我正在尝试学习如何编写C#DLL并从MFC应用程序中调用它。
这是一些DLL代码:
using System;
using System.IO;
using System.Xml.Serialization;
namespace MSATools
{
public class MSAToolsLibrary
{
public MSAToolsLibrary()
{
_PublisherData = new PublisherData();
}
[XmlIgnore]
private string _strPathXML;
public void SetPathXML(String strPathXML)
{
_strPathXML = strPathXML;
}
[XmlIgnore]
private PublisherData _PublisherData;
public void SavePublisherData()
{
XmlSerializer x = new XmlSerializer(_PublisherData.GetType());
using (StreamWriter writer = new StreamWriter(_strPathXML))
{
x.Serialize(writer, _PublisherData);
}
}
public void ReadPublisherData()
{
_PublisherData.Publishers.Clear(); // Reset
XmlSerializer x = new XmlSerializer(_PublisherData.GetType());
using (StreamReader reader = new StreamReader(_strPathXML))
{
_PublisherData = (PublisherData)x.Deserialize(reader);
}
}
public void AddPublisherData()
{
_PublisherData.AddStudent("Andrew", "Andrew notes");
_PublisherData.AddStudent("Rachel", "Rachel notes");
_PublisherData.AddStudent("Joshua", "Joshua notes");
_PublisherData.AddStudent("Finlay", "Finlay notes");
}
}
}
我勾选了将其注册为互操作性的选项,并且我有TLB文件。
然后,我进入了一个新的MFC项目,并按照教程从TLB文件创建类。但它创建的只是:
// Machine generated IDispatch wrapper class(es) created with Add Class from Typelib Wizard
#import "D:\\My Programs\\2017\\MSATools\\MSATools\\bin\\Release\\MSATools.tlb" no_namespace
// CMSAToolsLibrary wrapper class
class CMSAToolsLibrary : public COleDispatchDriver
{
public:
CMSAToolsLibrary() {} // Calls COleDispatchDriver default constructor
CMSAToolsLibrary(LPDISPATCH pDispatch) : COleDispatchDriver(pDispatch) {}
CMSAToolsLibrary(const CMSAToolsLibrary& dispatchSrc) : COleDispatchDriver(dispatchSrc) {}
// Attributes
public:
// Operations
public:
// _MSAToolsLibrary methods
public:
// _MSAToolsLibrary properties
public:
};
我显然在这里错过了一些东西。我期待看到我的公开方法:
SetPathXML
ReadPublisherData
SavePublisherData
AddPublisherData
我错过了什么?
这是类在IDE中的外观(MSATools DLL项目):
我试图向我的C#库添加接口,但我一定做错了什么:
using System;
using System.IO;
using System.Xml.Serialization;
using System.Runtime.InteropServices;
namespace MSATools
{
[Guid("xxxxxx")]
[ComVisible(true)]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface iInterface
{
void SetPathXML(String strPathXML);
void SavePublisherData();
void ReadPublisherData();
void AddPublisherData();
}
[Guid("xxxx")]
[ClassInterface(ClassInterfaceType.None)]
[ComVisible(true)]
public class MSAToolsLibrary
{
#region iInterface Members
public MSAToolsLibrary()
{
_PublisherData = new PublisherData();
}
[XmlIgnore]
private string _strPathXML;
public void SetPathXML(String strPathXML)
{
_strPathXML = strPathXML;
}
[XmlIgnore]
private PublisherData _PublisherData;
public void SavePublisherData()
{
XmlSerializer x = new XmlSerializer(_PublisherData.GetType());
using (StreamWriter writer = new StreamWriter(_strPathXML))
{
x.Serialize(writer, _PublisherData);
}
}
public void ReadPublisherData()
{
_PublisherData.Publishers.Clear(); // Reset
XmlSerializer x = new XmlSerializer(_PublisherData.GetType());
using (StreamReader reader = new StreamReader(_strPathXML))
{
_PublisherData = (PublisherData)x.Deserialize(reader);
}
}
public void AddPublisherData()
{
_PublisherData.AddStudent("Andrew", "Andrew notes");
_PublisherData.AddStudent("Rachel", "Rachel notes");
_PublisherData.AddStudent("Joshua", "Joshua notes");
_PublisherData.AddStudent("Finlay", "Finlay notes");
}
#endregion
}
}
编译OK。但是,当我转到Visual C ++ MFC并从TypeLib添加一个类并选择此TLB文件时,列表中没有显示可用。
困惑。
我决定尝试创建自己的类作为包装器:
#pragma once
#import "D:\\My Programs\\2017\\MSATools\\MSATools\\bin\\Release\\MSATools.tlb" raw_interfaces_only named_guids
class CMSATools
{
public:
CMSATools();
~CMSATools();
void SetPathXML(CString strPath);
void Test();
};
和:
#include "stdafx.h"
#include "MSATools.h"
CMSATools::CMSATools()
{
}
CMSATools::~CMSATools()
{
}
void CMSATools::SetPathXML(CString strPath)
{
MSATools::iInterfacePtr pInterface = NULL;
HRESULT hr;
hr = pInterface.CreateInstance(__uuidof(MSATools::MSAToolsLibrary));
if (SUCCEEDED(hr))
{
CComBSTR bstrText = strPath.AllocSysString();
pInterface->SetPathXML(bstrText);
}
}
void CMSATools::Test()
{
MSATools::iInterfacePtr pInterface = NULL;
HRESULT hr;
hr = pInterface.CreateInstance(__uuidof(MSATools::MSAToolsLibrary));
if (SUCCEEDED(hr))
{
CComBSTR bstrText(_T("d:\\TestStudents.XML"));
pInterface->SetPathXML(bstrText);
pInterface->AddPublisherData();
pInterface->SavePublisherData();
}
}
它可以编译,我可以用VisualAssist看到这些方法:
但是由于某种原因,hr
没有通过SUCCEEDED
电话。
如果我将DLL重建为x64,并将MFC EXE重建为x64,则会出现异常:
我必须添加到我的MFC应用程序中InitInstance
:
::Coinitialize(true);
并在ExitInstance
:
::CoUnitialize();
然后例外消失了。
尝试此修改,用VS生成新的GUID,因为我不记得它是否自动写入另一个文件中。
using System.Runtime.InteropServices;
...
[ComVisibleAttribute(true)]
[Guid("xxx-xxx-xxx-xxx-xxx")]
[ProgId("MSAToolsLibraryClass")]
public class MSAToolsLibrary
{
...
编辑
确保您的Assembly.cs包含以下行:
[汇编:Guid(“ xxx-xxx-xxx-xxx-xxx”)]
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