各位朋友新年快樂，這篇文章要介紹如何使用 LinkIt ONE 來取得 Facebook 粉絲頁底層的 JSON 格式，您可以參考我們日前用 App Inventor 做的版本。
LinkIt ONE 的 Wifi / BT 天線是整合在同一支，只要接上板子即可，如下圖。
在程式中有一個叫做 c 的 LWiFiClient 物件，它負責管理網路相關的動作，get 與 post 等等
LWiFiClient c;
接著在 loop() 中，就透過 c.read() 把指定 URL (再次使用 CAVEDU Facebook 專頁的 open graph) 的字元逐一顯示出來。如下圖的最後一行 { “id” = … 開始就是了。有了這些資料之後就可以玩很多東西了。
while (c)
{
int v = c.read();
if (v != -1)
{
Serial.print((char)v);
}… //以下省略
完整的程式碼如下，歡迎您也入手一片 LinkIt ONE 與我們互相討論喔~
LinkIt ONE 取得 Facebook JSON object
/*
Web client
This sketch connects to a website
using Wi-Fi functionality on MediaTek LinkIt platform.
Change the macro WIFI_AP, WIFI_PASSWORD, WIFI_AUTH and SITE_URL accordingly.
created 13 July 2010
by dlf (Metodo2 srl)
modified 31 May 2012
by Tom Igoe
modified 20 Aug 2014
by MediaTek Inc.
*/
#include <LTask.h>
#include <LWiFi.h>
#include <LWiFiClient.h>
#define WIFI_AP "XXX" //your WIFI AP
#define WIFI_PASSWORD "YYY" //WIFI PWD#define WIFI_AUTH LWIFI_WPA // choose from LWIFI_OPEN, LWIFI_WPA, or LWIFI_WEP.
#define SITE_URL "graph.facebook.com" // note that "caveeducation" is part of the HTTP request rather than host name.
LWiFiClient c;
void setup()
{
LTask.begin();
LWiFi.begin();
Serial.begin(115200);
while(!Serial)delay(100);
// keep retrying until connected to AP
Serial.println("Connecting to AP");
while (0 == LWiFi.connect(WIFI_AP, LWiFiLoginInfo(WIFI_AUTH, WIFI_PASSWORD)))
{
delay(1000);
}
// keep retrying until connected to website
Serial.println("Connecting to WebSite");
while (0 == c.connect(SITE_URL, 80))
{
Serial.println("Re-Connecting to WebSite");
delay(1000);
}
// send HTTP request, ends with 2 CR/LF
Serial.println("send HTTP GET request");
c.println("GET /caveeducation HTTP/1.1");
c.println("Host: " SITE_URL);
c.println("Connection: close");
c.println();
// waiting for server response
Serial.println("waiting HTTP response:");
while (!c.available())
{
delay(100);
}
}
boolean disconnectedMsg = false;
void loop()
{
// Make sure we are connected, and dump the response content to Serial
while (c)
{
int v = c.read();
if (v != -1)
{
Serial.print((char)v);
}
else
{
Serial.println("no more content, disconnect");
c.stop();
while (1)
{
delay(1);
}
}
}
if (!disconnectedMsg)
{
Serial.println("disconnected by server");
disconnectedMsg = true;
}
delay(500);
}
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