Using libcurl in C++ android application using CMake

Using libcurl in C++ android application using CMake - android

Maybe there is already some answers on this forum about this problem, but i tried a lot of solutions already, and i still didnt solve this problem.
I have to make an android application using C++, wich uses libcurl.
And whatever i do, i can't run my program because it doenst find the library.
In my .cpp, i use this line :
#include <curl/curl.h>
And this is my CMakeLists.txt
# Sets the minimum version of CMake required to build the native
# library. You should either keep the default value or only pass a
# value of 3.4.0 or lower.
cmake_minimum_required(VERSION 3.4.1)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds it for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
# Associated headers in the same location as their source
# file are automatically included.
src/main/cpp/native-lib.cpp )
# Searches for a specified prebuilt library and stores the path as a
# variable. Because system libraries are included in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
-lcurl
# Specifies the name of the NDK library that
# you want CMake to locate.
log
-lcurl )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in the
# build script, prebuilt third-party libraries, or system libraries.
INCLUDE_DIRECTORIES($/usr/include/)
target_link_libraries( # Specifies the target library.
native-lib
-lcurl
# Links the target library to the log library
# included in the NDK.
${log-lib} )
I used the commands :
sudo aptitude install libcurl4-gnutls-dev
and
sudo aptitude install libcurl-dev

You should rather use the built-in functionality to integrate libcurl:
[...]
find_package(CURL REQUIRED)
include_directories(${CURL_INCLUDE_DIRS})
add_library(native-lib SHARED src/main/cpp/native-lib.cpp)
target_link_libraries(native-lib ${CURL_LIBRARIES})
As it seems you are cross-compiling for Android, the following will make the curl library that you installed for your Ubuntu available for the compilation (add it before what is above).
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH)
But it might then be problematic in the linking step, since you installed the library for your Ubuntu and the program you want to compile it with is for Android.
If this does not work, try to have the curl library in your cross-compiling toolset (but I don't know enough about it to tell you how to do it).

I think you need to instruct cmake to find the libcurl dependency.
Please read How_To_Find_Libraries.
And look at find_package and FindCURL module
As a quick-start, add the following to your CMakeLists.txt:
find_package(CURL REQUIRED)
include_directories(${CURL_INCLUDE_DIRS})
add_library(native-lib SHARED ... )
target_link_libraries(native-lib ${CURL_LIBRARIES})
(even better: use target_include_directories() instead of include_directories()).

Related

How to import FreeType to my Android Studio NDK project using CMake

Hello I am beginner in Android NDK programming and I need some help getting freetype library to work with my project. I've been trying for 3 hours straight to somehow import freetype to my Android Studio project. I searched on the internet and could not find any solution that was working. I downloaded the library and put it in my cpp folder of the project.But I don't know how to include freetype. Any help would be appreaciated!
This is how my CMakeLists.txt look and for the files that I have added it works for them:
cmake_minimum_required(VERSION 3.10.2)
project("firstnative")
include_directories(stb/stb_lib
GoldFlow/Core
GoldFlow/Graphics
GoldFlow/Math
GoldFlow/glm
GoldFlow/glm/gtc
GoldFlow/entt
GoldFlow/physics
GoldFlow/scripts
GoldFlow/freetype/include
GoldFlow/freetype/include/freetype/
GoldFlow/freetype/include/freetype/config
GoldFlow/freetype/include/freetype/internal
GoldFlow/freetype/include/freetype/internal/services
)
add_library(
Native
SHARED
GoldFlow/Math/GoldMath.cpp
GoldFlow/Graphics/Shader.cpp
GoldFlow/Graphics/Renderer2D.cpp
GoldFlow/Graphics/Camera.cpp
GoldFlow/Graphics/Texture.cpp
GoldFlow/Graphics/SpriteSheet.cpp
GoldFlow/Core/Scene.cpp
GoldFlow/Core/GameObject.cpp
GoldFlow/Core/Application.cpp
GoldFlow/Core/Controls.cpp
GoldFlow/Core/Timer.cpp
GoldFlow/physics/AABB.cpp
GoldFlow/physics/Objects.cpp
GoldFlow/scripts/ControllerScript.cpp
GoldFlow/scripts/CharacterMovingScript.cpp
native.cpp)
add_library(
Freetype
SHARED
GoldFlow/freetype/src/autofit/autofit.c
GoldFlow/freetype/src/base/ftbase.c
GoldFlow/freetype/src/base/ftbbox.c
GoldFlow/freetype/src/base/ftbdf.c
GoldFlow/freetype/src/base/ftbitmap.c
GoldFlow/freetype/src/base/ftcid.c
GoldFlow/freetype/src/base/ftfstype.c
GoldFlow/freetype/src/base/ftgasp.c
GoldFlow/freetype/src/base/ftglyph.c
GoldFlow/freetype/src/base/ftgxval.c
GoldFlow/freetype/src/base/ftinit.c
GoldFlow/freetype/src/base/ftmm.c
GoldFlow/freetype/src/base/ftotval.c
GoldFlow/freetype/src/base/ftpatent.c
GoldFlow/freetype/src/base/ftpfr.c
GoldFlow/freetype/src/base/ftstroke.c
GoldFlow/freetype/src/base/ftsynth.c
GoldFlow/freetype/src/base/fttype1.c
GoldFlow/freetype/src/base/ftwinfnt.c
GoldFlow/freetype/src/bdf/bdf.c
GoldFlow/freetype/src/bzip2/ftbzip2.c
GoldFlow/freetype/src/cache/ftcache.c
GoldFlow/freetype/src/cff/cff.c
GoldFlow/freetype/src/cid/type1cid.c
GoldFlow/freetype/src/gzip/ftgzip.c
GoldFlow/freetype/src/lzw/ftlzw.c
GoldFlow/freetype/src/pcf/pcf.c
GoldFlow/freetype/src/pfr/pfr.c
GoldFlow/freetype/src/psaux/psaux.c
GoldFlow/freetype/src/pshinter/pshinter.c
GoldFlow/freetype/src/psnames/psnames.c
GoldFlow/freetype/src/raster/raster.c
GoldFlow/freetype/src/sfnt/sfnt.c
GoldFlow/freetype/src/smooth/smooth.c
GoldFlow/freetype/src/truetype/truetype.c
GoldFlow/freetype/src/type1/type1.c
GoldFlow/freetype/src/type42/type42.c
GoldFlow/freetype/src/winfonts/winfnt.c
)
find_library(
log-lib
log )
find_library(GLES-lib
GLESv3)
target_link_libraries(
Native
${log-lib}
${GLES-lib}
${Freetype}
)
The error I am getting now is this: C:\Users\infer\AndroidStudioProjects\FirstNative\app\src\main\cpp\GoldFlow\freetype\src\base\ftbdf.c:40:14: error: use of undeclared identifier 'FT_ERR_PREFIXInvalid_Face_Handle'; did you mean 'FT_Err_Invalid_Face_Handle'?

Ok the solution was very simple. All I did actually was I created directory in cpp folder named freetype and in that dir I've put every freetype file and just added that folder as sub directory in CMake and linked at the end and now eveyrthing works. Here is my CMake:
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.10.2)
# Declares and names the project.
project("firstnative")
include_directories(stb/stb_lib
GoldFlow/Core
GoldFlow/Graphics
GoldFlow/Math
GoldFlow/glm
GoldFlow/glm/gtc
GoldFlow/entt
GoldFlow/physics
GoldFlow/scripts
GoldFlow/text
)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
Native
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
GoldFlow/Math/GoldMath.cpp
GoldFlow/Graphics/Shader.cpp
GoldFlow/Graphics/Renderer2D.cpp
GoldFlow/Graphics/Camera.cpp
GoldFlow/Graphics/Texture.cpp
GoldFlow/Graphics/SpriteSheet.cpp
GoldFlow/Core/Scene.cpp
GoldFlow/Core/GameObject.cpp
GoldFlow/Core/Application.cpp
GoldFlow/Core/Controls.cpp
GoldFlow/Core/Timer.cpp
GoldFlow/physics/AABB.cpp
GoldFlow/physics/Objects.cpp
GoldFlow/scripts/ControllerScript.cpp
GoldFlow/scripts/CharacterMovingScript.cpp
GoldFlow/text/TextRenderer.cpp
native.cpp)
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
#sd
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
find_library(GLES-lib
GLESv3)
add_subdirectory(freetype)
target_link_libraries( # Specifies the target library.
Native
# Links the target library to the log and gl es library
# included in the NDK.
${log-lib}
${GLES-lib}
freetype
)

How do I include an *.a library file in an Android project with NDK?

I need to make an android program that controls an OTG USB device
I have the device's android library as an *.a (libdevice_api.a) file, and the associated header file (device.h)
The library's documentation is very old and shows a project that uses Android.mk for a sample build, but I would prefer to do this using CMake
How do I include this .a file and the header file in my project using CMake? Currently all my NDK code is in /app/src/main/cpp. As a first sample program, I would ideally like to be able to include the .a file to my project and use the library's getVersion() function to test if it worked. Here is my current CMakeLists.txt file:
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)
#SET ( CMAKE_C_FLAGS_RELEASE "-DCONFIG_RELEASE -O2" )
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
mirics-jni
# Sets the library as a shared library.
SHARED
mirics-jni.cpp )
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
mirics-jni
# Links the target library to the log library
# included in the NDK.
${log-lib} )
include_directories()

Is it possible to hide .so files in Android NDK development?

I am developing an Android app on Android Studio 3.6.1.
I used NDK for the first time today.
When I unzipped my apk, there was a folder for each platform under the lib folder, with a .so file in each folder.
I have a question.
Is it possible to prevent this .so file from being extracted just by extracting apk?
Indeed, reverse-engineering .so files is difficult. However, I don't like the .so file being diverted to steal the return value.
my CMakeLists.txt is...
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
native-lib.cpp )
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
native-lib
# Links the target library to the log library
# included in the NDK.
${log-lib} )
Yes, it is default CMakeLists.txt.
Thanks for your help.

If you can't find it, how would the device find it to run the functions in it? Of course you can't.
And really, if you're worried about that you should see how easily reversible Java and Kotlin are.

Android Studio include cpp headers

CMake can not determine linker language for target: CydiaSubstrate … is the error I am getting. I really don't understand what I am doing wrong nor can I find anything related to adding headers through cmake. Please refer to the code below:
# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
platinmods
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
src/main/cpp/platinmods.cpp )
add_library( # Sets the name of the library.
CydiaSubstrate
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
src/main/cpp/CydiaSubstrate.h )
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
platinmods
# Links the target library to the log library
# included in the NDK.
${log-lib} )
target_link_libraries( # Specifies the target library.
CydiaSubstrate
# Links the target library to the log library
# included in the NDK.
${log-lib} )

you code is trying to build 2 libraries: platinmods and CydiaSubstrate. But if your intension is just to let CydiaSubstrate.h used by platinmods.cpp, your code is not doing what you want. Guessing you want later indeed,
In source code, do #include "CydiaSubstrate.h", and copy your CydiaSubstrate.h into the same directory as platinmods.cpp
Only leave platinmod related code inside build.gradle, delete all CydiaSubstrate related lines
If your header file is not in the same folder as your source file, use CMake's target_include_directories() like this
If you are having source code backing up that header file, you need to add that source file into compile too ( same as platinmods.cpp )
do open CydiaSubstrate.h to see what macro is needed to be defined to use it, that helps.
then do a build->clean, and build ->build apk to see what the problems left ( and fix them ).

You can try with this link which already closed in android-ndk sample or this link by Halim Qarroum in other related post.
Hope it can help you.

Android NDK Cmake Linking .a (Static) Libs

I am using Android Studio 2.2.2 with cmake and Android NDK. I have a problem linking .a library (Static lib).
Here is my cmake:
# Sets the minimum version of CMake required to build the native
# library. You should either keep the default value or only pass a
# value of 3.4.0 or lower.
cmake_minimum_required(VERSION 3.4.1)
set(CMAKE_VERBOSE_MAKEFILE on)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds it for you.
# Gradle automatically packages shared libraries with your APK.
add_library(lib_webp SHARED IMPORTED )
set_target_properties(lib_webp PROPERTIES IMPORTED_LOCATION
src/main/jni/${ANDROID_ABI}/libwebp.so)
add_library( # Sets the name of the library.
game-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
# Associated headers in the same location as their source
# file are automatically included.
src/main/cpp/main.cpp
src/main/cpp/android_native_app_glue.c
)
target_include_directories(game-lib PRIVATE
../../../../libs/headers/android
)
include_directories($ENV{NDK_MODULE_PATH}/sources/android/native_app_glue/)
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in the
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
game-lib
# Links the target library to the log library
# included in the NDK.
# ${log-lib}
# Specifies the name of the NDK library that
# you want CMake to locate.
log
android
OpenSLES
z
GLESv2
EGL
dl
)
add_definitions(-g -DANDROID -Wno-write-strings -fsigned-char -Wno-conversion-null)
TARGET_LINK_LIBRARIES(game-lib libtheoraplayer.a)
My linker reports an error
arm-linux-androideabi/bin\ld: error: cannot find -ltheoraplayer
error: undefined reference to 'TheoraVideoManager::TheoraVideoManager(int)'
which is a part of libtheoraplayer.a. Did anyone had similar problem? Any idea how to solve this?
I have the Static lib libtheoraplayer.a present at that location. I even have the Shared lib also, libtheoraplayer.so but I can`t link it either.
Any advice would be appreciated.
Cheers.

To post the answer. As Tsyvarev said, the problem with non-absolute file name for library. When I used absoulte path it worked like a charm.
Thank you.
Cheers.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.