>>*lpNumberOfBytes == 0.
>>
>>Now - here's the rub - what's to prevent *lpNumberOfBytes being 0 in
>>case 3? the docs say in case 3, the value in *lpNumberOfBytes is not
>>set by GetQueuedCompletionStatus(). So, it would retain whatever value
>>I set it to originally. I'm thinking then that I need to set
>>*lpNumberOfBytes to a value, say 1, and then if it's different, I'll be
>>able to *know* it was set to 0.
Not true. As per the documentation in condition 3 sets the number of bytes read. If there is an error and 0 bytes have been read, it will be set to 0.
Setting a value of 1 would lead to problems for the same reason, what if 1 byte was read? -1 could be an option
Really though, the difference between case 3 and 4 is that GetLastError() returns an error code in case 3, and it does not return an error code in case 4
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