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fix: fixed crash when env var "computername" does not exist

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This commit is contained in:
Notselwyn 2023-04-14 21:18:08 +02:00
parent c201389af4
commit efb3c8056a
1 changed files with 3 additions and 2 deletions
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5
SafeExamBrowser.SystemComponents/VirtualMachineDetector.cs
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@ -136,7 +136,9 @@ namespace SafeExamBrowser.SystemComponents
// check Windows timeline caches for current hardware config // check Windows timeline caches for current hardware config
var deviceCacheKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey($"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\TaskFlow\\DeviceCache"); var deviceCacheKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey($"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\TaskFlow\\DeviceCache");
if (deviceCacheKey != null) var currHostname = System.Environment.GetEnvironmentVariable("COMPUTERNAME");
if (deviceCacheKey != null && currHostname != null)
{ {
foreach (var cacheId in deviceCacheKey.GetSubKeyNames()) foreach (var cacheId in deviceCacheKey.GetSubKeyNames())
{ {
@ -147,7 +149,6 @@ namespace SafeExamBrowser.SystemComponents
continue; continue;
} }
var currHostname = System.Environment.GetEnvironmentVariable("COMPUTERNAME").ToLower();
var cacheHostname = ((string) cacheKey.GetValue("DeviceName")).ToLower(); var cacheHostname = ((string) cacheKey.GetValue("DeviceName")).ToLower();
// windows timeline syncs with other hosts that a user has logged into: check hostname to only check this device // windows timeline syncs with other hosts that a user has logged into: check hostname to only check this device