Allows an application to check if a connection to the Internet can be established.
Syntax
BOOL InternetCheckConnection( IN LPCTSTR lpszUrl, IN DWORD dwFlags, IN DWORD dwReserved );The actual syntax of this function varies between its ANSI and Unicode implementations. For more information, see Win32 Internet Functions Syntax.
Parameters
- lpszUrl
- Address of a string containing the Uniform Resource Locator (URL) to use to check the connection. This value can be set to NULL.
- dwFlags
- Unsigned long integer value containing the flag values. FLAG_ICC_FORCE_CONNECTION is the only flag that is currently available. If this flag is set, it forces a connection. A sockets connection is attempted in the following order:
- If lpszUrl is non-NULL, the host value is extracted from it and used to ping that specific host.
- If lpszUrl is NULL and there is an entry in WinInet's internal server database for the nearest sever, the host value is extracted from the entry and used to ping that server.
- dwReserved
- Reserved. Must be set to zero.
Return Value
Returns TRUE if a connection is made successfully, or FALSE otherwise. Use GetLastError to retrieve the error code. ERROR_NOT_CONNECTED is returned by GetLastError if a connection cannot be made or if the sockets database is unconditionally offline.
Function Information
Windows NT Use version 4.0. Implemented as ANSI and Unicode functions. Windows Use Windows 95 and later. Implemented as ANSI and Unicode functions. Header Wininet.h Import library Wininet.lib Minimum availability Internet Explorer 3.0 (ANSI only), 5 (ANSI and Unicode)
See Also
Microsoft Win32 Internet Functions Overview, Enabling Internet Functionality, Microsoft Win32 Internet Functions Reference, General Win32 Internet Functions