watch variable??

i have used VS2005 to do programing ,but i find a problem while i'was looking into a variable(named hr ) with debugging.

such as the codes:

Code:

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HRESULT DXUTChangeDevice( DXUTDeviceSettings* pNewDeviceSettings, IDirect3DDevice9* pd3dDeviceFromApp, bool bForceRecreate )
{
    HRESULT hr;//problem,can't watch variable
    DXUTDeviceSettings* pOldDeviceSettings = GetDXUTStat().GetCurrentDeviceSettings();

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my question is why can't vs 2005 debuger watch the variable "hr" ,seem to me that think any complile optimization

Are you debugging in release mode? If so, then it's a common problem and the only solution is to look at the asm and try to track the register the value is stored in (or just print some debug messages).

you mean i'm should be debug mode,watching variable in asm ,is not my purpose!

If you debug in debug mode, you'll be able to see the values of each and every variable. Optimization sometimes removes variables.

yes, thanks for your reply but can't solve this problem yet

Well, are you debugging in debug mode or not?

Where are you trying to watch the variable from? It's a variable local to that function, so I imagine that watching it might not work too well if that function hasn't been called yet, for example.

no,i'm watch variable inside that function, not out of scope.

Well then the variable is probably being optimised out of existence. Disable as many optimisations as you can and see what happens.

Third time's a charm:
Are you debugging in debug mode or release mode?