use1dlg.cpp

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// Use1Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "Use1.h"
#include "Use1Dlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CUse1Dlg dialog

CUse1Dlg::CUse1Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CUse1Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CUse1Dlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CUse1Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CUse1Dlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CUse1Dlg, CDialog)
	//{{AFX_MSG_MAP(CUse1Dlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CUse1Dlg message handlers

BOOL CUse1Dlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CUse1Dlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CUse1Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

// 包含组件编译后给我们生成的 C 语言的接口描述文件
#include "..\Simple1\simple1.h"
#include "..\Simple1\Simple1_i.c"

void CUse1Dlg::OnButton1() 
{
	::CoInitialize( NULL );

	IUnknown * pUnk = NULL;
	IFun * pFun = NULL;
	HRESULT hr;

	try
	{
		hr = ::CoCreateInstance(
			CLSID_Fun,
			NULL,
			CLSCTX_INPROC_SERVER,	// 以进程内组件 DLL 方式加载
			IID_IUnknown,			// 想取得 IUnknown 接口指针
			(LPVOID *) &pUnk);
		if( FAILED( hr ) )	throw( _T("没注册吧？") );

		hr = pUnk->QueryInterface(	// 从 IUnknown 得到其它接口指针
			IID_IFun,				// 想取得 IFun 接口指针
			(LPVOID *)&pFun );
		if( FAILED( hr ) )	throw( _T("居然没有接口？") );

		long nSum;
		hr = pFun->Add( 1, 2, &nSum );	// IFun::Add()
		if( SUCCEEDED( hr ) )
		{
			CString sMsg;
			sMsg.Format( _T("1 + 2 = %d"), nSum );
			AfxMessageBox( sMsg );
		}

		BSTR s1 = ::SysAllocString( L"Hello" );
		BSTR s2 = ::SysAllocString( L" world" );
		BSTR s3 = NULL;

		hr = pFun->Cat( s1, s2, &s3 );	// IFun::Cat()
		if( SUCCEEDED( hr ) )
		{
			CString sMsg( s3 );
			AfxMessageBox( sMsg );
		}
		
		// IFun::Cat()最后一个参数是 [out] 方向属性，因此调用者要释放内存
		if( s3 ) ::SysFreeString( s3 );
	}
	catch( LPCTSTR lpErr )
	{
		AfxMessageBox( lpErr );
	}

	if( pUnk )	pUnk->Release();
	if( pFun )	pFun->Release();

	::CoUninitialize();
}

// 包含 CComBSTR 需要使用的头文件
#include <atlbase.h>

void CUse1Dlg::OnButton2() 
{
	::CoInitialize( NULL );

	IFun * pFun = NULL;
	HRESULT hr;

	try
	{
		hr = ::CoCreateInstance(
			CLSID_Fun,
			NULL,
			CLSCTX_INPROC_SERVER,
			IID_IFun,				// 不再经过 IUnknown, 直接想得到 IFun 接口指针
			(LPVOID *) &pFun);
		if( FAILED( hr ) )	throw( _T("没注册吧或没有接口？") );

		long nSum;
		hr = pFun->Add( 1, 2, &nSum );
		if( SUCCEEDED( hr ) )
		{
			CString sMsg;
			sMsg.Format( _T("1 + 2 = %d"), nSum );
			AfxMessageBox( sMsg );
		}

		CComBSTR s1( "Hello" );		// 不再使用 API 方式操作 BSTR
		CComBSTR s2( " world" );	// 使用 CComBSTR 的包装类比较简单，并且
		CComBSTR s3;				// 最大的好处是不用咱们自己来释放

		hr = pFun->Cat( s1, s2, &s3 );
		if( SUCCEEDED( hr ) )
		{
			CString sMsg( s3 );
			AfxMessageBox( sMsg );
		}
	}
	catch( LPCTSTR lpErr )
	{
		AfxMessageBox( lpErr );
	}

	if( pFun )	pFun->Release();

	::CoUninitialize();	
}