自定义dll的PInvoke问题 [英] PInvoke issues with custom dll

问题描述

我只是在玩一些PInvoke的东西.尝试运行应用程序时出现AcessViolationException错误.这是我的C ++代码"

I am just playing around with some PInvoke stuff. I am getting an AcessViolationException error when I am trying to run the app. This is my C++ code"

extern "C"
{
  __declspec(dllexport) double DecodeLatitude(string s, bool mustFlip)
  {
    bitset<28> hh(s);
    if (mustFlip) {hh.flip();}
    return hh.to_ulong();
  }
}

这是我的C#代码，调用此代码:

And here is my C# code that calls this:

[DllImport("BinaryConvert.dll", CallingConvention = CallingConvention.Cdecl)]
        public static extern double DecodeLatitude([MarshalAs(UnmanagedType.BStr)]string s, [MarshalAs(UnmanagedType.I1)]bool mustFlip);

static void Main()
        {
            double a = DecodeLongitude("001000110010001110111001100", false);
            Console.ReadLine();
        }

有人可以帮助初学者吗:P

Can someone help a beginner out :P

推荐答案

您需要检查C#和C ++之间不同类型的定义.例如，在此处定义的UnmanagedType.LPStr [

You need to check the definitions for the different types between C# and C++. For example, UnmanagedType.LPStr as defined here[^], is a pointer to a null-terminated array of ANSI characters. This equates to a char* in C++, not a string.

Similarly, you are returning an unsigned long (hh.to_ulong()) to a C# call that expects a Double value to be returned.

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