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    <p>You might not want to use <a href="http://www.cplusplus.com/reference/iostream/manipulators/endl/" rel="nofollow">std::endl</a>, because it flushes the output stream.</p> <p>Additionaly, if you want compatibility to Windows (and probably any other OS from Microsoft), you have to open the file in binary mode. Microsoft opens files in text mode by default, which usually has an incompatibility-feature (ancient-DOS-backward-compatibility) no one wants anymore: It replaces every "\n" with "\r\n".</p> <p>The PGM file format header is:</p> <pre><code>"P5" + at least one whitespace (\n, \r, \t, space) width (ascii decimal) + at least one whitespace (\n, \r, \t, space) height (ascii decimal) + at least one whitespace (\n, \r, \t, space) max gray value (ascii decimal) + EXACTLY ONE whitespace (\n, \r, \t, space) </code></pre> <p>This is an example to output a pgm to file:</p> <pre><code>#include &lt;fstream&gt; const unsigned char* bitmap[MAXHEIGHT] = …;// pointers to each pixel row { std::ofstream f("test.pgm",std::ios_base::out |std::ios_base::binary |std::ios_base::trunc ); int maxColorValue = 255; f &lt;&lt; "P5\n" &lt;&lt; width &lt;&lt; " " &lt;&lt; height &lt;&lt; "\n" &lt;&lt; maxColorValue &lt;&lt; "\n"; // std::endl == "\n" + std::flush // we do not want std::flush here. for(int i=0;i&lt;height;++i) f.write( reinterpret_cast&lt;const char*&gt;(bitmap[i]), width ); if(wannaFlush) f &lt;&lt; std::flush; } // block scope closes file, which flushes anyway. </code></pre>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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