CAcroApp mApp = new AcroApp();

            mApp.Hide();

            String szPdfPathConst = AppDomain.CurrentDomain.BaseDirectory + @"深入浅出WPF.pdf";

            AcroAVDoc g_AVDoc = new AcroAVDoc();

            //open the PDF

            if (g_AVDoc.Open(szPdfPathConst, ""))

            {

                int currentIndex = 0;

                bool formDataExists = true;

                Object newDoc = null;

                if (g_AVDoc.IsValid())

                {

                    CAcroPDDoc pdDoc = (CAcroPDDoc)g_AVDoc.GetPDDoc();

                    int iNum = pdDoc.GetNumPages();

                    Object jsObj = pdDoc.GetJSObject();

                    if (formDataExists)

                    {

                        Type T = jsObj.GetType();

                        object[] extractPagesParam = { currentIndex,iNum-1 };

                        newDoc = T.InvokeMember(

                            "extractPages",

                            BindingFlags.InvokeMethod |

                            BindingFlags.Public |

                            BindingFlags.Instance,

                            null, jsObj, extractPagesParam); 

                        String newFileName = AppDomain.CurrentDomain.BaseDirectory + "data\\" + currentIndex + ".png";

                        Directory.CreateDirectory(AppDomain.CurrentDomain.BaseDirectory + "data");

                        object[] saveAsParam = { newFileName, "com.adobe.acrobat.png" };

                        T.InvokeMember(

                        "saveAs",

                        BindingFlags.InvokeMethod |

                        BindingFlags.Public |

                        BindingFlags.Instance,

                        null, newDoc, saveAsParam);

                        formDataExists = currentIndex != iNum - 1;

                        object[] closeDocParam = { true };

                        T.InvokeMember(

                                "closeDoc",

                                BindingFlags.InvokeMethod |

                                BindingFlags.Public |

                                BindingFlags.Instance,

                                null, newDoc, closeDocParam);

                        currentIndex++;

                    }

                }

            }

            mApp.CloseAllDocs();

            mApp.Exit();