🚀 go-pugleaf

Cheers bob, i had looked at the MSDN references that you so kindly posted 
below and they scare the s&%t out of me - was naively hoping that someone 
would tell me that it was all that complicated - but alas.

I actual ended up doing it as remy suggested by processing the users 
selection on the fly and then disallowing the OK button and setting the 
status text

Thanks again - might brave it when i'm not so busy.

Mike

"Bob Gonder" <notbg@notmindspring.invalid> wrote in message 
news:6f0ks2166gv2qvl1v7oq0kofrmitcu4mio@4ax.com...
> Mike Collins wrote:
>
>>Hi all, can anyone point me in the right direction with this -not sure if 
>>it
>>is possible though.
>
> Sounds COMplicated but doable.
> (I haven't done it, just reading the docs...)
>
>>I 'm using the SHBrowseForFolder api to display a browser dialog. 
>>However,
>>i want to control what is displayed, and thus selected within this dialog.
>>I want to limit the users display to only removale drives, CD / DVD drives
>>and folders within these drives.  I've coded a custome callback for the
>>browser but i'm not sure what messages to look for and how to process 
>>then.
>
> The remarks section here
> http://msdn2.microsoft.com/en-us/library/ms647664.aspx
> mentions  Custom Filtering (with 6 steps)
>
> Step3
> You will be catching BFFM_IUNKNOWN message in your callback
> http://msdn2.microsoft.com/en-us/library/ms649522.aspx
>
>    case BFFM_IUNKNOWN:
> IFolderFilterSite* FFS;
> ((IUnknown*)lParam)->QueryInterface( Unsure, &FFS );
>
> Step 5
> Then making your COM filter interface available to the dialog.
> http://msdn2.microsoft.com/en-us/library/ms645491.aspx
>
> FFS->SetFilter( MyIUnknownCOMInterfaceThatHasAnIFolderFilter);
> Step 6
> FFS->Release();
>
> Step 4
> You would then need a COM Interface
> (MyIUnknownCOMInterfaceThatHasAnIFolderFilter) that returns a pointer
> to an IFolderFilter which implements your 2 filtering procs.
> http://msdn2.microsoft.com/en-us/library/ms645494.aspx
>
> In particular your  IFolderFilter::ShouldShow() method returns S_OK to
> show and S_FALSE to hide.
> http://msdn2.microsoft.com/en-us/library/ms645496.aspx
>
> Apparently after all that, the dialog automatically calls your COM
> filters for each item.
>
> COM interfaces are currently beyond my knowledge base.
> Perhaps you have ventured there?
>
>