DLL

新建工程,选Win32 Dynamic-Link Library,工程名为dll例子,然后选A DLL that exports some symbols,完成.

工程已经有了一个类CDll,一个变量nDll和一个函数fnDll.

在类CDll中添加例子函数f.

在dll例子.h中添加

#ifdef __cplusplus
extern "C" {
#endif

和

#ifdef __cplusplus
}
#endif

以下是dll例子.h的代码:

//手动添加
#ifdef __cplusplus    // If used by C++ code, 
extern "C" {          // we need to export the C interface
#endif

#ifdef DLL_EXPORTS
#define DLL_API __declspec(dllexport)
#else
#define DLL_API __declspec(dllimport)
#endif

// This class is exported from the dll例子.dll
class DLL_API CDll {
public:
	CDll(void);
	// TODO: add your methods here.
	int f();
};

extern DLL_API int nDll;

DLL_API int fnDll(void);

//手动添加
#ifdef __cplusplus
}
#endif

　　以下是dll例子.cpp的代码:

#include "stdafx.h"
#include "dll例子.h"

BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
    switch (ul_reason_for_call)
	{
		case DLL_PROCESS_ATTACH:
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
			break;
    }
    return TRUE;
}


// This is an example of an exported variable
DLL_API int nDll=0;

// This is an example of an exported function.
DLL_API int fnDll(void)
{
	return 42;
}

// This is the constructor of a class that has been exported.
// see dll例子.h for the class definition
CDll::CDll()
{ 
	return; 
}

int CDll::f()
{
	return 1;
}

　　下面演示静态链接:

新建win32控制台应用程序,选择支持MFC.

将dll例子.h, .dll和.lib拷入工程文件夹中.程序内容如下:

#include "stdafx.h"
#include "隐式链接.h"
#include "dll例子.h" //包括头文件
#pragma comment(lib, "dll例子.lib") //链接lib库

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// The one and only application object

CWinApp theApp;

using namespace std;

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
    cout<<nDll<<endl;
    cout<<fnDll()<<endl;
    CDll c;
    cout<<c.f()<<endl;
    return 0;
}

下面演示动态链接:

新建win32控制台应用程序,选择支持MFC.

程序内容如下:

#include "stdafx.h"
#include "显式链接.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// The one and only application object

CWinApp theApp;

using namespace std;

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
    HINSTANCE hDLL;
    hDLL = AfxLoadLibrary("dll例子.dll");

    int* p = (int*)GetProcAddress(hDLL,"nDll");
    cout<<*p<<endl;

    typedef int (* dllfunc)(void);
    dllfunc pF = (dllfunc)::GetProcAddress(hDLL, "fnDll");
    cout<<pF()<<endl;

    return 0;
}

怎么导出类不知道,如果你知道的话,请告诉我.