从托管C#到非托管C++代码的回调

我正在触发我的C#代码并启动对非托管C++代码的调用。非托管代码中存在回调。

下面是我初始化委托的c#代码。但不幸的是，我得到了垃圾值。我不知道它是否能正常工作。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ConnectToScriptEngineDll
{
public class ConnectToScriptEngine
{
public unsafe delegate  float myCallBackPtr(float** tagValue1);


[DllImport("LTscriptenginedll.dll", CallingConvention = CallingConvention.StdCall)]
public static extern unsafe int ConnectLiveData(myCallBackPtr ps, IntPtr* test, int** temp, bool bdiscconectConnection, bool bPyRequest);

public unsafe float StartLiveInfo(string tagNameFromRequest)
{
string tagName = tagNameFromRequest;//"Motor_1.OutPut.VI";
byte[] tagNameByte = Encoding.ASCII.GetBytes(tagName);
IntPtr tagNamePtr = Marshal.UnsafeAddrOfPinnedArrayElement(tagNameByte, 0);
IntPtr[] tagNameIntPtr = new IntPtr[2];
tagNameIntPtr[0] = tagNamePtr;
tagNameIntPtr[1] = IntPtr.Zero;
int tagValueTemp = 0;
int*[] tagValuePtr = new int*[2];
tagValuePtr[0] = &tagValueTemp;
tagValuePtr[1] = null;
float test;
fixed (int** tagValue1 = tagValuePtr)
{
fixed (IntPtr* tagName1 = tagNameIntPtr)
{
try
{
myCallBackPtr obj = new myCallBackPtr(CallMethod);

var finalTagValue = ConnectLiveData(obj, tagName1, tagValue1, false, true);
test = Convert.ToSingle(*tagValue1[0]);
return test;
}
catch (Exception ex)
{
return 0;
}
}
}
}
public unsafe static float CallMethod(float** tagValue1)
{
var test4 = Convert.ToSingle(*tagValue1[0]);
Console.WriteLine("callbacked");
return test4;
}
}
}

下面是C++方法代码

USE_SE short ConnectLiveData(void* pCallBack, const char** pszTagNames, const int** pnTagAddress,
bool bdiscconectConnection, bool bPyRequest)
{
short lnResult = -1;
Lstring lsErrorMsg;
if (NULL == g_pLiveDataChannel)
{
g_pLiveDataChannel = new CLiveDataChannel("", g_bIncomingLogEnableFlag, g_bOutgoingLogEnableFlag);
g_nLiveDataChannelsCount++;
}
CSLCallInfo* lpcSLCall = new CSLCallInfo(pszTagNames, pnTagAddress, (onDPConnectdata)pCallBack, bPyRequest);
if (lpcSLCall->m_nTagCount > 100)
{
lsErrorMsg = "Invalid number of parameters received for StartLiveCall TagName = " + lpcSLCall->m_sTagNamesKey;
ST_LOG_DATA_BASE(ERROR_MSG, APP_NAME, (char*)lsErrorMsg.c_str());
delete lpcSLCall;
lpcSLCall = NULL;
return lnResult;
}
if (lpcSLCall->m_sTagNamesKey.empty())
{
lsErrorMsg = "Failed start StartLiveCall - fiiled to create CSLCallInfo key : TagName = " + lpcSLCall->m_sTagNamesKey;
ST_LOG_DATA_BASE(ERROR_MSG, APP_NAME, (char*)lsErrorMsg.c_str());
delete lpcSLCall;
lpcSLCall = NULL;
return lnResult;
}
lnResult = g_pLiveDataChannel->InitLiveDataCall(lpcSLCall, pszTagNames, pnTagAddress);
if (lnResult >= 0)
{
g_mLiveDataChannelMutex.lock();
g_LiveDataChannelsList.insert(std::pair<Lstring, Lpair<CLiveDataChannel*, Lstring>>
(lpcSLCall->m_sTagNamesKey, Lpair<CLiveDataChannel*, Lstring>(g_pLiveDataChannel, "")));
g_mLiveDataChannelMutex.unlock();
}
else
{
delete lpcSLCall;
lpcSLCall = NULL;
}
return lnResult;
}