C / C++ / MFC

int x=1, y=5; 
x^=y^=x^=y; // whats the content of x and y now?
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>

int x=1, y=5; 
x^=y^=x^=y; // whats the content of x and y now?
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>

int x=1, y=5; 
x^=y^=x^=y; // whats the content of x and y now?
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>

int x=1, y=5; 
x^=y^=x^=y; // whats the content of x and y now?
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>

void CTrain1View::QueryRegistry()
{
	CString dbName;

	
	HKEY keyHandle1, keyHandle2, keyHandle3;
	CString str;
;
	
	DWORD valSize = sizeof(DWORD);

	// Open the Software key under HKEY_CURRENT_USER.
	RegOpenKeyEx(HKEY_CURRENT_USER, "Software",
		0, KEY_ALL_ACCESS, &keyHandle1);


	// Open the MyCompany key under Software.
		LONG res = RegOpenKeyEx(keyHandle1, "MyCompany4",
		0, KEY_ALL_ACCESS, &keyHandle2);


	// Open the MyApplication key under MyCompany.
	RegOpenKeyEx(keyHandle2, "MyApplication4",
		0, KEY_ALL_ACCESS, &keyHandle3);

	
	DWORD size=128;
	DWORD	type = REG_SZ;
	LPSTR psz = dbName.GetBuffer(size);
	LONG result =	RegQueryValueEx( keyHandle3,"Database Name",0,&type,(LPBYTE)psz,&size );
	dbName.ReleaseBuffer();


	 size=128;
//	DWORD	type = REG_SZ;
	LPSTR psz1 = m_PhotoDBPath.GetBuffer(size);
	 result =	RegQueryValueEx( keyHandle3,"Photo Database Name",0,&type,(LPBYTE)psz1,&size );
	m_PhotoDBPath.ReleaseBuffer();




	 size=128;
//	DWORD	type = REG_SZ;
	LPSTR psz2 = m_ImageFolderLoc.GetBuffer(size);
	 result =	RegQueryValueEx( keyHandle3,"Image Folder Location",0,&type,(LPBYTE)psz2,&size );
	m_ImageFolderLoc.ReleaseBuffer();

	gImageFolderLoc = m_ImageFolderLoc;
	
	// Close all the open keys.
	RegCloseKey(keyHandle1);
	RegCloseKey(keyHandle2);
	RegCloseKey(keyHandle3);

	// query for DB name here and if no name, pop up showOpen. Get name
//	if name in registry, get name
	//Call function wrappper for DLLgetKeywords (getstuff at the mo) - this is a member function of the doc, so call via pointer
	//: Wrapper because when the DB buton is directly activated, we need to duplicate the process - pass of name into wrapper which calls Dllgetkeywords
//	CTrain1Doc * pDoc = GetDocument();
	
	if (result == ERROR_SUCCESS) //return  dbName; 
	
	{
		gDatabaseName=dbName; //this is the whole path being used in this program

		CString filename = DatabaseName(dbName); //extracts just abc.mdb from full path.
		//AfxMessageBox(filename);
		GetStuff(dbName );
		InitDisplay();
	}

//	if( result != ERROR_SUCCESS)popup showopen.Basically trigger  the select db menu
	if ( dbName =="")//( result != ERROR_SUCCESS)
{
PostMessage(WM_COMMAND, ID_SELECTDATABASE);

}
	}

CFileDialog fileDlg(TRUE, NULL, NULL, OFN_HIDEREADONLY|OFN_FILEMUSTEXIST, "Database Files(*.mdb)|*.mdb||",NULL); 

// Initializes m_ofn structure 
fileDlg.m_ofn.lpstrTitle = "Open Database";

// Call DoModal
if ( fileDlg.DoModal() == IDOK)
{
    m_szlstfile = fileDlg.GetPathName(); // This is your selected file name with path

	//if extension of the file isnt mdb, error msg -file selected is not a db.
  //  AfxMessageBox("Your file name is :" +m_szlstfile );
	CString fileExt = fileDlg.GetFileExt();

//	AfxMessageBox(fileExt);
	if(fileExt != "MDB" && fileExt != "mdb" )
	{
	m_badfilename=TRUE;
	AfxMessageBox ("The file selected is not a database file");
	imageMap.clear();
	/////

	InitDisplay(); //isnt doing it the way things are at the moment. Might work.
	//blank out pictures, "invalid database" in textboxes, blank out display list, blank out search screen.(delete all items)
	return;
	}
	//always do
	m_listdisplay.DeleteAllItems();



	//////aug27

	CFileDialog fileDlg(TRUE, NULL, NULL, OFN_HIDEREADONLY|OFN_FILEMUSTEXIST, "Database Files(*.mdb)|*.mdb||",NULL); 

	// Initializes m_ofn structure 
	fileDlg.m_ofn.lpstrTitle = "Select Database For Photographs";

	// Call DoModal

	int nRetPhoto = fileDlg.DoModal();

	if ( nRetPhoto == IDOK)
	{
		m_PhotoDBPath = fileDlg.GetPathName(); // This is your selected file name with path

		//if extension of the file isnt mdb, error msg -file selected is not a db.
		//  AfxMessageBox("Your file name is :" +m_szlstfile );
		CString fileExt = fileDlg.GetFileExt();

		//	AfxMessageBox(fileExt);
		if(fileExt != "MDB" && fileExt != "mdb" )
		{
		//	m_badfilename=TRUE;
			AfxMessageBox ("The file selected is not a database file. No record added");

			return;
		}



	}



	CFileDialogST	dlg;
	int				nRetValue;
	CString			sFolder;

	nRetValue = dlg.SelectFolder(_T("Please select the Image folder"), _T("c:\\"), 0x40|BIF_RETURNFSANCESTORS | BIF_RETURNONLYFSDIRS, this);
	if (nRetValue == IDOK)
	{
		m_ImageFolderLoc = dlg.GetSelectedFolder();

		gImageFolderLoc = m_ImageFolderLoc;    
		MessageBox(m_ImageFolderLoc, _T("GetSelectedFolder"), MB_ICONINFORMATION);
	} // if

	
	HKEY keyHandle1, keyHandle2, keyHandle3;
	CString str;
	DWORD disp;
    
    // Open the Software key under HKEY_CURRENT_USER.
    RegOpenKeyEx(HKEY_CURRENT_USER, "Software",
        0, KEY_ALL_ACCESS, &keyHandle1);

	//These keys already exist since mainframe precreated them if reqd, while looking for loading info.
    // open the MyCompany key under Software.
    RegCreateKeyEx(keyHandle1, "MyCompany4", 0, "",
        REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL,
        &keyHandle2, &disp);

    // open the MyApplication key under MyCompany.
    RegCreateKeyEx(keyHandle2, "MyApplication4", 0, "",
        REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL,
        &keyHandle3, &disp);

   	// string
	DWORD type = REG_SZ;
	DWORD size = m_szlstfile.GetLength();
	LONG result = RegSetValueEx( keyHandle3,"Database Name",0,type,(LPBYTE)LPCSTR(m_szlstfile),size );

	   	// string
//	DWORD type = REG_SZ;
	 size = m_PhotoDBPath.GetLength();
	 result = RegSetValueEx( keyHandle3,"Photo Database Name",0,type,(LPBYTE)LPCSTR(m_PhotoDBPath),size );


	   	// string
//	DWORD type = REG_SZ;
	 size = m_ImageFolderLoc.GetLength();
	 result = RegSetValueEx( keyHandle3,"Image Folder Location",0,type,(LPBYTE)LPCSTR(m_ImageFolderLoc),size );

	
	if (result != ERROR_SUCCESS)
		AfxMessageBox("Registry error");
   

	// Close all the open keys.
	RegCloseKey(keyHandle1);
	RegCloseKey(keyHandle2);
	RegCloseKey(keyHandle3);



	gDatabaseName = m_szlstfile;

	if (pDoc->m_db.IsOpen()) pDoc->m_db.Close();

	GetStuff(m_szlstfile );	
	InitDisplay();

int x=1, y=5; 
x^=y^=x^=y; // whats the content of x and y now?
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>

int x=1, y=5; 
x^=y^=x^=y; // whats the content of x and y now?
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>

int x=1, y=5; 
x^=y^=x^=y; // whats the content of x and y now?
<a href="http://www.codeproject.com/tips/StupidXORTrick.asp" target="_blank">ClickHereForHelp();</a>