A user complained that Outlook was blocking access to a Word document attachment he sent to a Task using Word's Create Outlook Task command.
When trying to attach a PDF as object on WORD 2013 64bit I am gettiing following error: 'The program used to create this object is AcroExch. That program is either not installed on your computer or it is not responding. Embed an object into a project. To change the default icon image or label of an object displayed as an icon, click Change Icon. To change the icon, click the icon in the list of icons associated with the program. To use the icon that is displayed by default with the program that is associated with the icon.
I'm receiving this message in Outlook when opening a task created by Microsoft Word:
'Outlook blocked access to the following potentially unsafe attachments'
I tried the Level1Remove registry fix but this did not work. I disabled Protected View (in Trust Settings) within Word. Still no go. Why is Outlook blocking attachments from its own software (Word)?
This security issue affects Outlook 2007 and up. The file is blocked because it's not a doc file, it's a *shortcut* to the doc file and shortcuts are potentially 'dangerous'.
You need to configure the security settings to not block the file. In Outlook 2007 and Outlook 2010 you can use the following registry keys to change the Security settings. You'll need to restart Outlook for the keys to take effect.
Enabling ShowLevel1Attach will allow users to open or save potentially dangerous attachments. While an updated antivirus will catch older exploits if users try to save or open the attachment, it could miss new exploits not yet in it's virus definition file.
When you double click on an embedded object, a warning message may be triggered:
Some objects contain viruses that can be harmful to your computer. It is important to be certain that this object is from a trustworthy source.
Do you trust this embedded object?
Do you trust this embedded object?
This dialog is controlled by the AllowInPlaceOLEActivation registry value. Enabling it will allow the embedded object to open without triggering the warning message.
Outlook 2016
Outlook 2013
Outlook 2010
Outlook 2007
Do It For Me
I have a reg file to unblock all attachments and OLE objects (containing the values above). Download and run the .reg file for your version of Outlook.
Network users may be blocked by group policy, so this should only be used by SOHO users - everyone else should speak to their admin.
ShowLevel1Attach 2016ShowLevel1Attach 2013
ShowLevel1Attach 2010ShowLevel1Attach 2007
ShowLevel1Attach 2010ShowLevel1Attach 2007
You'll need to restart Outlook for the key to take effect.
More Information
Information for administrators about e-mail security settings in Outlook 2007
You cannot open linked file attachments in Outlook: 'Outlook blocked access to the following potentially unsafe attachments'
You cannot open linked file attachments in Outlook: 'Outlook blocked access to the following potentially unsafe attachments'
Java is an Object-Oriented Language. As a language that has the Object-Oriented feature, Java supports the following fundamental concepts −
- Polymorphism
- Inheritance
- Encapsulation
- Abstraction
- Classes
- Objects
- Instance
- Method
- Message Passing
In this chapter, we will look into the concepts - Classes and Objects.
- Object − Objects have states and behaviors. Example: A dog has states - color, name, breed as well as behaviors – wagging the tail, barking, eating. An object is an instance of a class.
- Class − A class can be defined as a template/blueprint that describes the behavior/state that the object of its type support.
Objects in Java
Let us now look deep into what are objects. If we consider the real-world, we can find many objects around us, cars, dogs, humans, etc. All these objects have a state and a behavior.
If we consider a dog, then its state is - name, breed, color, and the behavior is - barking, wagging the tail, running.
If you compare the software object with a real-world object, they have very similar characteristics.
Software objects also have a state and a behavior. A software object's state is stored in fields and behavior is shown via methods.
So in software development, methods operate on the internal state of an object and the object-to-object communication is done via methods.
Classes in Java
A class is a blueprint from which individual objects are created.
Following is a sample of a class.
Example
A class can contain any of the following variable types.
- Local variables − Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed.
- Instance variables − Instance variables are variables within a class but outside any method. These variables are initialized when the class is instantiated. Instance variables can be accessed from inside any method, constructor or blocks of that particular class.
- Class variables − Class variables are variables declared within a class, outside any method, with the static keyword.
A class can have any number of methods to access the value of various kinds of methods. In the above example, barking(), hungry() and sleeping() are methods.
Following are some of the important topics that need to be discussed when looking into classes of the Java Language.
Constructors
When discussing about classes, one of the most important sub topic would be constructors. Every class has a constructor. If we do not explicitly write a constructor for a class, the Java compiler builds a default constructor for that class.
Each time a new object is created, at least one constructor will be invoked. The main rule of constructors is that they should have the same name as the class. A class can have more than one constructor.
Following is an example of a constructor −
Example
Java also supports Singleton Classes where you would be able to create only one instance of a class.
Note − We have two different types of constructors. We are going to discuss constructors in detail in the subsequent chapters.
Creating an Object
As mentioned previously, a class provides the blueprints for objects. So basically, an object is created from a class. In Java, the new keyword is used to create new objects.
There are three steps when creating an object from a class −
- Declaration − A variable declaration with a variable name with an object type.
- Instantiation − The 'new' keyword is used to create the object.
- Initialization − The 'new' keyword is followed by a call to a constructor. This call initializes the new object.
Following is an example of creating an object −
Example
Live DemoIf we compile and run the above program, then it will produce the following result −
Output
Accessing Instance Variables and Methods
Instance variables and methods are accessed via created objects. To access an instance variable, following is the fully qualified path −
Example
This example explains how to access instance variables and methods of a class.
Live DemoIf we compile and run the above program, then it will produce the following result −
Output
Source File Declaration Rules
As the last part of this section, let's now look into the source file declaration rules. These rules are essential when declaring classes, import statements and package statements in a source file.
- There can be only one public class per source file.
- A source file can have multiple non-public classes.
- The public class name should be the name of the source file as well which should be appended by .java at the end. For example: the class name is public class Employee{} then the source file should be as Employee.java.
- If the class is defined inside a package, then the package statement should be the first statement in the source file.
- If import statements are present, then they must be written between the package statement and the class declaration. If there are no package statements, then the import statement should be the first line in the source file.
- Import and package statements will imply to all the classes present in the source file. It is not possible to declare different import and/or package statements to different classes in the source file.
Classes have several access levels and there are different types of classes; abstract classes, final classes, etc. We will be explaining about all these in the access modifiers chapter.
Apart from the above mentioned types of classes, Java also has some special classes called Inner classes and Anonymous classes.
Java Package
In simple words, it is a way of categorizing the classes and interfaces. When developing applications in Java, hundreds of classes and interfaces will be written, therefore categorizing these classes is a must as well as makes life much easier.
Import Statements
In Java if a fully qualified name, which includes the package and the class name is given, then the compiler can easily locate the source code or classes. Import statement is a way of giving the proper location for the compiler to find that particular class.
For example, the following line would ask the compiler to load all the classes available in directory java_installation/java/io −
A Simple Case Study
For our case study, we will be creating two classes. They are Employee and EmployeeTest.
First open notepad and add the following code. Remember this is the Employee class and the class is a public class. Now, save this source file with the name Employee.java.
The Employee class has four instance variables - name, age, designation and salary. The class has one explicitly defined constructor, which takes a parameter.
Example
As mentioned previously in this tutorial, processing starts from the main method. Therefore, in order for us to run this Employee class there should be a main method and objects should be created. We will be creating a separate class for these tasks.
Following is the EmployeeTest class, which creates two instances of the class Employee and invokes the methods for each object to assign values for each variable.
Save the following code in EmployeeTest.java file.
Now, compile both the classes and then run EmployeeTest to see the result as follows −
Output
What is Next?
In the next session, we will discuss the basic data types in Java and how they can be used when developing Java applications.