/// <summary>
/// 断开连接，调用需要捕捉异常
/// </summary>
public void DisConnect() //断开和OPCServer的连接，并释放内存
{
try
{
isConnected = false;
isAddGroup = false;
isAddItems = false;
if (IOPCSyncObj != null)
{
Marshal.ReleaseComObject(IOPCSyncObj);
IOPCSyncObj = null;
}
ServerObj.RemoveGroup(pSvrGroupHandle, 0);
if (GroupObj != null)
{
Marshal.ReleaseComObject(GroupObj);
GroupObj = null;
}
if (ServerObj != null)
{
Marshal.ReleaseComObject(ServerObj);
ServerObj = null;
}
}
catch (System.Exception error)
{
MessageBox.Show(error.Message, "断开OPCServer连接出错", MessageBoxButtons.OK,
MessageBoxIcon.Error);
}
}
private void Btn_DisConn_Click(object sender, EventArgs e)
{
try
{
if (IOPCSyncIO20Obj != null)
{
Marshal.ReleaseComObject(IOPCSyncIO20Obj);
IOPCSyncIO20Obj = null;
}
ServerObj.RemoveGroup(pSvrGroupHandle, 0);
if (IOPCGroupStateMgtObj != null)
{
Marshal.ReleaseComObject(IOPCGroupStateMgtObj);
IOPCGroupStateMgtObj = null;
}
if (MyobjGroup1 != null)
{
Marshal.ReleaseComObject(MyobjGroup1);
MyobjGroup1 = null;
}
if (ServerObj != null)
{
Marshal.ReleaseComObject(ServerObj);
ServerObj = null;
}
}
catch (System.Exception error)
{
MessageBox.Show(error.Message, "Result-Stop Server", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
/// <summary>
/// 初始化组对象
/// </summary>
public bool AddGroup() //返回值false为失败，true为成功
{
Int32 dwRequestedUpdateRate = 1000;
Int32 hClientGroup = 1;
Int32 pRevUpdaterate;
float deadband = 0;
int TimeBias = 0;
GCHandle hTimeBias, hDeadband;
hTimeBias = GCHandle.Alloc(TimeBias, GCHandleType.Pinned);
hDeadband = GCHandle.Alloc(deadband, GCHandleType.Pinned);
Guid iidRequiredInterface = typeof(IOPCItemMgt).GUID;
if (!isConnected)
{
if (!Connect())
{
return(false); //如果还没有没有建立连接，先建立连接
}
}
try
{ //ServerObj.AddGroup的返回值类型为void
ServerObj.AddGroup("OPCGroup", 0,
dwRequestedUpdateRate, hClientGroup,
hTimeBias.AddrOfPinnedObject(), hDeadband.AddrOfPinnedObject(),
LOCALE_ID, out pSvrGroupHandle,
out pRevUpdaterate, ref iidRequiredInterface, out GroupObj);
IOPCSyncObj = (IOPCSyncIO)GroupObj;//为组同步读写定义句柄
isAddGroup = true;
}
catch (System.Exception error)
{
isAddGroup = false;
MessageBox.Show(string.Format("创建组对象时出错:-{0}", error.Message), "建组出错",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
finally
{
if (hDeadband.IsAllocated)
{
hDeadband.Free();
}
if (hTimeBias.IsAllocated)
{
hTimeBias.Free();
}
}
return(isAddGroup);
}
int pSvrGroupHandle = 0; //OPCGroup句柄
//连接OPCServer，建立相应OPCGroup组，并添加需要读写的Item
private void Btn_Conn_Click(object sender, EventArgs e)
{
//定义变量
Type svrComponenttype;
Int32 dwRequestedUpdateRate = 1000; //订阅读取速度
Int32 hClientGroup = 1;
Int32 pRevUpdateRate;
OpcRcw.Da.OPCITEMDEF[] ItemArray;
float deadband = 0;
int TimeBias = 0;
//使用C#托管代码时,内存地址和GC回收不需要关心,CLR已经给我们暗箱操作
//如果在C#中调用了非托管代码,比如VC的DLL,而且它有一个回调函数,需要引用C#中的某个对象并操作,这时候需要小心
//要是非托管代码中用到的托管代码那个对象被GC给回收了,这时候就会报内存错误
//所以就要把那个对象钉住"Pin",让它的内存地址固定,而不被垃圾回收掉,然后我们自己管理,自己释放内存,这时候就需要GCHandle
GCHandle hTimeBias, hDeadband;
hTimeBias = GCHandle.Alloc(TimeBias, GCHandleType.Pinned);
hDeadband = GCHandle.Alloc(deadband, GCHandleType.Pinned);
Guid iidRequiredInterface = typeof(IOPCItemMgt).GUID;
try
{
svrComponenttype = Type.GetTypeFromProgID("OPC.SimaticNet", "192.168.0.102"); //OPCServer
ServerObj = (OpcRcw.Da.IOPCServer)Activator.CreateInstance(svrComponenttype); //注册
try
{
ServerObj.AddGroup("MyOPCGroup1", //增加组
0,
dwRequestedUpdateRate,
hClientGroup,
hTimeBias.AddrOfPinnedObject(),
hDeadband.AddrOfPinnedObject(),
LOCALE_ID,
out pSvrGroupHandle,
out pRevUpdateRate,
ref iidRequiredInterface,
out MyobjGroup1);
IOPCSyncIO20Obj = (IOPCSyncIO)MyobjGroup1; //Query interface for sync calls on group object
IOPCGroupStateMgtObj = (IOPCGroupStateMgt)MyobjGroup1;
ItemArray = new OPCITEMDEF[2]; //定义读写的item,共2个变量
ItemArray[0].szAccessPath = "";
ItemArray[0].szItemID = "S7:[S7 conncetion_1]DB10,INT0"; //地址,不同数据类型表示方法不同
ItemArray[0].bActive = 1; //是否激活
ItemArray[0].hClient = 1; //表示ID
ItemArray[0].dwBlobSize = 0;
ItemArray[0].vtRequestedDataType = 2;
ItemArray[1].szAccessPath = "";
ItemArray[1].szItemID = "S7:[S7 connection_1]DB10,STRING14.10";
ItemArray[1].bActive = 1;
ItemArray[1].hClient = 2;
ItemArray[1].dwBlobSize = 0;
ItemArray[1].pBlob = IntPtr.Zero;
ItemArray[1].vtRequestedDataType = 8;
IntPtr pResults = IntPtr.Zero;
IntPtr pErrors = IntPtr.Zero;
try
{
((OpcRcw.Da.IOPCItemMgt)MyobjGroup1).AddItems(2, ItemArray, out pResults, out pErrors);
int[] errors = new int[2];
IntPtr pos = pResults;
ItemServerHandle = new int[2];
Marshal.Copy(pErrors, errors, 0, 2);
if (errors[0] == 0)
{
OPCITEMRESULT result = (OPCITEMRESULT)Marshal.PtrToStructure(pos, typeof(OPCITEMRESULT));
ItemServerHandle[0] = result.hServer;
}
if (errors[1] == 0)
{
pos = new IntPtr(pos.ToInt32() + Marshal.SizeOf(typeof(OPCITEMRESULT)));
OPCITEMRESULT result = (OPCITEMRESULT)Marshal.PtrToStructure(pos, typeof(OPCITEMRESULT));
ItemServerHandle[1] = result.hServer;
}
}
catch (System.Exception error)
{
MessageBox.Show(error.Message, "Result-Adding Items", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
finally
{
//free the memory
if (pResults != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(pResults);
pResults = IntPtr.Zero;
}
if (pErrors != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(pErrors);
pErrors = IntPtr.Zero;
}
}
}
catch (System.Exception error)
{
MessageBox.Show(String.Format("Error while creating group object:-{0}", error.Message), "Result-Add group", MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Error);
}
finally
{
if (hDeadband.IsAllocated)
{
hDeadband.Free();
}
if (hTimeBias.IsAllocated)
{
hTimeBias.Free();
}
}
}
catch (System.Exception error)
{
MessageBox.Show(String.Format("Error while creating server object:-{0}", error.Message), "Result-Create Server", MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Error);
}
}
