virtualbox.org

Hi gues! I use VirtualBox and Virtual Box API Microsoft Com C++ for my project.
It’s VirtualBox 6.0.6 Software Developer Kit (SDK) and VirtualBox 6.0.6 platform packages .
I have a problem. I want to recover a snapshot system, that was created early, but the program shows errors.
My code with comments:

Code: Select all

HRESULT rc; 

IVirtualBoxClient *virtualBoxClient = nullptr; 
IVirtualBox *virtualBox = nullptr; 
IMachine *machine = nullptr; 
ISession *session = nullptr; 
IProgress *progress = nullptr; 
ISnapshot* snapshot = nullptr; 

BSTR sessiontype = SysAllocString(L"gui"); 
BSTR machineName = SysAllocString(L"Win7x64"); 


HRESULT rc = CoCreateInstance(CLSID_VirtualBoxClient, NULL, CLSCTX_INPROC_SERVER, IID_IVirtualBoxClient, (void**)&virtualBoxClient); 

rc = virtualBoxClient->get_VirtualBox(&virtualBox); 

// looking for a machine with a name Win7x64 
rc = virtualBox->FindMachine(machineName, &machine); 

// create a session object 
rc = CoCreateInstance(CLSID_Session, NULL, CLSCTX_INPROC_SERVER, IID_ISession, (void**)&session); 
if (!SUCCEEDED(rc)) 
{ 
printf("Error creating Session instance! rc = 0x%x\n", rc); 
break; 
} 

// block the machine 
machine->LockMachine(session, LockType::LockType_Shared); 

// the name of the snapshot system 
BSTR snapshotUUID = SysAllocString(L"Win7_test_snapshot"); 
// looking for a snapshot system 
rc = machine->FindSnapshot(snapshotUUID, &snapshot); 
// recover snapshot. ERROR: variable rc - E_NOTIMPL Not implemented. 
rc = machine->RestoreSnapshot(snapshot, &progress); 

printf("Starting VM, please wait ...\n"); 
//waiting for the end of the operation. Abnormal termination- progress == nullptr ! 
rc = progress->WaitForCompletion(-1); 
// unlocking the machine 
rc = session->UnlockMachine(); 
if (!SUCCEEDED(rc)) 
{ 
printf("Error restore state machine!\n"); 
break; 
}

Can you help me, how to fix call method error “ RestoreSnapshot - E_NOTIMPL Not implemented” or how to restore a snapshot of the system correctly? Thank you.

You don't seem to be testing the return value of FindSnapshot()?

mpack wrote:You don't seem to be testing the return value of FindSnapshot()?

Return value of FindSnapshot() is S_OK

Application build order:
1) Compiling VirtualBox.idl and getting dlldata.c, VirtualBox_h.h, VirtualBox_i.c, VirtualBox_p.c files to a console project
2) Creating a source code file in a console project
3) Compiling and running a console project.
Is that right?
Just in case - Visual Studio 2017 project: https://drive.google.com/open?id=1zcb3v ... mSUJrj_DdL

I created a simple C # application, and got the exact same error there. What's the matter? This is mistake API ? I even changed the OS (virtual) many times.

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static void Main(string[] args)
        {
            VirtualBox.VirtualBox virtualBox = new VirtualBox.VirtualBox();
            IMachine vmMachine = virtualBox.FindMachine("Win7x64VB");
            Session session = new Session();
            vmMachine.LockMachine(session, LockType.LockType_Shared);
            IConsole console = session.Console;

            // Restore snapshot
            ISnapshot snapShot = vmMachine.FindSnapshot("Win7_snapshot1");

            IProgress snapShotProgress = vmMachine.RestoreSnapshot(snapShot);
            snapShotProgress.WaitForCompletion(300000);

            // unlock before launch VMProcess
            session.UnlockMachine();

            IProgress launchVmProgess = vmMachine.LaunchVMProcess(session, "gui", "None");

            launchVmProgess.WaitForCompletion(300000);
        }

Screenshot exception: http://i-fotki.info/25/bfce220c3c452dc9 ... 9.png.html

Hi gyes!
I found a solution of the problem. Snapshot should be restored with the system that is current for the session. So code will be as follows:

Code: Select all

	
HRESULT rc = machine->LockMachine(session, LockType::LockType_Shared);
rc = machine->FindSnapshot(snapshotUUID, &snapshot);
IMachine* currentMachine(nullptr);
rc = session->get_Machine(&currentMachine);
rc = currentMachine->RestoreSnapshot(snapshot, &progress);
rc = progress->WaitForCompletion(300000);
rc = session->UnlockMachine();

It works with this code.

Thank you for the feedback and the solution!

I hope someone finds it useful in the future. Marking as [Solved].

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[Solved] Error restored snapshot vm

[Solved] Error restored snapshot vm

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