互送字符串从C＃和C ++ [英] Interop sending string from C# to C++

问题描述

我想从C＃中的字符串发送到函数在本地C ++ DLL

I want to send a string from C# to a function in a native C++ DLL.

下面是我的代码：
C＃的一面：

Here is my code: The C# side:

[DllImport(@"Native3DHandler.dll", EntryPoint = "#22", 
    CharSet = CharSet.Unicode)]
private static extern void func1(byte[] path);

public void func2(string path)
{
   ASCIIEncoding encoding = new ASCIIEncoding();
   byte[] arr = encoding.GetBytes(path);
   func1(this.something, arr);
}

C ++的一面：

The C++ side:

void func1(char *path)
{
    //...
}

我得到在C ++侧是一个空字符串，每次，不管什么我送。
帮助？

What I get in the C++ side is an empty string, every time, no matter what I send. Help?

感谢。

推荐答案

做工精细我在VS2008没有额外的编组说明：

Works fine for me with no extra marshalling instructions in VS2008:

C＃端：

[DllImport("Test.dll")]
public static extern void getString(StringBuilder theString, int bufferSize);

func()
{
  StringBuilder tstStr = new StringBuilder(BufSize);
  getString(tstStr, BufSize);
}

C ++端：

C++ side:

extern "C" __declspec(dllexport) void getString(char* str, int bufferSize)
{
  strcpy_s(str, bufferSize, "FOOBAR");
}

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