用out int和ref int 都可以。
[DllImport("wininet.dll", CharSet=CharSet.Auto)]
public static int InternetDial (
IntPtr hwndParent,
string lpszConnectoid,
int dwFlags,
out int lpdwConnection,
int dwReserved);
[DllImport("wininet.dll", CharSet=CharSet.Auto)]
public static int InternetDial (
IntPtr hwndParent,
string lpszConnectoid,
int dwFlags,
out int lpdwConnection,
int dwReserved);
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