linux中brightness怎么用open控制

在Linux中，可以通过OpenAPI来控制屏幕亮度。具体的实现方式如下：

1. 首先，需要安装OpenAPI的SDK和相关的依赖库。可以参考OpenAPI的官网，下载并安装最新版本的SDK。

2. 接下来，需要编写一个调用OpenAPI的程序，来控制屏幕亮度。可以使用C或C++等语言来编写程序。以下是一个简单的示例程序：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>

#define API_KEY "YOUR_API_KEY"
#define DEVICE_ID "YOUR_DEVICE_ID"
#define BRIGHTNESS_URL "https://api.smartthings.com/v1/devices/" DEVICE_ID "/commands"

struct MemoryStruct {
    char *memory;
    size_t size;
};

static size_t WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp) {
    size_t realsize = size * nmemb;
    struct MemoryStruct *mem = (struct MemoryStruct *)userp;

    mem->memory = realloc(mem->memory, mem->size + realsize + 1);
    if (mem->memory == NULL) {
        printf("not enough memory (realloc returned NULL)\n");
        return 0;
    }

    memcpy(&(mem->memory[mem->size]), contents, realsize);
    mem->size += realsize;
    mem->memory[mem->size] = 0;

    return realsize;
}

int main(void) {
    CURL *curl;
    CURLcode res;
    struct MemoryStruct chunk;
    chunk.memory = malloc(1);
    chunk.size = 0;

    curl_global_init(CURL_GLOBAL_ALL);

    curl = curl_easy_init();
    if (curl) {
        struct curl_slist *headers = NULL;
        headers = curl_slist_append(headers, "Content-Type: application/json");
        headers = curl_slist_append(headers, "Authorization: Bearer " API_KEY);
        char *data = "{\"commands\":[{\"component\":\"main\",\"capability\":\"switchLevel\",\"command\":\"setLevel\",\"arguments\":[80]}]}";
        curl_easy_setopt(curl, CURLOPT_URL, BRIGHTNESS_URL);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
        res = curl_easy_perform(curl);
        if (res != CURLE_OK) {
            fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
        }
        else {
            printf("%s", chunk.memory);
        }
        curl_slist_free_all(headers);
        curl_easy_cleanup(curl);
    }
    free(chunk.memory);

    curl_global_cleanup();
    return 0;
}

3. 在程序中，首先需要替换API_KEY和DEVICE_ID这两个宏定义为自己的值。然后，程序会使用curl库来发送一个HTTP POST请求，来设置屏幕亮度。具体的请求参数可以根据自己的实际需求进行修改。

4. 编译并运行程序，即可控制屏幕亮度了。