public static extern int DismOpenSession(string imagePath, string windowsDirectory, string systemDrive, out DismSession session);
public static extern int DismGetFeatureInfo(DismSession session, string featureName, string identifier, DismPackageIdentifier packageIdentifier, out IntPtr pFeatureInfo);
/// <summary>
/// Gets the state of the feature.
/// </summary>
public static DismPackageFeatureState GetFeatureState(string featureName)
{
featureName.Validate("featureName");
var logFile = Path.GetTempFileName();
DismSession session = null;
IntPtr pFeatureInfo = IntPtr.Zero;
try
{
DeployerTrace.WriteInfo("Dism initializing...");
Execute(() => DismNativeMethods.DismInitialize(DismLogLevel.LogErrorsWarnings, logFile, null));
DeployerTrace.WriteInfo("Dism initializing completed, opening online session...");
Execute(() => DismNativeMethods.DismOpenSession(DismOnlineImagePath, null, null, out session));
if (session == null)
{
throw new InvalidOperationException("NativeMethods.DismOpenSession: session out parameter is null. Not continuing further.");
}
DeployerTrace.WriteInfo("Dism opening online session completed, getting feature info...");
Execute(() => DismNativeMethods.DismGetFeatureInfo(session, featureName, string.Empty, DismPackageIdentifier.None, out pFeatureInfo));
if (pFeatureInfo == IntPtr.Zero)
{
throw new InvalidOperationException("NativeMethods.DismGetFeatureInfo pFeatureInfo out parameter is Zero. Not continuing further.");
}
var featureInfo = (DismFeatureInfo)Marshal.PtrToStructure(pFeatureInfo, typeof(DismFeatureInfo));
DeployerTrace.WriteInfo("Dism feature {0} is in state: {1}", featureName, featureInfo.FeatureState);
return(featureInfo.FeatureState);
}
catch (Exception ex)
{
DeployerTrace.WriteWarning("Error detecting if {0} feature is present. Exception: {1}", featureName, ex);
throw;
}
finally
{
try
{
if (session != null)
{
DeployerTrace.WriteInfo("Dism closing session...");
Execute(() => DismNativeMethods.DismCloseSession(session.DangerousGetHandle()));
DeployerTrace.WriteInfo("Dism closing session completed");
}
else
{
DeployerTrace.WriteInfo("Dism session is null, closing session not required");
}
DeployerTrace.WriteInfo("Dism shutting down...");
Execute(DismNativeMethods.DismShutdown);
DeployerTrace.WriteInfo("Dism shutting down completed");
if (File.Exists(logFile))
{
// log file isn't too big
string text = File.ReadAllText(logFile);
DeployerTrace.WriteInfo("Dism log file content: {0}{1}", Environment.NewLine, text);
File.Delete(logFile);
}
}
catch (Exception ex)
{
DeployerTrace.WriteWarning("Error while cleaning up Dism state. Ignoring and trying to continue. Exception: {0}", ex);
}
}
}
