CInternetSession::OnStatusCallback

This member function is called by the framework to update the status when status callback is enabled and an operation is pending.

virtual void OnStatusCallback( 
   DWORD_PTR dwContext, 
   DWORD dwInternetStatus, 
   LPVOID lpvStatusInformation, 
   DWORD dwStatusInformationLength  
);

Parameters

  • dwContext
    The context value supplied by the application.

  • dwInternetStatus
    A status code which indicates why the callback is being made. See Remarks for a table of possible values.

  • lpvStatusInformation
    A pointer to a buffer containing information pertinent to this callback.

  • dwStatusInformationLength
    The size of lpvStatusInformation.

Remarks

You must first call EnableStatusCallback to take advantage of status callback.

The dwInternetStatus parameter indicates the operation being performed and determines what the contents of lpvStatusInformation will be. dwStatusInformationLength indicates the length of the data included in lpvStatusInformation. The following status values for dwInternetStatus are defined as follows:

Value

Meaning

INTERNET_STATUS_RESOLVING_NAME

Looking up the IP address of the name contained in lpvStatusInformation.

INTERNET_STATUS_NAME_RESOLVED

Successfully found the IP address of the name contained in lpvStatusInformation.

INTERNET_STATUS_CONNECTING_TO_SERVER

Connecting to the socket address (SOCKADDR) pointed to by lpvStatusInformation.

INTERNET_STATUS_CONNECTED_TO_SERVER

Successfully connected to the socket address (SOCKADDR) pointed to by lpvStatusInformation.

INTERNET_STATUS_SENDING_REQUEST

Sending the information request to the server. The lpvStatusInformation parameter is NULL.

INTERNET_STATUS_ REQUEST_SENT

Successfully sent the information request to the server. The lpvStatusInformation parameter is NULL.

INTERNET_STATUS_RECEIVING_RESPONSE

Waiting for the server to respond to a request. The lpvStatusInformation parameter is NULL.

INTERNET_STATUS_RESPONSE_RECEIVED

Successfully received a response from the server. The lpvStatusInformation parameter is NULL.

INTERNET_STATUS_CLOSING_CONNECTION

Closing the connection to the server. The lpvStatusInformation parameter is NULL.

INTERNET_STATUS_CONNECTION_CLOSED

Successfully closed the connection to the server. The lpvStatusInformation parameter is NULL.

INTERNET_STATUS_HANDLE_CREATED

Used by the Win32 API function InternetConnect to indicate that it has created the new handle. This lets the application call the Win32 function InternetCloseHandle from another thread if the connect is taking too long. See the Windows SDK for more information about these functions.

INTERNET_STATUS_HANDLE_CLOSING

Successfully terminated this handle value.

Override this member function to require some action before a status callback routine is performed.

Note

Status callbacks need thread-state protection. If you are using MFC in a shared library, add the following line to the beginning of your override:

AFX_MANAGE_STATE(AfxGetAppModuleState());

For more information about asynchronous operations, see the article Internet First Steps: WinInet.

Requirements

Header: afxinet.h

See Also

Reference

CInternetSession Class

Hierarchy Chart

CInternetSession::EnableStatusCallback

CInternetSession::GetContext