/* Gamelon(tm) File I/O Library Sample Code C++ Language */
/* (C)1994 Menai Corporation(tm) Released for public use */
/* Example 9a. How to read the contents of stored objects */
/* when structure of the file is known. */
/* When the program knows the structure of the file, the */
/* program may simply move from object to object within */
/* the file, reading the contents of each object using */
/* datatypespecific read calls. For example, if the */
/* contents of a particular file (or of an aggregate */
/* within a file) are an integer value 14, a character */
/* value 'F' and a string value "Wherefore art thou, */
/* Romeo?", the function calls to read such a file could */
/* be as follows: */
/* Beginning file layout: */
/* { } */
/* [14]['F']["Wherefore art thou, Romeo?"] */
#include <stdlib.h>
#include <iostream.h>
#include "gfcursor.hpp"
int main(void) {
int valid;
short i;
char ch;
char *strptr;
size_t strsize;
CURSOR *c = new CURSOR("newfile");
c>eCursorQueryValid(&valid);
if (!valid)
exit(1);
c>eCursorMoveIn();
c>eObjRead(&i);
c>eCursorMoveNext();
c>eObjRead(&ch);
c>eCursorMoveNext();
c>eObjQueryDataSize(&strsize);
strptr = new char[strsize];
c>eObjRead(strptr, strsize);
cout << "i = " << i << endl;
cout << "ch = " << ch << endl;
cout << "strptr = " << strptr << endl;
delete (strptr);
delete c;
return 0;
}
/* Program output: */
/* i = 14 */
/* ch = F */
/* strptr = Wherefore art thou, Romeo? */
/* The ObjRead functions are overloaded; as a result, */
/* all the ObjRead calls look similar. The parameters */
/* of each function call distinguish the exact */
/* function called to read information from the */
/* object. Note that in order to properly read the */
/* object containing the string value, the programmer */
/* must first query the object for its datasize, in */
/* order to allocate enough memory for the string, or */
/* the programmer can just use a large preallocated */
/* block of memory. The size of the block of memory */
/* is then passed to the ObjRead function. */
Home | Product | Consulting | Programming | Reviews | Company | Site Map | Guest Book
Menai Corporation, 1010 El Camino Real, Suite 300, Menlo Park, California 94025-4335
800-GAMELON (800-426-3566) (US only), 650-853-6450 (voice), 650-853-6453 (fax)
Questions about our products and services: info@menai.com.
Comments about this web site: webmaster@menai.com.
Copyright © 1996-98 Menai Corporation. All Rights Reserved. Menai, Gamelon and gamelon(stylized) are worldwide trademarks of Menai Corporation, registered in the United States of America, and the .[g] logo is a worldwide trademark of Menai Corporation. All other trademarks are owned by their respective owners.