修改传递给C dll c＃的char数组

Question

我只是试图从C＃传递缓冲区到C dll，让C func填充缓冲区，然后在C＃代码中用缓冲区做一些事情。但我正在缓冲区中回收垃圾。这是C：

    extern "C" __declspec( dllexport )      
    int  cFunction(char *plotInfo, int bufferSize) 
    {
        strcpy(plotInfo, "text");
        return(0);
    }

C＃

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace ConsoleApplication1
{
class Program
{
 [DllImport("mcDll.dll",
     CallingConvention = CallingConvention.Cdecl, CharSet=CharSet.Unicode)]

    public static extern int cFunction( StringBuilder theString, int bufferSize);
    static void Main(string[] args)
    {
        StringBuilder s = new StringBuilder(55);
        int result = cFunction( s, 55);
        Console.WriteLine(s);
    }
   }
}

Answer 1

Native函数使用ANSI字符进行操作。只需从导入定义中删除CharSet.Unicode即可。