Error 2664 CannotConvert Int To LPDWORD

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I'm getting an error on this line...

C++

if (WSAIoctl(sniffer, SIO_RCVALL, &j, sizeof(j), 0, 0, &in, 0, 0) == SOCKET_ERROR)
{

the &in is in red squiggles.

Posted 17-Aug-11 12:29pm

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Espen Harlinn · Accepted Answer · 2011-08-17T12:45:00

Solution 1

Here is a good example using WSAIoctl Sniffing using Winsock[^]

Best regards
Espen Harlinn

Posted 17-Aug-11 12:45pm

Espen Harlinn

Anthony Mushrow · Accepted Answer · 2011-08-17T13:02:00

It's because a DWORD is an unsigned long, not an int. The compiler will let you off when directly setting a DWORD to an int (by doing an implicit convesion) but it can't do the same for a pointer, so your either going to have to explicitly cast to LPDWORD (Bad, since your'e not guaranteed that they will be the same size) Or pass a pointer to an actual DWORD, even if you just copy your int into a temporary DWORD.