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2013-12-31T20:17:27.137
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2014-01-01T17:46:06.700
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You truncate a file by calling <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa365541.aspx" rel="nofollow"><code>SetFilePointer</code></a> or <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa365542.aspx" rel="nofollow"><code>SetFilePointerEx</code></a> to the desired location followed by <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa365531.aspx" rel="nofollow"><code>SetEndOfFile</code></a>. The following shows how a <code>truncate</code> function can be implemented: <pre><code>bool truncate( HANDLE hFile, LARGE_INTEGER NewSize ) { LARGE_INTEGER Size = { 0 }; if ( GetFileSizeEx( hFile, &Size ) ) { LARGE_INTEGER Distance = { 0 }; // Negative values move the pointer backward in the file Distance.QuadPart = NewSize.QuadPart - Size.QuadPart; return ( SetFilePointerEx( hFile, Distance, NULL, FILE_END ) && SetEndOfFile( hFile ) ); } return false; } // Helper function taking a file name instead of a HANDLE bool truncate( const std::wstring& PathName, LARGE_INTEGER NewSize ) { HANDLE hFile = CreateFileW( PathName.c_str(), GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL ); if ( hFile == INVALID_HANDLE_VALUE ) { return false; } bool Success = truncate( hFile, NewSize ); CloseHandle( hFile ); return Success; } </code></pre> <hr> EDIT: Shorter Version The <code>truncate</code> function can be shortened to the following: <pre><code>bool truncate( HANDLE hFile, LARGE_INTEGER NewSize ) { return ( SetFilePointerEx( hFile, NewSize, NULL, FILE_BEGIN ) && SetEndOfFile( hFile ) ); } </code></pre> If you would rather want to pass the amount of bytes by which to shrink the file, the following implementation can be used: <pre><code>bool truncate( HANDLE hFile, LARGE_INTEGER ShrinkBy ) { ShrinkBy.QuadPart = -ShrinkBy.QuadPart; return ( SetFilePointerEx( hFile, ShrinkBy, NULL, FILE_END ) && SetEndOfFile( hFile ) ); } </code></pre> <hr> To grow a file, open the file using <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa363858.aspx" rel="nofollow"><code>CreateFile</code></a> with a <code>dwDesiredAccess</code> that contains <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa364399.aspx" rel="nofollow"><code>FILE_APPEND_DATA</code></a>. Using <code>SetFilePointer</code> again to set the file pointer to the end of file you can then write new data calling <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa365747.aspx" rel="nofollow"><code>WriteFile</code></a>. For an example, see <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa363778.aspx" rel="nofollow">Appending One File to Another File</a>. <hr> EDIT: Growing a file without writing to it If you don't care about the file contents beyond the original file size you can apply the same sequence as shown for truncating a file to extend it: <pre><code>bool SetFileSize( HANDLE hFile, LARGE_INTEGER NewSize ) { return ( SetFilePointerEx( hFile, NewSize, NULL, FILE_BEGIN ) && SetEndOfFile( hFile ) ); } </code></pre> This is documented behavior for <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa365531.aspx" rel="nofollow"><code>SetEndOfFile</code></a>: <blockquote> The SetEndOfFile function can be used to truncate or extend a file. If the file is extended, the contents of the file between the old end of the file and the new end of the file are not defined. </blockquote>
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1. POAdd/Remove bytes from end of file on Windows
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1. POAdd/Remove bytes from end of file on Windows
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1. COI like this answer, but I'd like to get it to work before I officially accept it. It might be some time though; I'm still researching exactly how to do it. I don't use windows functions often.
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