What is CreateWindow?
The CreateWindow function creates an overlapped, pop-up, or child window. It specifies the window class, window title, window style, and (optionally) the initial position and size of the window. The function also specifies the window’s parent or owner, if any, and the window’s menu.
What is the difference between CreateWindow and CreateWindowEx?
CreateWindow is older. You should use CreateWindowEx but it doesn’t really matter. The main difference is you can’t set a window’s “extended style” with CreateWindow.
What is the second parameter of Create window?
The second parameter is the window title, of type std::string.
How do I make messages only in Windows?
To create a message-only window, specify the HWND_MESSAGE constant or a handle to an existing message-only window in the hWndParent parameter of the CreateWindowEx function.
What is TranslateMessage?
TranslateMessage() converts virtual keys messages to character input messages. It is a separate call for the remote chance that under certain circumstances you would want to not produce character input messages for certain virtual keys. Highly active question.
What is hInstance C++?
hInstance is something called a “handle to an instance” or “handle to a module.” The operating system uses this value to identify the executable (EXE) when it is loaded in memory. The instance handle is needed for certain Windows functions—for example, to load icons or bitmaps.
What is Wndclass?
The WNDCLASS structure holds most of the information defining a window class. This information is used by any windows which belong to the class. The only item which this structure does not hold is a handle to the class’s small icon. (The more advanced WNDCLASSEX structure does.)
What is Ws_overlappedwindow?
Creating a Main Window Most applications typically use the WS_OVERLAPPEDWINDOW style to create the main window. This style gives the window a title bar, a window menu, a sizing border, and minimize and maximize buttons. The CreateWindowEx function returns a handle that uniquely identifies the window.
What is message only window?
The point of a message-only window is that it receives only messages sent or posted specifically to it. You use it to set up a private channel between the sender and the window.
What is message loop in windows programming?
The message loop is an obligatory section of code in every program that uses a graphical user interface under Microsoft Windows. Windows programs that have a GUI are event-driven. Windows maintains an individual message queue for each thread that has created a window. Usually only the first thread creates windows.
What is the difference between GetMessage and DispatchMessage function?
GetMessage pulls the WM_LBUTTONDOWN message from the queue and fills in the MSG structure. Your program calls the TranslateMessage and DispatchMessage functions. Inside DispatchMessage, the operating system calls your window procedure. Your window procedure can either respond to the message or ignore it.
What happens when any keyboard key is pressed about Wm_char message?
The thing with WM_CHAR is that it gives you character codes for textual characters: so if someone presses the 9 key, you’ll get ‘9’. If someone presses SHIFT+9, Windows will take the shift state into account – and you get ‘(‘ (if using US keyboard).