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POCan this be done without reading file twice? C++
 

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  1. POCan this be done without reading file twice? C++
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    <p>What im doing here in main.cpp is reading a text file twice: once to remove the '\' from each path name, and again to supply the original name of the file to the SetPath() in my implementation File.</p> <pre><code>// This a read file sub-routine called in the main function. // Its purpose was intentionally set out to read the file, and pass information // to functions to MyClassFile Implementational file. // global varaible to have the file spec. char MyClass::List_[ ARRY_SZ ] = {}; int main() { .. inFile.open( MyClass::List_, ios::in ); while ( inFile.peek() != '\n' ) { inFile.get( ch ); if ( ch == 92 ) count++; } inFile.clear(); inFile.close(); inFile2.open( MyClass::List_, ios::in ); while ( inFile2.peek() != EOF ) { for( unsigned short i = 0 ; i &lt; count; i++ ) { inFile2.getline( tmpArray, ENTRY_SZ, 92 ); } inFile2.getline( tmpArray, ENTRY_SZ, '\n' ); MyObject = new MyClass( tmpArray ); // Name W/O Path LinkedObject-&gt;AddLink( MyObject ); lineCount++; } while ( inFile2.peek() != EOF ) { inFile2.getline( tmpArray, ENTRY_SZ, '\n' ); MyObject-&gt;GetPath( tmpArray ); } inFile2.clear(); inFile2.close(); } </code></pre> <p>The text file is of this format:</p> <pre><code>C:/temp/fileID C:/temp/FileID2 </code></pre> <p>I need to pass just the name to a copy constructor. I need to pass the full path name which is still in the text file to a MyClass::GetPath() function in my Implementation file.</p> <p>Is there a way to do this without reading the file twice? I hope you can see what im trying to do here. i can probably just rewind to the beginning or something like that</p>
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    1. USMSalters
    1. USuser40120
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      1. POCan this be done without reading file twice? C++
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      1. POCan this be done without reading file twice? C++
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    1. COYes, you can rewind a file pointer to the beginning; see seek(). A single-pass algorithm would be better, though. That said -- I find this question hard to parse, and the subject very nondescriptive; using the word "this" is not useful when someone is trying to determine whether a question is worth their time based on a one-line summary.
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      1. POCan this be done without reading file twice? C++
      1. USCharles Duffy
    2. COUsing (ch == 92) is a bad sign. Use: (ch == '\\')
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      1. POCan this be done without reading file twice? C++
      1. USJonathan Leffler
 

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