Arduino long to string

Arduino long to string

char buf[50];

unsigned long testID = 123;

sprintf(buf, "GET /testID=%lu HTTP/1.0", testID);

Serial.println( buf );

ข้อมูลที่ออกมาคืออ GET /testID=123 HTTP/1.0

http://forum.arduino.cc/index.php?topic=44620.0 Code & Lib https://drive.google.com/folderview?id=0B1a9BpaEVN3wak56LURtVXFwbWs&usp=sharing