How to query Windows Connection Manager in C++ for Internet connection parameters

Recently I had to create an HTTP connection from an application on Windows Mobile. After a while I figured out that the Connection Manager would be the way to go to determine connection parameters, like proxy settings etc.

You can then use e.g. WinInet functions for the actual data traffic. I will post an example for that later on. The following has been tested on Windows Mobile 5.0 and 6.0.

By the way, I will have to look for a way to get the formatting and syntax highlighting optimized.

int QueryConnMgr()
{
    HANDLE hConnMgr = NULL;
    BOOL bMgrAvailable = FALSE;
    hConnMgr = ConnMgrApiReadyEvent();

    if(!hConnMgr)
    {    // error handling
        return 0;
    }
    // wait for half a second to allow ConnMgr to get ready
    DWORD dwRC = WaitForSingleObject(hConnMgr, 500);
    if (WAIT_OBJECT_0 == dwRC)
    {
        bMgrAvailable = TRUE;
    }
    if(hConnMgr)
    {
        CloseHandle(hConnMgr);
    }
    if(!bMgrAvailable)
    {    // error handling
        return 0;
    }

    // create CONNMGR_CONNECTIONINFO structure required for URL mapping
    CONNMGR_CONNECTIONINFO ci = {0};
    PROXY_CONFIG pcProxy = {0};
    DWORD dwIndex = 0;
    DWORD dwStatus = 0;
    HRESULT hr = S_OK;
    HANDLE hOpen = NULL;
    HANDLE hConnection = NULL;
    ci.cbSize = sizeof(CONNMGR_CONNECTIONINFO);
    ci.dwParams = CONNMGR_PARAM_GUIDDESTNET;
    ci.dwFlags = CONNMGR_FLAG_PROXY_HTTP;
    ci.dwPriority = CONNMGR_PRIORITY_USERINTERACTIVE;
   
    // Attempt to map the URL to a target net
    hr = ConnMgrMapURL(TEXT("http://your.server.url"), &(ci.guidDestNet), &dwIndex);
    if (S_OK != hr)
    {    // error handling
        return 0;
    }
   
    // make synchronous connection attempt with timeout of 15 seconds
    hr = ConnMgrEstablishConnectionSync(&ci, &hConnection, 15000, &dwStatus);
    if (S_OK != hr)
    {    // error handling
        return 0;
    }
   
    if (dwStatus != CONNMGR_STATUS_CONNECTED)
    { // makes no sense to continue
        return 0;
    }
   
    // Get proxy information.
    hr = ConnMgrProviderMessage( hConnection, &IID_ConnPrv_IProxyExtension, NULL,
                                    0, 0, (PBYTE)&pcProxy, sizeof(pcProxy));
   
    if (S_OK == hr)
    {
        dwAccessType = INTERNET_OPEN_TYPE_PROXY;
        pszProxy = (LPTSTR) LocalAlloc(LPTR, ARRAYSIZE(pcProxy.szProxyServer));
        // Make sure pszProxy was allocated.
        hr = StringCchCopyN(pszProxy, ARRAYSIZE(pcProxy.szProxyServer),
                            pcProxy.szProxyServer, ARRAYSIZE(pcProxy.szProxyServer));
        if (S_OK != hr)
        {    // reset proxy info on error
            pszProxy = NULL;
        }
    }
    else if (E_NOINTERFACE == hr)
    {
        dwAccessType = INTERNET_OPEN_TYPE_DIRECT;
        pszProxy = NULL;
       
        // Reset hr, since it's not really an error here.
        hr = S_OK;
    }
    else
    {
        // unexpected hr code
        return 0;
    }
   
    ConnMgrReleaseConnection(hConnection, TRUE);
    return 1;
}