Windows Mobile如何判断GPRS的接入点

Description:

思路：用ConnMgrQueryDetailedStatus找到Dest GUID, 然后根据Dest GUID用DMProcessConfigXML函数透过CM_GPRSEntries Configuration Service Provider来查接入点名称。
示例代码：

#include <stdlib.h>
#include <windows.h>

#include <connmgr.h>
#include <Connmgr_status.h>
#include <Cfgmgrapi.h>
#include <strsafe.h>

//   FUNCTION: GetAPNFromEntryName(LPCTSTR szEntryName, LPTSTR szAPN, int cchAPN)
//
//   PURPOSE: Get the GPRS Access Point Name form the Entry Name
//
HRESULT GetAPNFromEntryName(LPCTSTR szEntryName, LPTSTR szAPN, int cchAPN)
{
    // parm query formating string of "CM_GPRSEntries Configuration Service Provider"
    LPCTSTR szFormat =    TEXT("<wap-provisioningdoc>")
                        TEXT("    <characteristic type=/"CM_GPRSEntries/">")
                        TEXT("        <characteristic type=/"%s/">")
                        TEXT("            <characteristic type=/"DevSpecificCellular/">")
                        TEXT("                <parm-query name=/"GPRSInfoAccessPointName/"/>")
                        TEXT("            </characteristic>")
                        TEXT("        </characteristic>")
                        TEXT("    </characteristic>")
                        TEXT("</wap-provisioningdoc>");
    HRESULT hr = E_FAIL;
    LPTSTR szOutput   = NULL;

    if(NULL == szEntryName)
        return E_INVALIDARG;

    // prepare the query string with the special entry name
    LPTSTR szInput = new TCHAR[_tcslen(szFormat) + _tcslen(szEntryName) + 10];
    if(NULL == hr)
        return E_OUTOFMEMORY;

    _stprintf(szInput, szFormat, szEntryName);
  

    // Process the XML.
    hr = DMProcessConfigXML(szInput, CFGFLAG_PROCESS, &szOutput);

    if(S_OK == hr)
    {
        hr = E_FAIL;

        // find the value of GPRSInfoAccessPointName param
        LPTSTR szAPNStrStart = _tcsstr(szOutput, TEXT("value=/""));
        if(NULL != szAPNStrStart)
        {
            szAPNStrStart += _tcslen(TEXT("value=/""));

            // find the end of value string
            LPTSTR szAPNStrEnd = _tcsstr(szAPNStrStart, TEXT("/""));
            if(NULL != szAPNStrEnd)
            {
                // set the null char at the end of the value string
                *szAPNStrEnd = TEXT('/0');

                // get the final Access Point Name string
                _tcsncpy(szAPN, szAPNStrStart, cchAPN);
                hr = S_OK;
            }
        }

    }

    // the caller must delete the XML returned from DMProcessConfigXML.
    delete[] szOutput;

    // clear the input string
    delete[] szInput;

    return hr;
}

//
// we will enum the all connected GPRS
// and display their entry name and APN on the message box
//
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPTSTR    lpCmdLine,
                   int       nCmdShow)
{
    TCHAR szAPN[200];

    DWORD dwSize = 0;
    HRESULT hr = E_FAIL;

    //
    // Get the the required size of the buffer
    // with which the function needs to be called on the next attempt.
    //
    hr = ConnMgrQueryDetailedStatus(NULL, &dwSize);
    if(STRSAFE_E_INSUFFICIENT_BUFFER != hr)
        return hr;

    LPBYTE pBuffer = new BYTE[dwSize];
    if(NULL == pBuffer)
        return E_OUTOFMEMORY;

    //
    // Get the connection information
    //
    hr = ConnMgrQueryDetailedStatus((CONNMGR_CONNECTION_DETAILED_STATUS*)pBuffer, &dwSize);
    if(S_OK == hr)
    {

        //
        // Enum each connection entry
        //
        CONNMGR_CONNECTION_DETAILED_STATUS* cmStatus  = (CONNMGR_CONNECTION_DETAILED_STATUS*)pBuffer;
        while(NULL != cmStatus)
        {
            // find the connected GPRS entry
            if((cmStatus->dwParams & (CONNMGRDETAILEDSTATUS_PARAM_TYPE | CONNMGRDETAILEDSTATUS_PARAM_DESCRIPTION | CONNMGRDETAILEDSTATUS_PARAM_CONNSTATUS)) &&
                CM_CONNTYPE_CELLULAR == cmStatus->dwType &&
                CONNMGR_STATUS_CONNECTED == cmStatus->dwConnectionStatus &&
                NULL != cmStatus->szDescription)      
            {
                // get the connected GPRS APN
                if(S_OK == GetAPNFromEntryName(cmStatus->szDescription, szAPN, 200))
                    MessageBox(NULL, szAPN, cmStatus->szDescription, MB_OK | MB_ICONINFORMATION);

            }

            // test the next one
            cmStatus = cmStatus->pNext;
        }
    }

    // clear the buffer
    delete pBuffer;

    return 0;
}

http://04100109.blog.163.com/blog/static/69419881200961795038637/