请教达人，为何RasEnumConnections没返回正确的结果？我只是想让程序自己断开（一个）网络连接而已

[rdcvgt]

HRASCONN hRasConnect;
DWORD dwBuffferSize, dwNumofConnections; //缓冲区大小，连接数
//lpRasConn[0].dwSize = sizeof(RASCONN);
dwBuffferSize = sizeof(RASCONN);//求出RASCONN结构构成的缓冲区大小
LPRASCONN lpRasConn = (LPRASCONN)malloc((UINT)dwBuffferSize);
//此函数若成功则返回零。
RasEnumConnections(lpRasConn, &dwBuffferSize, &dwNumofConnections);
for(DWORD i=0; i<dwNumofConnections ;i++){
//RASCONN结构的hrasconn成员为RAS连接句柄
hRasConnect = lpRasConn[i].hrasconn;
RasHangUp(hRasConnect);
::Sleep(2000);
}

[djfu]

MSDN 参考这个：

If a connection was made without specifying a phone-book entry name, the information returned for that connection gives the connection phone number preceded by ".".

The following sample code enumerates the current RAS connection. This code assumes that, at most, only one connection is currently active. Note that the code sets the dwSize member of the RASCONN structure to specify the version of the structure.

RASCONN * lpRasConn;
DWORD lpcb;
DWORD lpcConnections;

lpRasConn = (LPRASCONN) GlobalAlloc(GPTR, sizeof(RASCONN));
lpRasConn->dwSize = sizeof(RASCONN);
lpcb = sizeof(RASCONN);

nRet = RasEnumConnections(lpRasConn, &lpcb, &lpcConnections);
if (nRet != 0)
{
printf("RasEnumConnections failed: Error = %d", nRet);
}
else
{
printf("The following RAS connections are currently active\n\n");
for (i = 0; i < lpcConnections; i++)
{
printf("Entry name: %s\n", lpRasConn->szEntryName);
lpRasConn++;
}
}