我在C#中创建一个dll,在调用单个函数runSimulation()时运行模拟。应该从VBA调用此dll,因为某些参数值在Excel中作为输入给出。这是我使用的代码。
C#:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using RGiesecke.DllExport;
namespace Simulation
{
public static class Simulation
{
[ComVisible(true)]
[DllExport("runSimulation", CallingConvention = CallingConvention.Cdecl)]
[return: MarshalAs(UnmanagedType.SysInt)]
public static int runSimulation()
{
// Do simulation
return 0;
}
}
}
上面的代码被编译为类库,x64作为平台目标,并返回Simulation.dll。
VBA:
Public Declare Function runSimulation Lib "Simulation.dll" () As Long
Sub Run_DLL()
ChDir (ActiveWorkbook.Path)
Dim returnValue As Long
returnValue = runSimulation()
End Sub
运行Visual Basic代码返回
运行时错误453:'无法在中找到DLL入口点runSimulation Simulation.dll'
当它试图调用runSimulation()时。
作为参考:我尝试使用
运行[DllExport("runSimulation", CallingConvention = CallingConvention.StdCall)]
相反,但这也不起作用。我还尝试使用https://www.linkedin.com/grp/post/40949-258782989中给出的建议,但它给了我同样的错误。
答案 0 :(得分:2)
我设法在VBA代码中调用'runSimulation'函数,方法是通过C#中的接口公开Simulation类:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace NSSimulation
{
public interface ISimulation
{
int runSimulation();
}
[ComVisible(true)]
[ClassInterface(ClassInterfaceType.None)]
public class Simulation : ISimulation
{
[ComVisible(true)]
public int runSimulation()
{
return 0;
}
}
}
然后重新编译项目并使用'tlbexp.exe'从Visual Studio命令提示符导出重建的库:
tlbexp.exe SimulationLib.dll /out:"SimulationLib.tlb" /win64
然后在Excel中打开Visual Basic编辑器并通过“Tools-> References-> Browse”添加对'SimulationLib.tlb'的引用。验证
Public x As New SimulationLib.Simulation
Sub test()
MsgBox x.runSimulation
End Sub