PPT,Word,Excel,PDF,TXT转换图片

 Aspose组件下载连接：http://pan.baidu.com/s/1slG2SdJ

 1.所有的转换图片都要调用Aspose组件，在执行线程之前要先加上  LicenseHelper.ModifyInMemory.ActivateMemoryPatching();

//进入线程执行转换图片的方法
UploaderCalculators.Add(filePath, fileType, Id.ToString(), UId.ToString(), Server.MapPath(imgUrl), imgUrl);

 类名：UploaderCalculators

 public class UploaderCalculators
    {

        //存入任务的队列
        private static Queue<string> _urlQueue;
        private static Queue<string> _typeQueue;
        private static Queue<string> _KcidQueue;
        private static Queue<string> _UserIdQueue;
        private static Queue<string> _imgUrlQueue;
        private static Queue<string> _imgQueue;
        private static ManualResetEvent _hasNew;
        private static bool isFirst = true;

        static UploaderCalculators()
        {
            _urlQueue = new Queue<string>();
            _typeQueue = new Queue<string>();
            _KcidQueue = new Queue<string>();
            _UserIdQueue = new Queue<string>();
            _imgUrlQueue = new Queue<string>();
            _imgQueue = new Queue<string>();
            _hasNew = new ManualResetEvent(false);

            //这里创建一个线程，使其执行Process方法。
            Thread thread = new Thread(Process);

            //设置当前线程为后台线程。
            thread.IsBackground = true;

            //开启线程
            thread.Start();
        }

        private static void Process()
        {
            while (true)
            {
                //等待接受信号，阻塞线程
                _hasNew.WaitOne();

                //接收信号，重置 信号器，信号关闭。
                _hasNew.Reset();

                threadStart();
            }
        }

        private static void threadStart()
        {
            CommonBll comm = new CommonBll();
            BaseController Base = new BaseController();
            while (true)
            {
                if (_urlQueue.Count > 0 && _typeQueue.Count > 0 && _KcidQueue.Count > 0 && _UserIdQueue.Count > 0)
                {
                    try
                    {
                        //文件路径
                        string Url = _urlQueue.Count > 0 ? _urlQueue.Dequeue() : "";//从队列的开始出返回一个对象;
                        //文件后缀名
                        string fileType = _typeQueue.Count > 0 ? _typeQueue.Dequeue() : "";//从队列的开始出返回一个对象;//转换图片后的存入路径
                        string imgUrl = _imgUrlQueue.Count > 0 ? _imgUrlQueue.Dequeue() : "";//从队列的开始出返回一个对象;
                        //
                        string img = _imgQueue.Count > 0 ? _imgQueue.Dequeue() : "";//从队列的开始出返回一个对象;
                        PictureConversion pc = new PictureConversion();

                        string imgName = string.Empty;
                        if (fileType == "docx" || fileType == "doc")
                        {
                            imgName = pc.ConvertToImage_Words(Url, imgUrl, 0, 0, null, 145, img);
                        }
                        if (fileType == "pptx" || fileType == "xlsx" || fileType == "xls" || fileType == "excel" || fileType == "excelx" || fileType == "ppt")
                        {
                            imgName = pc.ConvertToImage_PPT(Url, imgUrl, 0, 0, 145, fileType, img);
                        }
                        if (fileType == "pdf")
                        {
                            imgName = pc.ConvertToImage_PDF(Url, imgUrl, 0, 0, 145, img);
                        }
                        if (imgName != null && imgName != "")
                        {
                           //
                        }
                    }
                    catch (Exception e)
                    {
                        Console.Write(e);
                    }
                }
            }
        }


        public static void Add(string Url, string Type, string KcId, string UserId, string imgUrl, string img)
        {
            _urlQueue.Enqueue(Url);
            _typeQueue.Enqueue(Type);
            _KcidQueue.Enqueue(KcId);
            _UserIdQueue.Enqueue(UserId);
            _imgUrlQueue.Enqueue(imgUrl);
            _imgQueue.Enqueue(img);
            if (isFirst)
            {
                isFirst = false;
                _hasNew.Set();
            }
        }


        
    }

类名：PictureConversion

public class PictureConversion
{
/// <summary>
/// 将Word文档转换为图片的方法
/// </summary>
/// <param name="wordInputPath">Word文件路径</param>
/// <param name="imageOutputDirPath">图片输出路径，如果为空，默认值为Word所在路径</param>
/// <param name="startPageNum">从PDF文档的第几页开始转换，如果为0，默认值为1</param>
/// <param name="endPageNum">从PDF文档的第几页开始停止转换，如果为0，默认值为Word总页数</param>
/// <param name="imageFormat">设置所需图片格式，如果为null，默认格式为PNG</param>
/// <param name="resolution">设置图片的像素，数字越大越清晰，如果为0，默认值为128，建议最大值不要超过1024</param>
public string ConvertToImage_Words(string wordInputPath, string imageOutputDirPath, int startPageNum, int endPageNum, ImageFormat imageFormat, int resolution, string imgUrl)
{
try
{
Aspose.Words.Document doc = new Aspose.Words.Document(wordInputPath);

if (doc == null)
{
throw new Exception("Word文件无效或者Word文件被加密！");
}

if (imageOutputDirPath.Trim().Length == 0)
{
imageOutputDirPath = Path.GetDirectoryName(wordInputPath);
}

if (!Directory.Exists(imageOutputDirPath))
{
Directory.CreateDirectory(imageOutputDirPath);
}

if (startPageNum <= 0)
{
startPageNum = 1;
}

if (endPageNum > doc.PageCount || endPageNum <= 0)
{
endPageNum = doc.PageCount;
}

if (startPageNum > endPageNum)
{
int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum;
}

if (imageFormat == null)
{
imageFormat = ImageFormat.Png;
}

if (resolution <= 0)
{
resolution = 128;
}

string imageName = Path.GetFileNameWithoutExtension(wordInputPath);
Aspose.Words.Saving.ImageSaveOptions imageSaveOptions = new Aspose.Words.Saving.ImageSaveOptions(Aspose.Words.SaveFormat.Png);
imageSaveOptions.Resolution = resolution;
string imgName = string.Empty;
for (int i = startPageNum; i <= endPageNum; i++)
{
MemoryStream stream = new MemoryStream();
imageSaveOptions.PageIndex = i - 1;
string imgPath = Path.Combine(imageOutputDirPath, imageName) + "_" + i.ToString("000") + "." + imageFormat.ToString();
imgName += imgUrl + "/" + imageName + "_" + i.ToString("000") + "." + imageFormat.ToString() + "|";
doc.Save(stream, imageSaveOptions);
System.Drawing.Image img = System.Drawing.Image.FromStream(stream);
System.Drawing.Bitmap bm = ESBasic.Helpers.ImageHelper.Zoom(img, 0.6f);
bm.Save(imgPath, imageFormat);
img.Dispose();
stream.Dispose();
bm.Dispose();
System.Threading.Thread.Sleep(200);
}
if (!string.IsNullOrEmpty(imgName))
{
imgName = imgName.Substring(0, imgName.Length - 1);
}
return imgName;
}

catch (Exception ex)
{
ErrorHandler.WriteError(ex);
throw;
}
}

/// <summary>
/// 将PPT、Excel、Txt文档转换为图片的方法
/// </summary>
/// <param name="originFilePath">ppt文件路径</param>
/// <param name="imageOutputDirPath">图片输出路径，如果为空，默认值为pdf所在路径</param>
/// <param name="startPageNum">从PDF文档的第几页开始转换，如果为0，默认值为1</param>
/// <param name="endPageNum">从PDF文档的第几页开始停止转换，如果为0，默认值为pdf总页数</param>
/// <param name="resolution">设置图片的像素，数字越大越清晰，如果为0，默认值为128，建议最大值不要超过1024</param>
public string ConvertToImage_PPT(string originFilePath, string imageOutputDirPath, int startPageNum, int endPageNum, int resolution, string Format, string imgUrl)
{
try
{
//先将文件转换为pdf临时文件
string tmpPdfPath = originFilePath.Replace(Format, "") + "pdf";
if (Format == ".xls" || Format == ".xlsx" || Format == ".txt")
{
Workbook wb = new Workbook(originFilePath);
wb.Save(tmpPdfPath, SaveFormat.Pdf);
}
else
{
Aspose.Slides.Presentation doc = new Aspose.Slides.Presentation(originFilePath);
if (doc == null)
{
throw new Exception("ppt文件无效或者ppt文件被加密！");
}

if (imageOutputDirPath.Trim().Length == 0)
{
imageOutputDirPath = Path.GetDirectoryName(originFilePath);
}

if (!Directory.Exists(imageOutputDirPath))
{
Directory.CreateDirectory(imageOutputDirPath);
}

if (startPageNum <= 0)
{
startPageNum = 1;
}

if (endPageNum > doc.Slides.Count || endPageNum <= 0)
{
endPageNum = doc.Slides.Count;
}

if (startPageNum > endPageNum)
{
int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum;
}

if (resolution <= 0)
{
resolution = 128;
}
if (doc != null)
{
doc.Save(tmpPdfPath, Aspose.Slides.Export.SaveFormat.Pdf);
}
}

//再将pdf转换为图片
string imgName = ConvertToImage_PDF(tmpPdfPath, imageOutputDirPath, startPageNum, endPageNum, resolution, imgUrl);
//删除pdf临时文件
File.Delete(tmpPdfPath);
return imgName;
}
catch (Exception ex)
{
ErrorHandler.WriteError(ex);
return "888";
throw;
}
}

/// <summary>
/// 将pdf文档转换为图片的方法
/// </summary>
/// <param name="originFilePath">pdf文件路径</param>
/// <param name="imageOutputDirPath">图片输出路径，如果为空，默认值为pdf所在路径</param>
/// <param name="startPageNum">从PDF文档的第几页开始转换，如果为0，默认值为1</param>
/// <param name="endPageNum">从PDF文档的第几页开始停止转换，如果为0，默认值为pdf总页数</param>
/// <param name="resolution">设置图片的像素，数字越大越清晰，如果为0，默认值为128，建议最大值不要超过1024</param>
public string ConvertToImage_PDF(string originFilePath, string imageOutputDirPath, int startPageNum, int endPageNum, int resolution, string imgUrl)
{
try
{
Aspose.Pdf.Document doc = new Aspose.Pdf.Document(originFilePath);

if (doc == null)
{
throw new Exception("pdf文件无效或者pdf文件被加密！");
}

if (imageOutputDirPath.Trim().Length == 0)
{
imageOutputDirPath = Path.GetDirectoryName(originFilePath);
}

if (!Directory.Exists(imageOutputDirPath))
{
Directory.CreateDirectory(imageOutputDirPath);
}

if (startPageNum <= 0)
{
startPageNum = 1;
}

if (endPageNum > doc.Pages.Count || endPageNum <= 0)
{
endPageNum = doc.Pages.Count;
}

if (startPageNum > endPageNum)
{
int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum;
}

if (resolution <= 0)
{
resolution = 128;
}

string imageNamePrefix = Path.GetFileNameWithoutExtension(originFilePath);
string imgName = string.Empty;
for (int i = startPageNum; i <= endPageNum; i++)
{
MemoryStream stream = new MemoryStream();
string imgPath = Path.Combine(imageOutputDirPath, imageNamePrefix) + "_" + i.ToString("000") + ".jpg";
imgName += imgUrl + "/" + imageNamePrefix + "_" + i.ToString("000") + ".jpg|";
Aspose.Pdf.Devices.Resolution reso = new Aspose.Pdf.Devices.Resolution(resolution);
Aspose.Pdf.Devices.JpegDevice jpegDevice = new Aspose.Pdf.Devices.JpegDevice(reso, 100);
jpegDevice.Process(doc.Pages[i], stream);

Image img = Image.FromStream(stream);
Bitmap bm = ESBasic.Helpers.ImageHelper.Zoom(img, 0.6f);
bm.Save(imgPath, ImageFormat.Jpeg);
img.Dispose();
stream.Dispose();
bm.Dispose();
System.Threading.Thread.Sleep(200);
}
if (!string.IsNullOrEmpty(imgName))
{
imgName = imgName.Substring(0, imgName.Length - 1);
}

return imgName;
}
catch (Exception ex)
{
ErrorHandler.WriteError(ex);
throw;
}
}

}

 类名：ModifyInMenory

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;
using System.Xml;


namespace LicenseHelper
{
    public static class ModifyInMemory
    {
        private static string AsposeList = "Aspose.3D.dll, Aspose.BarCode.dll, Aspose.BarCode.Compact.dll, Aspose.BarCode.WPF.dll, Aspose.Cells.GridDesktop.dll, Aspose.Cells.GridWeb.dll, Aspose.CAD.dll, Aspose.Cells.dll, Aspose.Diagram.dll, Aspose.Email.dll, Aspose.Imaging.dll, Aspose.Note.dll, Aspose.OCR.dll, Aspose.Pdf.dll, Aspose.Slides.dll, Aspose.Tasks.dll, Aspose.Words.dll";

        public static void ActivateMemoryPatching()
        {
            Assembly[] arr = AppDomain.CurrentDomain.GetAssemblies();
            foreach (Assembly assembly in arr)
            {
                if (AsposeList.IndexOf(assembly.FullName.Split(',')[0] + ".dll") != -1)
                    ActivateForAssembly(assembly);
            }
            AppDomain.CurrentDomain.AssemblyLoad += new AssemblyLoadEventHandler(ActivateOnLoad);
        }

        private static void ActivateOnLoad(object sender, AssemblyLoadEventArgs e)
        {
            if (AsposeList.IndexOf(e.LoadedAssembly.FullName.Split(',')[0] + ".dll") != -1)
                ActivateForAssembly(e.LoadedAssembly);
        }

        private static void ActivateForAssembly(Assembly assembly)
        {
            MethodInfo miLicensed1 = typeof(ModifyInMemory).GetMethod("InvokeMe1", BindingFlags.NonPublic | BindingFlags.Static);
            MethodInfo miLicensed2 = typeof(ModifyInMemory).GetMethod("InvokeMe2", BindingFlags.NonPublic | BindingFlags.Static);
            MethodInfo miEvaluation = null;

            Dictionary<string, MethodInfo> miDict = new Dictionary<string, MethodInfo>()
            {
                {"System.DateTime"      , miLicensed1},
                {"System.Xml.XmlElement", miLicensed2}
            };

            Type[] arrType = null;
            bool isFound = false;
            int nCount = 0;

            try
            {
                arrType = assembly.GetTypes();
            }
            catch (ReflectionTypeLoadException err)
            {
                arrType = err.Types;
            }


            foreach (Type type in arrType)
            {
                if (isFound) break;

                if (type == null) continue;

                MethodInfo[] arrMInfo = type.GetMethods(BindingFlags.NonPublic | BindingFlags.Static);

                foreach (MethodInfo info in arrMInfo)
                {
                    if (isFound) break;

                    try
                    {
                        string strMethod = info.ToString();
                        if ((strMethod.IndexOf("(System.Xml.XmlElement, System.String)") > 0) && (miDict.ContainsKey(info.ReturnType.ToString())))
                        {
                            miEvaluation = info;
                            MemoryPatching(miEvaluation, miDict[miEvaluation.ReturnType.ToString()]);
                            nCount++;

                            if (((assembly.FullName.IndexOf("Aspose.Pdf") == -1) && (nCount == 2)) ||
                                ((assembly.FullName.IndexOf("Aspose.Pdf") != -1) && (nCount == 6)))
                            {
                                isFound = true;
                                break;
                            }
                        }
                    }
                    catch
                    {
                        throw new InvalidOperationException("MemoryPatching for "" + assembly.FullName + "" failed !");
                    }
                }
            }

            String[] aParts = assembly.FullName.Split(',');
            string fName = aParts[0];
            if (fName.IndexOf("Aspose.BarCode.") != -1)
                fName = "Aspose.BarCode";
            else if (fName.IndexOf("Aspose.3D") != -1)
                fName = "Aspose.ThreeD";

            try
            {
                Type type2 = assembly.GetType(fName + ".License");
                MethodInfo mi = type2.GetMethod("SetLicense", new Type[] { typeof(Stream) });
                string LData = "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";
                Stream stream = new MemoryStream(Convert.FromBase64String(LData));
                stream.Seek(0, SeekOrigin.Begin);
                mi.Invoke(Activator.CreateInstance(type2, null), new Stream[] { stream });
            }
            catch
            {
                //throw new InvalidOperationException("SetLicense for "" + assembly.FullName + "" failed !");
            }

        }


        private static DateTime InvokeMe1(XmlElement element, string name)
        {
            return DateTime.MaxValue;
        }


        private static XmlElement InvokeMe2(XmlElement element, string name)
        {
            if (element.LocalName == "License")
            {
                string License64 = "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";
                element.InnerXml = new UTF8Encoding().GetString(Convert.FromBase64String(License64));
            }

            if (element.LocalName == "BlackList")
            {
                string BlackList64 = "PERhdGE+PC9EYXRhPjxTaWduYXR1cmU+cUJwMEx1cEVoM1ZnOWJjeS8vbUVXUk9KRWZmczRlY25iTHQxYlNhanU2NjY5RHlad09FakJ1eEdBdVBxS1hyd0x5bmZ5VWplYUNGQ0QxSkh2RVUxVUl5eXJOTnBSMXc2NXJIOUFyUCtFbE1lVCtIQkZ4NFMzckFVMnd6dkxPZnhGeU9DQ0dGQ2UraTdiSHlGQk44WHp6R1UwdGRPMGR1RTFoRTQ5M1RNY3pRPTwvU2lnbmF0dXJlPg==";
                element.InnerXml = new UTF8Encoding().GetString(Convert.FromBase64String(BlackList64));
            }

            XmlNodeList elementsByTagName = element.GetElementsByTagName(name);
            if (elementsByTagName.Count <= 0)
            {
                return null;
            }

            return (XmlElement)elementsByTagName[0];
        }


        private static unsafe void MemoryPatching(MethodBase miEvaluation, MethodBase miLicensed)
        {
            IntPtr IntPtrEval = GetMemoryAddress(miEvaluation);
            IntPtr IntPtrLicensed = GetMemoryAddress(miLicensed);

            if (IntPtr.Size == 8)
                *((long*)IntPtrEval.ToPointer()) = *((long*)IntPtrLicensed.ToPointer());
            else
                *((int*)IntPtrEval.ToPointer()) = *((int*)IntPtrLicensed.ToPointer());

        }


        private static unsafe IntPtr GetMemoryAddress(MethodBase mb)
        {
            RuntimeHelpers.PrepareMethod(mb.MethodHandle);

            if ((Environment.Version.Major >= 4) || ((Environment.Version.Major == 2) && (Environment.Version.MinorRevision >= 3053)))
            {
                return new IntPtr(((int*)mb.MethodHandle.Value.ToPointer() + 2));
            }

            UInt64* location = (UInt64*)(mb.MethodHandle.Value.ToPointer());
            int index = (int)(((*location) >> 32) & 0xFF);
            if (IntPtr.Size == 8)
            {
                ulong* classStart = (ulong*)mb.DeclaringType.TypeHandle.Value.ToPointer();
                ulong* address = classStart + index + 10;
                return new IntPtr(address);
            }
            else
            {
                uint* classStart = (uint*)mb.DeclaringType.TypeHandle.Value.ToPointer();
                uint* address = classStart + index + 10;
                return new IntPtr(address);
            }
        }
    }
}