
| |
| def HomeResFile(res): |
| """Return a path to the file in which resource 'res' lives.""" |
| return GetFileLocation(res.HomeResFile()) |
| |
| |
| def GetFileLocation(refNum): |
| """Return a path to the open file identified with refNum.""" |
| pb = ParamBlock(refNum) |
| return pb.getPath() |
| |
| # |
| # Internal cruft, adapted from MoreFiles |
| # |
| |
| _InterfaceLib = calldll.getlibrary("InterfaceLib") |
| GetVRefNum = calldll.newcall(_InterfaceLib.GetVRefNum, "None", "InShort", "OutShort") |
| _getInfo = calldll.newcall(_InterfaceLib.PBGetFCBInfoSync, "Short", "InLong") |
| |
| |
| _FCBPBFormat = """ |
| qLink: l |
| qType: h |
| ioTrap: h |
| ioCmdAddr: l |
| ioCompletion: l |
| ioResult: h |
| ioNamePtr: l |
| ioVRefNum: h |
| ioRefNum: h |
| filler: h |
| ioFCBIndx: h |
| filler1: h |
| ioFCBFINm: l |
| ioFCBFlags: h |
| ioFCBStBlk: h |
| ioFCBEOF: l |
| ioFCBPLen: l |
| ioFCBCrPs: l |
| ioFCBVRefNum: h |
| ioFCBClpSiz: l |
| ioFCBParID: l |
| """ |
| |
| class ParamBlock: |
| |
| """Wrapper for the very low level FCBPB record.""" |
| |
| def __init__(self, refNum): |
| self.__fileName = array.array("c", "\0" * 64) |
| sstruct.unpack(_FCBPBFormat, |
| "\0" * sstruct.calcsize(_FCBPBFormat), self) |
| self.ioNamePtr = self.__fileName.buffer_info()[0] |
| self.ioRefNum = refNum |
| self.ioVRefNum = GetVRefNum(refNum) |
| self.__haveInfo = 0 |
| |
| def getInfo(self): |
| if self.__haveInfo: |
| return |
| data = sstruct.pack(_FCBPBFormat, self) |
| buf = array.array("c", data) |
| ptr = buf.buffer_info()[0] |
| err = _getInfo(ptr) |
| if err: |
| raise Res.Error, ("can't get file info", err) |
| sstruct.unpack(_FCBPBFormat, buf.tostring(), self) |
| self.__haveInfo = 1 |
| |
| def getFileName(self): |
| self.getInfo() |
| data = self.__fileName.tostring() |
| return data[1:ord(data[0])+1] |
| |
| def getFSSpec(self): |
| self.getInfo() |
| vRefNum = self.ioVRefNum |
| parID = self.ioFCBParID |
| return macfs.FSSpec((vRefNum, parID, self.getFileName())) |
| |
| def getPath(self): |
| return self.getFSSpec().as_pathname() |
| |
| |
| if __name__ == "__main__": |
| fond = Res.GetNamedResource("FOND", "Helvetica") |
| print HomeResFile(fond) |
