exit status 1 expected primary-expression before '.' token - c++

Question

I'm trying to get the temperature and humidity every 60 seconds, but my code won't work. Whenever I compile it, there's this error "expected primary-expression before '.' token"
This line gets highlighted.
Serial.print(DHT.humidity,0);//prints humidity in serial
Here's my entire code:
#include <DHT_U.h>
#define DHT12PIN 7// sets pin 7 for DHT11 signal connection
void setup(){
Serial.begin(9600);//opens serial
}
void loop()
{
int chk = DHT.read12(DHT12PIN);//reads DHT12
Serial.print(DHT.temperature,0);//prints temp in serial
Serial.print(",");//pints comma in serial
Serial.print(DHT.humidity,0);//prints humidity in serial
Serial.println(); //carraiage return
delay(2000);//wait 2 seconsds
}

Answer 1

Wow there was a lot to unpack in this question.
I have used the DHT library by Adafruit a lot of times and thought that you just ended up using the class name instead of instantiating a variable and that's why you were facing the issue.
But then I realized that you are using the following function which is not a part of the Adafruit library:
int chk = dht.read12(DHT12PIN);//reads DHT12
So, I did a bit of digging on the internet and realized that someone has made a library for DHT with that specific function. (A lot of libraries to be specific)
Based on my analysis of this library, and the example code that was given, you have 3 issues.
You have included the wrong header file. The header file dht.h from RobTillaart's library should replace the header file DHT_U.h of Adafruit's library, in your code.
You have to instantiate the variable named DHT of the dht class. This can be done as follows, above your setup function
dht DHT;
Given that you had the code and the header files mixed up from TWO DIFFERENT LIBRARIES, I am guessing that you have installed the Adafruit library, in the place of RobTillaart's library. To fix this, you will have to remove the DHT-sensor-library-1.3.4 from your Documents/Arduino/libraries, create a new folder named DHTStable in it's place, and place all of the files listed here in the new folder.
Some words of experience-based wisdom, don't use RobTillaart's library, I can tell from a glance of it's folder structure that you will face more problems then you can solve if you use it. Instead use Adafruit's library, with their example. You will also have to install Adafruit's sensor library, but it is definitely worth it.