Mac/Python/getapplbycreator.c

   1 /***********************************************************
   2 Copyright 1991-1997 by Stichting Mathematisch Centrum, Amsterdam,
   3 The Netherlands.
   4
   5                         All Rights Reserved
   6
   7 Permission to use, copy, modify, and distribute this software and its
   8 documentation for any purpose and without fee is hereby granted,
   9 provided that the above copyright notice appear in all copies and that
  10 both that copyright notice and this permission notice appear in
  11 supporting documentation, and that the names of Stichting Mathematisch
  12 Centrum or CWI or Corporation for National Research Initiatives or
  13 CNRI not be used in advertising or publicity pertaining to
  14 distribution of the software without specific, written prior
  15 permission.
  16
  17 While CWI is the initial source for this software, a modified version
  18 is made available by the Corporation for National Research Initiatives
  19 (CNRI) at the Internet address ftp://ftp.python.org.
  20
  21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
  22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
  23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
  24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
  25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  28 PERFORMANCE OF THIS SOFTWARE.
  29
  30 ******************************************************************/
  31
  32 /*
  33 ** FindApplicationFromCreator uses the Desktop Database to
  34 ** locate the creator application for the given document
  35 **
  36 ** this routine will check the desktop database of all local
  37 ** disks, then the desktop databases of all server volumes
  38 ** (so up to two passes will be made)
  39 **
  40 ** This code was created from FindApplicationFromDocument
  41 ** routine, origin unknown.
  42 */
  43
  44 #ifdef WITHOUT_FRAMEWORKS
  45 #include <Types.h>
  46 #include <Files.h>
  47 #include <Errors.h>
  48 #else
  49 #include <Carbon/Carbon.h>
  50 #endif
  51 #include "getapplbycreator.h"
  52
  53
  54 OSErr FindApplicationFromCreator(OSType creator,
  55         FSSpecPtr applicationFSSpecPtr)
  56 {
  57         enum { localPass, remotePass, donePass } volumePass;
  58         DTPBRec desktopParams;
  59         HParamBlockRec hfsParams;
  60         short volumeIndex;
  61         Boolean foundFlag;
  62         GetVolParmsInfoBuffer volumeInfoBuffer;
  63         OSErr retCode;
  64
  65 /* dkj 12/94 initialize flag to false (thanks to Peter Baral for pointing out this bug) */
  66         foundFlag = false;
  67
  68         volumePass = localPass;
  69         volumeIndex = 0;
  70
  71         do {
  72                                 /*
  73                 ** first, find the vRefNum of the volume whose Desktop Database
  74                 ** we're checking this time
  75                                 */
  76
  77                                 volumeIndex++;
  78
  79                                 /*      convert the volumeIndex into a vRefNum */
  80
  81                                 hfsParams.volumeParam.ioNamePtr = nil;
  82                                 hfsParams.volumeParam.ioVRefNum = 0;
  83                                 hfsParams.volumeParam.ioVolIndex = volumeIndex;
  84                                 retCode = PBHGetVInfoSync(&hfsParams);
  85
  86                                 /* a nsvErr indicates that the current pass is over */
  87                                 if (retCode == nsvErr) goto SkipThisVolume;
  88                                 if (retCode != noErr) goto Bail;
  89
  90                                 /*
  91                                 ** call GetVolParms to determine if this volume is a server
  92                                 ** (a remote volume)
  93                                 */
  94
  95                                 hfsParams.ioParam.ioBuffer = (Ptr) &volumeInfoBuffer;
  96                                 hfsParams.ioParam.ioReqCount = sizeof(GetVolParmsInfoBuffer);
  97                                 retCode = PBHGetVolParmsSync(&hfsParams);
  98                                 if (retCode != noErr) goto Bail;
  99
 100                                 /*
 101                                 ** if the vMServerAdr field of the volume information buffer
 102                                 ** is zero, this is a local volume; skip this volume
 103                                 ** if it's local on a remote pass or remote on a local pass
 104                                 */
 105
 106                                 if ((volumeInfoBuffer.vMServerAdr != 0) !=
 107                                                 (volumePass == remotePass)) goto SkipThisVolume;
 108
 109                                 /* okay, now we've found the vRefNum for our desktop database call */
 110
 111                                 desktopParams.ioVRefNum = hfsParams.volumeParam.ioVRefNum;
 112
 113                                 /*
 114                 ** find the path refNum for the desktop database for
 115                 ** the volume we're interested in
 116                 */
 117
 118                 desktopParams.ioNamePtr = nil;
 119
 120                 retCode = PBDTGetPath(&desktopParams);
 121                 if (retCode == noErr && desktopParams.ioDTRefNum != 0) {
 122
 123                                                 /*
 124                         ** use the GetAPPL call to find the preferred application
 125                         ** for opening any document with this one's creator
 126                         */
 127
 128                         desktopParams.ioIndex = 0;
 129                         desktopParams.ioFileCreator = creator;
 130                         desktopParams.ioNamePtr = applicationFSSpecPtr->name;
 131                         retCode = PBDTGetAPPLSync(&desktopParams);
 132
 133                         if (retCode == noErr) {
 134                                                                 /*
 135                                 ** okay, found it; fill in the application file spec
 136                                 ** and set the flag indicating we're done
 137                                 */
 138
 139                                 applicationFSSpecPtr->parID = desktopParams.ioAPPLParID;
 140                                 applicationFSSpecPtr->vRefNum = desktopParams.ioVRefNum;
 141                                 foundFlag = true;
 142
 143                         }
 144                 }
 145
 146         SkipThisVolume:
 147                                 /*
 148                 ** if retCode indicates a no such volume error or if this
 149                 ** was the first pass, it's time to move on to the next pass
 150                 */
 151
 152                 if (retCode == nsvErr) {
 153                         volumePass++;
 154                         volumeIndex = 0;
 155                 }
 156
 157         } while (foundFlag == false && volumePass != donePass);
 158
 159 Bail:
 160                 if (retCode == nsvErr)
 161                         return fnfErr;          /* More logical than "No such volume" */
 162         return retCode;
 163 }