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POstring size is different on Windows than on Linux
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  1. POstring size is different on Windows than on Linux
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    copied!<p>I stumbled upon strange behavior of <strong>string::substr</strong>. Normally I code on <strong>Windows 7</strong> in Eclipse+MinGW, but when I was working on my laptop, using Eclipse in <strong>Linux</strong> (Ubuntu 12.04) I noticed difference in result.</p> <p>I was working with <strong>vector&lt; string ></strong> filled with lines of text. One of steps was to remove last character from line.</p> <p>In win7 Eclipse I did:</p> <pre><code>for( int i = 0; i &lt; (int)vectorOfLines.size(); i++ ) { vectorOfTrimmedLines.push_back( ((string)vectorOfLines.at(i)).substr(0, ((string)vectorOfLines.at(i)).size()-1) ); } </code></pre> <p>and it works like intended (removing last character from each line)</p> <p>But in Linux this code do not trim. Instead I needed to do it like this:</p> <pre><code>// -2 instead -1 character vectorOfTrimmedLines.push_back( ((string)vectorOfLines.at(i)).substr(0, ((string)vectorOfLines.at(i)).size()-2) ); </code></pre> <p>or using another method:</p> <pre><code>vectorOfTrimmedLines.push_back( ((string)vectorOfLines.at(i)).replace( (((string)vectorOfLines.at(i)).size()-2),1,"",0 )); </code></pre> <p>Ofcourse Linux methods work wrong way on windows (trimming 2 last characters, or replacing one before last).</p> <p>The problem seems to be that myString.size() return number of characters in Windows, but in Linux it returns number of characters + 1. Could it be that new line character is counted on Linux?</p> <p>As a newbie in C++ and programming general, I wonder why it is like that, and how can this be done to be platform independent.</p> <p>Another thing that I wonder is : which method is preferable (faster) <strong>substr</strong> or <strong>replace</strong>?</p> <p>Edit: Method used to fill string s this function i wrote:</p> <pre><code>vector&lt; string &gt; ReadFile( string pathToFile ) { // opening file ifstream myFile; myFile.open( pathToFile.c_str() ); // vector of strings that is returned by this function, contains file line by line vector&lt; string &gt; vectorOfLines; // check if the file is open and then read file line by line to string element of vector if( myFile.is_open() ) { string line; // this will contain the data read from current the file while( getline( myFile, line ) ) // until last line in file { vectorOfLines.push_back( line ); // add current line to new string element in vector } myFile.close(); // close the file } // if file does not exist else { cerr &lt;&lt; "Unable to open file." &lt;&lt; endl; // if the file is not open output //throw; } return vectorOfLines; // return vector of lines from file } </code></pre>
 

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