Click here to Skip to main content
Click here to Skip to main content

Registry Class

, 17 Nov 1999
Rate this:
Please Sign up or sign in to vote.
A simple registry class
<!-- Article Starts -->

OK, there are many registry classes out there, but this is the one I wrote. I have used it for years in many commercial applications, so it is quite well tested in terms of reading and writing values. The only weakness of the class is that it does not have extensive support for deleting or copying keys.

There are a few useful features in the class worth noting:

  • When reading a value, you can provide a default value in case the operation fails.
  • You can read and write objects such as CFonts, CPoints, etc. from/to the registry.

How to Use the Class

  1. Declare a CRegistry object local to your function.
  2. Call CRegistry::SetRootKey(HKEY hRootKey) to set the root key.
  3. Call CRegistry::SetKey(CString strKey, BOOL bCanCreate). Pass bCanCreate=TRUE to write to the registry. Pass bCanCreate=FALSE to read from the registry.

Here is an example...

void CMyApp::ReadRegistry()
{
	CRegistry Reg();
	Reg.SetRootKey(HKEY_LOCAL_MACHINE);
	if (Reg.SetKey("Software\\MyApp\\Settings", FALSE))
	{
		m_nData = Reg.ReadInt("Data1", 0);
		pi = Reg.ReadFloat("Pi", 3.14159);
		m_strUserName = Reg.ReadString("UserName", "Default User Name");
		Reg.ReadFont(&m_font);
	}
	else
	{
		TRACE("Failed to open key\n");
	}

}

It's just that simple!

I have included the class interface below to illustrate the variety of member functions.

#ifndef __REGISTRY_H__
#define __REGISTRY_H__

class CRegistry
{
public:
	CRegistry();
	~CRegistry();

int m_nLastError;

// CRegistry properties	
protected:
	HKEY m_hRootKey;
	BOOL m_bLazyWrite;
	CString m_strCurrentPath;

public:
	inline BOOL PathIsValid() {
		return (m_strCurrentPath.GetLength() > 0); }
	inline CString GetCurrentPath() {
		return m_strCurrentPath; }
	inline HKEY GetRootKey() {
		return m_hRootKey; }


//CRegistry	methods
public:
	BOOL ClearKey();
	BOOL SetRootKey(HKEY hRootKey);
	BOOL CreateKey(CString strKey);
	BOOL DeleteKey(CString strKey);
	BOOL DeleteValue(CString strName);
	int GetDataSize(CString strValueName);
	DWORD GetDataType(CString strValueName);
	int GetSubKeyCount();
	int GetValueCount();
	BOOL KeyExists(CString strKey, HKEY hRootKey = NULL);
	BOOL SetKey(CString strKey, BOOL bCanCreate);
	BOOL ValueExists(CString strName);
	void RenameValue(CString strOldName, CString strNewName);

	// data reading functions
	COleDateTime ReadDateTime(CString strName, COleDateTime dtDefault);
	double ReadFloat(CString strName, double fDefault);
	CString ReadString(CString strName, CString strDefault);
	int ReadInt(CString strName, int nDefault);
	BOOL ReadBool(CString strName, BOOL bDefault);
	COLORREF ReadColor(CString strName, COLORREF rgbDefault);
	BOOL ReadFont(CString strName, CFont* pFont);
	BOOL ReadPoint(CString strName, CPoint* pPoint);
	BOOL ReadSize(CString strName, CSize* pSize);
	BOOL ReadRect(CString strName, CRect* pRect);
	DWORD ReadDword(CString strName, DWORD dwDefault);

	// data writing functions
	BOOL WriteBool(CString strName, BOOL bValue);
	BOOL WriteDateTime(CString strName, COleDateTime dtValue);
	BOOL WriteString(CString strName, CString strValue);
	BOOL WriteFloat(CString strName, double fValue);
	BOOL WriteInt(CString strName, int nValue);
	BOOL WriteColor(CString strName, COLORREF rgbValue);
	BOOL WriteFont(CString strName, CFont* pFont);
	BOOL WritePoint(CString strName, CPoint* pPoint);
	BOOL WriteSize(CString strName, CSize* pSize);
	BOOL WriteRect(CString strName, CRect* pRect);
	BOOL WriteDword(CString strName, DWORD dwValue);

};// end of CRegistry class definition


#endif

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

Robert Pittenger, MCPD-EAD
President Starpoint Software Inc.
United States United States
Bob Pittenger is founder and President of Starpoint Software Inc. He holds a B.A. degree from Miami University, M.S. and Ph.D. degrees from Purdue University, and an MBA from Xavier University. He has been programming since 1993, starting with Windows application development in C++/MFC and moving to C# and .NET around 2005 and is a .NET Microsoft Certified Professional Developer.
 
Bob is the author of two books:
Billionaire: How the Ultra-Rich Built Their Fortunes Through Good and Evil and What You Can Learn from Them
and
Wealthonomics: The Most Important Economic and Financial Concepts that Can Make You Rich Fast.
Visit http://www.billionairebook.net for more information.

Comments and Discussions

 
QuestionWriteString Unicode Pinmemberdimag18-Jun-14 7:11 
QuestionIs there any license limitation ? PinmemberMember 449889214-Jun-09 22:46 
GeneralQuerySubKeys PinmemberVider1-Aug-07 2:31 
GeneralRe: QuerySubKeys Pinmemberkid_sputnik7-Oct-07 5:27 
GeneralRegistry problem when UNICODE is defined Pinmemberrajan40083-Aug-06 5:09 
AnswerRe: Registry problem when UNICODE is defined Pinmemberchsml7-Oct-06 9:50 
GeneralRegnum buffer PinmemberJRaiden31-Jul-06 0:40 
NewsNT Native Registry API version of this here! PinmemberDan Madden19-Jun-06 18:29 
GeneralRead type Binary PinmemberDRLaverdure16-May-06 7:37 
I am trying to read a key of the type Binary, I do not see any function for this, The data is actually a person's name so I need to read a type Binary into a CSrting
 
Example: 44 00 6F 00 6E 00 20 00 4C 00 61 00 76 00 65 00 72 00 64 00 75 00 72 00 65
 
Converted=Don Laverdure
 
Any suggestions?Big Grin | :-D
 

 
Cheers,
Don
NewsRe: Read type Binary PinmemberDan Madden19-Jun-06 18:32 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Mobile
Web03 | 2.8.140721.1 | Last Updated 18 Nov 1999
Article Copyright 1999 by Robert Pittenger, MCPD-EAD
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid