将 C++ 字符串/wchar_t* 转换为 C# 字符串?

问题描述

问题:我需要从 C++ 可执行文件中调用 C# dll.我使用 COM，它适用于 int、long 和 bool.但我无法得到一个字符串...

Question: I need to call a C# dll from a C++ executable. I use COM, and it works fine for int, long and bool. But I can't get a string along...

IDL 文件说它是一个 BSTR，但我无法正确传递它，也没有检索到它.我尝试像使用 VB6 一样使用 wchar_t* 和 sysalloc，但这似乎不起作用.

The IDL file says it's a BSTR, but I can't pass it correctly, and neither retrieve one. I tried using wchar_t* and using sysalloc as I did with VB6, but that doesn't seem to work.

任何人都知道怎么做，或者可能出了什么问题?

Anybody knows how, or what might be wrong ?

推荐答案

如果你使用 ATL，你可以这样做:

If you're using ATL you can do this:

std::string theString = "hello";
CComBSTR bstr(theString.c_str());
DoSomething(bstr);  // Function that takes a BSTR as an argument

或者如果没有 ATL:

Or if no ATL:

const wchar_t* theString = L"hello";
BSTR bstr = SysAllocString(theString);
DoSomething(bstr);
SysFreeString(bstr);

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