registry.cpp

此源码包含的是《com原理与应用》一书中的源代码。

//
// Registry.cpp
//

#include <objbase.h>
#include <assert.h>

#include "Registry.h"

////////////////////////////////////////////////////////
//
// Internal helper functions prototypes
//
//   - These helper functions were borrowed and modifed from
//     Dale Rogerson's book Inside COM.

// Set the given key and its value.
BOOL SetKeyAndValue(const char* pszPath,
                    const char* szSubkey,
                    const char* szValue) ;

// Convert a CLSID into a char string.
void CLSIDtoString(const CLSID& clsid, 
                 char* szCLSID,
                 int length) ;

// Delete szKeyChild and all of its descendents.
LONG DeleteKey(HKEY hKeyParent, const char* szKeyString) ;

////////////////////////////////////////////////////////
//
// Constants
//

// Size of a CLSID as a string
const int CLSID_STRING_SIZE = 39 ;

/////////////////////////////////////////////////////////
//
// Public function implementation
//

//
// Register the component in the registry.
//
HRESULT RegisterServer(const CLSID& clsid,         // Class ID
                       const char *szFileName,     // DLL module handle
                       const char* szProgID,       //   IDs
                       const char* szDescription,  // Description String
					   const char* szVerIndProgID) // optional

{
	// Convert the CLSID into a char.
	char szCLSID[CLSID_STRING_SIZE] ;
	CLSIDtoString(clsid, szCLSID, sizeof(szCLSID)) ;

	// Build the key CLSID\\{...}
	char szKey[64] ;
	strcpy(szKey, "CLSID\\") ;
	strcat(szKey, szCLSID) ;
  
	// Add the CLSID to the registry.
	SetKeyAndValue(szKey, NULL, szDescription) ;

	// Add the server filename subkey under the CLSID key.
	SetKeyAndValue(szKey, "InprocServer32", szFileName) ;

	// Add the ProgID subkey under the CLSID key.
	if (szProgID != NULL) {
		SetKeyAndValue(szKey, "ProgID", szProgID) ;
		SetKeyAndValue(szProgID, "CLSID", szCLSID) ;
	}

	if (szVerIndProgID) {
		// Add the version-independent ProgID subkey under CLSID key.
		SetKeyAndValue(szKey, "VersionIndependentProgID",
					   szVerIndProgID) ;

		// Add the version-independent ProgID subkey under HKEY_CLASSES_ROOT.
		SetKeyAndValue(szVerIndProgID, NULL, szDescription) ; 
		SetKeyAndValue(szVerIndProgID, "CLSID", szCLSID) ;
		SetKeyAndValue(szVerIndProgID, "CurVer", szProgID) ;

		// Add the versioned ProgID subkey under HKEY_CLASSES_ROOT.
		SetKeyAndValue(szProgID, NULL, szDescription) ; 
		SetKeyAndValue(szProgID, "CLSID", szCLSID) ;
	}

	return S_OK ;
}

//
// Remove the component from the registry.
//
HRESULT UnregisterServer(const CLSID& clsid,      // Class ID
                      const char* szProgID,       //   IDs
                      const char* szVerIndProgID) // Programmatic
{
	// Convert the CLSID into a char.
	char szCLSID[CLSID_STRING_SIZE] ;
	CLSIDtoString(clsid, szCLSID, sizeof(szCLSID)) ;

	// Build the key CLSID\\{...}
	char szKey[64] ;
	strcpy(szKey, "CLSID\\") ;
	strcat(szKey, szCLSID) ;

	// Delete the CLSID Key - CLSID\{...}
	LONG lResult = DeleteKey(HKEY_CLASSES_ROOT, szKey) ;

	// Delete the version-independent ProgID Key.
	if (szVerIndProgID != NULL)
		lResult = DeleteKey(HKEY_CLASSES_ROOT, szVerIndProgID) ;

	// Delete the ProgID key.
	if (szProgID != NULL)
		lResult = DeleteKey(HKEY_CLASSES_ROOT, szProgID) ;

	return S_OK ;
}

///////////////////////////////////////////////////////////
//
// Internal helper functions
//

// Convert a CLSID to a char string.
void CLSIDtoString(const CLSID& clsid,
                 char* szCLSID,
                 int length)
{
	assert(length >= CLSID_STRING_SIZE) ;
	// Get CLSID
	LPOLESTR wszCLSID = NULL ;
	HRESULT hr = StringFromCLSID(clsid, &wszCLSID) ;
	assert(SUCCEEDED(hr)) ;

	// Covert from wide characters to non-wide.
	wcstombs(szCLSID, wszCLSID, length) ;

	// Free memory.
	CoTaskMemFree(wszCLSID) ;
}

//
// Delete a key and all of its descendents.
//
LONG DeleteKey(HKEY hKeyParent,           // Parent of key to delete
               const char* lpszKeyChild)  // Key to delete
{
	// Open the child.
	HKEY hKeyChild ;
	LONG lRes = RegOpenKeyEx(hKeyParent, lpszKeyChild, 0,
	                         KEY_ALL_ACCESS, &hKeyChild) ;
	if (lRes != ERROR_SUCCESS)
	{
		return lRes ;
	}

	// Enumerate all of the decendents of this child.
	FILETIME time ;
	char szBuffer[256] ;
	DWORD dwSize = 256 ;
	while (RegEnumKeyEx(hKeyChild, 0, szBuffer, &dwSize, NULL,
	                    NULL, NULL, &time) == S_OK)
	{
		// Delete the decendents of this child.
		lRes = DeleteKey(hKeyChild, szBuffer) ;
		if (lRes != ERROR_SUCCESS)
		{
			// Cleanup before exiting.
			RegCloseKey(hKeyChild) ;
			return lRes;
		}
		dwSize = 256 ;
	}

	// Close the child.
	RegCloseKey(hKeyChild) ;

	// Delete this child.
	return RegDeleteKey(hKeyParent, lpszKeyChild) ;
}

//
// Create a key and set its value.
//
BOOL SetKeyAndValue(const char* szKey,
                    const char* szSubkey,
                    const char* szValue)
{
	HKEY hKey;
	char szKeyBuf[1024] ;

	// Copy keyname into buffer.
	strcpy(szKeyBuf, szKey) ;

	// Add subkey name to buffer.
	if (szSubkey != NULL)
	{
		strcat(szKeyBuf, "\\") ;
		strcat(szKeyBuf, szSubkey ) ;
	}

	// Create and open key and subkey.
	long lResult = RegCreateKeyEx(HKEY_CLASSES_ROOT ,
	                              szKeyBuf, 
	                              0, NULL, REG_OPTION_NON_VOLATILE,
	                              KEY_ALL_ACCESS, NULL, 
	                              &hKey, NULL) ;
	if (lResult != ERROR_SUCCESS)
	{
		return FALSE ;
	}

	// Set the Value.
	if (szValue != NULL)
	{
		RegSetValueEx(hKey, NULL, 0, REG_SZ, 
		              (BYTE *)szValue, 
		              strlen(szValue)+1) ;
	}

	RegCloseKey(hKey) ;
	return TRUE ;
}