ESP8266 Community Forum

- Wed Jan 06, 2016 12:21 pm #38060 Thx - I sure wasn't thinking about ram/flash....

I saw the following example , but reserve does not display red, however code compile.

String inputString = "";
inputString.reserve(1024); // reserve buffer

is reserve() valid on ESP?

- Wed Jan 06, 2016 1:04 pm #38064 What do you mean by "not display red" ?
Yes, reserve() exist in cores/esp8266/WString.cpp, but be aware that the string pointer itself in the stack when local, but the buffer itself is in the heap since it is been created with malloc().

- Wed Jan 06, 2016 1:29 pm #38067 The string .xxxx statements appear red/orange which I assume means they're are valid..
it apparently did not compile correctly .. did nothing but dump.....

Can you define a maximum string length so that free memory won't be changing when your string is less than maximum ,, 1 of my string vars will be 0 - 1023 bytes

- Wed Jan 06, 2016 1:48 pm #38070 Honestly, I never understood Arduino IDE highlighting, because some function like memset() becomes in red, while some other such as snprintf() won't. Their algorithm is probably funky, so, I don't bother.

For the allocation, yes, that why the reserve() exist, predefining it prevent tons of realloc/copy while doing multiple concatenates, for example.