非托管C++程序中调用C#的dll

刚去的新公司分配了我一个项目需求，将PPT文件（包括*.ppt和*.pptx）转换成多张png图片。由于以前只有native C++的经验，在网上逛了多圈后，发现都是使用C#实现这个功能的，被这个需求折磨了几天后，今天终于把这个问题解决了。所以在此记录下解决这个项目需求的总结。

C#的程序代码在非托管的C++环境中使用有三种方式：1.平台调用技术（P/Invoke）。2. C++ Interop。3.COM Interop。

我使用的是C++ Interop方法，也就是使用C++/CLI语法将C#的动态库封装成C++/CLI的动态库，然后在native C++程序中就可以调用C++/CLI的动态库了。以下是我的一些做法：

1.我使用的IDE工具是VS2015，从网上找到了一份PPT转化成图片的C#动态库。链接如下：https://www.cnblogs.com/kksguijiao/articles/9099103.html

将这份C#的代码进行了一些简单的修改符合了我的需求。修改后的代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;using Aspose.Cells;using ESBasic;using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
//using System.Threading.Tasks;// 这个是去掉水印的
using System.Runtime.CompilerServices;
using System.Reflection;
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);}}}
}namespace pptToImage
{public class Class1{/// <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 void ConvertToImage_PPT(string originFilePath){string imageOutputDirPath = string.Empty;int startPageNum = 0, endPageNum = 0, resolution = 0;string Format = Path.GetExtension(originFilePath).ToLower();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ConvertToImage_PDF(tmpPdfPath, imageOutputDirPath, startPageNum, endPageNum, resolution);//删除pdf临时文件File.Delete(tmpPdfPath);return ;}catch (Exception ex){//ErrorHandler.WriteError(ex);//IErrorHandler.WriteError(ex);//IErrorHandler.WriteError(ex);Console.WriteLine(ex);return ;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 void ConvertToImage_PDF(string originFilePath, string imageOutputDirPath, int startPageNum, int endPageNum, int resolution){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).ToLower();string imgName = string.Empty;string newPath = Path.Combine(imageOutputDirPath, imageNamePrefix) + "/";// 创建目录路径if (!Directory.Exists(newPath)){Directory.CreateDirectory(newPath);}for (int i = startPageNum; i <= endPageNum; i++){MemoryStream stream = new MemoryStream();//string imgPath = Path.Combine(imageOutputDirPath, imageNamePrefix) + "_" + i.ToString("000") + ".jpg";string imgPath = newPath + (i-1).ToString("0") + ".png";// imgName += imgUrl + "/" + imageNamePrefix + "_" + i.ToString("000") + ".jpg|";imgName += newPath + (i-1).ToString("0") + ".png|";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.Png);img.Dispose();stream.Dispose();bm.Dispose();System.Threading.Thread.Sleep(200);}if (!string.IsNullOrEmpty(imgName)){imgName = imgName.Substring(0, imgName.Length - 1);}return ;}catch (Exception ex){// ErrorHandler.WriteError(ex);Console.WriteLine(ex);throw;}}}
}

在上面链接中下载Aspose的dll动态库，把这些动态库和我修改的代码一起编译，生成pptToImage.dll的C#动态库。

2. 新建C++/CLI的类库项目。截图如下：

我的C++/CLI的类库代码如下：

// ToCppDll_CsharpDll.h#pragma once//namespace ToCppDll_CsharpDll {
//
//  public ref class Class1
//  {
//      // TODO:  在此处添加此类的方法。
//
//  };
//}extern "C" __declspec(dllexport)
void ConvertToImage_PPT(char* originFilePath);// 这是主 DLL 文件。#include "stdafx.h"#include "ToCppDll_CsharpDll.h"
#include <string>using namespace System;using namespace Runtime::InteropServices;using namespace pptToImage;
using namespace LicenseHelper;__declspec(dllexport)
void ConvertToImage_PPT(char* originFilePath)
{LicenseHelper::ModifyInMemory::ActivateMemoryPatching();Class1 ^cls = gcnew Class1();String ^inputPath = gcnew String(originFilePath);cls->ConvertToImage_PPT(inputPath);}

编译以上代码，会生成ToCppDll_CsharpDll.dll，ToCppDll_CsharpDll.lib的动态库，在非托管 C++的环境中就可以使用这两个库了，当然上面生成的C#动态库和Aspose的动态库也都是需要。这个C++/CLI的ToCppDll_CsharpDll库相当于一个桥梁的作用，连接非托管的C++环境和.net 应用程序环境。这一步也是对C#的动态库进行封装，封装成了一个C++/CLI的动态库，非托管的C++程序中能够像调用普通的C/C++库一样调用这个库。

3. 这个是测试主程序了，不需要设置/clr。代码如下：


#include <stdio.h>
#include <stdlib.h>#include "../CppCliInclude/ToCppDll_CsharpDll.h"//#pragma  comment(lib,"ToCppDll_CsharpDll.lib")int main(int argc, char *argv[])
{char *pTemp = "C:/Users/tz100/Desktop/title.ppt";ConvertToImage_PPT(pTemp);getchar();return 0;
}

由于是刚刚接触这些C#，托管C++/CLI语言和VS IDE环境，导致我走了太多的弯路，浪费了许多的时间，心累了多次，终于有了上面的一点点收获，这或许是对自己最大的勉励吧。

注意事项：

1> 编译程序的时候注意引用C#动态库，C++/CLI库。

2> 如果还有问题先自己上网查查，实在解决不了再留言吧。

非托管C++程序中调用C#的dll相关推荐

利用c#实现远程注入非托管WIN32程序,并利用嵌入汇编调用非托管WIN32程序中的内部过程...
c#通过调用windows API函数,可以很轻松的完成非托管WIN32程序的注入.内存读写等操作,以下为c#实现远程注入非托管WIN32程序,并利用嵌入汇编调用非托管WIN32程序中的内部过程的源码 ...
本地方法（JNI）——从java 程序中调用C函数
[0]README 1) 本文部分文字描述转自 core java volume 2 , 旨在理解本地方法--从java 程序中调用C函数的基础知识 : 2) for source code, ...
[翻译]Kean' Blog 在一个.NET应用程序中调用AutoCAD
程序员通常要么整合功能到AutoCAD(利用其Plug-in结构,以增加命令,用户界面,对象等),或者调用它自动完成任务.显然,这两者之间的界限已经比较模糊,但是今天我们重点介绍第二类. 用于帮助理解 ...
在VB应用程序中调用Excel2000
Visual Basic简称(VB)是设计Windows应用程序强有力的开发工具,"全球绝大多数Windows应用程序都是用VB开发的": Excel是目前使用最广泛的办公应用软件 ...
Linux jsp php集成环境,ImageMagick在程序中调用(linux环境,jsp,php)
最近发现图片格式为cmyk时,图片上传浏览器不能正常显示,图片缩放会变成黑屏, 后来通过google发现imagemagick的功能很强大,安装可以采用两种方法,1)直接与php编译安装,在程序中调用 ...
SQL Server 2005 - 如何在预存程序中调用另外一个预存程序
要在一个预存程序中调用另外一个预存程序,可以使用下列两种方式之一进行调用: <?xml:namespace prefix = o /> EXECUTE <欲执行之预存程序的名称&g ...
在Delphi程序中调用控制面板设置功能
====================================================== 注:本文源代码点此下载 ================================= ...
安卓程序中调用 linux 命令
博客: 安卓之家微博: 追风917 CSDN: 蒋朋的家简书: 追风917 在研究串口 jni 开发的时候,遇到了这样一段代码: Process su;su = Runtime.getRuntim ...
iOS程序中调用系统自带应用(短信，邮件，浏览器，地图，appstore，拨打电话,iTunes，iBooks )...
在网上找到了下在记录下来以后方便用在程序中调用系统自带的应用,比如我进入程序的时候,希望直接调用safar来打开一个网页,下面是一个简单的使用: 查看更多iPhone应用程序的调用和第三方应用程序的 ...

非托管C++程序中调用C#的dll

非托管C++程序中调用C#的dll相关推荐

最新文章

热门文章