Ilian Iliev has already mentioned why what you are suggesting can be problematic; it is technically possible to have more than one VM in inventory with the same name. I don't remember if it's a requirement that snapshot names be unique within given VM, but I wouldn't be surprised to find out that it is not.
If you feel comfortable that your organization's policies guarantee unique names, then what you are asking can of course be done. You probably would want to build some exception handling logic into this workflow so that if a search for a VM or snapshot by name results in more than one of each being returned, it returns some kind of friendly error message to the user and doesn't take any additional action. They can then bring it to your attention.
Maybe something like this? This code will accept a VM name as a string and a snapshot name as a string, and then search inventory for them. As long as there is exactly 1 VM with that name and that VM has exactly 1 snapshot with that name, it will return the VC:VirtualMachineSnapshot object, which you could then pass into any other workflow you like that accepts that as an input.
var vmName = 'MyVM';
var snapName = 'MyVM_snapshot';
var xpath = "xpath:name='" + vmName + "'";
var vms = VcPlugin.getAllVirtualMachines(null, xpath);
if(vms.length === 0) { throw "No VMs found with that name."; }
else if (vms.length > 1) { throw "More than one VM found with that name."; }
var vm = vms[0];
System.log("Found VM named '" + vm.name + "'");
var allSnapsOfVm = System.getModule("com.vmware.library.vc.vm.snapshot").getAllSnapshotsOfVM(vm);
if (allSnapsOfVm.length === 0) { throw "VM '" + vm.name + "' does not have any snapshots outstanding."; }
var countOfSnapsWithSameName = 0;
var snapIndexToReturn;
for (var k in allSnapsOfVm) {
if (allSnapsOfVm[k].name === snapName) {
countOfSnapsWithSameName++;
snapIndexToReturn = k;
}
}
if (countOfSnapsWithSameName > 1) {
throw "More than one snapshot with that name found on VM '" + vm.name + "'";
}
else if (countOfSnapsWithSameName === 0) {
throw "No snapshots with name '" + snapName + "' found on VM '" + vm.name + "'";
}
else {
return allSnapsOfVm[snapIndexToReturn];
}
