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Reading value from a key in Windows Registry (VC++ code)

, 22 Nov 2011
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How to read a value from a key in the Windows Registry.
	wchar_t buffer[MAX_PATH];
	wchar_t* szValueName;
	wchar_t* SubKeyName;
	wchar_t* installPath;
	HKEY hKey;
	DWORD dwBufLen;
	LONG lret;
 
	HRESULT hr = E_FAIL;
	DWORD* reservedNULL = NULL;
	DWORD reservedZero = 0;
 
	szValueName = L"Path";
	SubKeyName = L"SOFTWARE\\7-Zip";
	lret = RegOpenKeyEx(HKEY_LOCAL_MACHINE,
			  SubKeyName,
			  reservedZero,
			  KEY_READ,
			  &hKey);
	if (lret == ERROR_SUCCESS)
	{
		dwBufLen = MAX_PATH;
		lret = RegQueryValueEx(hKey,
				  szValueName,
				  reservedNULL,
				  NULL,
				  (BYTE*)buffer,
				  &dwBufLen);
		if (lret == ERROR_SUCCESS)
		{
		   installPath = buffer;
		   hr = S_OK;
		} // end if successfull value read
		RegCloseKey(hKey);
	} // end if successfule key open

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

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About the Author

Mitendra Anand
Architect
India India
My name is Mitendra Anand and my work is focused around application development which includes a lot of prototyping of new solutions.

While I have a background in C++/VC++ programming, my daily work is mostly spent in C++, Sybase, SQL, Unix/Windows.
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Comments and Discussions

 
GeneralMy vote of 1 Pinmemberluckyrockstar50510-Jul-14 9:53 
GeneralThe method of defining a union RegKeyValue just to get somet... Pinmembernv322-Nov-11 4:46 
GeneralRe: Thanks for correcting it. Your code certainly is more neat. ... PinmemberMitendra Anand22-Nov-11 5:26 
GeneralReason for my vote of 1 Trivial PinmemberMember 351467110-Nov-11 4:04 
GeneralRe: Can you provide me a better way to read the reg value from C... PinmemberMitendra Anand10-Nov-11 4:08 
Can you provide me a better way to read the reg value from C++ code?

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