cpython/Mac/Python/getapplbycreator.c

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/*
** FindApplicationFromCreator uses the Desktop Database to
** locate the creator application for the given document
**
** this routine will check the desktop database of all local
** disks, then the desktop databases of all server volumes
** (so up to two passes will be made)
**
** This code was created from FindApplicationFromDocument
** routine, origin unknown.
*/
#include <Types.h>
#include <Files.h>
#include <Errors.h>
#include "getapplbycreator.h"
OSErr FindApplicationFromCreator(OSType creator,
FSSpecPtr applicationFSSpecPtr)
{
enum { localPass, remotePass, donePass } volumePass;
DTPBRec desktopParams;
HParamBlockRec hfsParams;
short volumeIndex;
Boolean foundFlag;
GetVolParmsInfoBuffer volumeInfoBuffer;
OSErr retCode;
/* dkj 12/94 initialize flag to false (thanks to Peter Baral for pointing out this bug) */
foundFlag = false;
volumePass = localPass;
volumeIndex = 0;
do {
/*
** first, find the vRefNum of the volume whose Desktop Database
** we're checking this time
*/
volumeIndex++;
/* convert the volumeIndex into a vRefNum */
hfsParams.volumeParam.ioNamePtr = nil;
hfsParams.volumeParam.ioVRefNum = 0;
hfsParams.volumeParam.ioVolIndex = volumeIndex;
retCode = PBHGetVInfoSync(&hfsParams);
/* a nsvErr indicates that the current pass is over */
if (retCode == nsvErr) goto SkipThisVolume;
if (retCode != noErr) goto Bail;
/*
** call GetVolParms to determine if this volume is a server
** (a remote volume)
*/
hfsParams.ioParam.ioBuffer = (Ptr) &volumeInfoBuffer;
hfsParams.ioParam.ioReqCount = sizeof(GetVolParmsInfoBuffer);
retCode = PBHGetVolParmsSync(&hfsParams);
if (retCode != noErr) goto Bail;
/*
** if the vMServerAdr field of the volume information buffer
** is zero, this is a local volume; skip this volume
** if it's local on a remote pass or remote on a local pass
*/
if ((volumeInfoBuffer.vMServerAdr != 0) !=
(volumePass == remotePass)) goto SkipThisVolume;
/* okay, now we've found the vRefNum for our desktop database call */
desktopParams.ioVRefNum = hfsParams.volumeParam.ioVRefNum;
/*
** find the path refNum for the desktop database for
** the volume we're interested in
*/
desktopParams.ioNamePtr = nil;
retCode = PBDTGetPath(&desktopParams);
if (retCode == noErr && desktopParams.ioDTRefNum != 0) {
/*
** use the GetAPPL call to find the preferred application
** for opening any document with this one's creator
*/
desktopParams.ioIndex = 0;
desktopParams.ioFileCreator = creator;
desktopParams.ioNamePtr = applicationFSSpecPtr->name;
retCode = PBDTGetAPPLSync(&desktopParams);
if (retCode == noErr) {
/*
** okay, found it; fill in the application file spec
** and set the flag indicating we're done
*/
applicationFSSpecPtr->parID = desktopParams.ioAPPLParID;
applicationFSSpecPtr->vRefNum = desktopParams.ioVRefNum;
foundFlag = true;
}
}
SkipThisVolume:
/*
** if retCode indicates a no such volume error or if this
** was the first pass, it's time to move on to the next pass
*/
if (retCode == nsvErr) {
volumePass++;
volumeIndex = 0;
}
} while (foundFlag == false && volumePass != donePass);
Bail:
if (retCode == nsvErr)
return fnfErr; /* More logical than "No such volume" */
return retCode;
}