VC ++包装器DLL [英] A VC++ wrapper DLL

问题描述

我有一个不受管理的第三方DLL(包括带有源代码的Visual C ++ Express项目).我想编写一个托管C ++包装DLL，以便可以使用VB中的DLL.

我已经15年没碰过C了-我的大部分演奏"都在VB中进行.

我有C ++和VB 2010 Express.

我创建了一个新的C ++类库，并将一些代码添加到头文件中(请参见下文).

代码会编译.从VB中可以看到我的属性，但是两个函数(WrapiguanaClose和WrapiguaneCode)不可见.一旦我掌握了基础知识，就会添加更多的属性和函数.

这可能是一个愚蠢的错误-显示我对C ++的过时态度.

谁能告诉我我哪里出问题了?

I have a third party DLL (including a Visual C++ Express project with source code) that is, I think, unmanaged. I Want to write a Managed C++ wrapper DLL so I can use the DLL from VB.

I have not touched C for about 15 years - most of my ''playing'' has been in VB.

I have C++ and VB 2010 express.

I have created a new C++ Class Library and added some code to the header file (see below).

The code compiles. From VB I can see my property, but the two functions (WrapiguanaClose and WrapiguaneCode) are not visible. There will be several more properties and functions added once I can get the basics working.

It is probably a silly mistake - showing how out of date I am with C++.

Could anyone please tell me where I have gone wrong ?

// iguanaIRDLLWrapper.h

#pragma once
// #pragma comment(lib, "iguanaIRDLLWrapper.lib")
#include "Stdafx.h"
#include "iguanaIR.h"
#include "resource.h"

using namespace System;
using namespace System::Reflection;
using namespace System::Windows::Forms;

namespace iguanaIRDLLWrapper {

	public ref class igWrap
	{
		// TODO: Add your methods for this class here.
public:
    property int Version
    {
        int get()
        {
            return 1;
        }
        
       /* void set(int x)
        {
            _StudRank = x;
        }*/
    }


	// void WrapiguanaIRClose(PIPE_PTR connection);
	// void WrapiguanaIRCode(const iguanaPacket pkt);
 
	public : void WrapiguanaClose(PIPE_PTR connection)
	    /*      void iguanaClose(PIPE_PTR connection)  */

{
	typedef int (__cdecl *igClosePROC)(HANDLE);

	HINSTANCE hinstLib; 
    igClosePROC ProcAdd; 
    BOOL fFreeResult, fRunTimeLinkSuccess = FALSE; 
 
    // Get a handle to the DLL module.
 
    hinstLib = LoadLibrary(TEXT("iguanaIR.dll")); 
 
    // If the handle is valid, try to get the function address.
 
    if (hinstLib != NULL) 
    { 
        ProcAdd = (igClosePROC) GetProcAddress(hinstLib, "iguanaClose"); 
 
        // If the function address is valid, call the function.
 
        if (NULL != ProcAdd) 
        {
            fRunTimeLinkSuccess = TRUE;
            (ProcAdd) (connection); 
        }
        // Free the DLL module.
 
        fFreeResult = FreeLibrary(hinstLib); 
    } 
 }

	public : void WrapiguanaCode(const iguanaPacket pkt)
	    /*      unsigned char iguanaCode(const iguanaPacket pkt)  */

{
	typedef int (__cdecl *igCodePROC)(iguanaPacket);

	HINSTANCE hinstLib; 
    igCodePROC ProcAdd; 
    BOOL fFreeResult, fRunTimeLinkSuccess = FALSE; 
 
    // Get a handle to the DLL module.
 
    hinstLib = LoadLibrary(TEXT("iguanaIR.dll")); 
 
    // If the handle is valid, try to get the function address.
 
    if (hinstLib != NULL) 
    { 
        ProcAdd = (igCodePROC) GetProcAddress(hinstLib, "iguanaClose"); 
 
        // If the function address is valid, call the function.
 
        if (NULL != ProcAdd) 
        {
            fRunTimeLinkSuccess = TRUE;
            (ProcAdd) (pkt); 
        }
        // Free the DLL module.
	}
}
	};
}

在此先感谢您的帮助.

John Hadley

Thanks in advance for any help.

John Hadley

推荐答案

我想这是因为用作方法参数的类型没有公开为托管数据类型.

V.

Hi,

I suppose it''s because the types used as parameters of your methods are not exposed as managed data types.

V.

Err-对不起-我理解这些字眼，但听不懂意思.

我尝试过:-

//public:无效WrapiguanaClose(PIPE_PTR连接)
public:无效WrapiguanaClose(HANDLE连接)

结果相同.

如果那不是您的意思，那么我应该包括什么代码来公开我的方法参数?

John Hadley

Err - sorry - I understand the words, but not the meaning.

I tried :-

// public : void WrapiguanaClose(PIPE_PTR connection)
public : void WrapiguanaClose(HANDLE connection)

with the same result.

If that was not your meaning what code should I include to expose my method parameters?

John Hadley

尝试使用IntPtr而不是PIPE_PTR或HANDLE:最后两个是仅在 C ++
上定义的数据类型
另一个技巧:避免在每次调用 DLL 时加载和卸载DLL，这会浪费大量时间.最好的方法是在应用程序启动时仅加载 dll 一次，最后将其卸载.您可以从包装器dll 中导出2个函数来执行此操作，例如 bool WrapperInitialize()和void WrapperUninitialize()

Try using IntPtr instead than PIPE_PTR or HANDLE: the last two are datatypes defined only on C++

Another trick: avoid loading and unloading the DLL each time you make a call into it, it''s a big waste of time. The best is to load the dll only once at the application startup and unload it at the end. You could export 2 functions from your wrapper dll to do it, like bool WrapperInitialize() and void WrapperUninitialize()

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