Vb到C＃DLL库的问题 [英] Vb to C# DLL library problem

问题描述

你好。

从一段时间以来，我试图解决这个问题而没有任何成功。

任何帮助都将不胜感激。



我有外部库DLL，需要的方法对输入进行一些计算并给我输出（我没有访问代码）

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调用此库的工作excel VB脚本是

Hello.
From some time I try to solve this problem without any success.
Any help would be greatly appreciated.

I have external library DLL with needed methods to do some calculation on inputs and gives me the output (I don't have acces to code)
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The working excel VB script to call this library is

Dim Inputs() As Double
Dim Outputs() As Variant
ReDim Inputs(1 To 1, 1 To NbrInputs&)
For i& = 1 To NbrInputs&
Inputs(1, i&) = CDbl(InRange(i&).Value)
Next i&

ABC.CalculateMatrix(Inputs#, Outputs)

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我在使用C＃连接库时遇到很大问题

该方法应该在C＃

ABC.CalculateMatrix（ref System.Array，ref System.Array）

输入和输出数组似乎不起作用。我已经尝试了几乎所有的东西



我尝试了什么：

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I have great problem interfacing the library with C#
the method should be in C#
ABC.CalculateMatrix(ref System.Array, ref System.Array)
The input and output arrays do not seem to work.I've tried nearly everything

What I have tried:

Double[] Inputs = new Double[4];
Object[] Outputs = new Object[1]; 
ABC.CalculateMatrix(Inputs, Outputs);

我得到的错误是

System.Runtime.InteropServices .COMException'

对象变量或未设置块变量

推荐答案

引用：

ReDim Inputs(1 To 1, 1 To NbrInputs&)

那个创建一个具有非零下限的二维数组。要在C＃中复制它，您需要：

That creates a two-dimensional array with a non-zero lower bound. To duplicate that in C#, you would need:

Array Inputs = Array.CreateInstance(
    typeof(double), 
    new[] { 1, NbrInputs }, // lengths
    new[] { 1, 1 });        // lower bounds

for (int i = 1; i <= NbrInputs; i++)
{
    double value = Convert.ToDouble(InRange[i].Value);
    
    // NB: Can't use indexer to set the value for a non-zero lower bound:
    Inputs.SetValue(value, 1, i);
}

从您发布的代码中不清楚需要传递给输出的内容参数。您需要查看第三方代码的文档，看看是否能为您提供任何线索。

It's not clear from the code you've posted what needs to be passed to the Outputs parameter. You would need to check the documentation of the third-party code to see if that gives you any clues.

ABC.CalculateMatrix需要参考：

ABC.CalculateMatrix expects references:

System.Array Inputs = Array.CreateInstance(typeof(Double), 4);
System.Array Outputs = Array.CreateInstance(typeof(Object), 1);
ABC.CalculateMatrix(ref Inputs, ref Outputs);

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