4 files changed, 39 insertions, 6 deletions
diff --git a/lib/ShadowCopy/LockFile.cpp b/lib/ShadowCopy/LockFile.cpp
index 7df3ec66..523b01bb 100644
--- a/lib/ShadowCopy/LockFile.cpp
+++ b/lib/ShadowCopy/LockFile.cpp
@@ -1,7 +1,7 @@
 // **************************************************************************
 // * This file is part of the FreeFileSync project. It is distributed under *
 // * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
-// * Copyright (C) 2008-2011 ZenJu (zhnmju123 AT gmx.de)                    *
+// * Copyright (C) ZenJu (zhnmju123 AT gmx DOT de) - All Rights Reserved    *
 // **************************************************************************
 
 
diff --git a/lib/ShadowCopy/dll_main.cpp b/lib/ShadowCopy/dll_main.cpp
index 3805c99d..46c65311 100644
--- a/lib/ShadowCopy/dll_main.cpp
+++ b/lib/ShadowCopy/dll_main.cpp
@@ -1,7 +1,7 @@
 // **************************************************************************
 // * This file is part of the FreeFileSync project. It is distributed under *
 // * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
-// * Copyright (C) 2008-2011 ZenJu (zhnmju123 AT gmx.de)                    *
+// * Copyright (C) ZenJu (zhnmju123 AT gmx DOT de) - All Rights Reserved    *
 // **************************************************************************
 
 
diff --git a/lib/ShadowCopy/shadow.cpp b/lib/ShadowCopy/shadow.cpp
index 5047a698..fc95381d 100644
--- a/lib/ShadowCopy/shadow.cpp
+++ b/lib/ShadowCopy/shadow.cpp
@@ -1,7 +1,7 @@
 // **************************************************************************
 // * This file is part of the FreeFileSync project. It is distributed under *
 // * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
-// * Copyright (C) 2008-2011 ZenJu (zhnmju123 AT gmx.de)                    *
+// * Copyright (C) ZenJu (zhnmju123 AT gmx DOT de) - All Rights Reserved    *
 // **************************************************************************
 
 #include "shadow.h"
@@ -46,6 +46,35 @@ struct shadow::ShadowData
 
 namespace
 {
+std::wstring formatVssError(HRESULT hr) //at least the one's from IVssBackupComponents::AddToSnapshotSet; return empty if no format found
+{
+    switch (hr)
+    {
+        case VSS_E_BAD_STATE:
+            return L"VSS_E_BAD_STATE";
+        case VSS_E_MAXIMUM_NUMBER_OF_VOLUMES_REACHED:
+            return L"VSS_E_MAXIMUM_NUMBER_OF_VOLUMES_REACHED";
+        case VSS_E_MAXIMUM_NUMBER_OF_SNAPSHOTS_REACHED:
+            return L"VSS_E_MAXIMUM_NUMBER_OF_SNAPSHOTS_REACHED";
+        case VSS_E_OBJECT_NOT_FOUND:
+            return L"VSS_E_OBJECT_NOT_FOUND";
+        case VSS_E_PROVIDER_NOT_REGISTERED:
+            return L"VSS_E_PROVIDER_NOT_REGISTERED";
+        case VSS_E_PROVIDER_VETO:
+            return L"VSS_E_PROVIDER_VETO";
+        case VSS_E_VOLUME_NOT_SUPPORTED:
+            return L"VSS_E_VOLUME_NOT_SUPPORTED";
+        case VSS_E_VOLUME_NOT_SUPPORTED_BY_PROVIDER:
+            return L"VSS_E_VOLUME_NOT_SUPPORTED_BY_PROVIDER";
+        case VSS_E_UNEXPECTED_PROVIDER_ERROR:
+            return L"VSS_E_UNEXPECTED_PROVIDER_ERROR";
+        default:
+            return std::wstring();
+    }
+}
+
+
+
 inline
 void copyString(const std::wstring& input, wchar_t* buffer, size_t bufferSize)
 {
@@ -92,7 +121,7 @@ shadow::ShadowData createShadowCopy(const wchar_t* volumeName) //throw ComError
 
     VSS_ID snapshotSetId = {};
     ZEN_CHECK_COM(backupComp->StartSnapshotSet(&snapshotSetId));
-    ScopeGuard guardSnapShot = makeGuard([&]() { backupComp->AbortBackup(); });
+    ScopeGuard guardSnapShot = makeGuard([&] { backupComp->AbortBackup(); });
     //Quote: "This method must be called if a backup operation terminates after the creation of a
     //shadow copy set with "StartSnapshotSet" and before "DoSnapshotSet" returns."
 
@@ -103,7 +132,11 @@ shadow::ShadowData createShadowCopy(const wchar_t* volumeName) //throw ComError
         {
             if (hr == VSS_E_VOLUME_NOT_SUPPORTED)
                 throw ComError(L"Volume Shadow Copy Service is not supported on this volume!");
-            throw ComError(L"Error calling \"backupComp->AddToSnapshotSet\".", hr);
+            const std::wstring vssError = formatVssError(hr);
+            if (!vssError.empty())
+                throw ComError(L"Error calling \"backupComp->AddToSnapshotSet\": " + vssError);
+            else
+                throw ComError(L"Error calling \"backupComp->AddToSnapshotSet\".", hr);
         }
     }
 
diff --git a/lib/ShadowCopy/shadow.h b/lib/ShadowCopy/shadow.h
index 68b7141f..ea113dae 100644
--- a/lib/ShadowCopy/shadow.h
+++ b/lib/ShadowCopy/shadow.h
@@ -1,7 +1,7 @@
 // **************************************************************************
 // * This file is part of the FreeFileSync project. It is distributed under *
 // * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
-// * Copyright (C) 2008-2011 ZenJu (zhnmju123 AT gmx.de)                    *
+// * Copyright (C) ZenJu (zhnmju123 AT gmx DOT de) - All Rights Reserved    *
 // **************************************************************************
 
 #ifndef SHADOWCOPY_H