如何共享C＃和C ++代码之间保持恒定？ [英] How do I share a constant between C# and C++ code?

问题描述

我正在写使用C＃和WCF一个和C ++ WWSAPI第二两个过程。我希望能够以定义的地址在一个地方被用于通信的两者之间，并有C＃和Visual C ++使用它。这可能吗？

I'm writing two processes using C# and WCF for one and C++ and WWSAPI for the second. I want to be able to define the address being used for communication between the two in a single place and have both C# and C++ use it. Is this possible?

在一个IDL我来是定义常量最接近的，然后使用MIDL和TLBIMP得到它为可以由C＃消耗一个DLL 。然而，这似乎并没有暴露不变，或者至少我无法弄清楚如何使它这样做。也许它仅限于只键入定义。

The closest I've come is defining the constant in an IDL, then using MIDL and TLBIMP to get it into a DLL that can be consumed by C#. However this doesn't seem to expose the constant, or at least I can't figure out how to make it do so. Maybe it is limited to type definitions only.

任何其他建议？

推荐答案

C＃和C ++有不同的模型常数。典型地，该常数甚至不会在所得的C ++二进制发射 - 在需要的大部分时间它的自动替换

C# and C++ have differing models for constants. Typically, the constant won't even be emitted in the resulting C++ binary -- it's automatically replaced where it is needed most of the time.

而不是使用恒定的，做一个函数返回常量，你可以p / Invoke从C＃。

Rather than using the constant, make a function which returns the constant, which you can P/Invoke from C#.

因此，

#include <iostream>
const double ACCELERATION_DUE_TO_GRAVITY = 9.8;
int main()
{
     std::cout << "Acceleration due to gravity is: " << 
         ACCELERATION_DUE_TO_GRAVITY;
}

变为

becomes

#include <iostream>
extern "C" double AccelerationDueToGravity()
{
    return 9.8;
}
int main()
{
     std::cout << "Acceleration due to gravity is: " << 
         AccelerationDueToGravity();
}

你应该可以的P / Invoke从C＃。

which you should be able to P/Invoke from C#.

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