Ad:

C++ Discussion Thread
Marked Solved
Views: 4346

Oct 21st, 2009

C++ String Parsing?

Expand Post »

Hi, I was hoping someone could help me with a C++ string problem. I currently have my program open up a file, read the contents into a string, and then I am trying to look for certain key characters in the string, like < and </. In short, I am trying to read an XML type file.

Here is my code so far:

C++ Syntax (Toggle Plain Text)
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
 
int main()
{
     string document;
     string temp;
     ifstream infile;
 
     infile.open("file.txt");
 
 
     while (! infile.eof())
    {
          infile >> temp; // Put contents of infile (file.txt) into temp. Temp is here b/c it will be used later at some point....
          document += temp; // Put contents of temp into document.
     }
 
     cout << document << endl; // read document to varify string is correct
     for(int i=0; i<document.length(); i++) {
              if (document[i] = '<') { cout << endl << "'<' encountered" << endl; //Go to a function that takes care of the rest of the file. I will pass the string and 'i' to it. 
              }; 
              }
     infile.close();
system("pause");
return 0;
}
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
     string document;
     string temp;
     ifstream infile;

     infile.open("file.txt");


     while (! infile.eof())
    {
          infile >> temp; // Put contents of infile (file.txt) into temp. Temp is here b/c it will be used later at some point....
          document += temp; // Put contents of temp into document.
     }
     
     cout << document << endl; // read document to varify string is correct
     for(int i=0; i<document.length(); i++) {
              if (document[i] = '<') { cout << endl << "'<' encountered" << endl; //Go to a function that takes care of the rest of the file. I will pass the string and 'i' to it. 
              }; 
              }
     infile.close();
system("pause");
return 0;
}

I currently have a text document (file.txt) that looks like this:

C++ Syntax (Toggle Plain Text)

<name first>joe</name>
<name first>ann</name>
<name>bob builder</name>

and the program spits out this:

C++ Syntax (Toggle Plain Text)
<namefirst>joe</name><namefirst>ann</name><name>bobbuilder</name>
 
'<' encountered
'<' encountered
'<' encountered
some more of them in here.... as many of them as there are characters in the file. 
'<' encountered
'<' encountered
'<' encountered
Press any key to continue . . .
<namefirst>joe</name><namefirst>ann</name><name>bobbuilder</name>

'<' encountered
'<' encountered
'<' encountered
some more of them in here.... as many of them as there are characters in the file. 
'<' encountered
'<' encountered
'<' encountered
Press any key to continue . . .

The program also strips out white spaces. I guess there not really necessary, but if anyone knows how to preserve them that would be nice.

By the way, when I make if (document[i] = '<') into if (document[i] = "<") , i get a invalid conversion from `const char*' to `char' error.

Similar Threads

Parsing a string: By lines. in C
String Parsing using known delimiters? [C++] in C++
String parsing in C++
repost: leak using c++ string in C++
leak using c++ string in C++

dylank

Reputation Points: 10

Solved Threads: 3

Junior Poster in Training