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What's the difference between ios::ate and ios:app when writing to a file.
In my view, ios::app gives you the ability to move around in the file, whereas with ios::ate it can only read/write at the end of the file. Is this correct?
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ios::ate. Opens an existing file (either input or output) and seeks to the end.
Apple provides Objective-C++ as a convenient mechanism for mixing Objective-C code with C++ code. Objective-C is close to C but with object-oriented features implemented as a thin layer on top of C. It's a strict superset of C which makes any C code a valid Objective-C program.
ios::app (short for append) means that instead of overwriting the file from the beginning, all output operations are done at the end of the file. This is only meaningful if the file is also open for output. ios::trunc (short for truncate) means that when the file is opened, the old contents are immediately removed.
ios::binary makes sure the data is read or written without translating new line characters to and from \r\n on the fly. In other words, exactly what you give the stream is exactly what's written.
It’s the other way around. When ios::ate is set, the initial position will be the end of the file, but you are free to seek thereafter. When ios::app is set, all output operations are performed at the end of the file. Since all writes are implicitly preceded by seeks, there is no way to write elsewhere.
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