mirror of
https://github.com/bblanchon/ArduinoJson.git
synced 2025-08-17 11:31:12 +02:00
Updated FAQ (markdown)
23
FAQ.md
23
FAQ.md
@@ -18,16 +18,17 @@ If you're in case 3., you may have a memory leak, it up to you to find it. You c
|
||||
|
||||
This can be due to two causes.
|
||||
|
||||
|
||||
##### Cause 1: reuse of `JsonBuffer`
|
||||
|
||||
First, this can happen if you reuse the same `JsonBuffer`, for example:
|
||||
|
||||
```c++
|
||||
StaticJsonBuffer<200> jsonBuffer;
|
||||
|
||||
for (int i=0; i<10; i++) {
|
||||
char json[256];
|
||||
readJsonFromSomewhere(json, sizeof(json));
|
||||
|
||||
JsonObject& root = jsonBuffer.parse(json);
|
||||
if (root.success()) {
|
||||
Serial.println("parseObject() succeeded");
|
||||
@@ -37,6 +38,26 @@ for (int i=0; i<10; i++) {
|
||||
}
|
||||
```
|
||||
|
||||
The solution is simply to NOT reuse the `JsonBuffer`, like this:
|
||||
|
||||
```c++
|
||||
for (int i=0; i<10; i++) {
|
||||
char json[256];
|
||||
readJsonFromSomewhere(json, sizeof(json));
|
||||
|
||||
StaticJsonBuffer<200> jsonBuffer;
|
||||
|
||||
JsonObject& root = jsonBuffer.parse(json);
|
||||
if (root.success()) {
|
||||
Serial.println("parseObject() succeeded");
|
||||
} else {
|
||||
Serial.println("parseObject() failed!");
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Note that, contrary to a common belief, moving a `StaticJsonBuffer` inside of a loop has no negative impact on performance.
|
||||
|
||||
### What are the differences between `StaticJsonBuffer` and `DynamicJsonBuffer`?
|
||||
|
||||
| `StaticJsonBuffer` | `DynamicJsonBuffer`
|
||||
|
Reference in New Issue
Block a user