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overload Preferences.getBytes similar to nvs so you can get size of t… (#2498)

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* overload Preferences.getBytes similar to nvs so you can get size of the array.

* Cleaner implentation, with a separate function to get length.  Added an example
This commit is contained in:
lbernstone
2019-04-09 18:45:38 -06:00
committed by Me No Dev
parent 91508030d8
commit da8b7c1b80
3 changed files with 55 additions and 3 deletions
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14
libraries/Preferences/src/Preferences.cpp
View File

@ -447,9 +447,9 @@ String Preferences::getString(const char* key, const String defaultValue){
return String(buf);
}
size_t Preferences::getBytes(const char* key, void * buf, size_t maxLen){
size_t Preferences::getBytesLength(const char* key){
size_t len = 0;
if(!_started || !key || !buf || !maxLen){
if(!_started || !key){
return 0;
}
esp_err_t err = nvs_get_blob(_handle, key, NULL, &len);
@ -457,11 +457,19 @@ size_t Preferences::getBytes(const char* key, void * buf, size_t maxLen){
log_e("nvs_get_blob len fail: %s %s", key, nvs_error(err));
return 0;
}
return len;
}
size_t Preferences::getBytes(const char* key, void * buf, size_t maxLen){
size_t len = getBytesLength(key);
if(!len || !buf || !maxLen){
return len;
}
if(len > maxLen){
log_e("not enough space in buffer: %u < %u", maxLen, len);
return 0;
}
err = nvs_get_blob(_handle, key, buf, &len);
esp_err_t err = nvs_get_blob(_handle, key, buf, &len);
if(err){
log_e("nvs_get_blob fail: %s %s", key, nvs_error(err));
return 0;

1
libraries/Preferences/src/Preferences.h
View File

@ -63,6 +63,7 @@ class Preferences {
bool getBool(const char* key, bool defaultValue = false);
size_t getString(const char* key, char* value, size_t maxLen);
String getString(const char* key, String defaultValue = String());
size_t getBytesLength(const char* key);
size_t getBytes(const char* key, void * buf, size_t maxLen);
size_t freeEntries();
};