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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.
// ToggleKeysDoc.cpp : implementation of the CToggleKeysDoc class
//

#include "stdafx.h"
#include "ToggleKeys.h"

#include "ToggleKeysDoc.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CToggleKeysDoc

IMPLEMENT_DYNCREATE(CToggleKeysDoc, CDocument)

BEGIN_MESSAGE_MAP(CToggleKeysDoc, CDocument)
	//{{AFX_MSG_MAP(CToggleKeysDoc)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CToggleKeysDoc construction/destruction

CToggleKeysDoc::CToggleKeysDoc()
{
	// TODO: add one-time construction code here

}

CToggleKeysDoc::~CToggleKeysDoc()
{
}

BOOL CToggleKeysDoc::OnNewDocument()
{
	if (!CDocument::OnNewDocument())
		return FALSE;

	((CEditView*)m_viewList.GetHead())->SetWindowText(NULL);

	// TODO: add reinitialization code here
	// (SDI documents will reuse this document)

	return TRUE;
}



/////////////////////////////////////////////////////////////////////////////
// CToggleKeysDoc serialization

void CToggleKeysDoc::Serialize(CArchive& ar)
{
	// CEditView contains an edit control which handles all serialization
	((CEditView*)m_viewList.GetHead())->SerializeRaw(ar);
}

/////////////////////////////////////////////////////////////////////////////
// CToggleKeysDoc diagnostics

#ifdef _DEBUG
void CToggleKeysDoc::AssertValid() const
{
	CDocument::AssertValid();
}

void CToggleKeysDoc::Dump(CDumpContext& dc) const
{
	CDocument::Dump(dc);
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CToggleKeysDoc commands

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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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