QueryChangedDiskAreas crashes for one VM

Hi !

I'm using c++/clr so I can do the Soap communication like done in the c# examples of the sdk and also can use the functions from the VDDK. I initialize the vixdisklib with Version number 5.0. I communicate directly with the esxi host which is 5.1. I'm using the VDDK 5.1.1.

I have the situation where QueryChangedDiskAreas crashes with a SoapException. No idea why, but it works for all my other vms. There is nothing Special I can think of - besides even if there was, that function should probably return a nice error instead of crashing my application.

The error message is this:

An unhandled exception of type 'System.Web.Services.Protocols.SoapException' occurred in System.Web.Services.dll

Additional information: Error caused by file /vmfs/volumes/51e943ed-ce941e40-4ad9-0040d0c00047/freeDos/freeDos.vmdk

It's a freeDos vm, so I have a small vm for testing.

Any ideas what could cause this or how I could work around it?

I'm not sure what other Information could be helpful for you. Maybe the order in which I do things, because I'm not really sure it is correct:

SoapConnect

vmConfigInfo => check if cbt is on, if not turn it on

VixDiskLib_InitEx(5, 0, &lognormal, &logwarn, &logpanic, NULL, NULL);

VixDiskLib_PrepareForAccess(&connectParams, "MyApp"); // I set vmxSpec to moref=[vmname]. Is this correct? I found locations where they put moid=[some nnumber] there.

vixError = VixDiskLib_ConnectEx(&connectParams, TRUE, NULL, NULL, &srcConnection);  // I set vmxSpec to 0 here. If I let the moref=[vmname] in here, Open later on fails.

createSnapshot

VirtualMachineConfigInfo ^ vmSnapConfigInfo = (VirtualMachineConfigInfo ^)svcutil->GetDynamicProperty(snapmor, "config");

extract the devicekeys of the devices I want to backup from the info above

VixDiskLib_Open(srcConnection, snapshotdisk->filename, VIXDISKLIB_FLAG_OPEN_READ_ONLY, &diskHandle);

VixDiskLib_GetInfo(diskHandle, &info);

svc->Service->QueryChangedDiskAreas(vmmor, snapmor, snapshotdisk->devicekey, position, changeidprev);  // changeidprev is "*" in my case; ==> here it crashes

// theoretically continue like this:

VixDiskLib_Close(diskHandle);

removeSnapshot(snapmor);

VixDiskLib_Disconnect(srcConnection);

VixDiskLib_EndAccess(&connectParams, "MyApp");     // again, vmxSpec is set to moref=[vmname]

VixDiskLib_Cleanup(&connectParams, &numcleanedup, &numremaining);

VixDiskLib_Exit();

SoapDisconnect

Thx

   intripoon