基于ESP-IDF4.1
1 #include <stdio.h> 2 #include <string.h> 3 #include <sys/unistd.h> 4 #include <sys/stat.h> 5 #include "esp_err.h" 6 #include "esp_log.h" 7 #include "esp_spiffs.h" 8 9 static const char *TAG = "example"; 10 11 void app_main(void) 12 { 13 ESP_LOGI(TAG, "Initializing SPIFFS"); 14 15 esp_vfs_spiffs_conf_t conf = { 16 .base_path = "/spiffs", 17 .partition_label = NULL, 18 .max_files = 5, 19 .format_if_mount_failed = true 20 }; 21 22 //使用上面定义的设置来初始化和挂在spiffs文件系统 23 esp_err_t ret = esp_vfs_spiffs_register(&conf); 24 25 if (ret != ESP_OK) { 26 if (ret == ESP_FAIL) { 27 ESP_LOGE(TAG, "Failed to mount or format filesystem"); 28 } else if (ret == ESP_ERR_NOT_FOUND) { 29 ESP_LOGE(TAG, "Failed to find SPIFFS partition"); 30 } else { 31 ESP_LOGE(TAG, "Failed to initialize SPIFFS (%s)", esp_err_to_name(ret)); 32 } 33 return; 34 } 35 36 size_t total = 0, used = 0; 37 ret = esp_spiffs_info(conf.partition_label, &total, &used); 38 if (ret != ESP_OK) { 39 ESP_LOGE(TAG, "Failed to get SPIFFS partition information (%s)", esp_err_to_name(ret)); 40 } else { 41 ESP_LOGI(TAG, "Partition size: total: %d, used: %d", total, used); 42 } 43 44 //使用POSIX和C标准库函数操作文件 45 //创建一个文件 46 ESP_LOGI(TAG, "Opening file"); 47 FILE* f = fopen("/spiffs/hello.txt", "w"); // 打开只写文件，若文件存在则文件长度清为0，即该文件内容会消失。若文件不存在则建立该文件。 48 if (f == NULL) { 49 ESP_LOGE(TAG, "Failed to open file for writing"); 50 return; 51 } 52 fprintf(f, "Hello World! "); 53 fclose(f); 54 ESP_LOGI(TAG, "File written"); 55 56 //重命名前检查目标文件是否存在 57 struct stat st; 58 if (stat("/spiffs/foo.txt", &st) == 0) { 59 // 如果存在则删除 60 unlink("/spiffs/foo.txt"); 61 } 62 63 // 重命名原始文件 64 ESP_LOGI(TAG, "Renaming file"); 65 if (rename("/spiffs/hello.txt", "/spiffs/foo.txt") != 0) { 66 ESP_LOGE(TAG, "Rename failed"); 67 return; 68 } 69 70 // 打开重命名的文件 71 ESP_LOGI(TAG, "Reading file"); 72 f = fopen("/spiffs/foo.txt", "r"); // 以只读方式打开文件 73 if (f == NULL) { 74 ESP_LOGE(TAG, "Failed to open file for reading"); 75 return; 76 } 77 char line[64]; 78 //从指定的流 f 读取一行，并把它存储在 line 所指向的字符串内 79 fgets(line, sizeof(line), f); 80 fclose(f); 81 // 查找换行符 82 char* pos = strchr(line, ' '); 83 if (pos) { 84 *pos = ' '; //放置一个空字符串 85 } 86 ESP_LOGI(TAG, "Read from file: '%s'", line); 87 88 // 卸载分区并禁用SPIFFS 89 esp_vfs_spiffs_unregister(conf.partition_label); 90 ESP_LOGI(TAG, "SPIFFS unmounted"); 91 }
原文：https://gitee.com/EspressifSystems/esp-idf