/* * Example of getline from section 27.7.1.3 of the C++ standard * Demonstrates the behavior of getline for various exceptions. * See http://www.cplusplus.com/reference/iostream/istream/getline/ * * Note: This example is meant to demonstrate subtleties the standard and * may not the best way to read a file. */ #include // SD chip select pin const uint8_t chipSelect = SS; // file system object SdFat sd; // create a serial stream ArduinoOutStream cout(Serial); //------------------------------------------------------------------------------ void makeTestFile() { ofstream sdout("GETLINE.TXT"); // use flash for text to save RAM sdout << pstr( "short line\n" "\n" "17 character line\n" "too long for buffer\n" "line with no nl"); sdout.close(); } //------------------------------------------------------------------------------ void testGetline() { const int line_buffer_size = 18; char buffer[line_buffer_size]; ifstream sdin("GETLINE.TXT"); int line_number = 0; while (sdin.getline(buffer, line_buffer_size, '\n') || sdin.gcount()) { int count = sdin.gcount(); if (sdin.fail()) { cout << "Partial long line"; sdin.clear(sdin.rdstate() & ~ios_base::failbit); } else if (sdin.eof()) { cout << "Partial final line"; // sdin.fail() is false } else { count--; // Don’t include newline in count cout << "Line " << ++line_number; } cout << " (" << count << " chars): " << buffer << endl; } } //------------------------------------------------------------------------------ void setup(void) { Serial.begin(9600); while (!Serial) {} // wait for Leonardo // pstr stores strings in flash to save RAM cout << pstr("Type any character to start\n"); while (Serial.read() <= 0) {} delay(400); // catch Due reset problem // initialize the SD card at SPI_HALF_SPEED to avoid bus errors with // breadboards. use SPI_FULL_SPEED for better performance. if (!sd.begin(chipSelect, SPI_HALF_SPEED)) sd.initErrorHalt(); // make the test file makeTestFile(); // run the example testGetline(); cout << "\nDone!\n"; } //------------------------------------------------------------------------------ void loop(void) {}