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NCBI C++ ToolKit: SEmbeddedStreamReaderWriter Struct Reference

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Definition at line 41 of file netstorage.cpp.

Via parameter "count" (which is guaranteed to be supplied non-NULL) return the number of bytes that are ready to be read from the input device without blocking.

Return eRW_Success if the number of pending bytes has been stored at the location pointed to by "count". Return eRW_NotImplemented if the number cannot be determined. Otherwise, return other eRW_... condition to reflect the problem ("*count" does not need to be updated in the case of non-eRW_Success). Note that if reporting 0 bytes ready, the method may return either both eRW_Success and zero "*count", or return eRW_NotImplemented alone.

Implements IReader.

Definition at line 46 of file netstorage.cpp.

References m_Impl, and IReader::PendingCount().

Read as many as "count" bytes into a buffer pointed to by the "buf" argument.

Always store the number of bytes actually read (0 if read none) via the pointer "bytes_read", if provided non-NULL. Return non-eRW_Success code if EOF / error condition has been encountered during the operation (some data may have been read, nevertheless, and reflected in "*bytes_read"). Special case: if "count" is passed as 0, then the value of "buf" must be ignored, and no change should be made to the state of the input device (but may return non-eRW_Success to indicate that the input device has already been in an error condition).

Note

Apparently, may not return eRW_Success if hasn't been able to read "count" bytes as requested, and "bytes_read" was provided as NULL.

When returning "*bytes_read" as zero for a non-zero "count" requested, the return status should not indicate eRW_Success.

Warning

"*bytes_read" may never be returned greater than "count".

Attention

It is implementation-dependent whether the call blocks until the entire buffer is read or the call returns when at least some data are available. In general, it is advised that this call is made within a loop that checks for EOF condition and proceeds with the reading until the required amount of data has been retrieved.

Implements IReader.

Definition at line 45 of file netstorage.cpp.

References b, m_Impl, r(), and IReader::Read().

Write up to "count" bytes from the buffer pointed to by the "buf" argument onto the output device.

Always store the number of bytes actually written, or 0 if "count" has been passed as 0 ("buf" must be ignored in this case), via the "bytes_written" pointer, if provided non-NULL. Note that the method can return non-eRW_Success in case of an I/O error along with indicating (some) data delivered to the output device (and reflected in "*bytes_written").

Note

Apparently, may not return eRW_Success if hasn't been able to write "count" bytes as requested, and "bytes_written" was passed as NULL.

When returning "*bytes_written" as zero for a non-zero "count" requested, the return status should not indicate eRW_Success.

Warning

"*bytes_written" may never be returned greater than "count".

Attention

It is implementation-dependent whether the call blocks until the entire buffer or only some data has been written out. In general, it is advised that this call is made within a loop that checks for errors and proceeds with the writing until the required amount of data has been sent.

Implements IWriter.

Reimplemented in SIoStreamEmbeddedStreamReaderWriter.

Definition at line 47 of file netstorage.cpp.

References b, m_Impl, and IWriter::Write().

Referenced by SIoStreamEmbeddedStreamReaderWriter::Write().

The documentation for this struct was generated from the following file:

• src/connect/services/netstorage.cpp

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