Solved

Readfile Question...

Posted on 2004-04-12
5
358 Views
Last Modified: 2010-04-01
I am trying to read a file into a string and crypt it, I don't want to use getline (since some of file does not have any specific character such as '\n'), read by char and crypt it is too slow, so I would like read amount of characters into a string, and then just crypt it.
I select 3000 character each time I read from file, my code like below...
CAN SOMEONE TEACH ME MORE EFFICIENT WAY TO DO THIS JOB???

THANK YOU SO MUCH....

//======================================================
// The code is work, but I would like to know if any efficient way to do this job... Thanks
//======================================================
const int AMOUNT = 3000;
......
ifstream ifile;
string filename = "c:\\test.txt";
ifile.open(filename.c_str());
if(!ifile.is_open())
    return;

string str = "";
char c;
while(!ifile.eof())
{
   str = "";
   for(int i = 0; i < AMOUNT && !ifile.eof(); i++)
   {
       ifile >> c;
       str += c;
   }
   doCrypt(str);
}
0
Comment
Question by:billcch
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
5 Comments
 
LVL 44

Accepted Solution

by:
Karl Heinz Kremer earned 500 total points
ID: 10806439
Use ifstream::read(char *buffer, int size), so in your case this would be

char buffer[AMOUNT];
ifile.read(buffer, AMOUNT);

BTW: This is usually done with a "Points for ..." question, not a completely new question. See the EE Help for more information (http://www.experts-exchange.com/Programming/Programming_Languages/Cplusplus/help.jsp#hi50).
0
 

Author Comment

by:billcch
ID: 10806463
Thank you khkremer....
0
 
LVL 44

Expert Comment

by:Karl Heinz Kremer
ID: 10806556
On second thought, you should probably delete this question (have it deleted by the Support team) and reopen the first question (support can also do this for you).
0
 

Author Comment

by:billcch
ID: 10806595
hi, khkremer:
is this your email address?
eexchange@khk.net
Thanks!
billcch
0
 

Author Comment

by:billcch
ID: 10807782
Again, Thank you very much khkremer....
Billcch
0

Featured Post

Enroll in June's Course of the Month

June's Course of the Month is now available! Every 10 seconds, a consumer gets hit with ransomware. Refresh your knowledge of ransomware best practices by enrolling in this month's complimentary course for Premium Members, Team Accounts, and Qualified Experts.

Question has a verified solution.

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

Introduction This article is the first in a series of articles about the C/C++ Visual Studio Express debugger.  It provides a quick start guide in using the debugger. Part 2 focuses on additional topics in breakpoints.  Lastly, Part 3 focuses on th…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
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 be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

724 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