run cpp code from c-sharp

Author: UnixY2K

README.md

@@ -46,4 +46,23 @@ so you can build a dll that will contain your code that get called from the `C#
 
 For demonstration purposes we will use meson/ninja to create a new `C++ project` and clang or msvc to compile it, but you can use your preferred toolchain (for example CMake) to build the dll.
 
-in this example project it will show a dialog box for simplicity.
+in this example project it will show a dialog box for simplicity.
+
+## Loading c++ code from C#
+
+after the dll is compiled, you can use it from the C# project.
+
+- Copy the `c++ dll(and all the required files)` to the `C# project` binary folder.
+    > This step can be automated with a build script, as it is only needed when you deploy the release of the application.
+- Add the following import to the `C# code`.
+  ```csharp
+  // DllImport
+  using System.Runtime.InteropServices;
+  ```
+- then add the function of the `C++ DLL` in the `C# code` like this:
+  ```csharp
+  // define the DLL entry point from c++ dll (void dllEntry() from myApp.dll)
+    [DllImport("myApp.dll", EntryPoint = "dllEntry")]
+    public static extern void dllEntry();
+  ```
+

csharp/Program.cs

@@ -1,5 +1,8 @@
 namespace csharp;
 
+// DllImport
+using System.Runtime.InteropServices;
+
 // Microsoft AppCenter SDK
 using Microsoft.AppCenter;
 using Microsoft.AppCenter.Analytics;
@@ -19,5 +22,10 @@ static void Main()
         // this is only for demo purposes
         System.Console.WriteLine("App Center Powered.");
         AppCenter.Start("{Your App Secret}", typeof(Analytics), typeof(Crashes));
+        dllEntry();
     }
+
+    // define the DLL entry point from c++ dll (void dllEntry() from myApp.dll)
+    [DllImport("myApp.dll", EntryPoint = "dllEntry")]
+    public static extern void dllEntry();
 }