Arduino Convert std:string to String

Question

I'm working on BLE project with espressif library. And It returns me founded BLE device.

std::string getManufacturerData();
std::string getName();
int         getRSSI();
BLEScan*    getScan();

When I want to print device name to serial port

BLEAdvertisedDevice founded_dev;
founded_dev=foundDevices.getDevice(0);
Serial.println("Name -> " + founded_dev.getName());

It gives me error like this

no matching function for call to 'HardwareSerial::println(std::__cxx11::basic_string<char>)'

So how can i convert to std:string to String in Arduino?

Majenko · Accepted Answer · 2018-09-25T08:54:51.053

11

Don't. Instead just access the underlying C string:

Serial.print(F("Name -> "));
Serial.println(founded_dev.getName().c_str());

edited Sep 25 '18 at 08:54

answered Sep 25 '18 at 08:22

Majenko

That works for getName() but not some of the other methods such as `BLEAdvertisedDevice::getAddress()` or `BLEAdvertisedDevice::getServiceUUID()` – Tom Auger Jan 31 '20 at 02:04
@TomAuger That's because they don't return a string. The first returns a BLEAddress, the second a BLEUUID. Custom types that will need special handling. – Majenko Jan 31 '20 at 09:53
2

For the UUID you can use `getServiceUUID().toString().c_str()`, For the address you can use: `getAddress().toString().c_str()`. – Majenko Jan 31 '20 at 09:54

1 Answers1