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copied!<pre><code>#include <SD.h> float meterTemp[6]; String theLines; File myFile; String filename="Test.cal"; int line=0; void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect. Needed for Leonardo only } Serial.print("Initializing SD card..."); // On the Ethernet Shield, CS is pin 4. It's set as an output by default. // Note that even if it's not used as the CS pin, the hardware SS pin // (10 on most Arduino boards, 53 on the Mega) must be left as an output // or the SD library functions will not work. pinMode(53, OUTPUT); if (!SD.begin(4)) { Serial.println("initialization failed!"); return; } Serial.println("initialization done."); // re-open the file for reading: myFile = SD.open("Test.cal"); if (myFile) { Serial.println("test.txt:"); ; // read from the file until there's nothing else in it: while (myFile.available()) { Serial.write(myFile.read()); theLines=readFile(filename,line); Serial.println(theLines); } // close the file: myFile.close(); } else { // if the file didn't open, print an error: Serial.println("error opening test.txt"); } } void loop() { // nothing happens after setup } String readFile(String filename, int line) { char s[20]; char FileName[sizeof(filename)]; filename.toCharArray(FileName, sizeof(FileName)); File myFile = SD.open(FileName,FILE_READ); if(myFile) { String recived = ""; int cur = 0; char ch; while (myFile.available()) { ch = myFile.read(); if(ch == ',') { cur++; if(cur == line) { myFile.close(); return String(recived); } } else { recived += ch; } } } return ""; } </code></pre>

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