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Incorrect output file: c++ (i/o) question

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Incorrect output file: c++ (i/o) question

 
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  #1
Nov 24th, 2008
I encode a text file using a huffman tree. Which print out to the screen and and output to a file. File only contains the last line that prints to the console.

C++ Syntax (Toggle Plain Text) 
  1. void traverse(string code = "") const {
  2. 		string outputFile = "huffman.txt";
  3. 		ofstream outfile(outputFile.c_str());
  4.  
  5.  
  6. 		if (child0 !=NULL) {
  7.  
  8. 			static_cast<huffman_item<dtype> >( *child0).traverse(code + '0' );		
  9.  
  10. 			static_cast<huffman_item<dtype> >( *child1).traverse(code + '1' );
  11.  
  12. 		} else{
  13.  
  14. 			outfile << data << freq << code << endl;
  15. 			cout << " Data: " << data << " Frequency: " << freq << " Code: " << code << endl;
  16.  
  17. 		}
  18.  
  19. 	}

This is method. Can someone please help me!
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Re: Incorrect output file: c++ (i/o) question

 
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  #2
Nov 24th, 2008
Is recursion really necessary for this? Whenever possible avoid using it. It's inefficient, hard to implement, and hard to debug. It seems as though the function recursively calls itself until it is at the end of the list, then it displays a line. In each recursive call, you should be outputting a line, otherwise it will traverse to the end and display the last line. If recursion isn't necessary, use a loop instead.
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Re: Incorrect output file: c++ (i/o) question

 
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  #3
Nov 24th, 2008
figure out the problem! this is a recursive function...
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Re: Incorrect output file: c++ (i/o) question

 
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  #4
Nov 24th, 2008
yeah it creates a output file each time the function is called. the way i have it setup i need a recursive function.
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Re: Incorrect output file: c++ (i/o) question

 
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  #5
Nov 24th, 2008
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Originally Posted by drjay1627 View Post
figure out the problem! this is a recursive function...
Ummm...ok? I'm pretty sure I told you the solution. Being polite will get you farther in life.
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Re: Incorrect output file: c++ (i/o) question

 
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  #6
Nov 24th, 2008
I replied the before I read you solution. Didn't expect a quick response. Sorry mate!

I still have the same problem though! Need to figure out a way to edit an existing file rather than create a new file. Or maybe I should create a file before the function is called...
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Re: Incorrect output file: c++ (i/o) question

 
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  #7
Nov 24th, 2008
Open the file in append mode.

C++ Syntax (Toggle Plain Text) 
  1. ostream fOut;
  2. fOut.open("file.dat", ios::append);

I'm pretty sure that's how it's done.
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