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Arduino File.rewindDirectory()
Description
The File.rewindDirectory() function takes you back to the first file in the directory, used in conjunction with openNextFile().
Syntax
file.rewindDirectory()
Parameters
- file: an instance of the File class.
Returns
- None
Example Code
#include <SD.h>
#define PIN_SPI_CS 4
File root;
void setup() {
Serial.begin(9600);
if (!SD.begin(PIN_SPI_CS)) {
Serial.println("SD CARD FAILED, OR NOT PRESENT!");
while (1); // don't do anything more:
}
root = SD.open("/");
printDirectory(root, 0);
Serial.println("Done!");
}
void loop() {
// Nothing happens after setup finishes
}
void printDirectory(File dir, int numTabs) {
while (true) {
File entry = dir.openNextFile();
if (! entry) {
// No more files
// Return to the first file in the directory
dir.rewindDirectory();
break;
}
for (uint8_t i = 0; i < numTabs; i++) {
Serial.print('\t');
}
Serial.print(entry.name());
if (entry.isDirectory()) {
Serial.println("/");
printDirectory(entry, numTabs + 1);
} else {
// Files have sizes, directories do not
Serial.print("\t\t");
Serial.println(entry.size(), DEC);
}
}
}
Tutorials
See Also
※ ARDUINO BUY RECOMMENDATION
| Arduino UNO R3 | |
| Arduino Starter Kit |
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