FPCM_GET_PLAYING
FPCM_PUT_PLAYING

struct SFPCGetPlaying
{    
    // [out]
    VARIANT_BOOL Playing;

    // [out]
    HRESULT hr;
};


struct SFPCPutPlaying
{
    // [in]
    VARIANT_BOOL Playing;

    // [out]
    HRESULT hr;
};

void GetPlaying(HWND hwndFlashPlayerControl)
{
    SFPCGetPlaying info;

    ::SendMessage(hwndFlashPlayerControl, FPCM_GET_PLAYING, 0, (LPARAM)&info);

    if FAILED(info.hr)
        // Error
    {
        // ...
    }
    else
        // OK
    {
        TCHAR lpszBuffer[1024];
        wsprintf(lpszBuffer, _T("%d"), info.Playing);

        ::MessageBox(NULL, lpszBuffer, _T("Result"), MB_OK);
    }
}


void PutPlaying(HWND hwndFlashPlayerControl, VARIANT_BOOL Playing)
{
    SFPCPutPlaying info;

    info.Playing = Playing;

    ::SendMessage(hwndFlashPlayerControl, FPCM_PUT_PLAYING, 0, (LPARAM)&info);

    if FAILED(info.hr)
        // Error
    {
        // ...
    }
    else
        // OK
    {
        // ...
    }
}