将C ++ string / wchar_t *转换为C＃string？ [英] Converting C++ string/wchar_t* to C# string?

问题描述

问题：我需要从C ++可执行文件调用C＃dll。
我使用COM，它适用于int，long和bool。但我不能得到一个字符串...

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，但我不能正确传递，也不检索一个。
我试着使用wchar_t *和使用sysalloc像我做VB6，但是似乎不工作。

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.

任何人都知道如何，或什么可能错误？

Anybody knows how, or what might be wrong ?

推荐答案

如果您使用的是ATL，您可以这样做：

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：

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

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