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POseekg and tellg miscompatibility
 

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  1. POseekg and tellg miscompatibility
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    <p>I am writing a C++ console application. After creating an Matrix with size(int) rowSize and columnSize, I wanted to write the letters in text file to matrix, but while loop never runs because reader's location is -1, and I couldn't take it to 0. Any ideas?</p> <pre><code>void writeText2Vec(ifstream &amp; reader, tmatrix&lt;char&gt; &amp; table){ string s; int length, row = 0, column = 0; //beginning: column and //row ids are set to 0. reader.seekg(0); //reset the pointer to start cout &lt;&lt; reader.tellg(); // it results in -1. while (getline(reader,s)){ //for each line while loop occurs. length = s.length(); for(column = 0; column &lt; length; column++) { table[row][column] = s.at(column); //writing the letter to matrix. } row++; } bool openFile(ifstream &amp; reader, string filename){ reader.open(filename.c_str()); if (reader.fail()){ exit("File cannot be found."); return false; } else { return true; } } bool check(ifstream &amp; reader, int &amp; rowSize, int &amp; columnSize){ //checks for valid characters, if they are //alphabetical or not and for the length. string s; int len = 0, max = 0; while (getline(reader,s)){ //runs for every line. rowSize++; //calculation of row size while (len &lt; s.length()){ if (!(isalpha(s.at(len)))){ // Check to see if all characters are alphabetic. exit("Matrix contains invalid characters!"); return false; } len++; } if (max == 0){ //if max is not set. max = len; len = 0; } else if (!(max == len)){ //if they are different, then appropriate //error message is returned. exit("Matrix is not in a correct format!"); return false; } else { //else it resets. len = 0; } } rowSize -= 1; columnSize = s.length(); //the last length is equal to column size return true; } </code></pre>
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. CO`-1` return value from `tellg()` indicates a failure, not a position. Can you post the calling code of `writeText2Vec()`?
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      1. UShmjd
    2. COTry `reader.seekg(0, std::ios::beg)` instead.
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      1. USKerrek SB
    3. COtried ios::beg but didn't change the result. tmatrix<char> table(rowSize, columnSize); //creation of the matrix table. writeText2Vec(reader, table); //write the txt file to matrix.
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      1. POseekg and tellg miscompatibility
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