C # calls the C + + export (dllexport) method

Development environment:

Visual Studio 2013+win10

One: Building C + + projects

To build C++project (Win32 project) in VS, be aware that you want to tick:

Application Type:dll

Additional Options:export Symbols

Put the code in the project header file:

#define WAOCVDLL_API __declspec (dllexport)//custom method Extern_c Waocvdll_api int _stdcall Fit (int width, int height, wchar_t*i Mage, Float*firstpoint, int pointslength);

Then implement the method in the CPP file:

Waocvdll_api int _stdcall Fit (int imagewidth, int imageheight, wchar_t*image, float*firstpoint, int pointslength) {//implementation code }

Ps:waocvdll_api different for each project

You need to set the project properties before compiling:

Compile As:compile as C + + code

The platform structure of the Ps:c++ project must be consistent with the invocation of the project (if x64 is x64 and vice versa).

Ok,build project, get DLL

Two: Build the Calling Project (C # Console)

What you should be aware of when calling:

[DllImport (@ "Your DLL storage path", EntryPoint = "method name defined in C + +")]extern static unsafe int Fit (int width, int height, char* image, Floa t* firstpoint, int pointslength);

After that, the unmanaged code is called in C #, and it is important to note that:

1. Set project properties: Allow unsafe code

2. Add unsafe code blocks to your code

OK, run the console project, the project is working properly!

C # calls the C + + export (dllexport) method