/* Gamelon(tm) File I/O Library Sample Code C Language */
/* (C)1994 Menai Corporation(tm) Released for public use */
/* Example 5a. How to modify an existing data object. */
/* The Modify alteration allows the programmer to change */
/* the data within an object without changing the object */
/* itself. However, the Modify alteration cannot change */
/* the type of the data, only the value. For example: */
/* Beginning file layout: */
/* { } */
/* [2]['b'][3.14159] */
#include <stdlib.h>
#include "gfcursor.h"
int main(void) {
char newchar = 'u';
int valid;
CURSOR *c = new_CURSOR(NULL,
"newfile",
AM_SHARED,
NULL,
0);
eCursorQueryValid(c, &valid);
if (!valid)
exit(1);
eCursorMoveIn(c);
eCursorMoveNext(c, OT_OBJ);
eAltModify(c);
eObjWriteChar(c, newchar);
delete_CURSOR(c);
return 0;
}
/* Ending file layout: */
/* { } */
/* [2]['u'][3.14159] */
/* In this case, the character value in object 2. was */
/* changed from 'b' to 'u'. Since both values are */
/* character values, the Modify alteration can be */
/* used. If the new value were an integer, the Modify */
/* alteration could not be used; the programmer would */
/* have had to perform a Replace alteration, changing */
/* not only the value of the object but the entire */
/* object itself. */
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