如何在native层获取屏幕亮度

#include “napi/native_api.h” 
#include <iostream> 
 
#define LOG_TAG “NAPI_HELLO_CPP” 
#include “hilog/log.h” 
 
static napi_value success(napi_env env, napi_callback_info info) { 
size_t argc = 1; 
napi_value args[1] = {nullptr}; 
 
napi_status get = napi_get_cb_info(env, info, &argc, args, nullptr, nullptr); 
 
napi_value obj = args[0]; 
napi_value key; 
napi_value rv; 
std::string x = “value”; 
napi_create_string_utf8(env, x.c_str(), 5, &key); 
napi_get_property(env, obj, key, &rv); 
 
uint32_t result; 
napi_get_value_uint32(env, rv, &result); 
OH_LOG_INFO(LOG_APP, “napi get brightness %{public}d”, result); 
return nullptr; 
} 
static napi_value fail(napi_env env, napi_callback_info info) { return nullptr; } 
 
static napi_value complete(napi_env env, napi_callback_info info) { return nullptr; }
核心代码2：
static napi_value NapiLoadModule(napi_env env, napi_callback_info info) { 
napi_value result; 
 
size_t argc = 1; 
napi_value args[1] = {nullptr}; 
napi_status get = napi_get_cb_info(env, info, &argc, args, nullptr, nullptr); 
 
char path[64] = {0}; 
size_t typeLen = 0; 
napi_get_value_string_utf8(env, args[0], path, sizeof(path), &typeLen); 
 
napi_status status = napi_load_module(env, path, &result); 
if (status != napi_ok) { 
OH_LOG_ERROR(LOG_APP, “napi_load_module failed”); 
return nullptr; 
} 
 
napi_value outputObject; 
napi_get_named_property(env, result, “getValue”, &outputObject); 
 
napi_value arg; 
napi_create_object(env, &arg); 
napi_property_descriptor desc[] = { 
{“success”, nullptr, success, nullptr, nullptr, nullptr, napi_default, nullptr}, 
{“fail”, nullptr, fail, nullptr, nullptr, nullptr, napi_default, nullptr}, 
{“complete”, nullptr, complete, nullptr, nullptr, nullptr, napi_default, nullptr}}; 
napi_status define = napi_define_properties(env, arg, sizeof(desc) / sizeof(desc[0]), desc); 
 
napi_status call = napi_call_function(env, result, outputObject, 1, &arg, nullptr); 
 
return result; 
} 
 
EXTERN_C_START 
static napi_value Init(napi_env env, napi_value exports) { 
napi_property_descriptor desc[] = { 
{“napiLoadModule”, nullptr, NapiLoadModule, 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}, 
};
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import testNapi from ‘libentry.so’; 
 
@Entry 
@Component 
struct Index { 
@State message: string = ‘Hello World’; 
 
build() { 
Row() { 
Column() { 
Text(this.message) 
.fontSize(50) 
.fontWeight(FontWeight.Bold) 
.onClick(() => { 
console.log(“chenlin click”) 
testNapi.napiLoadModule("@system.brightness"); 
}) 
} 
.width(‘100%’) 
} 
.height(‘100%’) 
} 
}
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