Convert System::UInt64 to unsigned long

  • Thread starter Thread starter Mike Miller
  • Start date Start date
M

Mike Miller

What is the best way to convert a managed unsigned int64 to an
unsigned long? Basically I need to do the following:

System::UInt64 managedInt = 10;
unsigned long unmanagedInt;
unmanagedInt = managedInt;

Also it would be nice to know how to do this:

System::UInt64 managedInt;
unsigned long unmanagedInt = 10;
managedInt = unmanagedInt;

Thanks for your help.
Mike
 
You do realize that a 64 bit unsigned integer like a System::UInt64 does
_not_ fir in to a 32 bit unsigned integer such as a long?

If you are sure it won't overflow, just cast:

unsigned long unmanagedInt = static_cast<unsigned long>(managedInt);

If you want to use the same 64 bit type, just use:

unsigned long long unmangedInt = managedInt;

In physical reality there is no different between the System:: integer types
and the normal integer types in C++. Only when you take the address of them,
the type of pointer you get is different (in the 7.0 and 7.1 versions of
Visual C++, in the Whidbey version they will be identical in all respects).

Ronald Laeremans
Visual C++ team
 
Ronald,
Thanks for taking the time to answer my question. I tried the
following:

System::UInt32 managedInt = 10;
unsigned long unmanagedInt = static_cast<unsigned long>(managedInt);

When I get following compiler error:
error C2440: 'static_cast' : cannot convert from 'unsigned int __gc *'
to 'unsigned long'

I can't seem to convert between managed integer types and unmanaged
integer types.

Any help would be appreciated.
Thanks,
Mike
 
Figured it out - just being stupid on a Monday morning.
Mike
-----Original Message-----
Ronald,
Thanks for taking the time to answer my question. I tried the
following:

System::UInt32 managedInt = 10;
unsigned long unmanagedInt = static_cast<unsigned long> (managedInt);

When I get following compiler error:
error C2440: 'static_cast' : cannot convert from 'unsigned int __gc *'
to 'unsigned long'

I can't seem to convert between managed integer types and unmanaged
integer types.

Any help would be appreciated.
Thanks,
Mike






"Ronald Laeremans [MSFT]" <[email protected]>
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