在Virtual Box中恢复虚拟机快照时出错

Posted 2021-04-19

我为我的项目使用VirtualBox和Virtual Box API Microsoft Com C ++。它是VirtualBox 6.0.6软件开发工具包（SDK）和VirtualBox 6.0.6平台包。 我有个问题。我想恢复早期创建的快照系统，但程序显示错误。 我的代码有评论：

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
", 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 ...
"); 
//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!
"); 
break; 
}

另外，我创建了一个简单的C＃应用​​程序，并在那里得到了完全相同的错误。怎么了？这是错误的API？我甚至多次更改操作系统（虚拟）：

  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);
    }

你能帮帮我，如何修复呼叫方法错误“RestoreSnapshot - E_NOTIMPL Not implemented”或如何正确恢复系统快照？谢谢。

P.S。：我在官方论坛上问过这个问题，但没有人帮助我。

答案

我找到了问题的解决方案。应使用当前用于会话的系统恢复快照。所以代码如下：

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();

它适用于此代码。