Solving ArithmeticOverflow calling AddrOfPinnedObject

Question

I am using a lib to preview and capture snapshots from capture cards.

The lib: http://www.codeproject.com/Articles/34663/DirectShow-Examples-for-Using-SampleGrabber-for-Gr

It was built for .net 2.0 and everything works perfectly when those classes and controls are called from .net 2.0 or 3.5 projects.

When I add the reference to it from a .net 4.0 project, I am getting a fantastic exception.

Arithmetic operation resulted in an overflow.

when trying to:

GCHandle handle = GCHandle.Alloc(this.savedArray, GCHandleType.Pinned);
int scan0 = (int)handle.AddrOfPinnedObject();

I would happily change my app to .net 2.0 but I need it to be in .net 4.0 to reference some other libs.

I have no idea how to solve this. I have tried to compile those libs in .net 4.0 and succeeded, but when executing that piece of code, same problem. Could it be a problem in .net 4.0?

I am lost. It would be perfect if you could provide some guidance in this matter.

Check this out http://stackoverflow.com/questions/4756542/arithmetic-operation-resulted-in-an-overflow-adding-integers — Pavenhimself, Dec 30 '14 at 13:11
What does the Stack Trace show? Does it have any Inner Exception? — Andrew, Dec 30 '14 at 13:13

score 3 · Accepted Answer · answered Dec 30 '14 at 13:14

3

An int is a 32-bit integer. If you are on a 64 bit machine, addresses aren't 32 bit, but 64 bits.

Use Int64 (long) instead to match the processor's address length:

long scan0 = (long)handle.AddrOfPinnedObject();

Or, even better, call ToInt64:

long scan0 = handle.AddrOfPinnedObject().ToInt64();

answered Dec 30 '14 at 13:14

Patrick Hofman

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Wouldn't it be more correct to use IntPtr? Then it should work for either architecture. – RenniePet Dec 30 '14 at 13:17
1

@RenniePet: `handle` *is* an `IntPtr`. – Patrick Hofman Dec 30 '14 at 13:17
Setting the build 'Platform target' to 'x86' solved to problem as well. But it seems more correct to update the variable to long. Thanks. – hpinhal Dec 30 '14 at 14:45
@user3149304: That is true because it runs as like it does on a 32 bit platform. – Patrick Hofman Dec 30 '14 at 14:45

Solving ArithmeticOverflow calling AddrOfPinnedObject

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