Is there a locking method for resolving a host in WINAPI?

Question

There getaddrinfo() for blocking host permissions, but is there a blocking method?

Answer 1

I don’t think there is such a thing, but you can always wrap it in a stream and use a semaphore to complete the signal.

Answer 2

Linux has getaddrinfo_a() . See the StackOverflow getaddrinfo-a tag, for example this question "How to use getaddrinfo_a to solve async using glibc" . But I assume this is not applicable for Windows.

There is a cross-platform c-ares library for asynchronous DNS queries that says it works on Windows. (I have not tried it myself.)

Answer 3

On the MSDN page in GetAddrInfoEx, the OVERLAPPED parameter reports

"On Windows 7 and Windows Server 2008 R2 or earlier, this parameter is currently reserved and must be set to NULL because asynchronous operations are not supported."

This means that you can only use the OVERLAPPED function in Windows 8 and later. If Steve cannot show that he works in the old version of windows ...

Answer 4

On Windows Vista and Windows Server 2008, you can use GetAddrInfoEx with OVERLAPPED .

Once the hEvent event is set in the OVERLAPPED structure, use GetAddrInfoExOverlappedResult .