Solved

Read file data into a class

Posted on 2002-07-02
3
180 Views
Last Modified: 2010-04-01
How can I read the data from a file straight into a MFC class using visual c++ 6.0?  I know that you can do it using a structure but is there a way to do it using a class?

  I tried using infile.read((char*) classname, classname.GetLength());
0
Comment
Question by:adatd
  • 2
3 Comments
 
LVL 49

Expert Comment

by:DanRollins
ID: 7125571
MFC supports a concept called "object serialization"  All objects that are derived from CObject have this capability.  You just override the Serialize member function and then send the data to disk or read it from disk.

Here is a starting point for you:
http://search.microsoft.com/gomsuri.asp?n=1&c=rp_Results&siteid=us/dev&target=http://msdn.microsoft.com/library/en-us/vccore98/HTML/_core_serialization_.28.object_persistence.29.asp

and here is an example that shows how easy it is:
http://msdn.microsoft.com/library/en-us/vcmfc98/html/_mfc_cobject.3a3a.serialize.asp

-=-==-=--==-
It is also possible to just dump a blob of data into the area where the object keeps its data members (much as it sounds like you might be doing with a struct).  But it is never recommended because of the danger of overwriting important areas of memory.

-- Dan
0
 
LVL 30

Accepted Solution

by:
Axter earned 50 total points
ID: 7125751
If your class is a POD object, then you can use the following method:
infile.read((char*)classname, sizeof(classname));
0
 
LVL 30

Expert Comment

by:Axter
ID: 7125754
If classname is a CString, you can use CStdioFile::ReadString to read it into the CString.

Example:
CStdioFile MyFile("data.txt");
CString MyCStr;
MyFile.ReadString(MyCStr);
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Templates For Beginners Or How To Encourage The Compiler To Work For You Introduction This tutorial is targeted at the reader who is, perhaps, familiar with the basics of C++ but would prefer a little slower introduction to the more ad…
Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.

786 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question