[備忘錄] MFC 取得各類Pointer & Handle 的方法－一個小小工程師的心情抒發天地

為了讓自己查找方便，所以撰寫了這篇文章，本文融會了許多前人所整理的資料，加上自己的一些想法，如有錯誤，請 Mail 或留言通知。

MFC取得常用的handle<view , document , fram , app >

Get APP

AfxGetInstanceHandle ()

AfxGetApp ()

Get Frame->View->Document

SDI AfxGetMainWnd()->GetActiveView()->GetDocument()

MDI AfxGetMainWnd()->MDIGetActive()->GetActiveView()->GetDocument()

Get Menu

CMenu * pMenu = AfxGetApp()->m_pMainWnd->GetMunu () ;

Get Tool Bar , Status Bar

(CMainFram *) GetParent()->m_wndToolBar ;

(CMainFram *) GetParent()->m_wndStatusBar ;

CStatusBar * pStatusBa = (CStatusBar* )AfxGetMainWnd()->GetDescendantWindow ( AFX_IDW_STATUS_BAR );

CToolBar * pToolBar = ( CToolBar * ) AfxGetMainWnd()->GetDescendantWindow (AFX_IDW_TOOLBAR ) ;

Get View from Document

Function ( GetFirstViewPosition ) & ( GetNextView ) can get pointer ;

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MFC中取得Windows Handle的方法

GetTopWindow

Syntax

HWND WINAPI GetTopWindow(
  _In_opt_ HWND hWnd
);

Parameters

hWnd [in, optional]

Type: HWND

A handle to the parent window whose child windows are to be examined. If this parameter is NULL, the function returns a handle to the window at the top of the Z order.

Return value

Type:

Type: HWND

If the function succeeds, the return value is a handle to the child window at the top of the Z order. If the specified window has no child windows, the return value is NULL. To get extended error information, use the GetLastError function.

Source : https://msdn.microsoft.com/zh-tw/library/windows/desktop/ms633514(v=vs.85).aspx

GetActiveWindow

功能: 簡單來說就是取得當前Window 的handle ! ( 這個很好用 )

Syntax

HWND WINAPI GetActiveWindow(void);

Parameters

This function has no parameters.

Return value

Type: HWND

The return value is the handle to the active window attached to the calling thread's message queue. Otherwise, the return value is NULL.

Remarks

To get the handle to the foreground window, you can use GetForegroundWindow.

To get the window handle to the active window in the message queue for another thread, use GetGUIThreadInfo.

GetForegroundWindow

功能 : This function will return foreground handle .

GetSafeHwnd

功能 : 這個函數其實就是像直接存取 h_wnd一樣，不過通常我都會使用這個比較安全。

HWND ThisWindowsHandle = GetSafeHwnd() ;

DBG("\n####### ThisWindowsHandle : 0x%p ####### \n" , ThisWindowsHandle ) ; //Print

FindWindow

Retrieves a handle to the top-level window whose class name and window name match the specified strings. This function does not search child windows. This function does not perform a case-sensitive search.

To search child windows, beginning with a specified child window, use the FindWindowEx function.

Syntax

HWND WINAPI FindWindow(
  _In_opt_ LPCTSTR lpClassName,
  _In_opt_ LPCTSTR lpWindowName
);

Parameters

lpClassName [in, optional]

Type: LPCTSTR

The class name or a class atom created by a previous call to the RegisterClass or RegisterClassEx function. The atom must be in the low-order word of lpClassName; the high-order word must be zero.

If lpClassName points to a string, it specifies the window class name. The class name can be any name registered with RegisterClass or RegisterClassEx, or any of the predefined control-class names.

If lpClassName is NULL, it finds any window whose title matches the lpWindowName parameter.

lpWindowName [in, optional]

Type: LPCTSTR

The window name (the window's title). If this parameter is NULL, all window names match.

Return value

Type:

Type: HWND

If the function succeeds, the return value is a handle to the window that has the specified class name and window name.

If the function fails, the return value is NULL. To get extended error information, call GetLastError.

Remarks

If the lpWindowName parameter is not NULL, FindWindow calls the GetWindowText function to retrieve the window name for comparison. For a description of a potential problem that can arise, see the Remarks for GetWindowText.