nvs::NVSHandle::get_item_size() method

Look up the size of an entry's data.

Syntax

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Summary

Declaration

from nvs_handle.hpp:180

virtual esp_err_t get_item_size(ItemType datatype, const char *key, size_t &size) = 0;

Arguments

Argument

Description

datatype

Data type to search for.

key

Key name. Maximum length is (NVS_KEY_NAME_MAX_SIZE-1) characters. Shouldn't be empty.

size

Size of the item, if it exists. For strings, this size includes the zero terminator.

Return value

- ESP_OK if the item with specified type and key exists. Its size will be returned via \c size. - ESP_ERR_NVS_NOT_FOUND if an item with the requested key and type doesn't exist or any other error occurs.

References

Code

Location

Scope

Referrer

virtual esp_err_t get_item_size(ItemType datatype, const char *key, size_t &size) = 0;

nvs_handle.hpp:180

esp_err_t get_item_size(ItemType datatype, const char *key, size_t &size) override;

nvs_handle_locked.hpp:42

nvs::NVSHandleLocked

nvs::NVSHandleLocked::get_item_size()

esp_err_t get_item_size(ItemType datatype, const char *key, size_t &size) override;

nvs_handle_simple.hpp:52

nvs::NVSHandleSimple

nvs::NVSHandleSimple::get_item_size()

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Override Tree

nvs::NVSHandle::get_item_size() overrides 2 methodss:

nvs::NVSHandleSimple::get_item_size()

nvs::NVSHandleLocked::get_item_size()

nvs::NVSHandle::get_item_size()

Implementations

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Instances

Lifecycle

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