如何声明DLL的导入签名？ [英] How would you declare DLL import signature?

问题描述

这是的随访后使用pHash从.NET

如何声明如下C ++声明.NET？

How would you declare following C++ declaration in .NET?

int ph_dct_imagehash(const char* file,ulong64 &hash);

到目前为止，我

So far i have

[DllImport(@"pHash.dll")]
public static extern int ph_dct_imagehash(string file, ref ulong hash);

不过，我现在收到以下错误

But I am now getting following error for

ulong hash1 = 0, hash2 = 0;
string firstImage = @"C:\Users\dance2die\Pictures\2011-01-23\177.JPG";
string secondImage = @"C:\Users\dance2die\Pictures\2011-01-23\176.JPG";
ph_dct_imagehash(firstImage, ref hash1);
ph_dct_imagehash(secondImage, ref hash2);

这基本上说，我ph_dtc_imagehash的declartion是错误的。
我在做什么错在这里？

It basically says that my declartion of ph_dtc_imagehash is wrong.
What am I doing wrong here?

推荐答案

堆栈失衡表明，C ++ code使用 CDECL 和你的C＃使用 STDCALL 调用约定。改变你的的DllImport 来这样的：

Stack imbalance indicates that the C++ code uses cdecl and your C# uses stdcall calling convention. Change your DLLImport to this:

[DLLImport(@"pHash.dll", CallingConvention=CallingConvention.Cdecl)]

在C＃（返回值和参数）的函数签名，否则正确的。

The function signature in C# (return value and parameters) is otherwise correct.

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