在winhttp.dll中的访问冲突

我试图在c++中使用WinHTTP执行HTTP GET，但在解析名称后的某个时刻崩溃(在状态回调函数中获得WINHTTP_CALLBACK_STATUS_NAME_RESOLVED后)。我在winhttp.dll中遇到访问冲突。调用栈是:

winhttp.dll!HTTP_USER_REQUEST::_IndicateSocketAddress() + 0x221ed bytes
HTTP_USER_REQUEST:: ondnsnamerresolved () + 0x24 bytes
WEBIO_REQUEST::_OnInformation() + 0x1c0c字节_WaIndicateHttpRequestInformation@16() + 0x15a字节_WaHttpInformationConnection@16() + 0x7a字节
_WapTcpDnsQueryCompletionRoutine@12() + 0x2f bytes
_WapCallDnsQueryCompletion@12() + 0x6d字节_WaDnsResolutionWorker@8() + 0x157字节ntdll.dll!_TppSimplepExecuteCallback@8() + 0x7b字节
ntdll.dll!TppWorkerThread@4() + 0x5a4 bytes
@BaseThreadInitThunk@12() + 0x12字节
__RtlUserThreadStart@8() + 0x27字节
ntdll.dll!__RtlUserThreadStart@8() + 0x1b bytes

相关代码为:

enum OnlineState
{
    OnlineState_Idle,
    OnlineState_Registering
};
static OnlineState g_OnlineState = OnlineState_Idle;
HINTERNET g_Request = 0;
HINTERNET g_Connection = 0;
unsigned char g_HTTPBuffer[1024];
void HTTPRequestComplete()
{
    if(g_Request != 0)
    {
        WinHttpCloseHandle(g_Request);
        g_Request = 0;
    }
    if(g_Connection != 0)
    {
        WinHttpCloseHandle(g_Connection);
        g_Connection = 0;
    }
    g_OnlineState = OnlineState_Idle;
}
void HTTPAsyncCallback(HINTERNET hInternet, DWORD_PTR dwContext, DWORD dwInternetStatus, LPVOID lpvStatusInformation, DWORD dwStatusInformationLength)
{
    switch(dwInternetStatus)
    {
        case WINHTTP_CALLBACK_STATUS_SENDREQUEST_COMPLETE:
        {
            // Get the response
            if (!WinHttpReceiveResponse(g_Request, 0))
            {
            // Failed to get the response
                HTTPRequestComplete();
                return;
            }
        }
        break;
        case WINHTTP_CALLBACK_STATUS_HEADERS_AVAILABLE:
        {
            DWORD statusCode = 0;
            DWORD statusCodeSize = sizeof(DWORD);
            if (!WinHttpQueryHeaders(g_Request,
                           WINHTTP_QUERY_STATUS_CODE |     WINHTTP_QUERY_FLAG_NUMBER,
                           WINHTTP_HEADER_NAME_BY_INDEX,
                           &statusCode,
                           &statusCodeSize,
                           WINHTTP_NO_HEADER_INDEX))
            {
                // Failed to query headers
                HTTPRequestComplete();
                return;
            }
            if (HTTP_STATUS_OK != statusCode)
            {
                // Error status
                HTTPRequestComplete();
                return;
            }
            if (!WinHttpReadData(g_Request,
                           g_HTTPBuffer,
                           sizeof(g_HTTPBuffer),
                           0))
            {
                // Error reading data
                HTTPRequestComplete();
                return;
            }
        }
        break;
        case WINHTTP_CALLBACK_STATUS_READ_COMPLETE:
        {
            if (dwStatusInformationLength > 0)
            {
                // Store the data
                // Read the next data
                if (!WinHttpReadData(g_Request,
                                     g_HTTPBuffer, 
                                         sizeof(g_HTTPBuffer),
                                     0))
                {
                    // Error
                HTTPRequestComplete();
                return;
            }
        }
        else
        {
            // Request completed OK
            HTTPRequestComplete();
        }
    }
    break;
    default:
        break;
    }
}
// Online functionality
void Online_UpdateServer()
{
    switch(g_OnlineState)
    {
    case OnlineState_Idle:
        {
            // Get our local ip address by connecting a local socket to a web address and reading the socket name
            // Look up the address to connect to
            addrinfo hints;
            addrinfo* res = 0;
            memset(&hints, 0, sizeof hints);
            hints.ai_family = AF_UNSPEC;
            hints.ai_socktype = SOCK_DGRAM;
            getaddrinfo("www.google.com", "80", &hints, &res);
            // Create the socket
            int tempSocket = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
            unsigned int localAddress = 0;
            if (tempSocket >= 0)
            {
                // Connect the socket
                connect(tempSocket, res->ai_addr, res->ai_addrlen);
                // Get the socket name (our local ip address)
                sockaddr_in localName;
                memset(&localName, 0, sizeof(localName));
                int bufferSize = sizeof(localName);
                if(getsockname(tempSocket, (sockaddr*)&localName, &bufferSize) == 0)
                {
                    // Get the IP address
                    localAddress = localName.sin_addr.S_un.S_addr;
                }
                closesocket(tempSocket);
            }
            // Connect
            g_Connection = WinHttpConnect(g_Internet, L"www.google.com", INTERNET_DEFAULT_PORT, 0);
            // Open the request
            std::wstringstream urlString;
            urlString << L"/";
            std::wstring tempString = urlString.str();
            const wchar_t* wurlString = tempString.c_str();
            g_Request = WinHttpOpenRequest(g_Connection, 0, wurlString, 0, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, 0);
            // Install the status callback function.
            if(WINHTTP_INVALID_STATUS_CALLBACK == WinHttpSetStatusCallback(g_Request, (WINHTTP_STATUS_CALLBACK)HTTPAsyncCallback, WINHTTP_CALLBACK_FLAG_ALL_NOTIFICATIONS, NULL))
            {
                OutputDebugString(L"Error");
            }
            // Send the request
            if(!WinHttpSendRequest(g_Request, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0))
            {
                OutputDebugString(L"Error");
            }
            // Log that we're registering
            g_OnlineState = OnlineState_Registering;
        }
        break;
    case OnlineState_Registering:
        {
            // Don't do anything, as we're currently registering
        }
        break;
    default:
        break;
    }
}

g_Internet是这样初始化的:

// Initialise HTTP
g_Internet = WinHttpOpen(L"Boomba", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, WINHTTP_FLAG_ASYNC);

据我所知，我正在初始化和正确使用WinHTTP，一切似乎都没有错误。回调被调用两次，第一次与WINHTTP_CALLBACK_STATUS_RESOLVING_NAME，然后与WINHTTP_CALLBACK_STATUS_NAME_RESOLVED，然后我得到一个访问冲突:

0xC0000005:访问冲突读取位置0x00000014

位置变化，到各种各样的事情，所以我认为它看起来可能是一个线程问题，但我不确定什么可能是问题。什么好主意吗?(我用的是64位的Windows 7)