Microsoft WinHTTP APIs?

Hi,

Does anyone know of a tutorial or any other info on using the MS
WinHTTP API through COM? The only site I can find is this one:

http://www.saunalahti.fi/janij/publications/delphi_developer.html

And that just tells you the guy wrote an article about it for a US
magazine that is no longer published. :(

I'm trying to download a jpeg as a stream and I'm having problems
with the IWinHttpRequest.responseStream method. MSDN says it should
return an IStream but the Delphi interface unit says it returns an
OleVariant.

I really don't want to have to use ICS or Indy. I'm trying to do this
without requiring an entire component library for one small function.

Thanks,
Dave.

Dave Murray
Glasgow, UK

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Dave Murray wrote:
> Hi,
>
> Does anyone know of a tutorial or any other info on using the MS
> WinHTTP API through COM? The only site I can find is this one:
>;
> http://www.saunalahti.fi/janij/publications/delphi_developer.html
>;
> And that just tells you the guy wrote an article about it for a US
> magazine that is no longer published. :(
>
> I'm trying to download a jpeg as a stream and I'm having problems
> with the IWinHttpRequest.responseStream method. MSDN says it should
> return an IStream but the Delphi interface unit says it returns an
> OleVariant.
>
> I really don't want to have to use ICS or Indy. I'm trying to do this
> without requiring an entire component library for one small function.
>
> Thanks,
> Dave.
>
> Dave Murray
> Glasgow, UK

http://msdn2.microsoft.com/en-us/library/aa384023.aspx

Says it returns a VARIANT.

A VARIANT can contain a pointer to an IUnknown interface. Think of
IUnknown as the ultimate base class in COM. From an IUnknown, you can
"cast" (QueryInterface()) it to the type you want: IStream.

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CubicleSoft President
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