Members
The CWindowImpl consists of Public Methods, CWindowImplBaseT Methods, and Static Methods. Let's get into the details of them.
Public Methods
The CWindowImpl consists of a create method.
CWindowImpl::Create
The Create method is used to create a window.
Syntax:
HWND Create(
HWND hWndParent,
_U_RECT rect = NULL,
LPCTSTR szWindowName = NULL,
DWORD dwStyle = 0,
DWORD dwExStyle = 0,
_U_MENUorID MenuOrID = 0U,
LPVOID lpCreateParam = NULL);
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Parameters:
-
hWndParent: It handles the parent window.
-
rect: It is the RECT structure that specifies the window's position.
-
szWindowName: This parameter specifies the window name.
-
dwStyle: It specifies the style of the window.
-
dwExStyle: This value is combined with the style for the window the traits class provides.
-
MenuOrID: this parameter is the window identifier. Child Window uses it.
- lpCreateParam: It is a pointer to window-creation data.
CWindowImplBaseT Methods
The following are the CWindowImplBaseT Methods:
-
DefWindowProc
-
GetCurrentMessage
-
GetWindowProc
-
OnFinalMessage
-
SubclassWindow
-
UnsubclassWindow
Let's get details of each of them.
DefWindowProc
This method is used to process the messages.
Syntax:
LRESULT DefWindowProc(
UINT uMsg,
WPARAM wParam,
LPARAM lParam);
LRESULT DefWindowProc();
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Parameters
-
uMsg: It contains the window message.
-
wParam: It is the additional message information.
-
lParam: It is the additional message information.
GetCurrentMessage
This method returns the current message.
Syntax:
const MSG* GetCurrentMessage();
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GetWindowProc
This method returns the current window procedure.
Syntax:
virtual WNDPROC GetWindowProc();
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OnFinalMessage
This method is called after the last message is received. You can override the WindowProc Class to use different mechanisms for handling messages rather than the default one.
Syntax:
virtual void OnFinalMessage(HWND hWnd);
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Parameter:
- hWnd: This parameter handles the window being destroyed.
SubclassWindow
This method subclasses a window. It attaches the window to the CWindowImpl object. It returns TRUE if the window is subclassed, else it returns FALSE.
Syntax:
BOOL SubclassWindow(HWND hWnd);
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Parameter:
- hWnd: This parameter handles the window being subclassed.
UnsubclassWindow
This method restores the previously subclassed window.
Syntax:
HWND UnsubclassWindow();
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Static Methods
The CWindowImpl class consists of two static methods. The GetWndClassInfo and the WindowProc method.
Let's get into the details of them.
GetWndClassInfo
This method manages the window class information. It returns a static instance of CWndClassInfo Class.
Syntax:
static CWndClassInfo& GetWndClassInfo();
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WindowProc
The WindowProc implements the window procedure.
Syntax:
static LRESULT CALLBACK WindowProc(
HWND hWnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam);
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Parameters
-
hWnd: It handles the current window.
-
uMsg: It contains the window message.
-
wParam: It is the additional message information.
- lParam: It is the additional message information
Frequently Asked Questions
What are Public methods?
The public methods are accessible inside and outside the scope of the class.
What are static methods?
The static methods are used without creating an instance of the class.
Name some static methods of the CWindowImpl class.
The GetWndClassInfo and the WindowProc method are the static methods of the CWindowImpl class.
Conclusion
In this article, we have discussed the details of CWindowImpl Windows Support Class and its methods. We hope the blog has helped you enhance your knowledge of CWindowImpl Windows Support Class. You can refer to our guided paths on the Coding Ninjas Studio platform to learn more about DSA, DBMS, Competitive Programming, Python, Java, JavaScript, etc. To practice and improve yourself in the interview, you can also check out Top 100 SQL problems, Interview experience, Coding interview questions, and the Ultimate guide path for interviews. Do upvote our blogs to help other ninjas grow.
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