Teaches you to quickly call C + + code (functions) in C #

previously wrote a C + + code, want to write to him in C # interface, that is to let this code in C # can run. Look at Baidu's many methods, are said to be encapsulated into a DLL call, but follow the steps to always appear a variety of errors, such as the following:

And the delay can not be solved, today unexpectedly someone told me directly to the DLL extracted to the C # project bin file can be, three views are ruined .... Tried a bit, really successful, here to put the concrete steps and everyone to say, to avoid

Waste a lot of time on this issue.

First, let's build a C + + project (in order to get the DLL) and wrap the function you intend to use in C # with the following format extern "C" __declspec (dllexport):

#include <stdio.h> #include <iostream> #include <string.h> #include <string>using namespace std ; void output () {cout << "Hello World" << Endl;} extern "C" __declspec (dllexport) int sum (int a, int b) {output (); return a + b;}

Then right-click on the project name--Properties--Configure Properties--General---> change configuration type to DLL

Then compile, will be the same as the project name of the Debug folder under the DLL extraction, placed in C # project bin file-->debug, run can.

Add the code between the package and the Begin,end, and then call the function directly in the main program.

Using system;using system.collections.generic;using system.linq;using system.text;using System.Threading.Tasks; Using system.runtime.interopservices;//to add namespace csharp{    class program    {         //  begin          [ DllImport ("Tach.dll",          entrypoint = "sum",          CharSet = CharSet.Ansi,          callingconvention = Callingconvention.stdcall)] public          static extern int sum (int a,int b);          End                static void Main (string[] args)          {              int res = SUM (1, 2);              Console.WriteLine (res);}}}    

result, run successfully!

Because there is not a lot of testing, this method may have problems (feeling and online are not the same ...). If this method has errors or everyone has a better way, please leave a message under the blog, hope can help everyone!

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Teaches you to quickly call C + + code (functions) in C #