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Toggling the Num Lock, Caps Lock, and Scroll Lock keys

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24 May 2002CPOL3 min read 252.3K   7K   65  
How to toggle the Num Lock, Caps Lock, and Scroll Lock keys programmatically
There are two more functions that can toggle keyboard state but each of them has some specific limitations like SendInput does. In this article, you will find all possible variants with their descriptions and limitations and a simple solution for toggling these keys avoiding compatibility problems.
// ToggleKeysView.h : interface of the CToggleKeysView class
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_TOGGLEKEYSVIEW_H__5025B7E9_599B_444E_93FA_E30AAD82F89A__INCLUDED_)
#define AFX_TOGGLEKEYSVIEW_H__5025B7E9_599B_444E_93FA_E30AAD82F89A__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000


class CToggleKeysView : public CEditView
{
protected: // create from serialization only
	CToggleKeysView();
	DECLARE_DYNCREATE(CToggleKeysView)

// Attributes
public:
	CToggleKeysDoc* GetDocument();

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CToggleKeysView)
	public:
	virtual void OnDraw(CDC* pDC);  // overridden to draw this view
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
	protected:
	virtual BOOL OnPreparePrinting(CPrintInfo* pInfo);
	virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);
	virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);
	//}}AFX_VIRTUAL

// Implementation
public:
	virtual ~CToggleKeysView();
#ifdef _DEBUG
	virtual void AssertValid() const;
	virtual void Dump(CDumpContext& dc) const;
#endif

protected:

// Generated message map functions
protected:
	//{{AFX_MSG(CToggleKeysView)
		// NOTE - the ClassWizard will add and remove member functions here.
		//    DO NOT EDIT what you see in these blocks of generated code !
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

#ifndef _DEBUG  // debug version in ToggleKeysView.cpp
inline CToggleKeysDoc* CToggleKeysView::GetDocument()
   { return (CToggleKeysDoc*)m_pDocument; }
#endif

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_TOGGLEKEYSVIEW_H__5025B7E9_599B_444E_93FA_E30AAD82F89A__INCLUDED_)

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Software Developer (Senior) SafeNet Inc
United States United States
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