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88 lines
2.9 KiB
JavaScript
88 lines
2.9 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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export var 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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* @param [aRegistryNode=0]
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* Optionally set to nsIWindowsRegKey.WOW64_64 (or nsIWindowsRegKey.WOW64_32)
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* to access a 64-bit (32-bit) key from either a 32-bit or 64-bit application.
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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(aRoot, aPath, aKey, aRegistryNode = 0) {
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const kRegMultiSz = 7;
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const kMode = Ci.nsIWindowsRegKey.ACCESS_READ | aRegistryNode;
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let registry = Cc["@mozilla.org/windows-registry-key;1"].createInstance(
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Ci.nsIWindowsRegKey
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);
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try {
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registry.open(aRoot, aPath, kMode);
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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 str.split("\0").filter(v => 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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* Safely removes a key 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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* @param [aRegistryNode=0]
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* Optionally set to nsIWindowsRegKey.WOW64_64 (or nsIWindowsRegKey.WOW64_32)
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* to access a 64-bit (32-bit) key from either a 32-bit or 64-bit application.
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* @return True if the key was removed or never existed, false otherwise.
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*/
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removeRegKey(aRoot, aPath, aKey, aRegistryNode = 0) {
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let registry = Cc["@mozilla.org/windows-registry-key;1"].createInstance(
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Ci.nsIWindowsRegKey
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);
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let result = false;
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try {
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let mode =
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Ci.nsIWindowsRegKey.ACCESS_QUERY_VALUE |
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Ci.nsIWindowsRegKey.ACCESS_SET_VALUE |
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aRegistryNode;
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registry.open(aRoot, aPath, mode);
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if (registry.hasValue(aKey)) {
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registry.removeValue(aKey);
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result = !registry.hasValue(aKey);
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} else {
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result = true;
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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 result;
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},
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};
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