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POC++ OverLoading the << again
 

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    <p>So my code is compiling ok - however it is not doing what i hoped :(. </p> <p>Ill try and explain this as best I can -</p> <p>Below is my code that is writing to a file on disk.</p> <pre><code>void NewSelectionDlg::PrintInfoFile() { **CProductListBox b;** ofstream outdata; outdata.open("test.dat", ios::app); // opens the file &amp; writes if not there. ios:app - appends to file if( !outdata ) { // file couldn't be opened cerr &lt;&lt; "Error: file could not be opened" &lt;&lt; endl; exit(1); } outdata &lt;&lt; m_strCompany &lt;&lt; endl; outdata &lt;&lt; m_strAppState &lt;&lt; endl; outdata &lt;&lt; m_strPurpose &lt;&lt; endl; outdata &lt;&lt; m_strChannel &lt;&lt; endl; outdata &lt;&lt; m_strProductName &lt;&lt; endl; **outdata &lt;&lt; b &lt;&lt; endl;** outdata &lt;&lt; endl; outdata.close(); return; } </code></pre> <p>The key lines im concerned about are in Bold. I want to print out a class CProductListBox. Now as this is not a string, etc I know I have to over-ride the &lt;&lt; in order to be able to do this. So my class for CProductListBox looks like this:</p> <pre><code>class CProductListBox : public CListBox { DECLARE_DYNAMIC(CProductListBox) public: CProductListBox(); virtual ~CProductListBox(); **friend std::ostream&amp; operator&lt;&lt; (std::ostream&amp; o, const CProductListBox&amp; b) { return o; }** </code></pre> <p>I have bolded again what i think is important - It is printing nothing on the output file unfortunately were I was hoping it would print the contenets of what is in b (the CProductList class).</p> <p>Can anyone see something stupid I may be missing - Many Thanks,</p> <p>Colly (Ireland)</p>
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    1. USuser617702
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    1. COYour `operator<<` doesn't do anything; if you want to write data to the stream, you need to write the code to write the data to the stream...
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      1. USJames McNellis
 

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