阅读目录
实现效果：
问题点：Adobe PDF Reader中并没有可以直接旋转的方法
解决办法：引入PdfiumViewer旋转PDF并保存替换当前的文件。
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实现效果：
PDF旋转功能
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问题点：Adobe PDF Reader中并没有可以直接旋转的方法
LoadFile 加载文件,文件URL地址
GotoFirstPage 到第一页
GotoLastPage 到最后一页
GotoPreviousPage 上一页
GotoNextPape 下一页
SetCurrentpage 到指定页
Setshowscrollbars 设置是否显示 Acrobat Reader的滚动条。带一个参数,该参数设为0时不显示滚动条,设为1时显示滚动条
SetshowToolbar 设置是否显示 Acrobat Reader的工具栏。带一个参数,该参数设为时不显示,设为1时显示。
Setview 设置显示效果。Fit：适应窗口大小； FitH：适合宽度
setZoom 设置文件的显示比例；默认是100
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解决办法：引入PdfiumViewer旋转PDF并保存替换当前的文件。
///
/// 旋转保存PDF文件并释放文件锁定
///
///
///
///
///
public bool SafeSavePdfWithRelease(AxAcroPDFLib.AxAcroPDF axControl, string filePath, PdfRotation pdfRotation)
{
const int MAX_RETRY = 3;
const int RETRY_DELAY = 500;
for (int attempt = 0; attempt < MAX_RETRY; attempt++){try{// 步骤1：创建临时副本string tempPath = Path.GetTempFileName().Replace(".tmp", ".pdf");File.Copy(filePath, tempPath, true);// 步骤2：使用内存流操作using (var ms = new MemoryStream(File.ReadAllBytes(tempPath)))using (var document = PdfiumViewer.PdfDocument.Load(ms)){for (int pageIndex = 0; pageIndex < document.PageCount; pageIndex++){document.RotatePage(pageIndex, pdfRotation);// 可选：验证旋转结果// var currentRotation = document.Pages[pageIndex].Rotation;// Debug.Assert(currentRotation == (int)rotation);}// 执行修改操作（示例：旋转第一页）//document.RotatePage(1, PdfRotation.Rotate90);// 步骤3：保存到临时文件byte[] pdfBytes;using (var outputStream = new MemoryStream()){document.Save(outputStream);pdfBytes = outputStream.ToArray();}// 步骤4：强制释放文件锁定ForceReleasePdfFile(axControl, filePath);// 步骤5：原子替换文件File.WriteAllBytes(tempPath, pdfBytes);// File.Replace(tempPath, filePath, null, true);// 1. 复制替换文件到目标路径File.Copy(tempPath, filePath, overwrite: true);// 2. 删除临时文件（可选）File.Delete(tempPath);// 步骤6：验证加载axControl.LoadFile(filePath);return true;}}catch (IOException ex) when (ex.HResult == -2147024864){if (attempt == MAX_RETRY - 1) throw;Thread.Sleep(RETRY_DELAY);}}return false;
}
public void ForceReleasePdfFile(AxAcroPDFLib.AxAcroPDF axControl, string filePath)
{// 步骤1：深度释放COM对象ReleaseComObject(axControl);// 步骤2：内核级文件解锁UnlockFileHandle(filePath);// 步骤3：延迟重载验证Thread.Sleep(200);axControl.LoadFile(filePath);
}private void ReleaseComObject(AxAcroPDFLib.AxAcroPDF axControl)
{try{// 显式释放ActiveX资源if (axControl.IsDisposed) return;// 反射调用内部释放方法var type = axControl.GetType();var method = type.GetMethod("ReleaseOCX", BindingFlags.Instance | BindingFlags.NonPublic);method?.Invoke(axControl, null);// 强制垃圾回收GC.Collect();GC.WaitForPendingFinalizers();}catch (Exception ex){}
}
// 修改后的P/Invoke声明
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern IntPtr CreateFile(string lpFileName,uint dwDesiredAccess,uint dwShareMode,IntPtr lpSecurityAttributes,FileMode dwCreationDisposition, // 改用.NET枚举FileAttributes dwFlagsAndAttributes, // 改用.NET枚举IntPtr hTemplateFile);// 修改后的UnlockFileHandle方法
private void UnlockFileHandle(string filePath)
{const uint FILE_SHARE_READ = 0x00000001;const uint FILE_SHARE_WRITE = 0x00000002;const uint GENERIC_READ = 0x80000000;IntPtr hFile = CreateFile(filePath,GENERIC_READ,FILE_SHARE_READ | FILE_SHARE_WRITE,IntPtr.Zero,FileMode.Open, // 对应原生OPEN_EXISTINGFileAttributes.Normal, // 对应原生FILE_ATTRIBUTE_NORMALIntPtr.Zero);if (hFile != IntPtr.Zero && hFile != new IntPtr(-1)){CloseHandle(hFile);}
}[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool CloseHandle(IntPtr hObject);`
调用代码：
/// <summary>/// 当前旋转角度/// </summary>public static int currentRotation = 0;/// <summary>/// 逆时针旋转/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void pictureEdit3_Click(object sender, EventArgs e){if (axAcroPDF1.Visible){currentRotation -= 90; PdfRotation pdfRotation = GetCounterClockwiseRotation(currentRotation);var path = axAcroPDF1.src;//调用旋转PDF保存方法SafeSavePdfWithRelease(axAcroPDF1, path,pdfRotation); axAcroPDF1.LoadFile(path);axAcroPDF1.setView("Fit"); //适应窗口大小}}/// <summary>/// 顺时针旋转/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void pictureEdit2_Click(object sender, EventArgs e){if (axAcroPDF1.Visible){currentRotation += 90; PdfRotation pdfRotation = GetCounterClockwiseRotation(currentRotation);var path = axAcroPDF1.src;//调用旋转PDF保存方法SafeSavePdfWithRelease(axAcroPDF1, path, pdfRotation);axAcroPDF1.LoadFile(path);axAcroPDF1.setView("Fit"); //适应窗口大小 }}/// <summary>/// 通过旋转度数计算旋转的角度/// </summary>/// <param name="counterClockwiseDegrees">当前旋转角度</param>public static PdfRotation GetCounterClockwiseRotation(int counterClockwiseDegrees){const int fullCircle = 360;int effectiveDegrees = counterClockwiseDegrees % fullCircle;if (effectiveDegrees < 0) effectiveDegrees += fullCircle; // 处理负角度if (currentRotation >= 360) {currentRotation = 0;}if (currentRotation <= -360) {currentRotation = 0;}switch (effectiveDegrees){case 90:return PdfRotation.Rotate90; case 180:return PdfRotation.Rotate180;case 270:return PdfRotation.Rotate270;case 0:default:return PdfRotation.Rotate0;}}/// <summary>