/* Gamelon(tm) File I/O Library Sample Code  C++ Language */

/* (C)1994 Menai Corporation(tm)  Released for public use */

 

/* Example 5c. Modifying the contents of an aggregate  */

/* object.                                             */

 

/* Much like the value of a data object, the contents  */

/* of an aggregate can be changed during a Modify      */

/* alteration on the aggregate. In order to perform    */

/* the modification, the new objects to be added to    */

/* the aggregate must be added using a block           */

/* aggregating alteration. For example:                */

 

/* Beginning file layout:     */

/* {                                      }  */

/*   [2]{                }[3.14159]   */

/*        [5700304]             */

 

#include <stdlib.h>

#include "gfcursor.hpp"

 

int main(void) {

char stringval[20] = "Carpe Diem.";

char newchar = 'u';

int valid;

CURSOR *c = new CURSOR("newfile");

c>eCursorQueryValid(&valid);

if (!valid)

exit(1);

c>eCursorMoveIn();

c>eCursorMoveNext();

c>eAltModify();

c>eAltStartAggregating();

c>eObjWrite(stringval);

c>eObjWrite(newchar);

c>eAltCommit();

delete c;

return 0;

}

 

/* Ending file layout:               */

/*  {                                                     } */

/*    [2]{                              }[3.14159]  */

/*         ["Carpe Diem."]['u']                   */

 

/* Notice that when new contents are specified for an  */

/* aggregate being modified, all the existing contents */

/* are removed, including all aggregates nested within */

/* the aggregate being modified. This is a very        */

/* powerful feature and should be used with caution.   */

Download this sample source code

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