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Sep 5th, 2007

Read a binary file

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Can someone explain, how can read a binary file. I'm really nervous with this.

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eranga262154

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Sep 5th, 2007

Re: Read a binary file

Google it and you'll get loads of good articles on that:
http://www.google.com/search?ie=UTF-...les+in+c%2B%2B

vishesh

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Sep 5th, 2007

Re: Read a binary file

I wrote one as follows.

(Toggle Plain Text)

string line;
	ifstream fileread ("path to the binary file");

	while(! fileread.eof())
	{
		getline(fileread, line);
		cout << line << endl;
	}

	fileread.close();

Well I read a binary file using this, the command prompt is really mad. It,s not displays as a binary code, I mean bunch of zeros and ones.

Can you say where I'm going wrong.

Last edited by eranga262154; Sep 5th, 2007 at 3:40 am. Reason: Incorrect

eranga262154

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Sep 5th, 2007

Re: Read a binary file

Of course it won't. You could see all scraps. Binary files are not the one which are written as 01010101011110. It means that the data is encoded as binary.

vishesh

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Sep 5th, 2007

Re: Read a binary file

So, what should I do? Can you explain a little more.

eranga262154

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Sep 5th, 2007

Re: Read a binary file

Click to Expand / Collapse Quote originally posted by eranga262154 ...

So, what should I do? Can you explain a little more.

What do you want to do? Read More.

Last edited by vishesh; Sep 5th, 2007 at 4:14 am.

vishesh

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Sep 5th, 2007

Re: Read a binary file

Another article from google
http://www.angelfire.com/country/ald...aryFileIO.html

galin

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Sep 5th, 2007

Re: Read a binary file

Thanks for all the links.

eranga262154

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Sep 5th, 2007

Re: Read a binary file

Click to Expand / Collapse Quote originally posted by eranga262154 ...

I wrote one as follows.
(Toggle Plain Text)
string line;
	ifstream fileread ("path to the binary file");

	while(! fileread.eof())
	{
		getline(fileread, line);
		cout << line << endl;
	}

	fileread.close();
string line; ifstream fileread ("path to the binary file"); while(! fileread.eof()) { getline(fileread, line); cout << line << endl; } fileread.close();
Well I read a binary file using this, the command prompt is really mad. It,s not displays as a binary code, I mean bunch of zeros and ones.

Can you say where I'm going wrong.

Two problems:
1: Binary data is not string data. You should probably be using a char array.
2: while(! fileread.eof()) will not work properly. See this (feof() is the same as .eof())

WaltP

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Sep 5th, 2007

Re: Read a binary file

Quote ...

1: Binary data is not string data. You should probably be using a char array.

How does that make a difference? A string just handles the memory for the char array instead of making you do it. I don't think there should be any problem with using a string as long as you don't do any text conversions.

C++ Syntax (Toggle Plain Text)
ifstream fileread ("path to the binary file");
string contents;
char ch;
 
// Get the binary data
while ( fileread.get( ch ) ) {
  contents.push_back( ch );
}
 
// Print the binary data as hex
for ( int i = 0; i < contents.size(); ++i ) {
  cout<< hex << int( contents[i] ) <<" ";
}
 
fileread.close();
ifstream fileread ("path to the binary file");
string contents;
char ch;

// Get the binary data
while ( fileread.get( ch ) ) {
  contents.push_back( ch );
}

// Print the binary data as hex
for ( int i = 0; i < contents.size(); ++i ) {
  cout<< hex << int( contents[i] ) <<" ";
}

fileread.close();

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