先添加一个处理CS类
using System.IO;
using iTextSharp.text.pdf;
using System;
using iTextSharp.text;
using System.Runtime.InteropServices;
using System.Collections;
using System.Drawing.Imaging;
namespace Aspose.Words
{
public class PDF
{
public class ToPics
{
#region GhostScript Import
/// <summary>Create a new instance of Ghostscript. This instance is passed to most other gsapi functions. The caller_handle will be provided to callback functions.
/// At this stage, Ghostscript supports only one instance. </summary>
/// <param name="pinstance"></param>
/// <param name="caller_handle"></param>
/// <returns></returns>
[DllImport("gsdll32.dll", EntryPoint = "gsapi_new_instance")]
private static extern int gsapi_new_instance(out IntPtr pinstance, IntPtr caller_handle);
/// <summary>This is the important function that will perform the conversion</summary>
/// <param name="instance"></param>
/// <param name="argc"></param>
/// <param name="argv"></param>
/// <returns></returns>
[DllImport("gsdll32.dll", EntryPoint = "gsapi_init_with_args")]
private static extern int gsapi_init_with_args(IntPtr instance, int argc, IntPtr argv);
/// <summary>
/// Exit the interpreter. This must be called on shutdown if gsapi_init_with_args() has been called, and just before gsapi_delete_instance().
/// </summary>
/// <param name="instance"></param>
/// <returns></returns>
[DllImport("gsdll32.dll", EntryPoint = "gsapi_exit")]
private static extern int gsapi_exit(IntPtr instance);
/// <summary>
/// Destroy an instance of Ghostscript. Before you call this, Ghostscript must have finished. If Ghostscript has been initialised, you must call gsapi_exit before gsapi_delete_instance.
/// </summary>
/// <param name="instance"></param>
[DllImport("gsdll32.dll", EntryPoint = "gsapi_delete_instance")]
private static extern void gsapi_delete_instance(IntPtr instance);
#endregion
#region Variables
private string _sDeviceFormat;
private int _iWidth;
private int _iHeight;
private int _iResolutionX;
private int _iResolutionY;
private int _iJPEGQuality;
private Boolean _bFitPage;
private IntPtr _objHandle;
#endregion
#region Proprieties
public string OutputFormat
{
get { return _sDeviceFormat; }
set { _sDeviceFormat = value; }
}
public int Width
{
get { return _iWidth; }
set { _iWidth = value; }
}
public int Height
{
get { return _iHeight; }
set { _iHeight = value; }
}
public int ResolutionX
{
get { return _iResolutionX; }
set { _iResolutionX = value; }
}
public int ResolutionY
{
get { return _iResolutionY; }
set { _iResolutionY = value; }
}
public Boolean FitPage
{
get { return _bFitPage; }
set { _bFitPage = value; }
}
/// <summary>Quality of compression of JPG</summary>
public int JPEGQuality
{
get { return _iJPEGQuality; }
set { _iJPEGQuality = value; }
}
#endregion
#region Init
public ToPics(IntPtr objHandle)
{
_objHandle = objHandle;
}
public ToPics()
{
_objHandle = IntPtr.Zero;
}
#endregion
private byte[] StringToAnsiZ(string str)
{
int intElementCount;
int intCounter;
byte[] aAnsi;
byte bChar;
intElementCount = str.Length;
aAnsi = new byte[intElementCount + 1];
for (intCounter = 0; intCounter < intElementCount; intCounter++)
{
bChar = (byte)str[intCounter];
aAnsi[intCounter] = bChar;
}
aAnsi[intElementCount] = 0;
return aAnsi;
}
public void ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, Definition definition)
{
if (!Directory.Exists(imageOutputPath))
{
Directory.CreateDirectory(imageOutputPath);
}
// validate pageNum
if (startPageNum <= 0)
{
startPageNum = 1;
}
if (endPageNum <= 0)
{
endPageNum = 1;
}
if (startPageNum > endPageNum)
{
int tempPageNum = startPageNum;
startPageNum = endPageNum;
endPageNum = startPageNum;
}
// start to convert each page
for (int i = startPageNum; i <= endPageNum; i++)
{
this.Convert(pdfInputPath, imageOutputPath + imageName + i.ToString() + ".jpg", i, i, "jpeg", 100 * (int)definition, 100 * (int)definition);
}
}
/// <summary>Convert the file!</summary>
private void Convert(string inputFile, string outputFile,
int firstPage, int lastPage, string deviceFormat, int width, int height)
{
//Avoid to work when the file doesn't exist
if (!System.IO.File.Exists(inputFile))
{
//System.Windows.Forms.MessageBox.Show(string.Format("The file :'{0}' doesn't exist", inputFile));
return;
}
int intReturn;
IntPtr intGSInstanceHandle;
object[] aAnsiArgs;
IntPtr[] aPtrArgs;
GCHandle[] aGCHandle;
int intCounter;
int intElementCount;
IntPtr callerHandle;
GCHandle gchandleArgs;
IntPtr intptrArgs;
string[] sArgs = GetGeneratedArgs(inputFile, outputFile,
firstPage, lastPage, deviceFormat, width, height);
// Convert the Unicode strings to null terminated ANSI byte arrays
// then get pointers to the byte arrays.
intElementCount = sArgs.Length;
aAnsiArgs = new object[intElementCount];
aPtrArgs = new IntPtr[intElementCount];
aGCHandle = new GCHandle[intElementCount];
// Create a handle for each of the arguments after
// they've been converted to an ANSI null terminated
// string. Then store the pointers for each of the handles
for (intCounter = 0; intCounter < intElementCount; intCounter++)
{
aAnsiArgs[intCounter] = StringToAnsiZ(sArgs[intCounter]);
aGCHandle[intCounter] = GCHandle.Alloc(aAnsiArgs[intCounter], GCHandleType.Pinned);
aPtrArgs[intCounter] = aGCHandle[intCounter].AddrOfPinnedObject();
}
// Get a new handle for the array of argument pointers
gchandleArgs = GCHandle.Alloc(aPtrArgs, GCHandleType.Pinned);
intptrArgs = gchandleArgs.AddrOfPinnedObject();
intReturn = gsapi_new_instance(out intGSInstanceHandle, _objHandle);
callerHandle = IntPtr.Zero;
try
{
intReturn = gsapi_init_with_args(intGSInstanceHandle, intElementCount, intptrArgs);
}
catch (Exception ex)
{
//System.Windows.Forms.MessageBox.Show(ex.Message);
}
finally
{
for (intCounter = 0; intCounter < intReturn; intCounter++)
{
aGCHandle[intCounter].Free();
}
gchandleArgs.Free();
gsapi_exit(intGSInstanceHandle);
gsapi_delete_instance(intGSInstanceHandle);
}
}
private string[] GetGeneratedArgs(string inputFile, string outputFile,
int firstPage, int lastPage, string deviceFormat, int width, int height)
{
this._sDeviceFormat = deviceFormat;
this._iResolutionX = width;
this._iResolutionY = height;
// Count how many extra args are need - HRangel - 11/29/2006, 3:13:43 PM
ArrayList lstExtraArgs = new ArrayList();
if (_sDeviceFormat == "jpg" && _iJPEGQuality > 0 && _iJPEGQuality < 101)
lstExtraArgs.Add("-dJPEGQ=" + _iJPEGQuality);
if (_iWidth > 0 && _iHeight > 0)
lstExtraArgs.Add("-g" + _iWidth + "x" + _iHeight);
if (_bFitPage)
lstExtraArgs.Add("-dPDFFitPage");
if (_iResolutionX > 0)
{
if (_iResolutionY > 0)
lstExtraArgs.Add("-r" + _iResolutionX + "x" + _iResolutionY);
else
lstExtraArgs.Add("-r" + _iResolutionX);
}
// Load Fixed Args - HRangel - 11/29/2006, 3:34:02 PM
int iFixedCount = 17;
int iExtraArgsCount = lstExtraArgs.Count;
string[] args = new string[iFixedCount + lstExtraArgs.Count];
/*
// Keep gs from writing information to standard output
"-q",
"-dQUIET",
"-dPARANOIDSAFER", // Run this command in safe mode
"-dBATCH", // Keep gs from going into interactive mode
"-dNOPAUSE", // Do not prompt and pause for each page
"-dNOPROMPT", // Disable prompts for user interaction
"-dMaxBitmap=500000000", // Set high for better performance
// Set the starting and ending pages
String.Format("-dFirstPage={0}", firstPage),
String.Format("-dLastPage={0}", lastPage),
// Configure the output anti-aliasing, resolution, etc
"-dAlignToPixels=0",
"-dGridFitTT=0",
"-sDEVICE=jpeg",
"-dTextAlphaBits=4",
"-dGraphicsAlphaBits=4",
*/
args[0] = "pdf2img";//this parameter have little real use
args[1] = "-dNOPAUSE";//I don't want interruptions
args[2] = "-dBATCH";//stop after
//args[3]="-dSAFER";
args[3] = "-dPARANOIDSAFER";
args[4] = "-sDEVICE=" + _sDeviceFormat;//what kind of export format i should provide
args[5] = "-q";
args[6] = "-dQUIET";
args[7] = "-dNOPROMPT";
args[8] = "-dMaxBitmap=500000000";
args[9] = String.Format("-dFirstPage={0}", firstPage);
args[10] = String.Format("-dLastPage={0}", lastPage);
args[11] = "-dAlignToPixels=0";
args[12] = "-dGridFitTT=0";
args[13] = "-dTextAlphaBits=4";
args[14] = "-dGraphicsAlphaBits=4";
//For a complete list watch here:
//http://pages.cs.wisc.edu/~ghost/doc/cvs/Devices.htm
//Fill the remaining parameters
for (int i = 0; i < iExtraArgsCount; i++)
{
args[15 + i] = (string)lstExtraArgs[i];
}
//Fill outputfile and inputfile
args[15 + iExtraArgsCount] = string.Format("-sOutputFile={0}", outputFile);
args[16 + iExtraArgsCount] = string.Format("{0}", inputFile);
return args;
}
public enum Definition
{
One = 1, Two = 2, Three = 3, Four = 4, Five = 5, Six = 6, Seven = 7, Eight = 8, Nine = 9, Ten = 10
}
}
}
}
直接调用即可
string path = Application.StartupPath + "\\";
string aname = path + "test.pdf";
string oupfile = path + "result";
Aspose.Words.PDF.ToPics C = new Aspose.Words.PDF.ToPics();
int pc = 2; //一直转换到第几页
C.ConvertPDF2Image(aname, path, oupfile, 1, pc, ImageFormat.Jpeg, Aspose.Words.PDF.ToPics.Definition.One);
for (int k = 1; k < pc + 1; k++)
{
File.Copy(path + newfilename + k + ".jpg", path + "\\" + newfilenameview + k + ".jpg", true);
Application.DoEvents();
File.Delete(path + newfilename + k + ".jpg");
}
File.Delete(tempname)；
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