Fstream binary read write and type

Geez, I thought this was probably an easy thing, just a simple command in linux that would do the trick

Fstream binary read write and type

fstream binary read write and type

I first started off reading the guide here http: However whilst it contains what appears to be a good example of how to use readit does not contain an example of how to use write. I first attempted to store a simple char array in binary using write. My original idea and hope was that I could append to this file with new entries using ios:: Originally this appeared to work, but I was getting junk output as well.

A post on another forum for help suggested I lacked a null terminator on the end of my char array. I applied this or at least attempted to based on how I was shown as can be seen in the example below.

How do I proceed then? The code below includes various commented out lines of code indicating various attempts I have made and different variations, including some of the suggestions I mentioned above. I would also like to clarify that I am trying to write chars here for testing purposes only, so please do not suggest that I should write in text mode rather than binary mode instead.

What I am actually trying to do is write an object of a custom class to a file, then read it back out again intact. With those member variables commented out the access violation does not occur.

My best guess as to why this happens is that They use pointers to other pieces of memory to store their files, and I am not writing the data itself to my file but the pointers to it, which happen to still be valid when I read my data out.

Is it possible at all to store the contents of these more complex datatypes in a file? Or must I break everything down in to more basic variables such as chars, ints and floats? I will be monitoring this question throughout the day to provide clarifications in the aid of an answer.Sep 03,  · The program later goes on to a switch statement allowing the user to read or write depending on a choice.

The problem I am having is that when creating the fbin object it's as though I need the file to be already created since im using the flag ios::in. An array is a way of storing values by having the address of the first element and accessing other elements by index.

An array is basically a pointer to the first element. The next attempt of mine works on the basis that attempting to use ios::app with ios::binary simply won't work, and that to ammend a file I must read the entire thing in, make my alterations, then write back and replace the entire contents of the file, although this does seem somewhat inefficient.

CMake is a cross-platform, open-source build system. CMake is part of a family of tools designed to build, test and package software.


CMake is used to control the software compilation process using simple platform and compiler independent configuration files. CMake generates native makefiles and workspaces that can be used in the compiler environment of your choice. Would be cool to be able to write more than one char with the fstream and override the operator.

– seggaeman Nov 27 '11 at add a comment | Your Answer. torosgazete.com(StringLength); torosgazete.com((char *)&Name[0], StringLength); Your original line overwrites the string object data from the beginning, which may contain the string length and capacity, for instance, instead of the character data.

C++ iostream binary read and write issues - Stack Overflow