How do I put new entries in the registry?

This code puts a new string entry in the registry, under HKEY_CURRENT_USER. It is designed to make the registry look like an INI file, with sections and entries.

static REGSAM PrimarySecAccMask = KEY_QUERY_VALUE |
KEY_SET_VALUE |
KEY_CREATE_SUB_KEY |
KEY_ENUMERATE_SUB_KEYS |
KEY_NOTIFY ;


LONG WINAPI MyRegSetString (const char * szSection,
const char * szEntry,
const char * szValue)
{
char szTreeBranch [120] ;
HKEY hMasterKey = 0 ;
DWORD dwDisposition = 0 ;
HKEY hTopKey = 0 ;
LONG lReturn = 0 ;

// Thou shalt not pass cack.

if (szSection == NULL ||
szEntry == NULL ||
szValue == NULL)
{
return ERROR_INVALID_PARAMETER ;
}

// Select the appropriate tree.

strcpy (szTreeBranch, "Software\\MyCompany\\MyProgram\\");
strcat (szTreeBranch, szSection) ;
hTopKey = HKEY_CURRENT_USER ;

lReturn = RegCreateKeyEx (hTopKey,
szTreeBranch,
0,
szPNC_CLASS,
REG_OPTION_NON_VOLATILE,
PrimarySecAccMask,
NULL,
&hMasterKey,
&dwDisposition);

if (lReturn == ERROR_SUCCESS)
{
// section exists : set the value.

lReturn = RegSetValueEx (hMasterKey,
szEntry,
0,
REG_SZ,
(CONST BYTE *) szValue,
strlen (szValue)+1);
}
else
{
< do some debug >
}

if (hMasterKey)
RegCloseKey (hMasterKey);

return lReturn ;
}

Author : Bob Moore