Reading the registry

How would I go about reading a registry key then saving it to a .txt file? If someone could point me in the right direction or even post sample source code it would be greatly appreciated.
Thanks for any help,
Brian

Hi Brian,

I've include the source for a console app (MyFile.cpp). You can copy & paste the contents of the source file into your own cpp file. Open the file with VC++ and build it. Click ok for all the confirmations to create a project ... You will get a link error. You must select "Use MFC in a shared Dll" from Proect->Settings.

The example demonstrates reading a String Value and an Integer value from the registry. It contains two overloaded functions GetRegVal (one for getting strings & one for getting integers).

MyFile.cpp
------------
#include <afxwin.h>
#include <atlbase.h>

#define MAX_VAL_DATA_LEN 100

CString GetRegVal( const HKEY & hRootKey, const char * szSubKeyPath, const char * szValName, char * szValData )
{
CString strRetMsg;
HKEY hKey;
DWORD dwCount = -1;
if ( RegCreateKey( hRootKey, szSubKeyPath, &hKey ) != ERROR_SUCCESS )
{
strRetMsg.Format( "Error Opening Key (%s)", szSubKeyPath );
return strRetMsg;
}
CRegKey regKey;
regKey.Attach( hKey );
if ( regKey.QueryValue( szValData, szValName, &dwCount ) != ERROR_SUCCESS )
{
strRetMsg.Format( "Error Querrying Value (%s)", szValName );
}
return strRetMsg;
}

CString GetRegVal( const HKEY & hRootKey, const char * szSubKeyPath, const char * szValName, DWORD & dwValData )
{
CString strRetMsg;
HKEY hKey;
if ( RegCreateKey( hRootKey, szSubKeyPath, &hKey ) != ERROR_SUCCESS )
{
strRetMsg.Format( "Error Opening Key (%s)", szSubKeyPath );
return strRetMsg;
}
CRegKey regKey;
regKey.Attach( hKey );
if ( regKey.QueryValue( dwValData, szValName ) != ERROR_SUCCESS )
{
strRetMsg.Format( "Error Querrying Value (%s)", szValName );
}
return strRetMsg;
}

void main()
{
// Get a String Registry Value
char szSubKeyPath[] = "SYSTEM\\Setup\\AnswerFileMap";
char szValName[] = "MS_Server";
char szValData[ MAX_VAL_DATA_LEN ];
CString strRetMsg = GetRegVal( HKEY_LOCAL_MACHINE, szSubKeyPath, szValName, szValData );
if ( strRetMsg == "" )
printf( "szValData = %s\n", szValData );
else
printf( "%s\n", strRetMsg );

// Get an Integer Registry Value
strcpy( szSubKeyPath, "SYSTEM\\Select" );
strcpy( szValName, "Current" );
DWORD dwValData;
strRetMsg = GetRegVal( HKEY_LOCAL_MACHINE, szSubKeyPath, szValName, dwValData );
if ( strRetMsg == "" )
printf( "szValData = %d\n", dwValData );
else
printf( "%s\n", strRetMsg );
}

I hope this works for you.
Kovi