我正在尝试学习如何编写C# DLL并从MFC应用程序中调用它。
以下是一部分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交互操作的选项，并获得了一个TLB文件。
然后我进入一个新的MFC项目，按照教程创建了一个从TLB文件生成类的过程。但是它只创建了：
// 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:
};
我显然在这里漏掉了某些东西。我预期能够看到我的公共方法：
SetPathXML
ReadPublisherData
SavePublisherData
AddPublisherData
我错过了什么？
这是IDE中类的样子（MSATools DLL项目）:
更新
我尝试向我的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
}
}
编译没有问题。但是当我打开Visual C++ MFC并从TypeLib添加类，选择这个TLB文件时，列表中没有可用的内容。
感到困惑。
更新2
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();
};
并且：
#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();
}
}
它编译通过了，我可以用VisualAssist看到方法：
但由于某种原因，hr 没有通过 SUCCEEDED 调用。
更新3
如果我将DLL重新构建为x64，并将MFC EXE重新构建为x64，则会出现异常：
更新4
我必须在我的MFC应用程序的 InitInstance 中添加：
::Coinitialize(true);
在ExitInstance函数中：
::CoUnitialize();
然后异常消失了。
cs文件中设置为true。但我没有以任何方式标记任何方法。 - Andrew Truckle