我来自C#/ Java背景,所以我想弄清楚如何创建一个类似于C#dll的C++ dll。如何将C++类导出为dll?
我已经用__declspec(dllexport)
和__declspec(dllimport)
进行了实验,但是我只设法让它在静态方法上工作。我相信这是由于我的理解有限。
如何导出C++中的类(包括私有成员在内),并且能够像引用C#一样在引用端实例化它们?一些指向在线资源/教程的指针也会这样做。
我开始使用MFC dll模板,老实说,我不知道他们90%是为什么,为什么我从CWinApp继承。我试图用CCppPracticeLibraryApp
标记该类,但它不再编译。
// CppPracticeLibrary.h : main header file for the CppPracticeLibrary DLL
//
#pragma once
#ifndef __AFXWIN_H__
#error "include 'stdafx.h' before including this file for PCH"
#endif
#include "resource.h" // main symbols
#ifdef CCppPracticeLibraryApp_EXPORTS
#define CCppPracticeLibraryApp_API __declspec(dllexport)
#else
#define CCppPracticeLibraryApp_API __declspec(dllimport)
#endif
// CCppPracticeLibraryApp
// See CppPracticeLibrary.cpp for the implementation of this class
//
class CCppPracticeLibraryApp : public CWinApp
{
public:
CCppPracticeLibraryApp();
static CCppPracticeLibraryApp_API void SayHelloWorld();
// Overrides
public:
virtual BOOL InitInstance();
DECLARE_MESSAGE_MAP()
};
定义文件:
//CppPracticeLibrary.cpp:定义DLL初始化程序。
#include "stdafx.h"
#include "CppPracticeLibrary.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
#define CCppPracticeLibraryApp_EXPORTS
BEGIN_MESSAGE_MAP(CCppPracticeLibraryApp, CWinApp)
END_MESSAGE_MAP()
// CCppPracticeLibraryApp construction
CCppPracticeLibraryApp::CCppPracticeLibraryApp()
{
// TODO: add construction code here,
// Place all significant initialization in InitInstance
}
void CCppPracticeLibraryApp::SayHelloWorld()
{
printf("Hello world");
}
// The one and only CCppPracticeLibraryApp object
CCppPracticeLibraryApp theApp;
// CCppPracticeLibraryApp initialization
BOOL CCppPracticeLibraryApp::InitInstance()
{
CWinApp::InitInstance();
return TRUE;
}
客户/引用方法
// TestConsoleApplication.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "TestConsoleApplication.h"
#include "CppPracticeLibrary.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// The one and only application object
CWinApp theApp;
using namespace std;
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
HMODULE hModule = ::GetModuleHandle(NULL);
if (hModule != NULL)
{
// initialize MFC and print and error on failure
if (!AfxWinInit(hModule, NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: MFC initialization failed\n"));
nRetCode = 1;
}
else
{
// TODO: code your application's behavior here.
/*CCppPracticeLibraryApp* testCallingLibrary = new CCppPracticeLibraryApp();
testCallingLibrary->SayHelloWorld();*/
CCppPracticeLibraryApp::SayHelloWorld();
}
}
else
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: GetModuleHandle failed\n"));
nRetCode = 1;
}
return nRetCode;
}
我想能够取消注释在上面的代码下面的行:
/*CCppPracticeLibraryApp* testCallingLibrary = new CCppPracticeLibraryApp();
testCallingLibrary->SayHelloWorld();*/
请显示您的代码... –
@ bash.d使用代码更新。 – Alwyn