www.pudn.com > sqlcommand.zip > VOConnection.cpp

//------------------------------------------------------------------- 
// VOConnection implementation 
//------------------------------------------------------------------- 
//  
// Copyright ©2000 Virtual Office Systems Incorporated 
// All Rights Reserved                       
// 
// This code may be used in compiled form in any way you desire. This 
// file may be redistributed unmodified by any means PROVIDING it is  
// not sold for profit without the authors written consent, and  
// providing that this notice and the authors name is included. 
// 
// This code can be compiled, modified and distributed freely, providing 
// that this copyright information remains intact in the distribution. 
// 
// This code may be compiled in original or modified form in any private  
// or commercial application. 
// 
// This file is provided "as is" with no expressed or implied warranty. 
// The author accepts no liability for any damage, in any form, caused 
// by this code. Use it at your own risk. 
//------------------------------------------------------------------- 
 
#include "stdafx.h" 
#include "SQLCommand.h" 
#include "VOConnection.h" 
#include  
#include  
 
#ifdef _DEBUG 
#undef THIS_FILE 
static char THIS_FILE[]=__FILE__; 
#define new DEBUG_NEW 
#endif 
 
const IID IID__Connection = { 0x113033de, 0xf682, 0x11d2,	{ 0xbb, 0x62, 0x00, 0xc0, 0x4f, 0x68, 0x0a, 0xcc}}; 
 
void __stdcall _com_issue_error(HRESULT m_hr) 
{ 
	TCHAR pcszError[1024]; 
 
	_stprintf(pcszError, TEXT("_com_issue_error(%ld)\n"), m_hr); 
	OutputDebugString(pcszError); 
} 
 
BOOL	CVOConnection::g_Init = FALSE; 
CLSID	CVOConnection::g_ClsID; 
TCHAR*	CVOConnection::g_ProgID = TEXT("ADOCE.Connection.3.0"); 
 
////////////////////////////////////////////////////////////////////// 
// Construction/Destruction 
////////////////////////////////////////////////////////////////////// 
 
CVOConnection::CVOConnection(LPCTSTR pcszProvider) : m_Conn(NULL) 
{ 
	if(!g_Init) 
		Initialize(); 
 
	HRESULT hr; 
 
	if(pcszProvider == NULL) 
		pcszProvider = TEXT("cedb"); 
 
	hr = CoCreateInstance(g_ClsID, NULL, CLSCTX_INPROC_SERVER, IID__Connection, (LPVOID*) &m_Conn); 
	hr = m_Conn->put_Provider((LPTSTR)pcszProvider); 
	hr = m_Conn->Open(TEXT(""),TEXT(""),TEXT(""),adOpenUnspecified); 
} 
 
CVOConnection::~CVOConnection() 
{ 
	if(m_Conn) 
	{ 
		m_Conn->Close(); 
		m_Conn->Release(); 
	} 
} 
 
BOOL CVOConnection::Initialize() 
{ 
	if(FAILED(CoInitializeEx(NULL, COINIT_MULTITHREADED))) 
		return FALSE; 
	 
	HRESULT hr; 
 
	hr = CLSIDFromProgID(g_ProgID, &g_ClsID); 
 
	if(FAILED(hr)) 
		return FALSE; 
 
	return TRUE; 
}