ResilientChangeTrackingEnabled = true has no effect

[picrap]

If RCT is not enabled, it can’t be enabled using the ResilientChangeTrackingEnabled property:

using var v = VirtualDisk.Open(@"F:\Hyper-V\Windows XP\Virtual Hard Disks\Windows XP.vhdx", false, false, true);
v.ResilientChangeTrackingEnabled = false;

Does nothing (And it does not throw any error).

From a C++ program, invoking the native function works:

HANDLE vhdHandle;
_VIRTUAL_STORAGE_TYPE storageType{};
DWORD res = OpenVirtualDisk(&storageType, L"F:\\Hyper-V\\Windows XP\\Virtual Hard Disks\\Windows XP.vhdx",
        VIRTUAL_DISK_ACCESS_ALL, OPEN_VIRTUAL_DISK_FLAG_NONE, NULL, &vhdHandle);

SET_VIRTUAL_DISK_INFO setDiskInfo{};
setDiskInfo.ChangeTrackingEnabled = true;
setDiskInfo.Version = SET_VIRTUAL_DISK_INFO_CHANGE_TRACKING_STATE;
SetVirtualDiskInformation(vhdHandle, &setDiskInfo);

Please note that ResilientChangeTrackingEnabled = false (disabling RCT) actually works 😅, so RCT can be disabled, but not enabled.

[dahall]

Please try the other Open overload. I believe the issue is related to the mask.

using var v = VirtualDisk.Open(filename, mask: VIRTUAL_DISK_ACCESS_MASK.VIRTUAL_DISK_ACCESS_ALL);
v.ResilientChangeTrackingEnabled = false;

[picrap]

Please try the other Open overload. I believe the issue is related to the mask.

using var v = VirtualDisk.Open(filename, mask: VIRTUAL_DISK_ACCESS_MASK.VIRTUAL_DISK_ACCESS_ALL);
v.ResilientChangeTrackingEnabled = false;

Nope, it does not work either.

[dahall]

Is your main application 64-bit?

[picrap]

The platform target is set to “Any CPU” and I can’t find any other option that could relate to platform.

[dahall]

Are you able to build your EXE with the target of x86 and let me know if setting ResilientChangeTrackingEnabled = true still fails?

[picrap]

That’s a win! It works in x86, fails in x64 and Any CPU.
The fun fact it that ResilientChangeTrackingEnabled = false always succeeds.

[dahall]

Yep. Under 32-bit builds the structure aligns correctly so setting the structure field to 1 works. I'll fix it so it works on both 32 and 64 bit. Thanks for your help.

[dahall]

This is now fixed