Re: My own fuction: Access Violation error...

"Giovanni Dicanio" <>
Wed, 12 Mar 2008 11:08:28 +0100
"Blue Streak" <> ha scritto nel messaggio

Cannot be helped, old application uses char* all over the place and
I'm not re-writing the *whole* program.

OK, you do want to use char*.

However, I would really suggest to use a robust string class, and avoid
strtok (which has several problems, like exposing code to buffer overruns
attacks, etc.).

You may consider this code for splitting a string into substrings (and I
used std::string, so it is compatible with your need of char *):


typedef std::vector< std::string > StringList;

// Split a string into substrings using delimiters.
void Split(
    StringList & substrings, // [out]
    const std::string & s, // [in]
    const std::string & delimiters )// [in]
    // Clear output parameter

    // Each token in input string is delimited by two "pointers":
    // 'begin' and 'end'.
    // These "pointers" (indexes in string) are updated during
    // string splitting, they are moved scanning input string.

    // Skip delimiters at beginning (if any)
    string::size_type begin = s.find_first_not_of( delimiters, 0 );

    // Find first non-delimiter
    string::size_type end = s.find_first_of( delimiters, begin );

    // Splitting loop
    while (end != string::npos || begin != string::npos)
        // Found a token: add it to the substring vector
        substrings.push_back( s.substr( begin, end - begin ) );

        // Skip delimiters
        begin = s.find_first_not_of( delimiters, end );

        // Find next non-delimiter
        end = s.find_first_of( delimiters, begin );


You can use the Split function like this:


void TestSplit()
    std::string input = "Jim Joe Jeff John";
    StringList names;
    Split( names, input, " ");

    // Print substrings
    int count = (int)names.size();
    for ( int i = 0; i < count; i++ )
        std::cout << names[i].c_str() << std::endl;



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