/* Gamelon(tm) File I/O Library Sample Code C Language */
/* (C)1994 Menai Corporation(tm) Released for public use */
/* Example 2c. How to put a series of objects into an */
/* empty aggregate by performing a Modify alteration */
/* on the aggregate. */
/* Performing a Modify alteration on an aggregate */
/* allows the programmer to change the contents of */
/* the aggregate while staying at the level of the */
/* aggregate itself. The Cursor does not have to move */
/* into the aggregate in order to add new objects to */
/* the aggregate. Instead, the programmer simply */
/* uses a block aggregating Modify alteration to */
/* collect the new objects into the aggregate (assume */
/* the file has no contents): */
#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);
eAltModify(c);
eAltStartAggregating(c); /* Start Aggregating */
eObjWriteShort(c, i);
eObjWriteChar(c, ch);
eObjWriteDouble(c, db);
eAltCommit(c); /* End Aggregating */
delete_CURSOR(c);
return 0;
}
/* Ending file layout: */
/* { } */
/* [2]['b'][3.14159] */
/* Note that the objects within the aggregate are */
/* placed in the order written. This particular type */
/* of modification is very powerful and will be */
/* revisited in a later example. If the aggregate */
/* had contained objects to begin with, all the */
/* existing objects would have been removed as the */
/* new contents of the aggregate were specified. */
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