A Context Menu Handler for Windows Users That Can't Let Go

#define _CCPERSIST_CPP_
#include "StdAfx.h"
#include ".\ccpersist.h"

LPCTSTR g_szCMDCMX_RegKey = TEXT("Software\\Harrington\\CMDCMX");
LPCTSTR g_szCMDCMXRun_RegKey = TEXT("Software\\Harrington\\CMDCMX\\Run Param History");
LPCTSTR g_szCMDCMXApplicationForDosBox_StringValue = TEXT("Application For Command Window");
LPCTSTR g_szCMDCMXShowRunOnFileMenuItem_DwordValue = TEXT("Show Run MenuItem");
LPCTSTR g_szCMDCMXShowRunOnFileMenuItem_StringValue = TEXT("Add Run MenuItem To");
LPCTSTR g_szCMDCMXShowOpenInCMDWNDMenuItem_DwordValue = TEXT("Show OpenInCMDWindow MenuItem");
LPCTSTR g_szCMDCMXShowCopyPathNameMenuItem_DwordValue = TEXT("Show CopyPathName MenuItem");
LPCTSTR g_szCMDCMXShowCopyShortPathNameMenuItem_DwordValue = TEXT("Show CopyShortPathName MenuItem");

CPersist::CPersist(void)
{
}

CPersist::~CPersist(void)
{
}

HRESULT CPersist::ShowMenuItem( int& nShow, LPCTSTR szKey )
{
	HRESULT hRes;
	DWORD dwDisp;
	HKEY hKey = NULL;

	// Open the key... create it if it doesn't already exist.
	if( (hRes = ::RegCreateKeyEx( HKEY_LOCAL_MACHINE, g_szCMDCMX_RegKey, 0, NULL,
		REG_OPTION_NON_VOLATILE, KEY_READ|KEY_WRITE, NULL, &hKey, &dwDisp)) == ERROR_SUCCESS )
	{
		DWORD dwType, dw = sizeof(int);
		// default to true.
		nShow = 1;
		hRes = ::RegQueryValueEx(  hKey, szKey, 0, &dwType, (UCHAR*)&nShow, &dw );
		::RegCloseKey( hKey );
	}
	return hRes;
}

int CPersist::ReadFromRegistry_FileMenuItemsToAdd( bool& bShowRunOnFileMenuItem, bool& bShowOpenInDosMenuItem, bool& bShowCopyPathNameMenuItem, bool& bShowCopyShortPathNameMenuItem )
{
	int nShow = 0;
	int nShowCount = 0;

	nShowCount = ReadFromRegistry_FolderMenuItemsToAdd(bShowOpenInDosMenuItem, bShowCopyPathNameMenuItem, bShowCopyShortPathNameMenuItem);

	ShowMenuItem( nShow, g_szCMDCMXShowRunOnFileMenuItem_DwordValue );
	if( nShow )
	{
		bShowRunOnFileMenuItem = true;
		nShowCount++;
	}
	return nShowCount;
}

int CPersist::ReadFromRegistry_FolderMenuItemsToAdd( bool& bShowOpenInDosMenuItem, bool& bShowCopyPathNameMenuItem, bool& bShowCopyShortPathNameMenuItem )
{
	int nShow = 0;
	int nShowCount = 0;

	ShowMenuItem( nShow, g_szCMDCMXShowOpenInCMDWNDMenuItem_DwordValue );
	if( nShow )
	{
		bShowOpenInDosMenuItem = true;
		nShowCount++;
	}

	ShowMenuItem( nShow, g_szCMDCMXShowCopyPathNameMenuItem_DwordValue );
	if( nShow )
	{
		bShowCopyPathNameMenuItem = true;
		nShowCount++;
	}

	ShowMenuItem( nShow, g_szCMDCMXShowCopyShortPathNameMenuItem_DwordValue );
	if( nShow )
	{
		bShowCopyShortPathNameMenuItem = true;
		nShowCount++;
	}
	return nShowCount;
}

int CPersist::ReadFromRegistry_FileTypesToAddRunMenuItemTo( LPTSTR pszTypes )
{
	DWORD dwDisp;
	HKEY hKey = NULL;
	HRESULT hRes = E_FAIL;

	// Open the key... create it if it doesn't already exist.
	if( ::RegCreateKeyEx( HKEY_LOCAL_MACHINE, g_szCMDCMX_RegKey, 0, NULL,
		REG_OPTION_NON_VOLATILE, KEY_READ|KEY_WRITE, NULL, &hKey, &dwDisp) == ERROR_SUCCESS )
	{
		DWORD dwType, dw = (2048*sizeof(TCHAR));
		_tcscpy( pszTypes, TEXT("exe, com, bat") );
		hRes = ::RegQueryValueEx(  hKey, g_szCMDCMXShowRunOnFileMenuItem_StringValue, 0, &dwType, (UCHAR*)pszTypes, &dw );
		::RegCloseKey( hKey );
	}
	if( SUCCEEDED(hRes) )
	{
		int i = 0;
		while( pszTypes[i] != NULL )
		{
			pszTypes[i] = LOWORD(tolower(pszTypes[i]));
			i++;
		}
		return 1;
	}
	return 0;
}

int CPersist::ReadFromRegistry_RunApplication( LPTSTR lptstrApplication )
{
	DWORD dwDisp;
	HKEY hKey = NULL;
	HRESULT hRes = E_FAIL;

	// Open the key... create it if it doesn't already exist.
	if( (hRes = ::RegCreateKeyEx( HKEY_LOCAL_MACHINE, g_szCMDCMX_RegKey, 0, NULL,
		REG_OPTION_NON_VOLATILE, KEY_READ|KEY_WRITE, NULL, &hKey, &dwDisp)) == ERROR_SUCCESS )
	{
		DWORD dwType = REG_SZ, dw = (MAX_PATH*sizeof(TCHAR));
		DWORD dwVersion = ::GetVersion(); // Get major and minor version numbers of Windows
		// Do the right thing for the OS - WinNT wants cmd.exe, Win95 wants command.com.
		if (dwVersion < 0x80000000)                // Windows NT
			_tcscpy( lptstrApplication, TEXT("cmd.exe") );
		else
			_tcscpy( lptstrApplication, TEXT("command.com") );

		hRes = ::RegQueryValueEx(  hKey, g_szCMDCMXApplicationForDosBox_StringValue, 0, &dwType, (UCHAR*)lptstrApplication, &dw );
		::RegCloseKey( hKey );

		if( SUCCEEDED(hRes) )
			return 1;
	}
	return 0;
}