URLOpenStream Function

Creates a push type stream object from a URL.

Syntax

HRESULT URLOpenStream(
    LPUNKNOWN pCaller,
    LPCSTR szURL,
    DWORD dwReserved,
    LPBINDSTATUSCALLBACK lpfnCB
);

Parameters

pCaller

Address of the controlling IUnknown interface of the calling ActiveX® component (if the caller is an ActiveX component). If the caller is not an ActiveX component, this value can be set to NULL. Otherwise, the caller is a COM object that is contained in another component (such as an ActiveX control within the context of an HTML page). This parameter represents the outermost IUnknown of the calling component. The function attempts the download within the context of the ActiveX client framework and allows the caller's container to receive callbacks on the progress of the download.

szURL

String containing the URL to be converted to a stream object. Cannot be NULL.

dwReserved

Reserved for future use. Must be zero.

lpfnCB

Address of the caller's IBindStatusCallback interface, on which URLOpenStream calls IBindStatusCallback::OnDataAvailable when data arrives from the Internet. IBindStatusCallback::OnDataAvailable can return E_ABORT to abort the download.

Remarks

The data is downloaded from the Internet as fast as possible. When data is available, it is pushed at the client through a notification callback.

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