如何将动态库(DLL)中的类导出(二)

fatwave

EXE文件: FMakeDll.cpp

//---------------------------------------------------------------------------

//使用静态调用，别忘了Project->Add to project...添加MakeDll.lib

#include <vcl.h>

#pragma hdrstop

#include "FTestDll.h"

//---------------------------------------------------------------------------

#pragma package(smart_init)

#pragma resource "*.dfm"

TForm1 *Form1;

//---------------------------------------------------------------------------

__fastcall TForm1::TForm1(TComponent* Owner)

    : TForm(Owner)

{

    hMyDll = NULL;

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)

{

    TestA(10);

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button2Click(TObject *Sender)

{

    if(hMyDll != NULL)

    {

     ShowMessage("已经为对象分配资源！");

     return;

    }

    hMyDll = InitMakeDll();

    if(hMyDll != NULL)

    {

     ShowMessage("获得对象句柄成功！");

    }

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button3Click(TObject *Sender)

{

    int irtn;

    irtn = TestB(hMyDll,20);

    if(errOk == irtn)

    {

     ShowMessage("使用句柄执行测试函数B成功！");

    }

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button4Click(TObject *Sender)

{

    int irtn;

    //这种情况下需要使用者在程序中自己控制

    if(hMyDll == NULL)

    {

     ShowMessage("对象还没有被创建或已经释放");

     return;

    }

    irtn = ReleaseMakeDll(hMyDll);

    if(errOk == irtn)

    {

     ShowMessage("使用句柄释放对象成功！");

    }

    hMyDll = NULL;

}

//---------------------------------------------------------------------------

EXE文件: FTestDll.h

//---------------------------------------------------------------------------

#ifndef FTestDllH

#define FTestDllH

//---------------------------------------------------------------------------

#include <Classes.hpp>

#include <Controls.hpp>

#include <StdCtrls.hpp>

#include <Forms.hpp>

//---------------------------------------------------------------------------

//DLL的导出函数文件(上面已经介绍过)

#include "MakeDll.h"

//---------------------------------------------------------------------------

class TForm1 : public TForm

{

__published: // IDE-managed Components

    TButton *Button1;

    TButton *Button2;

    TButton *Button3;

    TButton *Button4;

    void __fastcall Button2Click(TObject *Sender);

    void __fastcall Button1Click(TObject *Sender);

    void __fastcall Button3Click(TObject *Sender);

    void __fastcall Button4Click(TObject *Sender);

private: // User declarations

    //因为在整个窗体中需要使用hTestDll，定义在这里好了

    //从这里的声明根本不会看到有关原来的类的影子

    HANDLE hMyDll;

public:       // User declarations

    __fastcall TForm1(TComponent* Owner);

};

//---------------------------------------------------------------------------

extern PACKAGE TForm1 *Form1;

//--------------------------------------------------------------------------

#endif