小弟自己建立网络连接点，
但是在这之前要断开当前正在使用的连接，请教各位高手，
怎样判断当前使用连接，并且断开该连接。
------解决方案--------------------
- C/C++ code
/*******************************************************************@func 挂断所有拨号连接，包括自己建立的或其它程序建立的*@param 无*@ret TRUE,动作成功；FALSE,动作失败******************************************************************/BOOL CConnectMgr::hangup(){ BOOL bRet = FALSE; LPBYTE pBuffer = NULL; DWORD dwStatus; //释放自己建立的连接 if(CConnectMgr::m_ConnHandle) { ConnMgrReleaseConnection(CConnectMgr::m_ConnHandle, 0); CConnectMgr::m_ConnHandle = 0; bRet = TRUE; } //枚举存在的连接方式 DWORD dwSize; int hr = ConnMgrQueryDetailedStatus(NULL, &dwSize); if(STRSAFE_E_INSUFFICIENT_BUFFER != hr) { goto errorOut; } pBuffer = new BYTE[dwSize]; if(NULL == pBuffer) { goto errorOut; } hr = ConnMgrQueryDetailedStatus((CONNMGR_CONNECTION_DETAILED_STATUS*)pBuffer, &dwSize); if(S_OK == hr) { CONNMGR_CONNECTION_DETAILED_STATUS* cmStatus = (CONNMGR_CONNECTION_DETAILED_STATUS*)pBuffer; while(NULL != cmStatus) { //找到其它程序建立的连接，占有之 if(cmStatus->dwType == CM_CONNTYPE_CELLULAR && cmStatus->dwConnectionStatus == CONNMGR_STATUS_CONNECTED) { CONNMGR_CONNECTIONINFO ConnInfo={0}; ConnInfo.cbSize =sizeof(ConnInfo); ConnInfo.dwParams =CONNMGR_PARAM_GUIDDESTNET; ConnInfo.dwPriority =CONNMGR_PRIORITY_USERINTERACTIVE ; ConnInfo.bExclusive = TRUE; //独占模式 ConnInfo.guidDestNet= cmStatus->guidDestNet; hr = ConnMgrEstablishConnectionSync(&ConnInfo, &CConnectMgr::m_ConnHandle, TIMEOUT_DIAL, &dwStatus); if(S_OK == hr) { //占有之后，释放之 ConnMgrReleaseConnection(CConnectMgr::m_ConnHandle, 0); bRet = TRUE; /*hr = ConnMgrConnectionStatus(CConnectMgr::m_ConnHandle, &dwStatus); if(hr == S_OK && dwStatus == CONNMGR_STATUS_CONNECTED) { bRet = TRUE; break; }*/ } else { bRet = FALSE; goto errorOut; } } cmStatus = cmStatus->pNext; } } errorOut: if(pBuffer) delete[] pBuffer; return bRet;}
------解决方案--------------------
hangup断开方式如下：
- C# code
private void Disconnection() //断开网络 { RASManager.RASCONN[] conns = RASManager.GetRASConnections(); if (conns != null && conns.Length > 0) { foreach (RASManager.RASCONN conn in conns) { try { RASManager.HangUp(conn.hRasConnHandle); } catch (Exception ex) { Log.Write("ChangeNetConnection #5 断开网络失败 " + ex.Message + "\r\n" + ex.StackTrace); throw new Exception(ex.Message); } } } } public static RASCONN[] GetRASConnections() { RASCONN[] retval = null; int size = Marshal.SizeOf(typeof(RASCONN)); int cb = size; int iConnections = 0; IntPtr pConnections = IntPtr.Zero; bool retry = false; do { try { if (pConnections != IntPtr.Zero) { try { Marshal.FreeHGlobal(pConnections); } catch { } } pConnections = Marshal.AllocHGlobal(cb); Marshal.Copy(BitConverter.GetBytes(size), 0, pConnections, 4); //pConnections->size = size; int ret = RasEnumConnections(pConnections, ref cb, ref iConnections); if (ret != 0) //ERROR_BUFFER_TOO_SMALL { retry = true; } else if(ret==0) { retry = false; if (iConnections > 0) { retval = CreateArrayOfType<RASCONN>(pConnections, size, iConnections); } } else { throw new Exception(string.Format("RasEnumConnections failed: Error {0}", ret)); } } finally { if (pConnections != IntPtr.Zero) { Marshal.FreeHGlobal(pConnections); } } } while (retry); return retval; }public static void HangUp(IntPtr hSession) { int lStatus = RasHangUp(hSession); if (lStatus != 0) { throw new Exception(string.Format("RasHangUp failed: Error {0}", lStatus)); } }