FStream: Managing Flash Streams in the File System.
Q: How do I write a structure to a file? A: You can easily write a structure to a file as long as the structure is what is known as a POD (Plain Old Data) type. This means that all members of the structure must be of a fixed size, which implies that the structure can not contain pointers. This stipulation goes for all members of the structure.
It is used to create a file and insert content into the file. In simpler words, this class is used to write data to a file. 3. fstream This is a generic base class and can be used for both reading and writing data to the file. Writing Data to a File To understand how can we write data to a file, consider Example1. Example1.
The diskette may be write-protected so that open cannot create such a file. It is therefore important to follow a call to open with a test to see if the call was successful. Take appropriate actions if the call was not successful. This test can be performed using the member function fail for each of the classes ifstream and ofstream.
The trouble with writing binary blobs is that they lead to brittle storage. The stored objects have a tendency to break over time as the assumptions you make about the hardware no longer hold true (in this case that the sizeof(int) is constant and the endianess of int will not change). It has become more standard therefore to use a method know as serialization.