[vbox-dev] A question about virtualbox sdk api

[magicdmer at gmail.com]

Hi!
    I'm new to Virtualbox Development. I have a few problems when i use virtualbox sdk.
     
IMedium* pIMedium = NULL;

rc = IMediumAttachmentVector[j]->get_Medium(&pIMedium);

if(SUCCEEDED(rc) && pIMedium)

{

        IMedium* BaseMedium = NULL;

        rc = pIMedium->get_Base(&BaseMedium);

        if(SUCCEEDED(rc) && BaseMedium)

        {

                BSTR bstrName;

                BaseMedium->get_Name(&bstrName);

                LONG64 aLogicalSize = 0;

                if(Device.Type == DeviceType_HardDisk)

                {

                        rc = pIMedium->get_LogicalSize(&aLogicalSize);       //here can't get the real size, always zero
                }
                else
                {

                        rc = pIMedium->get_Size(&aLogicalSize);

                }

                SAFE_RELEASE(BaseMedium);

        }

        SAFE_RELEASE(pIMedium);

}

The API "get_LogicalSize" can't get the real size ,it is always zero and return value is ok. but when i open virtualbox (virtualbox.exe) , the function Execute successfully and get the real size. Does it need some preconditions ?
 
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