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我正在研究一個小型的Arduino項目，當一個新的追隨者獲得時，它將使LED燈閃爍。顯然，我在這方面受到了部分Twitter規則的限制（來自服務器的請求數量等），但我找到了一種可能使其工作的方法。新推特追隨者閃爍LED
我有一個PHP腳本，用於檢查我擁有的關注者數量。腳本第一次運行時，如果沒有文件存在，它將創建一個文本文件，其中追隨者的數量是該文件的唯一內容。如果我有42個追隨者，那麼這個文件將包含42而沒有別的。在後續運行中，該腳本檢查文件的內容是否與新的跟隨者計數匹配。如果是這樣，它不會對文件執行任何操作並輸出n。如果數字不匹配（意味着我獲得了新的追隨者），那麼我更新文本文件並輸出y。
在Arduino方面，我只是檢查腳本頁面的輸出是否包含y或n，意圖是前者導致我的LED閃爍。
兩個問題我運行到：
通常，當我從腳本文件本身，在n一個響應的情況下閱讀，我越來越喜歡輸出：
1
n
0
這很奇怪，1和0從哪裏來？它們在頁面輸出本身中不可見。我已經儘可能將編碼類型設置爲plain/text。當我從普通的文本文件中讀取時，我只能得到文件的內容（在這種情況下，它將是n）。
我面對的另一個問題是，有時，而不是獲得上述輸出，我得到整個HTTP響應。那就是：
HTTP/1.1 200 OK
Date: Tue, 24 Dec 2013 04:03:32 GMT
Server: Apache
X-Powered-By
你要知道，它停在那裏我的輸出，因爲我有y代碼檢查。這顯然是有缺陷的，但我希望能儘快解決第一個問題。這就是說，爲什麼它有時會給我這樣的整個HTTP響應？
所以問題是：我的代碼有什麼問題導致了這個？如果是這樣，我如何修改它以更好地讀取我喜歡的HTTP響應？
這將是沒有代碼一個無用的問題，所以這裏是（當然沒有互聯網登錄信息...我也掛在這裏 - CODE）：
#include <SPI.h>
#include <WiFi.h>
#include <Twitter.h>
int led = 13;
char ssid[] = ""; // your network SSID (name)
char pass[] = ""; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS; // status of the wifi connection
// initialize the library instance:
WiFiClient client;
const unsigned long requestInterval = 30*1000; // delay between requests; 30 seconds
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(199,59,149,200); // numeric IP for api.twitter.com
char server[] = "raw-d.com"; // name address for twitter API
boolean requested; // whether you've made a request since connecting
unsigned long lastAttemptTime = 0; // last time you connected to the server, in milliseconds
String currentLine = ""; // string to hold the text from server
String tweet = ""; // string to hold the tweet
boolean readingTweet = false; // if you're currently reading the tweet
String lastCount = ""; //last number counted
int numberOfBytes=0;
char* textFound;
void setup()
{
// reserve space for the strings:
currentLine.reserve(256);
tweet.reserve(150);
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while(true);
}
// attempt to connect to Wifi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
// you're connected now, so print out the status: (or not)
//printWifiStatus();
// connectToServer();
}
void loop()
{
//connectToServer();
//delay(10000);
if (client.connected())
{
Serial.println("Connected. Checking for availabiilty of client...");
if (client.available())
{
Serial.println("Client is available! Trying to read from client...");
// read incoming bytes:
if(client.find("\r\n\r\n"))
{
char inChar;
while(inChar=client.read())
{
if(inChar==-1) break;
currentLine+=inChar; //read in all characters of count
Serial.print("\n\nCurrent follower count: " + currentLine + "\n\n");
if(inChar=='y' || inChar == 'n') break;
}
if(inChar=='y')
{
//lastCount=currentLine;
Serial.println("BLINKING LED");
blink(); //blink LED
}
else
{
Serial.println("NOT BLINKING.");
}
currentLine=""; //clear
delay(5000); //delay 5 seconds (don't kill server)
}
else
{
Serial.println("newlines not found - error with request");
}
}
}
else if (millis() - lastAttemptTime > requestInterval)
{
// if you're not connected, and two minutes have passed since
// your last connection, then attempt to connect again:
connectToServer();
}
}
void blink()
{
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(3000); // wait for a second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
//delay(1000); // wait for a second
}
void connectToServer()
{
// attempt to connect, and wait a millisecond:
Serial.println("connecting to server...");
if (client.connect(server, 80))
{
Serial.println("making HTTP request...");
// make HTTP GET request to twitter:
client.println("GET /private/followers.php HTTP/1.1");
client.println("Host:raw-d.com");
client.println("Connection:close");
client.println();
}
else
{
Serial.println("Failure to connect.");
}
// note the time of this connect attempt:
lastAttemptTime = millis();
}
void runPhpScript()
{
// attempt to connect, and wait a millisecond:
Serial.println("connecting to server...");
if (client.connect(server, 80))
{
Serial.println("making HTTP request...");
client.println("GET /private/followers.php HTTP/1.1");
client.println("Host:raw-d.com");
client.println("Connection:close");
client.println();
}
else
{
Serial.println("Failure to run script.");
}
// note the time of this connect attempt:
lastAttemptTime = millis();
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}