diff --git a/src/dpdfannot.cpp b/src/dpdfannot.cpp
index a517c61..082ec5d 100644
--- a/src/dpdfannot.cpp
+++ b/src/dpdfannot.cpp
@@ -3,19 +3,23 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
 #include "dpdfannot.h"
+#include <QDebug>
 
 DPdfAnnot::AnnotType DPdfAnnot::type()
 {
+    qDebug() << "Getting annotation type:" << m_type;
     return m_type;
 }
 
 void DPdfAnnot::setText(QString text)
 {
+    qDebug() << "Setting annotation text:" << text;
     m_text = text;
 }
 
 QString DPdfAnnot::text()
 {
+    qDebug() << "Getting annotation text:" << m_text;
     return m_text;
 }
 
@@ -31,6 +35,7 @@ bool DPdfTextAnnot::pointIn(QPointF pos)
 
 QList<QRectF> DPdfTextAnnot::boundaries()
 {
+    qDebug() << "Getting text annotation boundaries";
     QList<QRectF> list;
 
     list << m_rect;
@@ -40,6 +45,7 @@ QList<QRectF> DPdfTextAnnot::boundaries()
 
 void DPdfTextAnnot::setRectF(const QRectF &rectf)
 {
+    qDebug() << "Setting text annotation rectangle:" << rectf;
     m_rect = rectf;
 }
 
@@ -55,11 +61,13 @@ bool DPdfSquareAnnot::pointIn(QPointF pos)
 
 QList<QRectF> DPdfSquareAnnot::boundaries()
 {
+    qDebug() << "Getting square annotation boundaries";
     return QList<QRectF>() << m_rect;
 }
 
 void DPdfSquareAnnot::setRectF(const QRectF &rectf)
 {
+    qDebug() << "Setting square annotation rectangle:" << rectf;
     m_rect = rectf;
 }
 
@@ -80,21 +88,25 @@ bool DPdfHightLightAnnot::pointIn(QPointF pos)
 
 void DPdfHightLightAnnot::setColor(QColor color)
 {
+    qDebug() << "Setting highlight annotation color:" << color;
     m_color = color;
 }
 
 QColor DPdfHightLightAnnot::color()
 {
+    qDebug() << "Getting highlight annotation color:" << m_color;
     return m_color;
 }
 
 void DPdfHightLightAnnot::setBoundaries(QList<QRectF> rectList)
 {
+    qDebug() << "Setting highlight annotation boundaries, count:" << rectList.size();
     m_rectList = rectList;
 }
 
 QList<QRectF> DPdfHightLightAnnot::boundaries()
 {
+    qDebug() << "Getting highlight annotation boundaries";
     return m_rectList;
 }
 
@@ -134,6 +146,7 @@ bool DPdfLinkAnnot::pointIn(QPointF pos)
 
 QList<QRectF> DPdfLinkAnnot::boundaries()
 {
+    qDebug() << "Getting link annotation boundaries";
     QList<QRectF> list;
 
     list << m_rect;
@@ -143,34 +156,42 @@ QList<QRectF> DPdfLinkAnnot::boundaries()
 
 void DPdfLinkAnnot::setRectF(const QRectF &rect)
 {
+    qDebug() << "Setting link annotation rectangle:" << rect;
     m_rect = rect;
 }
 
 void DPdfLinkAnnot::setUrl(QString url)
 {
+    qDebug() << "Setting link annotation URL:" << url;
     m_url = url;
 
-    if (!m_url.contains("http://") && !m_url.contains("https://"))
+    if (!m_url.contains("http://") && !m_url.contains("https://")) {
+        qDebug() << "Prepending http:// to URL";
         m_url.prepend("http://");
+    }
 }
 
 QString DPdfLinkAnnot::url() const
 {
+    qDebug() << "Getting link annotation URL:" << m_url;
     return m_url;
 }
 
 void DPdfLinkAnnot::setFilePath(QString filePath)
 {
+    qDebug() << "Setting link annotation file path:" << filePath;
     m_filePath = filePath;
 }
 
 QString DPdfLinkAnnot::filePath() const
 {
+    qDebug() << "Getting link annotation file path:" << m_filePath;
     return m_filePath;
 }
 
 void DPdfLinkAnnot::setPage(int index, float left, float top)
 {
+    qDebug() << "Setting link annotation page properties - index:" << index << "left:" << left << "top:" << top;
     m_index = index;
     m_left = left;
     m_top = top;
@@ -178,6 +199,7 @@ void DPdfLinkAnnot::setPage(int index, float left, float top)
 
 int DPdfLinkAnnot::pageIndex() const
 {
+    qDebug() << "Getting link annotation page index:" << m_index;
     return m_index;
 }
 
@@ -188,20 +210,21 @@ QPointF DPdfLinkAnnot::offset() const
 
 void DPdfLinkAnnot::setLinkType(int type)
 {
+    qDebug() << "Setting link annotation type:" << type;
     m_linkType = type;
 }
 
 int DPdfLinkAnnot::linkType() const
 {
+    qDebug() << "Getting link annotation type:" << m_linkType;
     return m_linkType;
 }
 
 bool DPdfLinkAnnot::isValid() const
 {
-    if (Goto == m_linkType)
-        return m_index != -1;
-
-    return true;
+    bool valid = (Goto == m_linkType) ? (m_index != -1) : true;
+    qDebug() << "Checking link annotation validity:" << valid;
+    return valid;
 }
 
 DPdfCIRCLEAnnot::DPdfCIRCLEAnnot()
@@ -216,16 +239,19 @@ bool DPdfCIRCLEAnnot::pointIn(QPointF pos)
 
 QList<QRectF> DPdfCIRCLEAnnot::boundaries()
 {
+    qDebug() << "Getting circle annotation boundaries";
     return QList<QRectF>() << m_rect;
 }
 
 void DPdfCIRCLEAnnot::setRectF(const QRectF &rectf)
 {
+    qDebug() << "Setting circle annotation rectangle:" << rectf;
     m_rect = rectf;
 }
 
 void DPdfCIRCLEAnnot::setBoundaries(QList<QRectF> rectList)
 {
+    qDebug() << "Setting circle annotation boundaries, count:" << rectList.size();
     m_rectList = rectList;
 }
 
@@ -241,11 +267,13 @@ bool DPdfUnderlineAnnot::pointIn(QPointF pos)
 
 QList<QRectF> DPdfUnderlineAnnot::boundaries()
 {
+    qDebug() << "Getting underline annotation boundaries";
     return QList<QRectF>() << m_rect;
 }
 
 void DPdfUnderlineAnnot::setRectF(const QRectF &rectf)
 {
+    qDebug() << "Setting underline annotation rectangle:" << rectf;
     m_rect = rectf;
 }
 
@@ -262,5 +290,6 @@ bool DPdfWidgetAnnot::pointIn(QPointF pos)
 
 QList<QRectF> DPdfWidgetAnnot::boundaries()
 {
+    qDebug() << "Getting widget annotation boundaries";
     return QList<QRectF>();
 }
diff --git a/src/dpdfdoc.cpp b/src/dpdfdoc.cpp
index fb2a46f..c5d68fb 100755
--- a/src/dpdfdoc.cpp
+++ b/src/dpdfdoc.cpp
@@ -24,6 +24,7 @@
 #include <QStorageInfo>
 #include <QStandardPaths>
 #include <QDir>
+#include <QDebug>
 
 /**
  * @brief The PDFIumLoader class for FPDF_FILEACCESS
@@ -70,7 +71,9 @@ static bool isRemoteFile(const QString &filePath)
     
     QString fsType = storage.fileSystemType().toLower();
     
-    return (fsType == "cifs" || fsType == "smb" || fsType == "smbfs");
+    bool isRemote = (fsType == "cifs" || fsType == "smb" || fsType == "smbfs");
+    qDebug() << filePath << "isRemote:" << isRemote;
+    return isRemote;
 }
 
 DPdfDoc::Status parseError(int error)
@@ -94,6 +97,7 @@ DPdfDoc::Status parseError(int error)
         err_code = DPdfDoc::HANDLER_ERROR;
         break;
     }
+    qDebug() << "Parsed error code:" << error << "to status:" << err_code;
     return err_code;
 }
 
@@ -128,11 +132,14 @@ DPdfDocPrivate::DPdfDocPrivate()
 DPdfDocPrivate::~DPdfDocPrivate()
 {
     DPdfMutexLocker locker("DPdfDocPrivate::~DPdfDocPrivate()");
+    qDebug() << "Cleaning up DPdfDocPrivate resources";
 
     qDeleteAll(m_pages);
 
-    if (nullptr != m_docHandler)
+    if (nullptr != m_docHandler) {
+        qDebug() << "Closing PDF document handler";
         FPDF_CloseDocument(reinterpret_cast<FPDF_DOCUMENT>(m_docHandler));
+    }
     
     if (!m_tempFilePath.isEmpty() && QFile::exists(m_tempFilePath)) {
         QFile::remove(m_tempFilePath);
@@ -142,12 +149,14 @@ DPdfDocPrivate::~DPdfDocPrivate()
 
 DPdfDoc::Status DPdfDocPrivate::loadFile(const QString &filePath, const QString &password)
 {
+    qDebug() << "Loading PDF file:" << filePath;
     m_filePath = filePath;
     m_tempFilePath.clear();
     m_isRemoteFile = false;
     m_pages.clear();    
 
     if (!QFile::exists(m_filePath)) {
+        qWarning() << "File not found:" << m_filePath;
         m_status = DPdfDoc::FILE_NOT_FOUND_ERROR;
         return m_status;
     }
@@ -203,6 +212,7 @@ DPdfDoc::Status DPdfDocPrivate::loadFile(const QString &filePath, const QString
 
     if (m_docHandler) {
         m_pageCount = FPDF_GetPageCount(reinterpret_cast<FPDF_DOCUMENT>(m_docHandler));
+        qDebug() << "Document loaded successfully with" << m_pageCount << "pages";
         m_pages.fill(nullptr, m_pageCount);
     }
 
@@ -223,23 +233,30 @@ DPdfDoc::~DPdfDoc()
 
 bool DPdfDoc::isValid() const
 {
-    return d_func()->m_docHandler != nullptr;
+    bool valid = d_func()->m_docHandler != nullptr;
+    qDebug() << "Checking document validity:" << valid;
+    return valid;
 }
 
 bool DPdfDoc::isEncrypted() const
 {
-    if (!isValid())
+    if (!isValid()) {
+        qDebug() << "Document is not valid, cannot check encryption";
         return false;
+    }
 
     DPdfMutexLocker locker("DPdfDoc::isEncrypted()");
-
-    return FPDF_GetDocPermissions(reinterpret_cast<FPDF_DOCUMENT>(d_func()->m_docHandler)) != 0xFFFFFFFF;
+    bool encrypted = FPDF_GetDocPermissions(reinterpret_cast<FPDF_DOCUMENT>(d_func()->m_docHandler)) != 0xFFFFFFFF;
+    qDebug() << "Document encryption status:" << encrypted;
+    return encrypted;
 }
 
 DPdfDoc::Status DPdfDoc::tryLoadFile(const QString &filename, const QString &password)
 {
+    qDebug() << "Attempting to load file:" << filename;
     Status status = NOT_LOADED;
     if (!QFile::exists(filename)) {
+        qWarning() << "File not found:" << filename;
         status = FILE_NOT_FOUND_ERROR;
         return status;
     }
@@ -251,8 +268,10 @@ DPdfDoc::Status DPdfDoc::tryLoadFile(const QString &filename, const QString &pas
 
     DPdfDocHandler *docHandler = static_cast<DPdfDocHandler *>(ptr);
     status = docHandler ? SUCCESS : parseError(static_cast<int>(FPDF_GetLastError()));
+    qDebug() << "File load attempt status:" << status;
 
     if (docHandler) {
+        qDebug() << "Closing test document handler";
         FPDF_CloseDocument(reinterpret_cast<FPDF_DOCUMENT>(docHandler));
     }
 
@@ -261,6 +280,7 @@ DPdfDoc::Status DPdfDoc::tryLoadFile(const QString &filename, const QString &pas
 
 bool DPdfDoc::isLinearized(const QString &fileName)
 {
+    qDebug() << "Checking if file is linearized:" << fileName;
     QFile file(fileName);
     if (!file.open(QFile::ReadOnly)) {
         qInfo() << "file open failed when isLinearized" << fileName;
@@ -287,7 +307,9 @@ bool DPdfDoc::isLinearized(const QString &fileName)
     FPDF_AVAIL m_PdfAvail;
     m_PdfAvail = FPDFAvail_Create(&m_fileAvail, &m_fileAccess);
 
-    return FPDFAvail_IsLinearized(m_PdfAvail) > 0;
+    bool linearized = FPDFAvail_IsLinearized(m_PdfAvail) > 0;
+    qDebug() << "File linearization status:" << linearized;
+    return linearized;
 }
 
 static QFile saveWriter;
@@ -300,11 +322,13 @@ int writeFile(struct FPDF_FILEWRITE_* pThis, const void *pData, unsigned long si
 
 bool DPdfDoc::saveRemoteFile()
 {
+    qDebug() << "Saving remote file:" << d_func()->m_filePath;
     return saveAs(d_func()->m_filePath);
 }
 
 bool DPdfDoc::saveLocalFile()
 {
+    qDebug() << "Saving local file:" << d_func()->m_filePath;
     FPDF_FILEWRITE write;
 
     write.WriteBlock = writeFile;
@@ -314,9 +338,12 @@ bool DPdfDoc::saveLocalFile()
     QString tempFilePath = tempDir.path() + "/" + QUuid::createUuid().toString();
     
     saveWriter.setFileName(tempFilePath);
+    qDebug() << "Using temporary file for save:" << tempFilePath;
 
-    if (!saveWriter.open(QIODevice::WriteOnly))
+    if (!saveWriter.open(QIODevice::WriteOnly)) {
+        qWarning() << "Failed to open temporary file for writing";
         return false;
+    }
     
     DPdfMutexLocker locker("DPdfDoc::save");
     bool result = FPDF_SaveAsCopy(reinterpret_cast<FPDF_DOCUMENT>(d_func()->m_docHandler), &write, FPDF_NO_INCREMENTAL);
@@ -325,9 +352,10 @@ bool DPdfDoc::saveLocalFile()
     saveWriter.close();
     
     QFile tempFile(tempFilePath);
-
-    if (!tempFile.open(QIODevice::ReadOnly))
+    if (!tempFile.open(QIODevice::ReadOnly)) {
+        qWarning() << "Failed to open temporary file for reading";
         return false;
+    }
     
     QByteArray array = tempFile.readAll();
 
@@ -337,21 +365,27 @@ bool DPdfDoc::saveLocalFile()
     
     file.remove();          //不remove会出现第二次导出丢失数据问题 (保存动作完成之后，如果当前文档是当初打开那个，下一次导出会出错)
     
-    if (!file.open(QIODevice::WriteOnly | QIODevice::Truncate))
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
+        qWarning() << "Failed to open target file for writing";
         return false;
+    }
     
-    if (array.size() != file.write(array))
+    if (array.size() != file.write(array)) {
+        qWarning() << "Failed to write all data to target file";
         result = false;
+    }
     
     file.flush();//函数将用户缓存中的内容写入内核缓冲区
     fsync(file.handle());//将内核缓冲写入文件(磁盘)
     file.close();
+    
+    qDebug() << "Local file save completed with status:" << result;
     return result;
 }
 
 bool DPdfDoc::save()
 {
-
+    qDebug() << "Saving document, isRemoteFile:" << d_func()->m_isRemoteFile;
     if (d_func()->m_isRemoteFile) {
         return saveRemoteFile();
     } else {
@@ -361,21 +395,24 @@ bool DPdfDoc::save()
 
 bool DPdfDoc::saveAs(const QString &filePath)
 {
+    qDebug() << "Saving document as:" << filePath;
     FPDF_FILEWRITE write;
 
     write.WriteBlock = writeFile;
 
     saveWriter.setFileName(filePath);
 
-    if (!saveWriter.open(QIODevice::ReadWrite))
+    if (!saveWriter.open(QIODevice::ReadWrite)) {
+        qWarning() << "Failed to open file for saving:" << filePath;
         return false;
+    }
 
     DPdfMutexLocker locker("DPdfDoc::saveAs");
     bool result = FPDF_SaveAsCopy(reinterpret_cast<FPDF_DOCUMENT>(d_func()->m_docHandler), &write, FPDF_NO_INCREMENTAL);
     locker.unlock();
 
     saveWriter.close();
-
+    qDebug() << "Save as completed with status:" << result;
     return result;
 }
 
@@ -396,10 +433,14 @@ DPdfDoc::Status DPdfDoc::status() const
 
 DPdfPage *DPdfDoc::page(int i, qreal xRes, qreal yRes)
 {
-    if (i < 0 || i >= d_func()->m_pageCount)
+    qDebug() << "Getting page" << i << "with resolution" << xRes << "x" << yRes;
+    if (i < 0 || i >= d_func()->m_pageCount) {
+        qWarning() << "Invalid page index:" << i;
         return nullptr;
+    }
 
     if (!d_func()->m_pages[i]) {
+        qDebug() << "Creating new page object for index:" << i;
         d_func()->m_pages[i] = new DPdfPage(d_func()->m_docHandler, i, xRes, yRes);
     }
 
@@ -436,20 +477,24 @@ void collectBookmarks(DPdfDoc::Outline &outline, const CPDF_BookmarkTree &tree,
 
 DPdfDoc::Outline DPdfDoc::outline(qreal xRes, qreal yRes)
 {
+    qDebug() << "Getting document outline with resolution" << xRes << "x" << yRes;
     DPdfMutexLocker locker("DPdfDoc::outline");
 
     Outline outline;
     CPDF_BookmarkTree tree(reinterpret_cast<CPDF_Document *>(d_func()->m_docHandler));
     CPDF_Bookmark cBookmark;
     const CPDF_Bookmark &firstRootChild = tree.GetFirstChild(&cBookmark);
-    if (firstRootChild.GetDict() != nullptr)
+    if (firstRootChild.GetDict() != nullptr) {
+        qDebug() << "Collecting bookmarks from document";
         collectBookmarks(outline, tree, firstRootChild, xRes, yRes);
+    }
 
     return outline;
 }
 
 DPdfDoc::Properies DPdfDoc::proeries()
 {
+    qDebug() << "Getting document properties";
     DPdfMutexLocker locker("DPdfDoc::proeries");
 
     Properies properies;
@@ -468,6 +513,7 @@ DPdfDoc::Properies DPdfDoc::proeries()
 
     const CPDF_Dictionary *pInfo = pDoc->GetInfo();
     if (pInfo) {
+        qDebug() << "Reading document metadata from info dictionary";
         const WideString &KeyWords = pInfo->GetUnicodeTextFor("KeyWords");
         properies.insert("KeyWords", QString::fromWCharArray(KeyWords.c_str()));
 
@@ -492,11 +538,16 @@ DPdfDoc::Properies DPdfDoc::proeries()
 
 QString DPdfDoc::label(int index) const
 {
+    qDebug() << "Getting page label for index:" << index;
     DPdfMutexLocker locker("DPdfDoc::label index = " + QString::number(index));
 
     CPDF_PageLabel label(reinterpret_cast<CPDF_Document *>(d_func()->m_docHandler));
     const Optional<WideString> &str = label.GetLabel(index);
-    if (str.has_value())
-        return QString::fromWCharArray(str.value().c_str(), static_cast<int>(str.value().GetLength()));
+    if (str.has_value()) {
+        QString result = QString::fromWCharArray(str.value().c_str(), static_cast<int>(str.value().GetLength()));
+        qDebug() << "Found page label:" << result;
+        return result;
+    }
+    qDebug() << "No page label found for index:" << index;
     return QString();
 }
diff --git a/src/dpdfglobal.cpp b/src/dpdfglobal.cpp
index 524654a..3e28f9a 100755
--- a/src/dpdfglobal.cpp
+++ b/src/dpdfglobal.cpp
@@ -16,35 +16,48 @@ const static DPdfGlobal instance = DPdfGlobal();
 
 void DPdfGlobal::init()
 {
+    qDebug() << "Initializing PDF library";
     if (!initialized) {
         FPDF_InitLibrary();
         initialized = true;
+        qDebug() << "PDF library initialized successfully";
+    } else {
+        qDebug() << "PDF library already initialized";
     }
 }
 
 void DPdfGlobal::destory()
 {
+    qDebug() << "Destroying PDF library";
     if (initialized) {
         FPDF_DestroyLibrary();
         initialized = false;
+        qDebug() << "PDF library destroyed successfully";
+    } else {
+        qDebug() << "PDF library was not initialized";
     }
 }
 
 DPdfGlobal::DPdfGlobal()
 {
+    qDebug() << "Creating DPdfGlobal instance";
     init();
 }
 
 DPdfGlobal::~DPdfGlobal()
 {
+    qDebug() << "Destroying DPdfGlobal instance";
     destory();
 }
 
 QString DPdfGlobal::textCodeType(const char *text)
 {
+    qDebug() << "Detecting text encoding";
     DetectObj *obj = detect_obj_init();
     detect(text, &obj);
     const QString &encodeind = QString(obj->encoding).toLower();
+    qDebug() << "Detected encoding:" << encodeind;
+    
     detect_obj_free(&obj);
     return encodeind;
 }
diff --git a/src/dpdfpage.cpp b/src/dpdfpage.cpp
index 445e7bf..aa1394d 100755
--- a/src/dpdfpage.cpp
+++ b/src/dpdfpage.cpp
@@ -5,6 +5,7 @@
 #include "dpdfdoc.h"
 #include "dpdfpage.h"
 #include "dpdfannot.h"
+#include <QDebug>
 
 #include "public/fpdfview.h"
 #include "public/fpdf_text.h"
@@ -134,22 +135,30 @@ DPdfPagePrivate::DPdfPagePrivate(DPdfDocHandler *handler, int index, qreal xRes,
     m_doc(reinterpret_cast<FPDF_DOCUMENT>(handler)), m_index(index), m_xRes(xRes), m_yRes(yRes)
 {
     DPdfMutexLocker locker("DPdfPagePrivate::DPdfPagePrivate index = " + QString::number(index));
+    qDebug() << "Creating page private object for index:" << index << "with resolution:" << xRes << "x" << yRes;
 
     //宽高会受自身旋转值影响 单位:point 1/72inch 高分屏上要乘以系数
     FPDF_GetPageSizeByIndex(m_doc, index, &m_width_pt, &m_height_pt);
+    qDebug() << "Page size:" << m_width_pt << "x" << m_height_pt << "points";
 
     FPDF_PAGE page = FPDF_LoadNoParsePage(m_doc, m_index);
     m_isValid = (page != nullptr);
+    qDebug() << "Page validity:" << m_isValid;
     FPDF_ClosePage(page);
 }
 
 DPdfPagePrivate::~DPdfPagePrivate()
 {
-    if (m_textPage)
+    qDebug() << "Destroying page private object for index:" << m_index;
+    if (m_textPage) {
+        qDebug() << "Closing text page";
         FPDFText_ClosePage(m_textPage);
+    }
 
-    if (m_page)
+    if (m_page) {
+        qDebug() << "Closing PDF page";
         FPDF_ClosePage(m_page);
+    }
 
     qDeleteAll(m_dAnnots);
 }
@@ -168,7 +177,9 @@ void DPdfPagePrivate::loadPage()
 {
     if (nullptr == m_page) {
         DPdfMutexLocker locker("DPdfPagePrivate::loadPage() index = " + QString::number(m_index));//即使其他文档的page在加载时，多线程调用此函数也会崩溃，非常线程不安全,此处需要加锁
+        qDebug() << "Loading page:" << m_index;
         m_page = FPDF_LoadPage(m_doc, m_index);
+        qDebug() << "Page loaded:" << (m_page != nullptr);
     }
 }
 
@@ -178,7 +189,9 @@ void DPdfPagePrivate::loadTextPage()
 
     if (nullptr == m_textPage) {
         DPdfMutexLocker locker("DPdfPagePrivate::loadTextPage() index = " + QString::number(m_index));
+        qDebug() << "Loading text page:" << m_index;
         m_textPage = FPDFText_LoadPage(m_page);
+        qDebug() << "Text page loaded:" << (m_textPage != nullptr);
     }
 }
 
@@ -204,23 +217,29 @@ int DPdfPagePrivate::oriRotation()
 bool DPdfPagePrivate::loadAnnots()
 {
     DPdfMutexLocker locker("DPdfPagePrivate::allAnnots");
+    qDebug() << "Loading annotations for page:" << m_index;
 
     //使用临时page，不完全加载,防止刚开始消耗时间过长
     FPDF_PAGE page = m_page;
 
-    if (page == nullptr)
+    if (page == nullptr) {
+        qDebug() << "Page loaded without parsing";
         page = FPDF_LoadNoParsePage(m_doc, m_index);      //不调用ParseContent，目前观察不会导致多线程崩溃
+    }
 
     if (nullptr == page) {
+        qWarning() << "Failed to load page for annotations";
         return false;
     }
 
     CPDF_Page *pPage = CPDFPageFromFPDFPage(page);
 
     int rotation = pPage->GetPageRotation();
+    qDebug() << "Page rotation:" << rotation;
 
     //获取当前注释
     int annotCount = FPDFPage_GetAnnotCount(page);
+    qDebug() << "Found" << annotCount << "annotations";
 
     for (int i = 0; i < annotCount; ++i) {
         FPDF_ANNOTATION annot = FPDFPage_GetAnnot(page, i);
@@ -426,8 +445,10 @@ bool DPdfPagePrivate::loadAnnots()
         FPDFPage_CloseAnnot(annot);
     }
 
-    if (m_page == nullptr)
+    if (m_page == nullptr) {
+        qDebug() << "Closing temporary page used for annotation loading";
         FPDF_ClosePage(page);
+    }
 
     m_isLoadAnnots = true;
 
@@ -436,6 +457,7 @@ bool DPdfPagePrivate::loadAnnots()
 
 bool DPdfPagePrivate::initAnnot(DPdfAnnot *dAnnot)
 {
+    qDebug() << "Initializing annotation";
     if (DPdfAnnot::ALink != dAnnot->type())
         return true;
 
@@ -581,16 +603,23 @@ int DPdfPage::index() const
 
 QImage DPdfPage::image(int width, int height, QRect slice)
 {
-    if (nullptr == d_func()->m_doc)
+    qDebug() << "Rendering page image:" << width << "x" << height << "slice:" << slice;
+    if (nullptr == d_func()->m_doc) {
+        qWarning() << "Document is null";
         return QImage();
+    }
 
-    if (!slice.isValid())
+    if (!slice.isValid()) {
+        qDebug() << "Using full page slice";
         slice = QRect(0, 0, width, height);
+    }
 
     QImage image(slice.width(), slice.height(), QImage::Format_ARGB32);
 
-    if (image.isNull())
+    if (image.isNull()) {
+        qWarning() << "Failed to create image buffer";
         return QImage();
+    }
 
     image.fill(0xFFFFFFFF);
 
@@ -598,22 +627,26 @@ QImage DPdfPage::image(int width, int height, QRect slice)
 
     FPDF_PAGE page = FPDF_LoadPage(d_func()->m_doc, d_func()->m_index);
 
-    if (nullptr == page)
+    if (nullptr == page) {
+        qWarning() << "Failed to load page for rendering";
         return QImage();
+    }
 
     FPDF_BITMAP bitmap = FPDFBitmap_CreateEx(image.width(), image.height(), FPDFBitmap_BGRA, image.scanLine(0), image.bytesPerLine());
 
     if (nullptr != bitmap) {
+        qDebug() << "Rendering page to bitmap";
         FPDF_RenderPageBitmap(bitmap, page, slice.x(), slice.y(), slice.width(), slice.height(), width, height, 0, FPDF_ANNOT);
 
         if (slice.width() == width && slice.height() == height) {
+            qDebug() << "Rendering form fields";
             FPDF_FORMFILLINFO info;
 
             info.version = 1;
 
             FPDF_FORMHANDLE firmHandle = FPDFDOC_InitFormFillEnvironment(d_func()->m_doc, &info);
 
-            FPDF_FFLDraw(firmHandle, bitmap, page, 0, 0,  width, height, 0, FPDF_ANNOT);
+            FPDF_FFLDraw(firmHandle, bitmap, page, 0, 0, width, height, 0, FPDF_ANNOT);
         }
 
         FPDFBitmap_Destroy(bitmap);
@@ -633,6 +666,7 @@ QImage DPdfPage::image(int width, int height, QRect slice)
 //        }
 //    }
 
+    qDebug() << "Page image rendered successfully";
     return image;
 }
 
@@ -760,6 +794,7 @@ bool DPdfPage::textRect(int index, QRectF &textrect)
 
 QString DPdfPage::text(const QRectF &rect)
 {
+    qDebug() << "Getting text from rectangle:" << rect;
     d_func()->loadTextPage();
 
     QRectF pointRect = d_func()->transPixelToPoint(rect);
@@ -775,22 +810,26 @@ QString DPdfPage::text(const QRectF &rect)
 
     auto text = reinterpret_cast<CPDF_TextPage *>(d_func()->m_textPage)->GetTextByRect(fxRect);
 
+    qDebug() << "Text retrieved successfully";
     return QString::fromWCharArray(text.c_str(), static_cast<int>(text.GetLength()));
 }
 
 QString DPdfPage::text(int index, int charCount)
 {
+    qDebug() << "Getting text from index:" << index << "count:" << charCount;
     d_func()->loadTextPage();
 
     DPdfMutexLocker locker("DPdfPage::text(int index, int charCount) index = " + QString::number(this->index()));
 
     auto text = reinterpret_cast<CPDF_TextPage *>(d_func()->m_textPage)->GetPageText(index, charCount);
 
+    qDebug() << "Text retrieved successfully";
     return QString::fromWCharArray(text.c_str(), static_cast<int>(text.GetLength()));
 }
 
 DPdfAnnot *DPdfPage::createTextAnnot(QPointF pos, QString text)
 {
+    qDebug() << "Creating text annotation at position:" << pos;
     d_func()->loadPage();
 
     QPointF pointPos = d_func()->transPixelToPoint(pos);
@@ -802,6 +841,7 @@ DPdfAnnot *DPdfPage::createTextAnnot(QPointF pos, QString text)
     FPDF_ANNOTATION annot = FPDFPage_CreateAnnot(d_func()->m_page, subType);
 
     if (!FPDFAnnot_SetStringValue(annot, "Contents", text.utf16())) {
+        qWarning() << "Failed to set annotation text";
         FPDFPage_CloseAnnot(annot);
         return nullptr;
     }
@@ -809,6 +849,7 @@ DPdfAnnot *DPdfPage::createTextAnnot(QPointF pos, QString text)
     FS_RECTF fs_rect = d_func()->transRect(d_func()->oriRotation(), QRectF(pointPos.x() - 10, pointPos.y() - 10, 20, 20));
 
     if (!FPDFAnnot_SetRect(annot, &fs_rect)) {
+        qWarning() << "Failed to set annotation rectangle";
         FPDFPage_CloseAnnot(annot);
         return nullptr;
     }
@@ -835,12 +876,15 @@ DPdfAnnot *DPdfPage::createTextAnnot(QPointF pos, QString text)
 
 bool DPdfPage::updateTextAnnot(DPdfAnnot *dAnnot, QString text, QPointF pos)
 {
+    qDebug() << "Updating text annotation";
     d_func()->loadPage();
 
     DPdfTextAnnot *textAnnot = static_cast<DPdfTextAnnot *>(dAnnot);
 
-    if (nullptr == textAnnot)
+    if (nullptr == textAnnot) {
+        qWarning() << "Text annotation is null";
         return false;
+    }
 
     int index = d_func()->allAnnots().indexOf(dAnnot);
 
@@ -849,6 +893,7 @@ bool DPdfPage::updateTextAnnot(DPdfAnnot *dAnnot, QString text, QPointF pos)
     FPDF_ANNOTATION annot = FPDFPage_GetAnnot(d_func()->m_page, index);
 
     if (!FPDFAnnot_SetStringValue(annot, "Contents", text.utf16())) {
+        qWarning() << "Failed to set annotation text";
         FPDFPage_CloseAnnot(annot);
         return false;
     }
@@ -862,6 +907,7 @@ bool DPdfPage::updateTextAnnot(DPdfAnnot *dAnnot, QString text, QPointF pos)
         FS_RECTF fs_rect = d_func()->transRect(d_func()->oriRotation(), QRectF(pointPos.x() - pointSize.width() / 2, pointPos.y() - pointSize.height() / 2, pointSize.width(), pointSize.height()));
 
         if (!FPDFAnnot_SetRect(annot, &fs_rect)) {
+            qWarning() << "Failed to set annotation rectangle";
             FPDFPage_CloseAnnot(annot);
             return false;
         }
@@ -875,11 +921,13 @@ bool DPdfPage::updateTextAnnot(DPdfAnnot *dAnnot, QString text, QPointF pos)
 
     emit annotUpdated(dAnnot);
 
+    qDebug() << "Text annotation updated successfully";
     return true;
 }
 
 DPdfAnnot *DPdfPage::createHightLightAnnot(const QList<QRectF> &rects, QString text, QColor color)
 {
+    qDebug() << "Creating highlight annotation:" << rects << text << color;
     d_func()->loadPage();
 
     FPDF_ANNOTATION_SUBTYPE subType = FPDF_ANNOT_HIGHLIGHT;
@@ -893,6 +941,7 @@ DPdfAnnot *DPdfPage::createHightLightAnnot(const QList<QRectF> &rects, QString t
                                                static_cast<unsigned int>(color.green()),
                                                static_cast<unsigned int>(color.blue()),
                                                static_cast<unsigned int>(color.alpha()))) {
+        qWarning() << "Failed to set annotation color";
         FPDFPage_CloseAnnot(annot);
         return nullptr;
     }
@@ -915,6 +964,7 @@ DPdfAnnot *DPdfPage::createHightLightAnnot(const QList<QRectF> &rects, QString t
     }
 
     if (!FPDFAnnot_SetStringValue(annot, "Contents", text.utf16())) {
+        qWarning() << "Failed to set annotation text";
         FPDFPage_CloseAnnot(annot);
         return nullptr;
     }
@@ -942,12 +992,15 @@ DPdfAnnot *DPdfPage::createHightLightAnnot(const QList<QRectF> &rects, QString t
 
 bool DPdfPage::updateHightLightAnnot(DPdfAnnot *dAnnot, QColor color, QString text)
 {
+    qDebug() << "Updating highlight annotation:" << color << text;
     d_func()->loadPage();
 
     DPdfHightLightAnnot *hightLightAnnot = static_cast<DPdfHightLightAnnot *>(dAnnot);
 
-    if (nullptr == hightLightAnnot)
+    if (nullptr == hightLightAnnot) {
+        qWarning() << "Highlight annotation is null";
         return false;
+    }
 
     int index = d_func()->allAnnots().indexOf(dAnnot);
 
@@ -961,6 +1014,7 @@ bool DPdfPage::updateHightLightAnnot(DPdfAnnot *dAnnot, QColor color, QString te
                                 static_cast<unsigned int>(color.green()),
                                 static_cast<unsigned int>(color.blue()),
                                 static_cast<unsigned int>(color.alpha()))) {
+            qWarning() << "Failed to set annotation color";
             FPDFPage_CloseAnnot(annot);
             return false;
         }
@@ -968,6 +1022,7 @@ bool DPdfPage::updateHightLightAnnot(DPdfAnnot *dAnnot, QColor color, QString te
     }
 
     if (!FPDFAnnot_SetStringValue(annot, "Contents", text.utf16())) {
+        qWarning() << "Failed to set annotation text";
         FPDFPage_CloseAnnot(annot);
         return false;
     }
@@ -982,23 +1037,29 @@ bool DPdfPage::updateHightLightAnnot(DPdfAnnot *dAnnot, QColor color, QString te
 
 bool DPdfPage::removeAnnot(DPdfAnnot *dAnnot)
 {
+    qDebug() << "Removing annotation";
     d_func()->loadPage();
 
     int index = d_func()->allAnnots().indexOf(dAnnot);
 
-    if (index < 0)
+    if (index < 0) {
+        qWarning() << "Annotation not found";
         return false;
+    }
 
     DPdfMutexLocker locker("DPdfPage::removeAnnot index = " + QString::number(this->index()));
 
-    if (!FPDFPage_RemoveAnnot(d_func()->m_page, index))
+    if (!FPDFPage_RemoveAnnot(d_func()->m_page, index)) {
+        qWarning() << "Failed to remove annotation";
         return false;
+    }
 
     const QList<DPdfAnnot *> &dAnnots = d_func()->allAnnots(); //only Load
     Q_UNUSED(dAnnots);
     d_func()->m_dAnnots.removeAll(dAnnot);
 
     emit annotRemoved(dAnnot);
+    qDebug() << "Annotation removed successfully";
 
     delete dAnnot;
 
@@ -1007,6 +1068,7 @@ bool DPdfPage::removeAnnot(DPdfAnnot *dAnnot)
 
 QVector<DPdfGlobal::PageSection> DPdfPage::search(const QString &text, bool matchCase, bool wholeWords)
 {
+    qDebug() << "Searching for text:" << text << "matchCase:" << matchCase << "wholeWords:" << wholeWords;
     d_func()->loadTextPage();
 
     DPdfMutexLocker locker("DPdfPage::search index = " + QString::number(this->index()));
@@ -1023,11 +1085,15 @@ QVector<DPdfGlobal::PageSection> DPdfPage::search(const QString &text, bool matc
 
     FPDF_SCHHANDLE schandle = FPDFText_FindStart(d_func()->m_textPage, text.utf16(), flags, 0);
     if (schandle) {
+        qDebug() << "Search started successfully";
         int page = d_func()->m_index;
         FPDF_PAGE pdfPage = FPDF_LoadPage(d_func()->m_doc, page);
         double pageHeight = FPDF_GetPageHeight(pdfPage);
         FPDF_TEXTPAGE textPage = d_func()->m_textPage;
+        
+        int matchCount = 0;
         while (FPDFText_FindNext(schandle)) {
+            matchCount++;
             FPDF_SCHHANDLE sh = schandle;
             QVector<QRectF> region;//一个section对应的region
             int idx = FPDFText_GetSchResultIndex(sh);
@@ -1056,6 +1122,9 @@ QVector<DPdfGlobal::PageSection> DPdfPage::search(const QString &text, bool matc
             }
             sections.append(section);
         }
+        qDebug() << "Found" << matchCount << "matches";
+    } else {
+        qWarning() << "Failed to start search";
     }
 
     FPDFText_FindClose(schandle);