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WDPBRec |
Header: Files.h |
struct WDPBRec { QElemPtr qLink; SInt16 qType; SInt16 ioTrap; Ptr ioCmdAddr; IOCompletionUPP ioCompletion; volatile OSErr ioResult; StringPtr ioNamePtr; SInt16 ioVRefNum; SInt16 filler1; SInt16 ioWDIndex; SInt32 ioWDProcID; SInt16 ioWDVRefNum; SInt16 filler2[7]; SInt32 ioWDDirID; }; typedef WDPBRec WDPBPtr;
A pointer to the next entry in the file I/O queue. (This field is used internally by the File Manager to keep track of asynchronous calls awaiting execution.)
The queue type. (This field is used internally by the File Manager.)
The trap number of the function that was called. (This field is used internally by the File Manager.)
The address of the function that was called. (This field is used internally by the File Manager.)
A pointer to a completion routine to be executed at the end of an asynchronous call. It should be NULL for asynchronous calls with no completion routine and is automatically set to NULL for all synchronous calls. See IOCompletionProcPtr for information about completion routines.
The result code of the function. For synchronous calls, this field is the same as the result code of the function call itself. To determine when an asynchronous call has actually been completed, your application can poll this field; its set to a positive number when the call is made and receives the actual result code when the call is completed.
A pointer to a pathname. Whenever a function description specifies that ioNamePtr is usedwhether for input, output, or bothits very important that you set this field to point to storage for a Str255 value (if youre using a pathname) or to NULL (if youre not).
A volume specification (volume reference number, working directory reference number, drive number, or 0 for default volume).
Reserved.
An index for use with the PBGetWDInfo function.
An identifier thats used to distinguish between working directories set up by different users; you should set ioWDProcID to your applications signature.
The working directorys volume reference number.
Reserved.
The working directorys directory ID.
The low-level HFS functions PBOpenWD, PBCloseWD, and PBGetWDInfo use the working directory parameter block defined by the WDPBRec data type.
© 2000 Apple Computer, Inc. (Last Updated 6/30/2000)