File Modes in VS .NET

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Table 83 File Modes
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in out app ate trunc binary
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open for input open output seek to the end before every write seek to the end immediately after the open truncate an existing stream when opening it do IO operations in binary mode
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The modes out, trunc, and app may be specifed only for files associated with an ofstream or anfstream;in may be specified only for files associated with either ifstream or fstream Any file may be opened in ate or binary mode The ate mode has an effect only at the open:
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Opening a file in ate mode puts the file at the end-of-file immediately after the open A stream opened in binary mode processes the file as a sequence of bytes; it does no interpretation of the characters in the stream
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C++ Primer, Fourth Edition By Stanley B with an ifstream By default, files associatedLippman,Jos e Lajoie, are opened in in mode, which is the mode that Barbara E Moo permits the file to be read Files opened by an ofstream are opened in out mode, which permits the file to be written A file opened in out mode is truncated: All data stored in the file Publisher:Addison Wesley is discarded Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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Table of Contents | Index
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In effect, specifying out mode for an ofstream is equivalent to specifying both out and trunc
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the means to write useful programs without first having to master every language detail Highlighting today's best practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for quicker the existing data in a file opened by an ofstream is to programming The only way to preservelearning, using the C++ standard library Updated to teach the most currentspecify app styles explicitly: modeand program design techniques Filled with new learning aids that emphasize important points, warn about common pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the addressmode by default; truncates file named "file1" // output below
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ofstream outfile("file1"); // equivalent effect: "file1" is explicitly truncated ofstream outfile2("file1", ofstream::out | ofstream::trunc); // append mode; adds new data at end of existing file named "file2" ofstream appfile("file2", ofstream::app);
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The definition of outfile2 uses the bitwise OR operator (Section 53, p 154) to open inOut in bothout and trunc mode
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Using the Same File for Input and Output
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Anfstream object can both read and write its associated file How an fstream uses its file depends on the mode specified when we open the file By default, an fstream is opened with both in and out set A file opened with both in and out mode set is not truncated If we open the file associated with an fstream with out mode, but notin mode specified, then the file is truncated The file is also truncated if trunc is specified, regardless of whether in is specified The following definition opens the file copyOut in both input and output mode:
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// open for input and output fstream inOut("copyOut", fstream::in | fstream::out);
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