memodb.c

个人日程管理系统

/******************************************************************************
 *
 * Copyright (c) 1995-1999 Palm Computing, Inc. or its subsidiaries.
 * All rights reserved.
 *
 * File: MemoDB.c
 *
 * Description:
 *		Memo Manager routines
 *
 * History:
 *   	1/3/95	rsf - Created
 *   	9/13/95	mlb - added MemoNewRecord for use by mbs shell command
 *		10/02/99 jmp - Add MemoGetDatabase() routine.
 *
 *****************************************************************************/

#include <PalmOS.h>

#include "MemoDB.h"
#include "MemoMain.h"
#include "progect.h"
#include "progectRsc.h"


/************************************************************
 *
 *  FUNCTION: MemoNewRecord
 *
 *  DESCRIPTION: Create a new record
 *
 *  PARAMETERS: database pointer
 *				database record
 *
 *  RETURNS: zero if successful, errorcode if not
 *
 *  REVISION HISTORY:
 *			Name	Date		Description
 *			----	----		-----------
 *			monty	9/13/95	Initial Revision
 *			lb      9/21/00 mod for progect
 *
 *************************************************************/
Err MemoNewRecord (DmOpenRef dbP, MemoItemPtr item, UInt16 *index)
{
	Err 					result;
	int					size = 0;
	UInt32				offset;
	MemHandle			recordH;	
	MemoDBRecordPtr	recordP, nilP=0;

	// Compute the size of the new memo record.
	// lb : had to add 1 for \0
	size = StrLen (item->note) + 1;
	if (size > memoMaxLength)
	{
		DEBUG1("Memo too big");
		return dmErrMemError;
	}

	//  Allocate a chunk in the database for the new record.
	recordH = (MemHandle)DmNewHandle(dbP, (UInt32) size);
	if (recordH == NULL)
		return dmErrMemError;

	// Pack the the data into the new record.
	recordP = MemHandleLock (recordH);
	offset = (UInt32)&nilP->note;
	DmStrCopy(recordP, offset, item->note);
	
	MemPtrUnlock (recordP);

	// Insert the record.
	result = DmAttachRecord(dbP, index, recordH, 0);
	if (result) 
		MemHandleFree(recordH);
	
	return result;
}


/***********************************************************************
 *
 * FUNCTION:     MemoGetDatabase
 *
 * DESCRIPTION:  Get the application's database.  Open the database if it
 * exists, create it if neccessary.
 *
 * PARAMETERS:   *dbPP - pointer to a database ref (DmOpenRef) to be set
 *					  mode - how to open the database (dmModeReadWrite)
 *
 * RETURNED:     Err - zero if no error, else the error
 *
 * REVISION HISTORY:
 *			Name		Date		Description
 *			----		----		-----------
 *			jmp		10/02/99	Initial Revision
 *
 ***********************************************************************/
Err MemoGetDatabase (DmOpenRef *dbPP, UInt16 mode)
{
	DmOpenRef dbP;

	*dbPP = NULL;
  
  // Find the application's data file.
	dbP = DmOpenDatabaseByTypeCreator (memoDBType, sysFileCMemo, mode);
	if (!dbP)
		{
			DEBUG1("Can't open Memo database");
			return 1;
		}
	
	*dbPP = dbP;
	return 0;
}