Vista CreateFile() access denied

In Vista .Ｉ use CreateFile() open a COM port and use it send data
.. But when i use CloseHandle() close it . (closehandle() return is
true)
It's cant use CreateFile() to open again . And error code is 5 (
access denied ).
When i restart the program , it can work.
I have used "Administrator" to run program , but the same error is
occur.
Does someone know what the problem it is? or how to slove ? Thx


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narsace
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Because vista cant keep any file or data in buffer . so before
closehandle() need clean buffer then cloen or it will happen port lock
like me.

i use PurgeComm(handle_ , PURGE_RXABORT | PURGE_RXCLEAR |
PURGE_TXABORT | PURGE_TXCLEAR); CancelIo(handle_); to clean buffer.
thx.


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narsace
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