How to create a static library of C/C++ for Xamarin projects targeting Tizen, Android, and iOS

Problem Understanding

The user wants to create a static library from existing C/C++ code that can be used in Xamarin projects targeting multiple platforms including Tizen, Android, and iOS.

Solution Methods

1. Creating the Shared Library in Tizen Studio

   • Open Tizen Studio and select File > New > Tizen Project > Template
   • Select Target device and Tizen version (e.g., Wearable 4.0 for Galaxy Watch)
   • Choose Native App > Shared Library
   • Set the target architecture in Project Explorer by right-clicking your project and selecting Properties
   • In Properties window, go to C/C++ Build > Tizen Settings and select arm in Platform > Architecture drop-down list
   • Click Apply and Close

2. Integrating with Xamarin.Tizen Project

   • After building your code, copy the output .so file to your C# project's lib directory
   • Use P/Invoke (DllImport) to call the native functions

3. Sample Implementation

   • Create a header file with exported functions using EXPORT_API macro
   • Implement the functions in a C/C++ source file
   • Build the library in Tizen Studio
   • Copy the .so file to your Xamarin.Tizen project's lib directory
   • Use DllImport in C# to call the native functions

Code Examples

Native Library Header (mytizensharedlibrary.h):

#ifndef _MYTIZENSHAREDLIBRARY_H_
#define _MYTIZENSHAREDLIBRARY_H_

#include <stdbool.h>
#include <tizen.h>

#ifdef __cplusplus
extern "C" {
#endif

EXPORT_API void tizenmytizensharedlibrary(int num);

#ifdef __cplusplus
}
#endif
#endif // _MYTIZENSHAREDLIBRARY_H_

Native Library Implementation (mytizensharedlibrary.c):

#include "mytizensharedlibrary.h"
#include <stdio.h>

void tizenmytizensharedlibrary(int num) {
    printf("Hi Tizen! num(%d)\n", num);
}

Xamarin.Tizen Project File (.csproj):

<Project Sdk="Tizen.NET.Sdk/1.0.9">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>tizen40</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <Folder Include="lib\" />
    <Folder Include="res\" />
  </ItemGroup>
</Project>

C# Code to Call Native Function:

[DllImport("libmytizensharedlibrary.so", EntryPoint = "tizenmytizensharedlibrary")]
internal static extern void CallMyLibrary(int num);

protected override void OnCreate() {
    base.OnCreate();
    LoadApplication(new App());
    CallMyLibrary(2020);
}

Additional Tips

• Ensure the .so file is copied to the correct location in your Xamarin.Tizen project
• Verify the architecture settings match your target device
• For Android integration, use AndroidNativeLibrary in the csproj file
• If issues persist, create a simple sample app to reproduce the problem