VC registry functions

Recently, when I was working on a project, I used some functions that operate the Registry. Now I want to record these functions for future use.
1. Open the registry key long regopenkeyex (hkey, // handle to open key primary key lpctstr lpsubkey, // subkey name subkey DWORD uloptions, // reserved. Must be 0 regsam samdesired, // security access mask read/write identity phkey phkresult // handle to open key returned hkey type pointer. Later, read/write, close using this pointer );
 
For example: // open the SOFTWARE \ cleaner subkey hkey under the HKEY_LOCAL_MACHINE primary key; hkey hkeyroot = HKEY_LOCAL_MACHINE; long ret0 = (: regopenkeyex (hkeyroot, "Software \ cleaner", 0, key_read, & hkey); If (ret0! = Error_success) // If the hkey cannot be opened, stop the program execution {afxmessagebox ("error: Unable to open the relevant hkey"); return ;}
2. read LONG RegQueryValueEx (HKEY hKey, // handle to key open the Registry pointer LPCTSTR lpValueName, // value name the key name to be read LPDWORD lpReserved, // reserved must be NULL. must be null lpdword lpType, // type buffer, key type. I usually use REG_SZ, REG_DWORD LPBYTE lpData, // data buffer. The buffer LPDWORD lpcbData // size of data buffer that saves the query results. Buffer size); for example, // hKEY is the pointer obtained when it is opened above. LPBYTE getValue = new BYTE [80]; // The obtained key value DWORD keyType = REG_SZ; // defines the data type DWORD DataLen = 80; // define the Data Length CString strUser = _ T ("Version"); // The key name to be queried long ret1 =: RegQueryValueEx (hKEY, strUser, NULL, & keyType, getValue, & DataLen); if (ret1! = ERROR_SUCCESS) {AfxMessageBox ("error: Unable to query the relevant registry information"); return ;}
 
3. Write the Registry LONG RegSetValueEx (HKEY hKey, // handle to key. Open the Registry pointer LPCTSTR lpValueName, // value name to write the key DWORD Reserved, // reserved must be 0 DWORD dwType, // value type write value type const byte * lpData, // value data: DWORD cbData // size of value data. Data SIZE); for example: // write the registry. Change Version to 1.0.12 // write data of the CString type CString strVersion = _ T ("Version"); // The Name Of The Key to be written: LPCTSTR strVersionValue = "1.0.12"; long ret =:: RegSetValueEx (hKEY, strVersion, 0, REG_SZ, (const BYTE *) strVersionValue, strlen (strVersionValue) + 1); if (ret! = ERROR_SUCCESS) {AfxMessageBox ("error: Unable to query the relevant registry information"); return;} [/code]
 
4. Create a new key LONG RegCreateKeyEx (HKEY hKey, // handle to open key. Open the Registry pointer maid, // subkey name. The subkey name is DWORD Reserved, // reserved. It must be 0 LPTSTR lpClass, // class string. It is used when it already exists. Generally, it is null dword dwOptions, // special options // default value: REG_OPTION_VOLATILE, Which is saved in the Registry and will still exist at next boot. // REG_OPTION_VOLATILE, stored in the memory // REG_OPTION_BACKUP_RESTORE REGSAM samDesired, // desired security access. Operation permission. Generally, KEY_ALL_ACCESS, unless you have special requirements, please refer to MSDN LPSECURITY_ATTRIBUTES lpSecurityAttributes, // inheritance. Inheritance. It is generally null phkey phkResult, // key handle. Return the town of this key value. LPDWORD lpdwDisposition // disposition value buffer // REG_CREATED_NEW_KEY The key did not exist and was created. // REG_OPENED_EXISTING_KEY The key existed and was simply opened without being changed.
);
 
5. delete a key LONG RegDeleteKey (HKEY hKey, // handle to open key LPCTSTR lpSubKey // subkey name );
 
6. delete a key value LONG RegDeleteValue (HKEY hKey, // handle to key LPCTSTR lpValueName/value name. Value Name, not the opened pointer, but the queried pointer. If it is null, the value created by RegSetValueEx will be deleted );
 
7. Refresh the Registry LONG RegFlushKey (HKEY hKey // handle to key to write. Write all values in the given pointer );
// This function writes the changed data directly to the hard disk. Do not use this function frequently, which may affect the performance.
 
8. Import a registry file to LONG RegLoadKey (HKEY hKey, // handle to open key LPCTSTR lpSubKey, // subkey name LPCTSTR lpFile // registry file name) under the specified key );
// Useless
 
9. close the opened registry LONG RegCloseKey (HKEY hKey // handle to key to close );
// Close and release the pointer to the opened registry.