/* Gamelon(tm) File I/O Library Sample Code C Language */
/* (C)1994 Menai Corporation(tm) Released for public use */
/* Example 2b. How to put a series of objects into an */
/* empty aggregate using the PostLast position. */
/* The PostLast position is defined to be after the */
/* last object within the immediately enclosing */
/* aggregate. If the aggregate is empty, PostLast is */
/* defined to be after any potential position of */
/* objects contained within the aggregate. PostLast */
/* is shown graphically as: */
/* { } */
/* > */
/* Normally, PostLast is only shown when one or more */
/* Cursors are actually in the PostLast position. */
/* When in the PostLast position, a cursor may only */
/* insert objects before its current position. */
/* Append, Replace, Remove and Modify alterations are */
/* not possible from the PostLast position. The */
/* following API calls may be used to add a series of */
/* data objects from the PostLast position (assume an */
/* empty file): */
#include <stdlib.h>
#include "gfcursor.h"
int main(void) {
short i = 2;
char ch = 'b';
double db = 3.14159;
int valid;
CURSOR *c = new_CURSOR(NULL,
"newfile",
AM_SHARED,
NULL,
0);
eCursorQueryValid(c, &valid);
if (!valid)
exit(1);
eCursorMoveIn(c);
/* Since aggregate is empty, Cursor moves to the */
/* Null position. Cursor must move to PreFirst or */
/* PostLast in order to make alterations. */
eCursorMovePostLast(c);
eAltInsert(c);
eObjWriteShort(c, i);
eAltInsert(c);
eObjWriteChar(c, ch);
eAltInsert(c);
eObjWriteDouble(c, db);
delete_CURSOR(c);
return 0;
}
/* Ending file layout: */
/* { } */
/* [2]['b'][3.14159] */
/* Note that the each Insert alteration placed the */
/* object in the location immediately before the */
/* PostLast position (resulting in the objects being */
/* ordered in the exact same order as the order in */
/* which they were written). */
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