bool Read(void *buf, size_t len)
{
//ReadFile
//If the function succeeds, the return value is nonzero (TRUE).
//If the function fails, or is completing asynchronously, the return value is zero (FALSE). To get extended error information, call the GetLastError function.
//Note The GetLastError code ERROR_IO_PENDING is not a failure; it designates the read operation is pending completion asynchronously. For more information, see Remarks.
//Comments:
//On Windows XP (at least) we have ReadFile returning TRUE and still initiating async iocp operation.
if(log_level) std::cerr << "BlockwiseImpl::Read " << timeout.time_left()<< std::endl;
BOOL read_ret = ReadFile(hCom, buf, len, 0, (OVERLAPPED*)&read_over);
if(!read_ret && GetLastError() != ERROR_IO_PENDING) {
HandleLastError("ReadFile");
return true;
}
return false;;
}
