#define CAPS_BUFFER_SIZE    512 
 
#define MAX_LOADSTRING 25 
 
TCHAR szNumber[MAX_LOADSTRING]; 
HRESULT SHGetPhoneNumber(LPTSTR szNumber, UINT cchNumber, UINT nLineNumber); 
 
SHGetPhoneNumber(szNumber, MAX_LOADSTRING, 1);//getting phone number of line 1 
    MessageBox(NULL, szNumber, TEXT("Phone Number"), MB_OK); //显示号码 
HRESULT SHGetPhoneNumber(LPTSTR szNumber, UINT cchNumber, UINT nLineNumber) 
{ 
    HRESULT hr = E_FAIL; 
    LRESULT lResult = 0; 
    HLINEAPP hLineApp; 
    DWORD    dwNumDevs; //number of line devices 
    DWORD    dwAPIVersion = TAPI_API_HIGH_VERSION; 
    LINEINITIALIZEEXPARAMS liep; 
 
    DWORD dwTAPILineDeviceID; 
    const DWORD dwAddressID = nLineNumber - 1; 
 
    liep.dwTotalSize = sizeof(liep); 
    liep.dwOptions   = LINEINITIALIZEEXOPTION_USEEVENT; 
 
    //initialize line before accessing 
    if (SUCCEEDED(lineInitializeEx(&hLineApp, 0, 0,
 TEXT("ExTapi_Lib"), &dwNumDevs, &dwAPIVersion, &liep))) 
    { 
 
        BYTE* pCapBuf = NULL; 
        DWORD dwCapBufSize = CAPS_BUFFER_SIZE; 
        LINEEXTENSIONID LineExtensionID; 
        LINEDEVCAPS*     pLineDevCaps = NULL; 
        LINEADDRESSCAPS* placAddressCaps = NULL; 
 
        pCapBuf = new BYTE[dwCapBufSize]; 
        EXIT_ON_NULL(pCapBuf); 
 
        pLineDevCaps = (LINEDEVCAPS*)pCapBuf; 
        pLineDevCaps->dwTotalSize = dwCapBufSize; 
 
        // Get TSP Line Device ID 
        dwTAPILineDeviceID = 0xffffffff; 
        for (DWORD dwCurrentDevID = 0 ; dwCurrentDevID < dwNumDevs ;
 dwCurrentDevID++) 
        { 
//ensure TAPI, service provider, and application are all using the same versions 
            if (0 == lineNegotiateAPIVersion(hLineApp, dwCurrentDevID,
 TAPI_API_LOW_VERSION, TAPI_API_HIGH_VERSION, &dwAPIVersion, &LineExtensionID)) 
            {
                lResult = lineGetDevCaps(hLineApp, dwCurrentDevID,
 dwAPIVersion, 0, pLineDevCaps); 
 
 //increase buffer size if too small to hold the device capabilities 
                if (dwCapBufSize < pLineDevCaps->dwNeededSize) 
                {
                    delete[] pCapBuf;
                    dwCapBufSize = pLineDevCaps->dwNeededSize;
                    pCapBuf = new BYTE[dwCapBufSize];
                    EXIT_ON_NULL(pCapBuf);
 
                    pLineDevCaps = (LINEDEVCAPS*)pCapBuf; 
                    pLineDevCaps->dwTotalSize = dwCapBufSize; 
 
                    lResult = lineGetDevCaps(hLineApp, dwCurrentDevID,
 dwAPIVersion, 0, pLineDevCaps); 
                } 
//lResult of 0 means the device capabilities were successfully returned 
                if ((0 == lResult) && 
                    (0 == _tcscmp((TCHAR*)((BYTE*)pLineDevCaps+pLineDevCaps->
dwLineNameOffset), CELLTSP_LINENAME_STRING))) 
                { 
                    dwTAPILineDeviceID = dwCurrentDevID; 
                    break; 
                } 
            } 
        } 
 
        placAddressCaps = (LINEADDRESSCAPS*)pCapBuf; 
        placAddressCaps->dwTotalSize = dwCapBufSize; 
 
        lResult = lineGetAddressCaps(hLineApp, dwTAPILineDeviceID, dwAddressID,
 dwAPIVersion, 0, placAddressCaps); 
 
//increase buffer size if too small to hold the address capabilities 
        if (dwCapBufSize < placAddressCaps->dwNeededSize) 
        { 
            delete[] pCapBuf; 
            dwCapBufSize = placAddressCaps->dwNeededSize; 
            pCapBuf = new BYTE[dwCapBufSize]; 
            EXIT_ON_NULL(pCapBuf); 
 
            placAddressCaps = (LINEADDRESSCAPS*)pCapBuf; 
            placAddressCaps->dwTotalSize = dwCapBufSize; 
 
            lResult = lineGetAddressCaps(hLineApp, dwTAPILineDeviceID, dwAddressID,
 dwAPIVersion, 0, placAddressCaps); 
        } 
//lResult of 0 means the address capabilities were successfully returned 
        if (0 == lResult) 
        { 
            if (szNumber) 
            { 
                szNumber[0] = TEXT('\0'); 
                EXIT_ON_FALSE(0 != placAddressCaps->dwAddressSize);
// A non-zero dwAddressSize means a phone number was found 
                ASSERT(0 != placAddressCaps->dwAddressOffset); 
                PWCHAR tsAddress = (WCHAR*)(((BYTE*)placAddressCaps)
+placAddressCaps->dwAddressOffset);
                StringCchCopy(szNumber, cchNumber, tsAddress); 
            } 
 
            hr = S_OK; 
        } 
 
        delete[] pCapBuf; 
    } // End if () 
 
FuncExit: 
    lineShutdown(hLineApp); 
 
    return hr; 
}