How to get value of IntPtr

31 Oct 2006 9:41 PM

Notre Poubelle

Hello,

I'm using the IEnumMoniker.Next method, based on an IEnumMoniker reference
I've obtained by looking up values in the running object table. The third
parameter to IEnumMoniker.Next is an IntPtr. It's supposed to return the
number of items actually returned, based on the number requested as specified
by the first parameter. My question is, how do I properly call
IEnumMoniker.Next and specify the IntPtr final parameter such that its value
is set? So far, everytime I try to get the value of the IntPtr variable it
is always 0 after the call.

Thanks,
Notre

1 Nov 2006 2:55 AM

Walter Wang [MSFT]

Hi Notre,

You can use Marshal.AllocHGlobal to allocate the memory for the ULONG as
required by IEnumMoniker::Next, then use Marshal.ReadInt32 to read its
value.

    IRunningObjectTable prot;
    IEnumMoniker pMonkEnum;
    GetRunningObjectTable(0,out prot);
    prot.EnumRunning(out pMonkEnum);
    pMonkEnum.Reset();          // Churn through enumeration.
    IntPtr fetched = Marshal.AllocHGlobal(4);
    IMoniker []pmon = new IMoniker[1];
    while(pMonkEnum.Next(1, pmon, fetched) == 0)
    {
        int iFetched = Marshal.ReadInt32(fetched);
        IBindCtx pCtx;
        CreateBindCtx(0, out pCtx);
        string str;
        pmon[0].GetDisplayName(pCtx,null,out str);
    }
    Marshal.FreeHGlobal(fetched);

Sincerely,
Walter Wang (waw***@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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1 Nov 2006 5:09 PM

Notre Poubelle

Perfect, thanks Walter!