You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.2 KiB
83 lines
2.2 KiB
5 years ago
|
/*
|
||
|
|
* 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 "SdFs.h"
|
||
|
|
|
||
|
|
// 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 << F(
|
||
|
|
"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);
|
||
|
|
|
||
|
|
// Wait for USB Serial
|
||
|
|
while (!Serial) {
|
||
|
|
SysCall::yield();
|
||
|
|
}
|
||
|
|
|
||
|
|
// F stores strings in flash to save RAM
|
||
|
|
cout << F("Type any character to start\n");
|
||
|
|
while (!Serial.available()) {
|
||
|
|
SysCall::yield();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Initialize at the highest speed supported by the board that is
|
||
|
|
// not over 50 MHz. Try a lower speed if SPI errors occur.
|
||
|
|
if (!sd.begin(chipSelect, SD_SCK_MHZ(50))) {
|
||
|
|
sd.initErrorHalt(&Serial);
|
||
|
|
}
|
||
|
|
|
||
|
|
// make the test file
|
||
|
|
makeTestFile();
|
||
|
|
|
||
|
|
// run the example
|
||
|
|
testGetline();
|
||
|
|
cout << "\nDone!\n";
|
||
|
|
}
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
void loop(void) {}
|