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To perform input and output, a C++ program: Formatted IO operations are supported via overloading the stream insertion ( >) operators, which presents a consistent public IO interface. In unformatted or low-level IO, bytes are treated as raw bytes and unconverted. In formatted or high-level IO, bytes are grouped and converted to types such as int, double, string or user-defined types.
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ISTREAM IT ALL ARCHIVE
Streams acts as an intermediaries between the programs and the actual IO devices, in such the way that frees the programmers from handling the actual devices, so as to archive device independent IO operations.Ĭ++ provides both the formatted and unformatted IO functions. In output operations, data bytes flow from the program to an output sink (such as console, file, network or another program).
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In input operations, data bytes flow from an input source (such as keyboard, file, network or another program) into the program. The same set of operations can be applied to different types of IO devices.Ĭ/C++ IO are based on streams, which are sequence of bytes flowing in and out of the programs (just like water and oil flowing through a pipe).
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In other words, there is no keyword like read or write. Writes a specified number of bytes into the stream object starting at the current seek pointer.The C language did not build the input/output facilities into the language. Removes the access restriction on a range of bytes previously restricted with the LockRegion(Int64, Int64, Int32) method. Retrieves the STATSTG structure for this stream. Reads a specified number of bytes from the stream object into memory starting at the current seek pointer.ĭiscards all changes that have been made to a transacted stream since the last Commit(Int32) call.Ĭhanges the seek pointer to a new location relative to the beginning of the stream, to the end of the stream, or to the current seek pointer. Restricts access to a specified range of bytes in the stream. For more information, see How to: Map HRESULTs and Exceptions.Ĭreates a new stream object with its own seek pointer that references the same bytes as the original stream.Įnsures that any changes made to a stream object that is open in transacted mode are reflected in the parent storage.Ĭopies a specified number of bytes from the current seek pointer in the stream to the current seek pointer in another stream.
ISTREAM IT ALL CODE
The common language runtime throws an exception when a COM method in native code returns an HRESULT other than S_OK. InterfaceTypeAttribute GuidAttribute Remarksįor more information, see the documentation for the IStream and ISequentialStream interfaces.