C++如何读写注册表

1.如何向注册表中写值

//写入注册表为DWORD类型bool SetRegValue(LPCTSTR lpSubKey, LPCTSTR lpValueName, DWORD dwValueKey){bool bRet = false;HKEY hKey;DWORD dwDispoistion = REG_OPENED_EXISTING_KEY;if (ERROR_SUCCESS == ::RegCreateKeyEx(HKEY_LOCAL_MACHINE, lpSubKey, 0, NULL, REG_OPTION_NON_VOLATILE,KEY_WRITE, NULL, &hKey, &dwDispoistion)){if (ERROR_SUCCESS == ::RegSetValueEx(hKey, lpValueName, 0, REG_DWORD, (BYTE*)&dwValueKey, sizeof(DWORD))){bRet = true;}}::RegCloseKey(hKey);return bRet;}

// 写入注册表为LPCTSTR 类型bool SetRegValue(LPCTSTR lpSubKey, LPCTSTR lpValueName, LPCTSTR lpValueKey){bool bRet = false;HKEY hKey;DWORD dwDisposition = REG_OPENED_EXISTING_KEY;if (ERROR_SUCCESS == ::RegCreateKeyEx(HKEY_LOCAL_MACHINE, lpSubKey, 0, NULL, REG_OPTION_NON_VOLATILE,KEY_WRITE, NULL, &hKey, &dwDisposition)){if (ERROR_SUCCESS == ::RegSetValueEx(hKey, lpValueName, 0, REG_SZ, (BYTE*)lpValueKey,_tcslen(lpValueKey) * sizeof(TCHAR))){bRet = true;}}::RegCloseKey(hKey);return bRet;}

注：其中上面HKEY_LOCAL_MACHINE代表注册表中 众多主目录中的一个目录，也可以是其他主目录

写注册表示例如下：

//写入DWORD类型SetRegValue(L"SYSTEM\\CurrentControlSet\\Services\\USBSTOR",L"Start", 8);//写入LPCTSTR类型LPCTSTR lpSubKey = L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\RoomManagement";LPCTSTR lpValue = L"hello world";bool bRet = SetRegValue(lpSubKey, L"YourKey", lpValue); //参数二三分别代表要写入的 键和值

2.如何读取注册表的值

// 读注册表的值(output --- wstring)bool GetRegValue(HKEY hMainKey, LPCTSTR lpSubKey, LPCTSTR lpValueName, std::wstring& wstrReturn/*out*/){bool bRet = false;HKEY hKey;if (ERROR_SUCCESS == ::RegOpenKeyEx(hMainKey, lpSubKey, 0, KEY_READ, &hKey)){DWORD dwType = REG_SZ;TCHAR szReturnValue[MAX_PATH + 1] = { 0 };DWORD dwSize;if (ERROR_SUCCESS == ::RegQueryValueEx(hKey, lpValueName, NULL, &dwType, (LPBYTE)szReturnValue, &dwSize)){wstrReturn = szReturnValue;bRet = true;}}::RegCloseKey(hKey);return bRet;}

// 读出册表(output --- string)bool GetRegValue(LPCTSTR lpSubKey, LPCTSTR lpValueName, std::string& strReturn/*out*/){bool bRet = false;HKEY hKey;if (ERROR_SUCCESS == ::RegOpenKeyEx(HKEY_LOCAL_MACHINE, lpSubKey, 0, KEY_READ, &hKey)){DWORD dwType = REG_SZ;TCHAR szReturnValue[MAX_PATH + 1] = { 0 };DWORD dwSize;if (ERROR_SUCCESS == ::RegQueryValueEx(hKey, lpValueName, NULL, &dwType, (LPBYTE)szReturnValue, &dwSize)){// 将宽字节转换成多字节int dwBufSize = ::WideCharToMultiByte(CP_OEMCP, 0, szReturnValue, -1, NULL, 0, NULL, FALSE);char *buff = new char[dwBufSize];memset(buff, 0, dwBufSize);if (::WideCharToMultiByte(CP_OEMCP, 0, szReturnValue, -1, buff, dwBufSize, NULL, FALSE)){strReturn = buff;delete[] buff;buff = NULL;}bRet = true;}}::RegCloseKey(hKey);return bRet;}

读注册表示例如下：

//读取wstring类型LPCTSTR lpSubkey = _T("Software\\Microsoft\\Windows\\CurrentVersion\\YourFileName");wstringwsValue;GetRegValue(HKEY_CURRENT_USER, lpSubkey, _T("YourKey"), wsValue);//读取string类型string strValue;LPCTSTR lpSubKey = _T("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\YourFileName");GetRegValue(lpSubKey, _T("YourKey"), strValue);