Straight to the IntPtr -

try if(IntPtr.ToInt32() 0)

Hi,
I'm trying to convert the following line to c# from VB6
>
If hrRapiInit >= 0 Then 'SUCCEEDED
>
where hrRapiInit is declared as a Long.
>
In c#, hrRapiInit must be declared as an IntPtr to fit in with the dll
function i have imported, but obviously, the line
>
if (hrRapiInit >= IntPtr.Zero) //SUCCEEDED
>
returns an error.
>
What is the equivalent c# test to see if an IntPtr is greater than or
equal to 'zero'? Is there such a test?
>
Many thanks in advance,
James Randle.
>

Hi,
>
You should ALWAYS compare it to IntPtr.Zero . so instead you should do
if ( intPtr.Zero != hrRapiInit )
>
or
if ( IntPtr.Zero.Equals( hrRapiInit )
>
>
--
--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
>
>
>
"pigeonrandle" <pigeonrandle@hotmail.comwrote in message
news:1153825570.440315.68770@p79g2000cwp.googlegro ups.com...

James,
Remember that IntPtr.ToInt32 is "valid" on Win32 platforms.
>
http://msdn2.microsoft.com/en-us/lib...r.toint32.aspx
>
For Win64 platforms its probably safer to use IntPtr.ToInt64 (as it sounds
like ToInt32 with throw an exception).
>
http://msdn2.microsoft.com/en-us/lib...r.toint64.aspx
>
>
--
Hope this helps
Jay B. Harlow [MVP - Outlook]
.NET Application Architect, Enthusiast, & Evangelist
T.S. Bradley - http://www.tsbradley.net
>
>
"pigeonrandle" <pigeonrandle@hotmail.comwrote in message
news:1153825570.440315.68770@p79g2000cwp.googlegro ups.com...
| Hi,
| I'm trying to convert the following line to c# from VB6
|
| If hrRapiInit >= 0 Then 'SUCCEEDED
|
| where hrRapiInit is declared as a Long.
|
| In c#, hrRapiInit must be declared as an IntPtr to fit in with the dll
| function i have imported, but obviously, the line
|
| if (hrRapiInit >= IntPtr.Zero) //SUCCEEDED
|
| returns an error.
|
| What is the equivalent c# test to see if an IntPtr is greater than or
| equal to 'zero'? Is there such a test?
|
| Many thanks in advance,
| James Randle.
|

James,
Remember that IntPtr.ToInt32 is "valid" on Win32 platforms.
>
http://msdn2.microsoft.com/en-us/lib...r.toint32.aspx
>
For Win64 platforms its probably safer to use IntPtr.ToInt64 (as it sounds
like ToInt32 with throw an exception).
>
http://msdn2.microsoft.com/en-us/lib...r.toint64.aspx
>
>
--
Hope this helps
Jay B. Harlow [MVP - Outlook]
.NET Application Architect, Enthusiast, & Evangelist
T.S. Bradley - http://www.tsbradley.net
>
>
"pigeonrandle" <pigeonrandle@hotmail.comwrote in message
news:1153825570.440315.68770@p79g2000cwp.googlegro ups.com...
| Hi,
| I'm trying to convert the following line to c# from VB6
|
| If hrRapiInit >= 0 Then 'SUCCEEDED
|
| where hrRapiInit is declared as a Long.
|
| In c#, hrRapiInit must be declared as an IntPtr to fit in with the dll
| function i have imported, but obviously, the line
|
| if (hrRapiInit >= IntPtr.Zero) //SUCCEEDED
|
| returns an error.
|
| What is the equivalent c# test to see if an IntPtr is greater than or
| equal to 'zero'? Is there such a test?
|
| Many thanks in advance,
| James Randle.
|

Ignacio,
>
Thankyou for replying. In the context i am using it in, i am looking to
test >= 0, not just = or !=. Is there a way i can accomplish this using
these techniques?
>
I am using the function CeRapiInitEx(RAPIINIT ra), which uses the
structure
>
typedef struct _RAPIINIT {
DWORD cbSize;
HANDLE heRapiInit;
HRESULT hrRapiInit;
} RAPIINIT;
>
and on pinvoke.net, the supposed declaration is...
>
[StructLayout(LayoutKind.Explicit)]
public struct RAPIINIT
{
[FieldOffset(0)] public int cbsize;
[FieldOffset(4)] public System.IntPtr heRapiInit;
[FieldOffset(8)] public System.IntPtr hrRapiInit;
};
>
As you can see, an IntPtr has been used for hrRapiInit, but the test in
the SDK says you must test for >=0.
>
Is the c# struct incorrect? Should i be passing an int as a ref instead
of the second IntPtr?
>
Cheers,
James Randle
>
>
Ignacio Machin ( .NET/ C# MVP ) wrote:>

Your structure is wrong. HRESULT is not a handle, it's an int. Try this:
>
[StructLayout(LayoutKind.Sequential)]
public struct RAPIINIT
{
public int cbsize;
public System.IntPtr heRapiInit;
public int hrRapiInit;
};
>
and modify your CeRapiInitEx to take a ref to the above structure, i.e.
something like:
int CeRapiInitEx(ref RAPIINIT ra)
>
/claes
>
"pigeonrandle" <pigeonrandle@hotmail.comwrote in message
news:1153833994.839000.4550@m79g2000cwm.googlegrou ps.com...