[boost] [Boost-bugs] [ boost-Bugs-1682161 ] iostreams file_descriptor::write fails under Win32

From: SourceForge.net (noreply_at_[hidden])
Date: 2007-03-16 10:30:28

Bugs item #1682161, was opened at 2007-03-16 07:30
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: iostreams file_descriptor::write fails under Win32

Initial Comment:
in 1.33.1, file_descriptor::write(), append mode implemented as

#ifdef BOOST_IOSTREAMS_WINDOWS
    if (pimpl_->flags_ & impl::has_handle) {
        if (pimpl_->flags_ & impl::append) {
            ::SetFilePointer(pimpl_->handle_, 0, NULL, FILE_END);
            if (::GetLastError() != NO_ERROR)
                throw detail::bad_seek();

it is common mistake to call GetLastError() without checking function return value first. MSDN has special note for SetFilePointer():

"Note  If the function returns a value other than INVALID_SET_FILE_POINTER, the call to SetFilePointer has succeeded. You do not need to call GetLastError."

So, file_descriptor::write() fails, if there is old uncleaned "last" error

Regards,

valeri.antonov_at_[hidden]

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