C#dll，C ++客户端，传递数组参数 [英] C# dll, C++ client, pass array parameter

问题描述

你好，
我有一个C#DLL，调用如下:

Hello,
I have a C# DLL with a call like this:

[DispId(7)]
void Test([MarshalAs(UnmanagedType.SafeArray,
                      SafeArraySubType = VarEnum.VT_BSTR)] ref string[] s);

在C ++方面，该函数称为:

On the C++ side, the function is called:

SAFEARRAY *sArr1 = NULL;
iface.Test(&sArr1);

我收到一个消息框:参数不正确."

查看输出调试窗口，我看到以下内容:
警告:正在构造COleException，scode = E_INVALIDARG($ 80070057).

有谁知道将数组作为参数，C#DLL和C ++客户端传递的其他方法吗?

任何帮助将不胜感激.


真诚的
Mike

I''m getting a message box: "The parameter is incorrect."

Looking at the output debugging window, I see this:
Warning: constructing COleException, scode = E_INVALIDARG ($80070057).

Does anyone know of other ways to pass an array as a parameter, C# DLL and C++ client?

Any help would be appreciated.


Sincerely,
Mike

推荐答案

80070057).

有谁知道将数组作为参数，C#DLL和C ++客户端传递的其他方法吗?

任何帮助将不胜感激.


真诚的
Mike

80070057).

Does anyone know of other ways to pass an array as a parameter, C# DLL and C++ client?

Any help would be appreciated.


Sincerely,
Mike

好，我找到了解决问题的方法.

OK, I found a solution to my problem.

//C# DLL
public void Test(ref object s)
{
   s = new string[2] { "one", "three" };
}

//C++ call
VARIANT s = COleVariant();
BOOL b = iface.CreateDispatch( ... );  //Parameter omitted for conciseness
iface.Test(&s);

谢谢大家的努力.

Thank you all for your efforts.

诚然，我看不懂C#，但希望您无论如何都能从这篇文章中获得一些帮助.

我注意到的东西；您有一个变量 sArr1 ，它是指向SAFEARRAY的指针.当您调用 Test 函数时，该参数是指向该SAFEARRAY指针的指针.您应该这样称呼:

Admittedly, I can''t read C#, but hopefully you''ll get some help from this post anyway.

Something I noticed; you have a variable sArr1, which is a pointer to a SAFEARRAY. When you call your Test function, the argument is a pointer to this pointer to a SAFEARRAY; you should maybe call it like so:

SAFEARRAY *sArr1 = NULL;
iface.Test(sArr1);

实际上，并不是真的想使用这个双指针.

第二个想法；该消息框来自DLL内部，它可能只是在抱怨NULL值.

It''s not impossible you actually want to use this double pointer though.

Second idea; the message box comes from within the DLL, it may simply be complaining about the NULL-value.

这篇关于C#dll，C ++客户端，传递数组参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！