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 SDKfor 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.
备注
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