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public delegate void InternetSetStatusCallbackHandler(IntPtr h_Internet, int dwContext, int dwInternetStatus, IntPtr lpStatusInfo, int dwStatusInfoLen);
[DllImport("wininet.dll", SetLastError = true)]
public static extern long InternetSetStatusCallback(IntPtr hInternet, InternetSetStatusCallbackHandler callback);
// 调用
WinInet.InternetSetStatusCallback(m_hInternet, new WinInet.InternetSetStatusCallbackHandler(InternetOpenCallback));
private void InternetOpenCallback(IntPtr h_Internet, int dwContext, int dwInternetStatus, IntPtr lpStatusInfo, int dwStatusInfoLen) {
}