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Arduino File.find()
Description
The File.find() function reads data from the file until the target is found. The function returns true if target is found, false if timed out (see File.setTimeout()).
The File.find() function inherits from the Stream utility class.
Syntax
file.find(target)
file.find(target, length)
Parameter Values
- file: an instance of a class that inherits from File.
- target: the string to search for. Allowed data types: char.
- length: length of the target. Allowed data types: size_t.
Return Values
- true: if target is found.
- false: if timed out.
Example Code
- Connect the SD Card to your your PC via an USB 3.0 SD Card Reader
Create a arduino.txt file with the below content
myInt=-52
myFloat=-12.70
myString=Arduino
- Connect SD Card to Arduino. See Arduino - Micro SD Card tutorial
- Upload below code to Arduino via Arduino IDE
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/reference/library/arduino-file.find
*/
#include <SD.h>
#define PIN_SPI_CS 4
File file;
void setup() {
Serial.begin(9600);
if (!SD.begin(PIN_SPI_CS)) {
Serial.println(F("SD CARD FAILED, OR NOT PRESENT!"));
while (1); // don't do anything more:
}
file = SD.open("arduino.txt", FILE_READ);
if (file) {
if (file.find("myFloat"))
Serial.println("myFloat is FOUND");
else
Serial.println("myFloat is NOT FOUND");
if (file.find("myDouble"))
Serial.println("myDouble is FOUND");
else
Serial.println("myDouble is NOT FOUND");
file.close();
} else {
Serial.print(F("SD Card: error on opening file"));
}
}
void loop() {
}
- Open Serial Monitor, you will see as below:
COM6
myFloat is FOUND
myDouble is NOT FOUND
Autoscroll
Clear output
9600 baud
Newline
Tutorials
See Also
※ ARDUINO BUY RECOMMENDATION
| Arduino UNO R3 | |
| Arduino Starter Kit |
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