www.gusucode.com > VC 串口通讯_数据库存取例子-源码程序 > VC 串口通讯_数据库存取例子-源码程序/code/Modem3/Modem3.cpp

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// Modem3.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "Modem3.h"
#include "Modem3Dlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CModem3App

BEGIN_MESSAGE_MAP(CModem3App, CWinApp)
	//{{AFX_MSG_MAP(CModem3App)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG
	ON_COMMAND(ID_HELP, CWinApp::OnHelp)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CModem3App construction

CModem3App::CModem3App()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CModem3App object

CModem3App theApp;

/////////////////////////////////////////////////////////////////////////////
// CModem3App initialization

BOOL CModem3App::InitInstance()
{    
 	m_hInstance=::CreateMutex(NULL,FALSE,UNIQUE_NAME);
	if(GetLastError()==ERROR_ALREADY_EXISTS)
	{
		AfxMessageBox("一个实例已在运行,本副本自动关闭");
		return FALSE;
	}
	AfxEnableControlContainer();
   /****ADO********************************/
  AfxOleInit();///初始化COM库
  ::CoInitialize(NULL);
	////////////连接数据库//////////////
	HRESULT hr;
	try
	{
	hr = m_pConnection.CreateInstance("ADODB.Connection");///创建Connection对象
	if(SUCCEEDED(hr))
	{
	hr = m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=db10.mdb","","",adModeUnknown);///连接数据库
	///上面一句中连接字串中的Provider是针对ACCESS2000环境的，对于ACCESS97,需要改为:Provider=Microsoft.Jet.OLEDB.3.51;  }
	}

	}
	catch(_com_error e)///捕捉异常
	{
		CString errormessage;
		errormessage.Format("连接数据库失败!\r\n错误信息:%s",e.ErrorMessage());
		AfxMessageBox(errormessage);///显示错误信息
		return FALSE;
	} 
	// Standard initialization
	// If you are not using these features and wish to reduce the size
	//  of your final executable, you should remove from the following
 SetDialogBkColor (RGB (220, 220, 220), RGB ( 0 ,0 , 0 ) );	//  the specific initialization routines you do not need.

#ifdef _AFXDLL
	Enable3dControls();			// Call this when using MFC in a shared DLL
#else
	Enable3dControlsStatic();	// Call this when linking to MFC statically
#endif

	CModem3Dlg dlg;
	m_pMainWnd = &dlg;
	int nResponse = dlg.DoModal();
	if (nResponse == IDOK)
	{
		// TODO: Place code here to handle when the dialog is
		//  dismissed with OK
	}
	else if (nResponse == IDCANCEL)
	{    
	    
		// TODO: Place code here to handle when the dialog is
		//  dismissed with Cancel
	}

	// Since the dialog has been closed, return FALSE so that we exit the
	//  application, rather than start the application's message pump.
	return FALSE;
}

int CModem3App::ExitInstance() 
{
	// TODO: Add your specialized code here and/or call the base class
	if(m_pConnection->State)
	 m_pConnection->Close(); ///如果已经打开了连接则关闭它
    CloseHandle(m_hInstance);
	::CoUninitialize();
	return CWinApp::ExitInstance();
}