Access violation occurs in GetHttpConnection () method - c++

Question

You are creating a program to download files from the specified URL in VC ++ 2012.
Part to be downloaded as a DLL, we're calling from the main program.
In this case, when you run the GetHttpConnection () method, an access violation occurs.
We examined various, but did not know.
Please lend your wisdom.
main.exe
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hModule = LoadLibraryW(currentDirectory);
DLL_GetHttp = (FUNC_DLL_GetHttp)GetProcAddress(hModule, "GetHttp");
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CHttpConnection* pConnection = NULL;
CInternetSession session;
CHttpFile* pFile = NULL;
BYTE* pRecvBuf;
ULONG pnRecvSize;
ULONG lRet;
lRet = DLL_GetHttp(&pConnection, &session, &pFile, downloadFile, NULL, 0, &pRecvBuf, &pnRecvSize);
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http.dll
ULONG GetHttp(CHttpConnection** pConnection, CInternetSession* session, CHttpFile** pFile, LPCTSTR url, BYTE* pSendBuf, ULONG nSendSize, BYTE** pRecvBuf, ULONG* pnRecvSize)
{
*pRecvBuf = NULL;
*pnRecvSize = 0;
LONG nRet = 0;
DWORD dwServiceType;
CString strServer;
CString strObject;
INTERNET_PORT nPort;
CString strConnectUrl;
strConnectUrl = url;
AFX_MANAGE_STATE( AfxGetStaticModuleState() );
if (!AfxParseURL(url, dwServiceType, strServer, strObject, nPort))
{
// ASSERT(0);
return ERROR_PARAMETOR;
}
try
{
(*pConnection) = (*session).GetHttpConnection( // access error!!!!
strServer,
INTERNET_FLAG_RELOAD | INTERNET_FLAG_DONT_CACHE ,
nPort,
NULL,
NULL
);
DWORD dwFlags = INTERNET_FLAG_EXISTING_CONNECT | INTERNET_FLAG_RELOAD | INTERNET_FLAG_DONT_CACHE;
BOOL bSecure = strConnectUrl.MakeLower().Find(_T("https")) == 0;
if (bSecure)
{
dwFlags |= INTERNET_FLAG_SECURE;
}
*pFile = (*pConnection)->OpenRequest(
CHttpConnection::HTTP_VERB_POST,
strObject,
NULL,
1,
NULL,
_T("HTTP/1.1"),
dwFlags
);
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