d65fd4e93f
Overrride in file streams to test foe base class and
for correctly opened files.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42114 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
134 lines
3.5 KiB
TeX
134 lines
3.5 KiB
TeX
% -----------------------------------------------------------------------------
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% wxStreamBase
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% -----------------------------------------------------------------------------
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\section{\class{wxStreamBase}}\label{wxstreambase}
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This class is the base class of most stream related classes in wxWidgets. It must
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not be used directly.
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\wxheading{Derived from}
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None
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\wxheading{Include files}
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<wx/stream.h>
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\wxheading{See also}
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\helpref{wxStreamBuffer}{wxstreambuffer}
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% -----------------------------------------------------------------------------
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% Members
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% -----------------------------------------------------------------------------
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\latexignore{\rtfignore{\wxheading{Members}}}
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% -----------
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% ctor & dtor
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% -----------
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\membersection{wxStreamBase::wxStreamBase}\label{wxstreambasector}
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\func{}{wxStreamBase}{\void}
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Creates a dummy stream object. It doesn't do anything.
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\membersection{wxStreamBase::\destruct{wxStreamBase}}\label{wxstreambasedtor}
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\func{}{\destruct{wxStreamBase}}{\void}
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Destructor.
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\membersection{wxStreamBase::GetLength}\label{wxstreambasegetlength}
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\constfunc{wxFileOffset}{GetLength}{\void}
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Returns the length of the stream in bytes. If the length cannot be determined
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(this is always the case for socket streams for example), returns
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\texttt{wxInvalidOffset}.
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\newsince{2.5.4}
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\membersection{wxStreamBase::GetLastError}\label{wxstreambasegetlasterror}
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\constfunc{wxStreamError}{GetLastError}{\void}
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This function returns the last error.
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\twocolwidtha{5cm}
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\begin{twocollist}\itemsep=0pt
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\twocolitem{{\bf wxSTREAM\_NO\_ERROR}}{No error occurred.}
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\twocolitem{{\bf wxSTREAM\_EOF}}{An End-Of-File occurred.}
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\twocolitem{{\bf wxSTREAM\_WRITE\_ERROR}}{A generic error occurred on the last write call.}
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\twocolitem{{\bf wxSTREAM\_READ\_ERROR}}{A generic error occurred on the last read call.}
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\end{twocollist}
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\membersection{wxStreamBase::GetSize}\label{wxstreambasegetsize}
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\constfunc{size\_t}{GetSize}{\void}
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\helpref{GetLength}{wxstreambasegetlength}
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This function returns the size of the stream. For example, for a file it is the
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size of the file.
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\wxheading{Warning}
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There are streams which do not have size by definition, such as socket streams.
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In that cases, GetSize returns $0$ so you should always test its return value.
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\membersection{wxStreamBase::IsOk}\label{wxstreambaseisok}
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\constfunc{virtual bool}{IsOk}{\void}
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Returns true if no error occurred on the stream.
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\wxheading{See also}
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\helpref{GetLastError}{wxstreambasegetlasterror}
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\membersection{wxStreamBase::IsSeekable}\label{wxstreambaseisseekable}
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\constfunc{bool}{IsSeekable}{\void}
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Returns true if the streams supports seeking to arbitrary offsets.
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\membersection{wxStreamBase::OnSysRead}\label{wxstreambaseonsysread}
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\func{size\_t}{OnSysRead}{\param{void*}{ buffer}, \param{size\_t}{ bufsize}}
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Internal function. It is called when the stream wants to read data of the
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specified size. It should return the size that was actually read.
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\membersection{wxStreamBase::OnSysSeek}\label{wxstreambaseonsysseek}
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\func{off\_t}{OnSysSeek}{\param{off\_t}{ pos}, \param{wxSeekMode}{ mode}}
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Internal function. It is called when the stream needs to change the
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current position.
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\membersection{wxStreamBase::OnSysTell}\label{wxstreambaseonsystell}
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\constfunc{off\_t}{OnSysTell}{\void}
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Internal function. Is is called when the stream needs to know the
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real position.
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\membersection{wxStreamBase::OnSysWrite}\label{wxstreambaseonsyswrite}
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\func{size\_t}{OnSysWrite}{\param{const void *}{buffer}, \param{size\_t}{ bufsize}}
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See \helpref{OnSysRead}{wxstreambaseonsysread}.
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