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What is SaveKey in the winreg Python module?

Adnan Abbas

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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winreg - Windows registry access provides functions that expose the Windows registry API to Python. Windows registry is a collection of databases that stores the information and settings of software programs, hardware devices, user preferences, and operating-system configurations.

Registry handle objects

winreg uses a handle object as the registry handle to ensure that the handles are closed correctly, even in cases where the programmer might forget to close them.

The handle object wraps a windows HKEY object and automatically closes it when the object is destroyed. It also supports comparison semantics, so two handle objects will compare true if both of them point to the same Windows underlying handle value.

SaveKey method

SaveKey saves the specified key and all its subkeys in the specified file provided in the function’s arguments.

Syntax

winreg.SaveKey(key, file_name)

Parameters

  • key is an already opened key or one of the predefined HKEY_* constants. HKEY constants correspond to various registry entries such as environment variable settings, the physical state of the computer, user preferences, network connections, etc.
  • file_name is the file’s name in which the registry data is saved. This file should be new, i.e., it should not already exist. Moreover, if the file name includes a path, it cannot be used on file allocation table (FAT) file systems by the LoadKey method.

While working with remote systems, the path mentioned in the file_name argument should be relative to the remote computer. In addition, the caller of this function must have the SeBackupPrivilege.

Return value

This method raises an auditing event winreg.SaveKey with the arguments key,filename. An audit event is raised when an OS system-level change is made to be reported to the system audit logger that runs as part of the kernel.

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Adnan Abbas
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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