did not emit bytesWritten() on windows.

What steps will reproduce the problem?
1. somethimes, did not emit bytesWritten() 
2.
3.

What is the expected output? What do you see instead?

What version of the product are you using? On what operating system?
lastest

Please provide any additional information below.

Bellow is changed the overlapped event checking routine.
in win_qextserialport.cpp

void QextSerialPort::onWinEvent(HANDLE h)
...
#if 0//original
if (GetOverlappedResult(Win_Handle, o, & numBytes, false)) {
                    overlapsToDelete.append(o);
                    totalBytesWritten += numBytes;
                } else if( GetLastError() != ERROR_IO_INCOMPLETE ) {
                    overlapsToDelete.append(o);
                    qWarning() << "CommEvent overlapped write error:" << GetLastError();
                }

#else //changed 
bool result = false;
do
{
    result = GetOverlappedResult(Win_Handle, o, & numBytes, false);
    if(result)
    {
        overlapsToDelete.append(o);
        totalBytesWritten += numBytes;
        break;
    }
    else if (GetLastError() != ERROR_IO_INCOMPLETE)
    {
        overlapsToDelete.append(o);
        qWarning() << "CommEvent overlapped write error:" << GetLastError();
        break;
    }
}while(!result);
#endif

Original issue reported on code.google.com by tyranno1223 on 23 Aug 2011 at 7:33

np43 / qextserialport

did not emit bytesWritten() on windows. #103