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@cmaglie
Last active February 18, 2023 14:27
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StringStream class for Arduino
#ifndef _STRING_STREAM_H_INCLUDED_
#define _STRING_STREAM_H_INCLUDED_
#include <Stream.h>
class StringStream : public Stream
{
public:
StringStream(const String &s) : string(s), position(0) { }
// Stream methods
virtual int available() { return string.length() - position; }
virtual int read() { return position < string.length() ? string[position++] : -1; }
virtual int peek() { return position < string.length() ? string[position] : -1; }
virtual void flush() { };
// Print methods
virtual size_t write(uint8_t c) { string += (char)c; };
private:
String &string;
int length;
int position;
};
#endif // _STRING_STREAM_H_INCLUDED_
@sanfx
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sanfx commented Jan 27, 2017

would it be possible to achieve some thing like this:

StringStream sqlQuery;
    sqlQuery  << "INSERT INTO arduinoSensorData.sensorLog (out_temperature,  " 
        << "out_humidity,  drwngRoom_temperature, drwngRoom_humidity, "
        << "pot1_soilMoisture, pot1_avg_SoilMoisture, wateringPot1) VALUES ('" 
        << outdoorTempInC << "', '" << outoorHumidity << "', '" << indorTempinC
        << "', '" << humidity << "', '" << val << "', '" << avgVal << "', '"
        << statusMsg << "');";

tried it gives an error,

error: no matching function for call to 'StringStream::StringStream()'
     StringStream sqlQuery;

how do I achieve the above ?

@arnavb
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arnavb commented Feb 18, 2018

@sanfx, this is really late, but you would have to implement a operator<< for the class.

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