c++动态加载dll中的类（用于实现依据字符串类名创建对象）

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参考资料：

http://blog.csdn.net/yysdsyl/archive/2008/07/08/2626033.aspx

用来生成dll的文件：

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////////////////////////////Test.h

class Test

{

public:

Test(void);

public:

virtual ~Test(void);

public:

virtual void DoSth()=0;

};

--------------------------------------------



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///////////////////TTest.h

/////////////TTest继承自Test

class TTest :

public Test

{

public:

TTest(void);

public:

~TTest(void);

public:

virtual void DoSth(){std::cout<<"TTest:do sth/n";};

};

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///////////关键





extern "C" __declspec(dllexport) Test* CreateTTestPtr();

extern "C" __declspec(dllexport) void DeleteTTestPtr(Test* t);



--------------------------------------------------

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////////////////TTest.cpp

#include "TTest.h"



TTest::TTest(void)

{

}



TTest::~TTest(void)

{

std::cout<<"destruct TTest/n";

}



Test* CreateTTestPtr()

{

return new TTest();

}



void DeleteTTestPtr(Test* t)

{

if(t!=NULL)

delete t;

}

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测试程序：

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<pre class="csharp" name="code">#include "Test.h"

#include <Windows.h>



typedef Test* (CREATEFN)();

typedef void (DELETEFN)(Test* );





int _tmain(int argc, _TCHAR* argv[])

{

HINSTANCE hd=::LoadLibrary("AnotherDll.dll");



CREATEFN* pfn;

DELETEFN* xfn;



pfn=(CREATEFN *)::GetProcAddress(hd,"CreateTTestPtr");

xfn=(DELETEFN *)::GetProcAddress(hd,"DeleteTTestPtr");



Test* t=(*pfn)();

t->DoSth();

(*xfn)(t);



getchar();

return 0;

}

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-------------------------------------------------------------------

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向dll中添加新的继承于Test基类时，实现自身的同时实现下面的两函数

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extern "C" __declspec(dllexport) Test* CreateXXXPtr();

extern "C" __declspec(dllexport) void DeleteXXXPtr(Test* t);

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（其中XXX表示新添加的类的类名，当然命名可以随意，只要你能在应用程序中找到这两导出函数，不过统一的命名规则

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对根据类名创建对象是有好处的）