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51 lines
1.7 KiB
JavaScript
51 lines
1.7 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
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this.EXPORTED_SYMBOLS = ["WindowsRegistry"];
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const WindowsRegistry = {
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/**
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* Safely reads a value from the registry.
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*
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* @param aRoot
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* The root registry to use.
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* @param aPath
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* The registry path to the key.
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* @param aKey
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* The key name.
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* @return The key value or undefined if it doesn't exist. If the key is
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* a REG_MULTI_SZ, an array is returned.
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*/
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readRegKey: function(aRoot, aPath, aKey) {
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const kRegMultiSz = 7;
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let registry = Cc["@mozilla.org/windows-registry-key;1"].
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createInstance(Ci.nsIWindowsRegKey);
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try {
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registry.open(aRoot, aPath, Ci.nsIWindowsRegKey.ACCESS_READ);
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if (registry.hasValue(aKey)) {
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let type = registry.getValueType(aKey);
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switch (type) {
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case kRegMultiSz:
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// nsIWindowsRegKey doesn't support REG_MULTI_SZ type out of the box.
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let str = registry.readStringValue(aKey);
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return [v for each (v in str.split("\0")) if (v)];
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case Ci.nsIWindowsRegKey.TYPE_STRING:
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return registry.readStringValue(aKey);
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case Ci.nsIWindowsRegKey.TYPE_INT:
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return registry.readIntValue(aKey);
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default:
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throw new Error("Unsupported registry value.");
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}
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}
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} catch (ex) {
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} finally {
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registry.close();
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}
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return undefined;
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},
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};
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