HarmonyOS NEXT开辟：C代码打包so库，napi调用函数及回调 - IT评测·应用市场-qidao123.com技术社区

cmake_minimum_required(VERSION 3.5.0)
project(net)
# SKIP REPATH SETTING. Next four lines are set for skipping repath.
# The fourth line works. Don't know if the third line works.
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -s -ftrapv -D_FORTIFY_SOURCE=2 -O2")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -s -ftrapv -D_FORTIFY_SOURCE=2 -O2")
set(CMAKE_SKIP_BUILD_RPATH_TRUE)
set(CMAKE_SKIP_RPATH TRUE)
# SKIP REPATH SETTING. Next two line is set for skipping repath.
add_compile_options(-fstack-protector-all)
# stack protector and Strip
add_link_options(-s)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}
${CMAKE_CURRENT_SOURCE_DIR}/include)
# 链接静态库（例如需要链接OpenSSL）
link_libraries(${CMAKE_CURRENT_SOURCE_DIR}/lib/${OHOS_ARCH}/libcrypto.a)
link_libraries(${CMAKE_CURRENT_SOURCE_DIR}/lib/${OHOS_ARCH}/libssl.a)
# 将所有.c文件添加进来
file(GLOB_RECURSE SOURCES "./src/*.c")
# 编译为动态库，net是动态库的名称
# SHARED 动态库, STATIC 静态库
add_library(net
SHARED
${SOURCES})
# 包含所有头文件的目录
target_include_directories(net PUBLIC
"${CMAKE_CURRENT_SOURCE_DIR}/include"
"${CMAKE_CURRENT_SOURCE_DIR}/include/openssl"
)
# 添加导入库的查找目录
target_link_directories(net PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/lib/${OHOS_ARCH}/)
# 链接导入库
target_link_libraries(net PUBLIC libssl.a libcrypto.a libace_napi.z.so libhilog_ndk.z.so libnet_connection.so)

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rd /s /Q build_cmake
mkdir build_cmake
cd build_cmake
cmake -DCMAKE_C_COMPILER:FILEPATH=%OHOS_NDK_HOME%\llvm\bin\clang.exe -DCMAKE_CXX_COMPILER:FILEPATH=%OHOS_NDK_HOME%\llvm\bin\clang++.exe -DCMAKE_TOOLCHAIN_FILE=%OHOS_NDK_HOME%\build\cmake\ohos.toolchain.cmake -DCMAKE_MAKE_PROGRAM=%OHOS_NDK_HOME%\build-tools\cmake\bin\ninja.exe -DOHOS_ARCH=arm64-v8a -DOHOS_STL=c++_shared .. -G Ninja
cmake --build .
cd /d %~dp0

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int get_client_ip(char*** client_ip, int* ip_size);

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#include "aaa.h"//为了方便使用C库里面的一些结构体和宏定义，把头文件拷贝过来并引用
#include "dlfcn.h"
#undef LOG_TAG
#define LOG_TAG "NapiTest"
#define NATIVE_PATH "/data/storage/el1/bundle/libs/arm64/libnet.so"//这个路径可以在上层通过context获取，目前是固定的
void *native_lib = nullptr;
#define GET_NAPI_ERROR() \
const napi_extended_error_info *errorInfo; \
status = napi_get_last_error_info(gEnv, &errorInfo); \
if (status == napi_ok) { \
OH_LOG_ERROR(LOG_APP, "last error info : %{public}s", errorInfo->error_message); \
} else { \
OH_LOG_ERROR(LOG_APP, "get last error error"); \
}
typedef int (*GetClientIP)(char ***client_ip, int *ip_size);
static napi_value getClientIP(napi_env env, napi_callback_info info) {
OH_LOG_INFO(LOG_APP, "getClientIP");
char **client_ip = nullptr;
int ip_size = 0;
napi_value result = nullptr;
if (native_lib == nullptr) {
OH_LOG_INFO(LOG_APP, "arrayGetClientPublicIP native_lib is empty, dlopen");
native_lib = dlopen(NATIVE_PATH, RTLD_LAZY | RTLD_GLOBAL);
if (native_lib == nullptr) {
OH_LOG_ERROR(LOG_APP, "cannot load library: %{public}s", dlerror());
napi_get_undefined(env, &result);
return result;
}
}
dlerror();
GetClientIP getIP = (GetClientIP)dlsym(native_lib, "get_client_ip");
if (dlerror()) {
OH_LOG_ERROR(LOG_APP, "load get_client_ip failed: %{public}s", dlerror());
napi_get_undefined(env, &result);
return result;
}
int value = getIP(&client_ip, &ip_size);
if (value == ERR_SUCCESS) {
OH_LOG_INFO(LOG_APP, "get client ip success, ip_size=%{public}d", ip_size);
napi_value ip_array;
napi_create_array_with_length(env, ip_size, &ip_array);
for (int i = 0; i < ip_size; ++i) {
OH_LOG_INFO(LOG_APP, "client ip[%{public}d]=%{public}s", i, client_ip[i]);
napi_value ip_string;
napi_create_string_utf8(env, client_ip[i], NAPI_AUTO_LENGTH, &ip_string);
napi_set_element(env, ip_array, i, ip_string);
}
result = ip_array;
} else {
OH_LOG_INFO(LOG_APP, "get client ip failed, ret=%{public}d", value);
napi_get_undefined(env, &result);
}
for (int i = 0; i < ip_size; ++i) {
free(client_ip[i]);
}
free(client_ip);
return result;
}
EXTERN_C_START
static napi_value Init(napi_env env, napi_value exports)
{
napi_property_descriptor desc[] = {
{ "getClientIP", nullptr, getClientIP, nullptr, nullptr, nullptr, napi_default, nullptr }
};
napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);
return exports;
}
EXTERN_C_END
static napi_module demoModule = {
.nm_version = 1,
.nm_flags = 0,
.nm_filename = nullptr,
.nm_register_func = Init,
.nm_modname = "entry",
.nm_priv = ((void*)0),
.reserved = { 0 },
};
extern "C" __attribute__((constructor)) void RegisterEntryModule(void)
{
napi_module_register(&demoModule);
}

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cmake_minimum_required(VERSION 3.5.0)
project(NativeDemo)
set(NATIVERENDER_ROOT_PATH ${CMAKE_CURRENT_SOURCE_DIR})
if(DEFINED PACKAGE_FIND_FILE)
include(${PACKAGE_FIND_FILE})
endif()
include_directories(${NATIVERENDER_ROOT_PATH}
${NATIVERENDER_ROOT_PATH}/include)
link_libraries(${NATIVERENDER_ROOT_PATH}/../../../libs/${OHOS_ARCH}/libnet.so)
add_library(entry SHARED napi.cpp)
target_link_libraries(extry PUBLIC libace_napi.z.so libhilog_ndk.z.so libnet.so libnet_connection.so)

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export const getClientIP: () => Array<string>

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import testNapi from 'libentry.so';
@Entry
@Component
struct Index {
@State message: string = ''
build() {
Row() {
Column() {
Button('Get Client IP')
.fontSize(20)
.onClick(() => {
this.message = testNapi.getClientIP().toString()
})
Text(this.message)
.fontSize(20)
.margin({ top: 20 })
}
.width('100%')
}
.height('100%')
}
}

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