Understand and Prevent Memory Leaks in Delphi

Understand and Prevent Memory Leaks in Delphi Delphis support for object-oriented programming is rich and powerful. Classes and objects allow for modular code programming. Along with more modular and more complex components come more sophisticated and more complex bugs. While developing applications in Delphi is (almost) always fun, there are situations when you feel like the whole world is against you. Whenever you need to use (create) an object in Delphi, you need to free the memory it consumed (once no longer needed). Surely, the try/finally memory guarding blocks can help you prevent memory leaks; its still up to you to safeguard your code. A memory (or resource) leak occurs when the program loses the ability to free the memory it consumes. Repeated memory leaks cause the memory usage of a process to grow without bounds. Memory leaks are a serious problem if you have a code causing memory leak, in an application running 24/7, the application will eat up all the memory available and finally make the machine stop responding. Memory Leaks in Delphi The first step to avoiding memory leaks is to understand how they occur. What follows is a discussion on some common pitfalls and best practices for writing non-leaking Delphi code. In most (simple) Delphi applications, where you use the components (Buttons, Memos, Edits, etc.) you drop on a form (at design time), you do not need to care too much about memory management. Once the component is placed on a form, the form becomes its owner and will free the memory taken by the component once the form is closed (destroyed). Form, as the owner, is responsible for memory deallocation of the components it hosted. In short: components on a form are created and destroyed automatically Examples of Memory Leaks In any non-trivial Delphi application, you will want to instantiate Delphi components at run time. You will, also, have some of your own custom classes. Lets say you have a class TDeveloper that has a method DoProgram. Now, when you need to use the TDeveloper class, you create an instance of the class by calling the Create method (constructor). The Create method allocates memory for a new object and returns a reference to the object. varzarko : TDeveloperbeginzarko : TMyObject.Create;zarko.DoProgram;end; And heres a simple memory leak! Whenever you create an object, you must dispose of the memory it occupied. To free the memory an object allocated, you must call the Free method. To be perfectly sure, you should also use the try / finally block: varzarko : TDeveloperbeginzarko : TMyObject.Create;tryzarko.DoProgram;finallyzarko.Free;end;end; This is an example of safe memory allocation and deallocation code. Some words of warning: If you want to dynamically instantiate a Delphi component and explicitly free it sometime later, always pass nil as the owner. Failure to do so can introduce unnecessary risk, as well as performance and code maintenance problems. Besides creating and destroying objects using the Create and Free methods, you must also be very careful when using external (files, databases, etc) resources.Lets say you need to operate on some text file. In a very simple scenario, where the AssignFile method is used to associate a file on a disk with a file variable when you are finished with the file, you must call CloseFile to free the file handle to begin used. This is where you do not have an explicit call to Free. varF: TextFile;S: string;beginAssignFile(F, c:\somefile.txt) ;tryReadln(F, S) ;finallyCloseFile(F) ;end;end; Another example includes loading external DLLs from your code. Whenever you use LoadLibrary, you must call FreeLibrary: vardllHandle : THandle;begindllHandle : Loadlibrary(MyLibrary.DLL) ;//do something with this DLLif dllHandle 0 then FreeLibrary(dllHandle) ;end; Memory Leaks in .NET? Although with Delphi for .NET the garbage collector (GC) manages most memory tasks, it is possible to have memory leaks in .NET applications. Heres an article discussion GC in Delphi for .NET. How to Fight Against Memory Leaks Besides writing modular memory-safe code, preventing memory leaks can be done by using some of the third-party tools available. Delphi Memory Leak Fix Tools help you catch Delphi application errors such as memory corruption, memory leaks, memory allocation errors, variable initialization errors, variable definition conflicts, pointer errors, and more.

An Effective Electoral system

An Effective Electoral system Disclaimer: This work has been submitted by a student. This is not an example of the work produced by our Law Essay Writing Service . You can view samples of our professional work here . An Effective Electoral system Electoral system or voting system is a system by which voters can make a choice between the options put forward before them. It is often used in an election or when passing a policy referendum. In a democratic state, the electoral process determines who will in charge of the political office. It is the electorate which confers the power to govern and calls government to account. A voting system contains rules for valid voting, and how votes are counted and aggregated to tally the final result   [ 1 ]   . According to Encyclopedia Britannica, electoral system, method and rules of counting votes is used to determine the outcome of elections. Winner may be determined by a plurality, a majority (more than 50% of the vote), an extraordinary majority (a percentage of votes greater than 50%), or unanimity. Candidates for public office may be elected directly or indirectly   [ 2 ]   . In this question, it was asked whether a proper electoral system wo uld be able to uphold rights. Well, first we shall look at what is a proper electoral system? A proper electoral system or also known as a proportional electoral system is a principle which attempts to ensure that the outcome of the election reflects the proportion of support gained by each competing parties. In easier words, a proportional electoral system occurs when there equal amount of votes and seats in the parliament. Proportional electoral system is totally different from the Majoritarian principle. In majoritarian system, party or candidates obtain a plurality of votes within that certain constituency wins that election. Examples of a proportional system are Single Transferrable Vote (STV) and Party List System. A single transferrable vote is a method of election where a voter ranks the candidates in order or preference. This system does not depend on the candidate being grouped into their political parties   [ 3 ]   . The votes would be transferred between candidates i n a manner similar to instant run off voting, but in addition to transferring votes from the candidates who have been eliminated to the next candidate on the list. This method is being applied in Australia, Ireland, Malta, New York, Cincinnati, Cleveland, Toledo, and Boulder.   [ 4 ]   This system is a good system as it prevents votes from being wasted; this is because all the votes given by the voters would be taken into account. And through this system, the citizens of that specific area would have more voice to voice out their opinion and problems in the Parliament, as they have not only one representative but a larger choice of representative. STV also protects the minorities. This is because the minority voters may split their votes across party lines. They can also exercise choice among candidates from the same party. However, STV has disadvantages. One of it is that this system is extremely complex, as it requires a large amount time and meticulous mathematical calculatio ns. Party List System on the other hand, is method in which the voters vote for the parties, rather that voting for the individual candidates   [ 5 ]   . For each of the quota of votes a certain party receives, one of their representatives wins a seat in Parliament. This system is being used in most European democracies and also in most newly democratized countries, like South Africa. This system is simple, easy to understand and it works in any uncomplicated manners. It does not require any complicated and time consuming calculations. This system is extremely fair and equitable from the whole distribution of seats. However, the disadvantage of this system is that no single party can secure an absolute majority in the Parliament. It also destroys the valuable local link between the MP and his constituents, as the constituents may not even know their representative. Party List System also places too much power in the hands of those at the top of the party hierarchy.

Forecasting Techniques In Aviation Industry Essay

Forecasting Techniques In Aviation Industry - Essay Example The company developed and implemented a global supply chain solution. This enabled the company to deliver on board customer services as one of the largest airline firms of the world. The company is first to personalize the service for the valued customers. The technology partners of the company are industry matematik International (IMI), Manugistics. One of the most valued strength of the company is committed and professional people in the staff. The majority of the staff in BA is willing to own a problem and is capable of chasing it exemplary. 1 The British Airways demonstrated the compatibility of pleasure and profits. The organization in the company presented its culture as the explanation for the transformation. The organizational environment at the time of transformation resulted in structural changes observing the impact of them in the long term. The organizational structure of the firm exhibited no corporate friction. In general the corporate friction targets to promote positive attitudes by increasing employee's area of responsibility. This system will align financial interests. BA's organizational structure targeted employee attitudes and aimed at secure commitment. The structure did not resign behavioral compliance as staff has common vision in working together. 2 1.2 Problem definition and analysis: The problem conside... When the items are slow moving, generally they are not available readily and the maintenance of those parts by the company can be a burden of inventory. As airlines are a service industry, the maintenance of an inventory to avoid shortage of spare parts is not cost effective practice. One of the possible solutions is the forecasting techniques for the shortage of spares. The forecasting of the problem helps in acquiring the required parts in a particular period of time for the aircrafts of the firm. The all zero, several levels of demand lumpiness, demand variation and ordering, holding and shortage cost are the few models that can be useful in fore casting the shortage of spares in the airlines firm. The evaluation of the forecasting methods by three measures of forecast error and other measures by inventory cost is recommended. All zero forecasts yield the lowest cost when the lumpiness is high. The bid lumpiness also requires the zero forecasts when the shortage cost is more than the holding cost. The maintenance of the spares in the form of inventory should be termed as cost effective when the cost incurred on the company due to shortage is more than the holding cost of the spares in the form of inventory.3 2. Literature Review 2.1 Forecasting demands and Challenges: A.A. Ghobbar in 1994 stated that the most accurate forecasting method on the basis of demand pattern fluctuation in the industry. The average mean absolute percentage error can help in selecting the forecasting methods. The average inner demand interval categorisation can establishes the validity of the factor ranges as a crucial finding. This will simplify and segment the results obtained by evaluating the forecasting methods and

Reserach Proposal on Leadership Research Example | Topics and Well Written Essays - 2000 words

Reserach on Leadership - Research Proposal Example Transformational leadership is increasingly seen as critical, not only in the competitive landscape of an organization, but also to the leader’s impact on team effectiveness (Grant, 2012; Ozaralli, 2003). Increasingly, leaders are not only faced with the challenge of how to introduce change, but also how to manage change (Watkins, 2004), which seems especially important when the introduction of the new leader is the change. Watkins (2003) notes that on average twelve employees are impacted by a new manager. This finding implies that what the new leader in transition does would affect a wide network of employees and, hence, performance within the organization. Since transformational leadership is deemed as critical for team performance, this research study seeks to examine the relationship between transformational leadership style and team effectiveness for new leaders in transition, with a special focus on professional knowledge-based work teams Problem / Opportunity Statement Most organizations in the current business climate are highly dependent on leaders to lead organizations to success. This dependence is especially so in the current high competitive business environment characterized by high leader turnover, frequent change, and high accountability to stakeholders (Grant, 2012; Hoffman, Bynum, Piccolo, & Sutton, 2011; Stewart, 1992). The problem is that organizations and leaders have failed to execute effective leadership transition action plans, which may lead to negative effects, such as leader stress, decreased productivity, higher turnover, and ineffective team performance (Gilmore, 2003). Understanding the role of transformational leadership in leadership transition and the impact that it has on team effectiveness would be an essential resource in understanding develop effective leadership transition plan. Both Wageman, Hackman, and Lehmen (2005), who proposed a model of team effectiveness in an organizational context, and Manderscheid and Ard ichvili (2008), who proposed a paired model integrating leadership transition theory that proposes effective team relationships are the result of successful leadership transitions, posit that transformational leadership style may be a critical success factor for team effectiveness and the success of new leaders (Appelbaum & Valero, 2007). Watkins (2004) maintained that, to accelerate the transition and build momentum, the new leader must have the ability to engage and influence many individuals throughout the organization â€Å"using vision, expertise and drive† (p. 16). Unlike well seasoned leaders who may have some understanding on what works in teams or how to handle various challenges that arise in newer teams that they are faced with, new leaders lack the experience of having to deal with such challenges. Most only have theoretical knowledge. Past literature have depicted transformational leadership as the most effective in enabling team performance and effectiveness (Wa geman, Hackman, and Lehmen, 2005). Although there is substantive research on leadership style and team effectiveness, there is less on new leader transition (Manderscheid & Ardichvili, 2008). Most of the research have focused on strategies to be employed in transitioning a leader (Manderscheid, 2008), formal interventions that organisations need to undertake in helping

Montana :: essays research papers

MONTANA BY LARRY WATSON EXTENDEND REPSONSE. 1) In his twelfth year, David discovers the pain of growing up- the fragmentation of the secure world of the innocent though the awareness of truths and realities around him. Discuss. ESSAY In the text Montana by Larry Watson, it is evident that they 12 year old David is growing up. He is a typical 12 year old, loving outdoors, riding his horse, fishing, hunting and exploring (Quote page 23), but by the influences and family around him he has a painful, confusing growing up life. As David an only child, he was not the only one that is growing up. In a way his family are still growing, learning from every part of past and present issues. David’s growing up has a lot of different influences. His father Wes is not a typically loving father. His fatherly love is harming David in a way to believe different in him and his self. Wes, David’s father, has a lot of responsibilities to cover, as he is the Mercer County sheriff. This makes David believe to look after him self and be responsible in a way to show and prove his father, as he disappoints David. (Quote page 17) Even though Wes is the sheriff he is a quite and self-effacing male who puts him self down and this shows that he isn’t the typical male stereotype of a Montana Sheriff. As the Hayden’s were well known and had heaps of power in Bentrock, David realises that he is respected because of his name, not because of himself. He didn’t have to earn it. (Quote page 126). David becomes aware of this when he is going to the grocery store, and that the locals didn’t know what was happening to his family of power. The citizens of Bentrock didn’t know that his father had arrested his own brother for sexually assaulting his patients, and murdering Marie. (Quote page 127) David had shame over his family name. Frank, Wes’ brother and David’s Uncle, has a great influence on David’s growing up. Frank shows his heroism and successfulness and this makes David envy Frank. (Quote page 78) Even though David idolised Frank, his views changed within the text. After the truth about Frank and his patients David didn’t like being alone with him. The thought his own uncle as a criminal. (Quote page 49) David changes his innocents when his is hunting and he shot and killed a magpie.

To Diet or Not to Diet

> When we hear the word dieting, we immediately think of losing weight, counting calories, avoiding fast food and other stereotype characteristics. But dieting is a word that enfolds a larger group of people, than only the ones that want to lose weight. The definition says a diet is a special course of food to which a person is restricted, either for weight control or for medical reasons. For whatever reason a diet is followed, when can we conclude it is or isn’t recommended to follow a diet? Only a small group of people are restricted to following a diet. Also consider reading: Role of Chemistry in Domestic Activities ProjectIt’s not the people we think of first, the ones who need to lose weight, but it’s the ones who need it for medical reasons or elite sports incentives. For all rest, people like you and me, it is rather a question if we really need a diet with restrictive prescriptions. Why not just learn how to maintain healthy habits and live by them like a so called easy lifetime diet? Dieting requires behavioral changes that are not easy to adopt or maintain in the long run. A dieting plan with a balanced intake of foods may reduce your risks for chronic diseases.On the other hand, if you do not plan carefully, dieting may increase your risk of nutritional deficiencies. It is recommended to consult your doctor before embarking upon any diet plan. When a diet is for medical reasons, the medical benefits are determinative for executing the diet. But what about personal reasons? The biggest benefit of dieting is that you can lose weight, especially when you also engage in physical activity. There’s a large amount of possible diet programs on the market.These diet plans may be effective in helping you lose weight in the short-term and lose even more weight in the long-term when you increase your adherence to the diet. But why engage in a prescriptive way of eating, if you can do it easily with just eating healthy and make that your way of living without over-thinking what and when you should eat? Having healthy food habits without being in some calorie-counting diet, can improve your physical health, particularly when you consume a balanced diet of foods, allowing you to obtain adequate amounts of essential nutrients.A healthy diet plan emphasizes whole foods, such as fruits, vegetables, nuts, whole grains, beans, fat-free or low-fat dairy products, eggs, fish, poultry and lean meat; it also minimizes sodium, added sugars, cholesterol, saturated fats and trans fats. Weight loss from maint aining healthy eat habits is associated with reduced risks of chronic conditions and diseases that include obesity, type 2 diabetes, cardiovascular disease, hypertension and cancer. It may also enhance your mental health and improve your self-esteem. And it works in the long term as it becomes your daily routine and at some point, you don’t even think about it anymore.The hard part about whether a diet or just eating healthy, is changing your eating behavior. At first, you may feel excited about the prospect of looking thinner and may adhere to the plan wholeheartedly. Over time, though, you may be tempted to eat the high-calorie foods you were used to eating before the diet. You may simply find the diet plan too restrictive to adhere to every day. Low rates of weight loss success are due to inability to adhere to dieting strategies in the long-term and that sustained adherence to reducing calories and increasing exercise is effective for establishing self-set dieting goals.T hat’s why a diet should be avoided. You might not have spectacular results in the short run, but in the long run you don’t find yourself struggling with just living the healthy life. Not only the fact you have to live by prescriptions, dieting may also cause medical problems. It can increase your risk of gallstones as rapid weight loss can result in a high probability of gallstone formation; they can occur even when prevention strategies are implemented. So called crash diets, is when energy intake is restricted by very low intake of energy, mostly by cutting down carbohydrates and fats, to lose weight quickly.The weight loss will occur, but other causes are the jojo effect (these diets can’t be maintained for a large period and as the body went into sleep mode with mostly loss of water, it tends to put on more weight after the diet), shortening in required nutrients, lack of energy and sleeping disorders. Automatically less bodily activity is done, what causes the breakdown of muscle tissue. In the long term, these diets only work against the goal of losing weight. Diets with smaller or no energy intake restriction and only a restriction of carbohydrates, cause a great weight loss as well but aren’t without danger either.Examples are the Atkins and South Beach diet. These diets contain a lot of saturated fat, what can lead to cardiovascular diseases. Because of the longer term, shortening of certain essential nutrients can occur. Dieting requires behavioral changes that are not easy to adopt or maintain in the long run. A dieting plan with a balanced intake of foods may reduce your risks for chronic diseases. On the other hand, if you do not plan carefully, dieting may increase your risk of nutritional deficiencies. It is recommended to consult your doctor before embarking upon any diet plan.As it might feel like a diet at start, weight control and other physical appearance incentives come automatically by just eating healthy, havi ng enough sleep and performing regularly in physical activity. It is about changing behavior and approach your goal judiciously – not jumping into some diet that offers you a quick solution for your primary goal, along with secondary consequences that may harm you more in the long run. Sources My education as a bachelor in nutrition and dietetics. http://webmd. com http://www. oxforddictionaries. com http//www. livestrong. com

F. Scott Fitzgerald s The Great Gatsby - 1408 Words

Maxim Sivolella The Great Gatsby Essay Symbolism In The Great Gatsby The Great Gatsby written in 1925 by American author F. Scott Fitzgerald follows a young man named Nick Carraway who has just moved to Long Island, New York. As the narrator of the novel, Nick recounts the summer he spent there in 1922 and the events that took place, especially his encounter with the young, rich, mysterious and extravagant Jay Gatsby. As Nick spends more time with Gatsby he learns that Gatsby has a romantically idealistic, yet unrealistic passion and infatuation for his beautiful cousin Daisy Buchanan. Widely regarded as Fitzgerald’s greatest work, the novel explores the ideas of blind idealism, excessive decadence and the moral decay of the 1920’s,†¦show more content†¦Eckleburg which are actually a pair of eyes painted on a billboard which hangs above the Valley of Ashes. They signify the eyes of god looking down and judging American society as it turns into an ethical and moral wasteland. The green light represents Gatsby’s idealistic hope for the future which can be associated as a parallel to the American dream. Just as Gatsby longs to recreate the past so do the American people who futilely attempt to relive a time where their dreams had value and when they could strive for a better future. The light is first mentioned early in the novel when Nick sees the figure of Gatsby reaching out across the bay towards the green, glowing light. For Gatsby, the light represents the future, a future where he and Daisy live together just like it was back in Louisville. Nick mentions that for Gatsby, â€Å"the dream must have seemed so close that he could hardly fail to grasp it.† However, in reality the green light represents the youthful joy of the past, like the green of a budding flower. Gatsby fails to recognize this as he desperately and blindly strives towards a single unobtainable goal, highlighted by the fact that when Nick tells him he can’t repeat the past he responds by stubbornly and naively sayin g, â€Å"Why of course you can.† This parallels the American dream as originally America was about individualism, the motto of hard work breeds success, and the pursuit of happiness. However easy money, moral decay,