type conversion

[JasBascom]

if i have an ifstream object

ifstream validdata;
const int list = 5;
Allrecords books;
Allrecords *rec = books

• ;
  
  if i had the following code
  
  validdata.seekg(0, ios::end);
  filesize = validdata.tellg();
  validdata.seekg(offset, ios::beg);
  
  reccount = filesize/sizeof(Allrecords);
  rec = new(Allrecords[reccount]);
  
  validdata.read((char*) rec, filesize);
  
  
  the last line is causing a debug assertion error. without this line the code
  executes ok. What I would like to know is there another way of reading a union,
  using the read function. Or a type conversion for (char*)

 

[Victor Bazarov]

if i have an ifstream object

ifstream validdata;
const int list = 5;
Allrecords books;
Allrecords *rec = books

• ;
  
  if i had the following code
  
  validdata.seekg(0, ios::end);
  filesize = validdata.tellg();
  validdata.seekg(offset, ios::beg);
  
  reccount = filesize/sizeof(Allrecords);
  rec = new(Allrecords[reccount]);

• 
  
  Did you mean to say
  
  rec = new Allrecords[reccount];
  
  ?
  

  validdata.read((char*) rec, filesize);
  
  
  the last line is causing a debug assertion error. without this line the code
  executes ok. What I would like to know is there another way of reading a union,
  using the read function. Or a type conversion for (char*)

  
  What's "Allrecords"? How come its operator[] returns a pointer
  to an object of the same type? This is highly unusual. And
  just like many times before, with such fragment of a program it
  is generally not possible to recommend anything. Try to follow
  the guidelines given in FAQ 5.8.
  
  Victor

 

[Jonathan Turkanis]

if i have an ifstream object

ifstream validdata;
const int list = 5;
Allrecords books;
Allrecords *rec = books

• ;
  
  if i had the following code
  
  validdata.seekg(0, ios::end);
  filesize = validdata.tellg();
  validdata.seekg(offset, ios::beg);
  
  reccount = filesize/sizeof(Allrecords);
  rec = new(Allrecords[reccount]);
  
  validdata.read((char*) rec, filesize);
  
  
  the last line is causing a debug assertion error. without this line the code
  executes ok. What I would like to know is there another way of reading a union,
  using the read function. Or a type conversion for (char*)

• 
  
  It looks like you're code is probably doing something nasty. This
  "Allrecords *rec" has figured in several recent messages, all rather
  crytpic. It would help to see the actual definition of Allrecords
  (make it as short as possible for demonstration purposes.)
  
  Jonathan

 

[John Harrison]

if i have an ifstream object

ifstream validdata;
const int list = 5;
Allrecords books;
Allrecords *rec = books

• ;

• 
  
  Huh? What does the above line mean?
  

  if i had the following code
  
  validdata.seekg(0, ios::end);
  filesize = validdata.tellg();
  validdata.seekg(offset, ios::beg);
  
  reccount = filesize/sizeof(Allrecords);
  rec = new(Allrecords[reccount]);
  
  validdata.read((char*) rec, filesize);
  
  
  the last line is causing a debug assertion error. without this line the code
  executes ok. What I would like to know is there another way of reading a union,
  using the read function. Or a type conversion for (char*)

  
  No, you are doing it the right way, the problem must be somewhere else in
  your code.
  
  I have explained this twice before, you are trying to write too much
  untested code, so when a problem occurs you have no idea where the problem
  actually is. If you just wrote a few lines at a time and spent a little time
  to make absolutely sure that they were working before you wrote any more
  code, then you wouldn't be running into these problems.
  
  Since I doubt you are going to change your approach at this late stage (but
  hopefully you will for the next program you write) why not post the entire
  program, hopefully someone will take a look and at least get you past the
  debug assertion error.
  
  john

 

[Jonathan Turkanis]

It looks like you're code is probably doing something nasty. This

Ughh! I mean 'your'

It's hard to believe that English is my first language!

Jonathan

 

[David Harmon]

Allrecords *rec = books

• ;

• 
  
  Stop using pointers!!!
  
  
  
  (until you get to something where you absolutely need them.)