// install the fuctions that will be called from libcurlshim
private void InstallDelegates()
{
m_pDelWrite = new External.CURL_WRITE_DELEGATE(WriteDelegate);
m_pDelRead = new External.CURL_READ_DELEGATE(ReadDelegate);
m_pDelProg = new External.CURL_PROGRESS_DELEGATE(ProgressDelegate);
m_pDelDebug = new External.CURL_DEBUG_DELEGATE(DebugDelegate);
m_pDelHeader = new External.CURL_HEADER_DELEGATE(HeaderDelegate);
m_pDelSSLCtx = new External.CURL_SSL_CTX_DELEGATE(SSLCtxDelegate);
m_pDelIoctl = new External.CURL_IOCTL_DELEGATE(IoctlDelegate);
m_hThis = GCHandle.Alloc(this);
m_ptrThis = (IntPtr)m_hThis;
External.curl_shim_install_delegates(m_pCURL, m_ptrThis,
m_pDelWrite, m_pDelRead, m_pDelProg,
m_pDelDebug, m_pDelHeader, m_pDelSSLCtx, m_pDelIoctl);
}