The development of REST has made APIs quite accessible while also bringing out their true power and potential. With a resource-oriented architecture, REST APIs are simple to develop and as easily cacheable. Over the years, RESTful APIs have also helped start other important trends, like cloud computing and microservice-based architecture. Because they give companies that use RESTful services an edge over their competitors, it’s no surprise that REST API developers are in high demand right now. Those who want to work in REST API development will find these common interview questions helpful. They will help you get ready for interviews at different companies. Â.
Want to get the perfect Windows development job? This complete guide will give you the information and tips you need to ace your next interview, with a focus on Windows API, MFC, and VC.
Why Windows API?
Windows API the heart of Windows development, empowers you to interact with the operating system’s core functionalities. Mastering this API is crucial for building robust and efficient Windows applications.
Key Concepts:
- DLLs: Dynamic Link Libraries, the building blocks of Windows, extend functionality without code duplication.
- WinMain(): The entry point of a Windows application, responsible for initializing and managing the application’s lifecycle.
- Window Callbacks: Functions that handle events and messages sent by the operating system to the application.
- Message Pump: The core loop that processes messages and events, keeping the application responsive.
- Window Classes: Define the behavior and appearance of windows, providing a foundation for building custom interfaces.
- GDI (Graphics Device Interface): Provides functions for drawing and manipulating graphics on the screen.
- MFC (Microsoft Foundation Classes): A powerful framework that simplifies Windows development by offering pre-built classes and functionality.
- Serialization: The process of converting objects into a format that can be stored or transmitted, enabling data persistence and sharing.
- Threads: Units of execution that allow concurrent tasks within an application, enhancing performance and responsiveness.
Common Interview Questions:
- Differentiate between Windows and DOS, highlighting the advantages of GUI-based programs.
- Explain the purpose and functionality of the Windows SDK and Win32 API.
- Why do Windows programs use APIs instead of directly accessing hardware, unlike DOS?
- Describe the basic components of a Windows DLL and its functionalities.
- Explain the role of the WinMain() function and its differences from the main() function in C/C++.
- What is a Window Callback procedure, and how is it utilized?
- Differentiate between the calling conventions PASCAL, CALLBACK, and WINAPI in C/C++ function calls.
- Walk through the steps involved in writing a basic window program using C and Win32 APIs.
- Explain the purpose of the DefWindowProc() function in the CALLBACK window procedure.
- What are LPARAM and WPARAM, and how does the Win32 subsystem pass parameters to the window procedure?
- Describe the members of the MGS structure and their respective utilities.
- How does the message pump handle messages in a Windows program, and how can you exit the loop?
- List the common window classes available in Windows and explain how to define a custom window class.
- What is the WM_PAINT event, and when does the Win32 subsystem call it?
- When should you use BeginPaint() and EndPaint() versus GetDC() and ReleaseDC()?
- Explain the concept of Device Context (DC) in Windows and its significance.
- Why do Windows programs use APIs to interact with the Device Context instead of directly accessing hardware devices?
- Differentiate between GetDC() and GetWindowDC() calls.
- Define the client and non-client areas of a Windows window.
- Describe the different types of mouse events and how to retrieve the mouse coordinates during these events.
- Explain non-client mouse events and how to determine the object clicked by the mouse.
- Discuss the importance of Unicode and international character/multi-language support in Windows.
- How can you convert a Unicode string to a null-terminated byte string and vice versa?
- What is the purpose of the string table in resources, and how does it contribute to multi-language support?
- In a typical MFC application, why don’t we write the WinMain() function?
- Outline the basic steps involved in developing a typical MFC-based application.
- Identify the base class of any MFC class and explain the MFC class hierarchy starting from CObject.
- Describe the utility of the CWinApp class and its members.
- Can you create multiple objects of your main application class CWinApp?
- Explain the purpose of the CCmdTarget class in the MFC class hierarchy.
- To which class in the MFC class hierarchy does m_pMainWnd belong?
- Provide the class hierarchy tree of the CWinApp class.
- How does MFC utilize event handling, and what is the purpose of the DECLARE_MESSAGE_MAP(), BEGIN_MESSAGE_MAP(), and END_MESSAGE_MAP() macros?
- Why does MFC use virtual functions for a limited number of events?
- Define UNICODE and explain how to provide worldwide language support to your application.
- Mention two major functions for converting ASCII strings to UNICODE strings and vice versa.
- What is the role of the resource DLL in a project?
- Explain the concept of a PEN object in GDI and its different styles.
- What is the utility of the NULL PEN?
- Define BRUSH and its different types. What is the purpose of the NULL BRUSH?
- Differentiate between Screen DC and Printer DC.
- Explain how SaveDC and RestoreDC work.
- What is a RECT, and how can you draw a Bitmap?
- Define a pallet and its different types.
- Explain the concept of a font and its various types.
- What is a MetaFile, and how can you store and retrieve the drawing of a window?
- How can you use GetDeviceCaps(), GetSystemMetrics(), and GetFontMetrics() functions to obtain system settings?
- Explain the concept of a carat and its usage.
- How can you implement keyboard shortcuts in dialogs and menu items?
- Describe how to load a menu and dynamically load menus.
- Explain how to use one event function for a range of menu IDs.
- How can you use a popup menu or a context menu?
- What is a system menu, and how can you append extra menus to it?
- Differentiate between ‘Modal’ and ‘Modeless’ Dialogs, providing examples and their uses.
- Explain how to create a modeless dialog and position it in the center of the Desktop.
- List the different members of the CDataExchange class and explain how data and text are exchanged in the DoDataExchange() routine.
- What are the results of UpdateData(TRUE) and UpdateData(FALSE) calls?
- What are the suitable variable types for data exchange to and from Edit, Check Box, Radio Button, List, and Combobox controls? Can a CString be used for the List Box?
- How is data validated in the data exchange routine?
- How can you customize the text of the message box that appears for data validation?
- Define a property sheet and property page, and explain how they work internally.
- How can you color the background of Edit, Static, and other controls?
- Explain how to set a periodic timer event using SetTimer.
- Describe how to read or modify the Windows clipboard.
- Why are Tree and List controls called view controls?
- What is an Image List?
- List the different types of views supported in ListView.
- What are the different types of common dialogs?
- How can you customize a File Open Dialog?
- Is the FindReplace dialog modal or modeless? Why?
- What are the different open modes in CFile?
- What is the advantage of using the CStudioFile class over CFile?
- How can you open a file on a drag-and-drop operation?
- How can you write a class that supports serialization?
- What is the utility of serialization?
- Is serialization only used for storing or retrieving information to and from the disk filesystem?
- What is the CArchive class in the serialization routine, and why is a CFile not used here?
- Differentiate between worker threads and UI threads.
- How can you create a worker thread using the AfxBeginThread() function?
- How can you create a UI thread using MFC?
- What are the different synchronization classes provided by MFC?
- How can you modify the attributes of a Frame window before its creation?
- Explain the Doc/View architecture in MFC.
- What is the CRuntime class, and where is it used?
- What is an MFC class that supports dynamic creation?
- How can an MFC class support RTTI?
- What is the utility of IMPLEMENT_DYNAMIC?
- Why are Doc/view classes created dynamically?
- How can you construct a Single Document Template class?
- Describe the workflow of a typical MFC Application that supports Doc/View.
- How are messages routed in a Doc/View application?
- What is the purpose of the OnDraw() function in the CView class in Doc/View?
- How are command-line arguments processed in Doc/View?
- Differentiate between SDI and MDI Applications.
- How can you split a CFrameWnd?
- **What is
Why are REST services easily scalable?
REST services are scalable because they don’t store data on the server even when they are asked for, and they don’t need a lot of communication.
3 What is AJAX?
AJAX stands for Asynchronous javascript and XML.
REST API Interview Questions (Beginner Level)
FAQ
How to explain API in interview?
What markup language is used in REST API?
What questions are asked in the Glassdoor API interview?
What questions do API interviewers ask?
They may ask about API testing, REST API, SOAP API and web API. Understanding what questions to expect can help you communicate your understanding of technical concepts and improve your employability. In this article, we list 20 API interview questions and provide example answers to help you prepare for a successful interview.
What is an API interview?
It supplies a quick reference while working within a program. It provides the plan and delivery layout. It also sources the content and details every function within the system.” Review 20 API interview questions and study example answers so you can prepare for an interview for a software engineering position and share your knowledge.
How do I prepare for an API testing interview?
If you have an API testing interview coming up, one of the best ways you can prepare is to review questions that you might be asked during your interview. You can practice answering these questions on your own or consider doing a mock interview with a friend.
What type of data is returned by web API interview questions?
It does not have any specific data type. It can return data of any type depending upon the business requirement. There are many HTTP methods like GET, POST, PUT, etc., which can return data in different formats depending upon the use case. You can download a PDF version of Web Api Interview Questions. Your requested download is ready!
