convert excel to pdf using javascript

convert excel to pdf using javascript

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Yup; we re no better off than before, because all we ve done is to pass the responsibility up to the client, and they are still free to ignore our pleadings. Given that the problem is a result of our oversight in the first place, what is the likelihood that we ll remember to check the error message Things would be even worse if this was in a library; we could recompile against this new version, and everything would seem fine, while in the background everything would quietly be going horribly wrong. It is probably about time we did something with the error message, so let s see what happens in our client code (see Example 6-10).

static void Main(string[] args) { Turtle arthurTheTurtle = new Turtle { PlatformWidth = 0.0, PlatformHeight = 10.0, MotorSpeed = 5.0 }; ShowPosition(arthurTheTurtle); // We want to proceed forwards arthurTheTurtle.LeftMotorState = MotorState.Running; arthurTheTurtle.RightMotorState = MotorState.Running; // For two seconds TurtleError result = arthurTheTurtle.RunFor(2.0); if (result != TurtleError.OK) { HandleError(result); return; } ShowPosition(arthurTheTurtle);

The following code shows the stack example implemented using generics. Method Main defines two variables: StackInt and StackString. The two constructed types are created using int and string as the type arguments. class MyStack<T> { T[] StackArray; int StackPointer = 0; public void Push(T x) { if ( !IsStackFull ) StackArray[StackPointer++] = x; } public T Pop() { return ( !IsStackEmpty ) StackArray[--StackPointer] : StackArray[0]; } const int MaxStack = 10; bool IsStackFull { get{ return StackPointer >= MaxStack; } } bool IsStackEmpty { get{ return StackPointer <= 0; } } public MyStack() { StackArray = new T[MaxStack]; } public void Print() { for (int i = StackPointer -1; i >= 0 ; i--) Console.WriteLine(" Value: {0}", StackArray[i]); } }

// Now, let's rotate clockwise for a bit arthurTheTurtle.RightMotorState = MotorState.Reversed; // PI / 2 seconds should do the trick result = arthurTheTurtle.RunFor(Math.PI / 2.0); if (result != TurtleError.OK) { HandleError(result); return; } ShowPosition(arthurTheTurtle); // And let's go into reverse arthurTheTurtle.RightMotorState = MotorState.Reversed; arthurTheTurtle.LeftMotorState = MotorState.Reversed; // And run for 5 seconds result = arthurTheTurtle.RunFor(5); if (result != TurtleError.OK) { HandleError(result); return; } ShowPosition(arthurTheTurtle); // Then rotate back the other way arthurTheTurtle.RightMotorState = MotorState.Running; // And run for PI/4 seconds to give us 45 degrees result = arthurTheTurtle.RunFor(Math.PI / 4.0); if (result != TurtleError.OK) { HandleError(result); return; } ShowPosition(arthurTheTurtle); // And finally drive backwards for a bit arthurTheTurtle.RightMotorState = MotorState.Reversed; arthurTheTurtle.LeftMotorState = MotorState.Reversed; result = arthurTheTurtle.RunFor(Math.Cos(Math.PI / 4.0)); if (result != TurtleError.OK) { HandleError(result); return; } ShowPosition(arthurTheTurtle); } Console.ReadKey();

private static void HandleError(TurtleError result)

{ }

The names of the properties (firstName and lastName) must be strings and must be enclosed in double quotes. Compare the previous code with the following, which represents a similar object:

Console.WriteLine("We hit turtle error {0}", result); Console.ReadKey();

class Program { static void Main() { MyStack<int> StackInt = new MyStack<int>(); MyStack<string> StackString = new MyStack<string>(); StackInt.Push(3); StackInt.Push(5); StackInt.Push(7); StackInt.Print(); StackString.Push("This is fun"); StackString.Push("Hi there! "); StackString.Print(); } } This code produces the following output: Value: Value: Value: Value: Value: 7 5 3 Hi there! This is fun

Every time we call the RunFor method, we have to stash away the error message that is returned, check it for problems, and then decide what we re going to do. In this instance, we decided to quit the application, after showing an error message to the user, because it isn t safe to continue. If we compile and run, here s the output:

Arthur is at (0,0) and is pointing at angle 0.00 radians. Arthur is at (0,10) and is pointing at angle 0.00 radians. We hit turtle error RotateError

From an application point of view, this is much better behavior than before: we were able to stop when we hit our first problem. Unfortunately, we had to write quite a lot of boilerplate code to achieve that end, and our code is much less readable than it was before. We also created a huge number of potential exit points out of our function, which decreases its maintainability. So while it is better, I m not totally happy with it; this is catching just one potential error from one function, and we have almost as many lines of code dealing with that as we do our success scenario, scattered throughout our whole program!

So we finally spotted the problem, and stopped it from causing trouble. How do we find out what is wrong Well, first we should take a look at the error message. That tells us that it has something to do with rotating the turtle, which gives us a bit of a clue. The easiest way to see what is really going on, though, might be to set a breakpoint in our error handler and see what state the system is in when the error occurs. To set a breakpoint, we can put the cursor on the line where we want to break into the debugger, and press F9. Figure 6-1 shows the code with a breakpoint set.

Table 19-1 summarizes some of the differences between the initial non-generic version of the stack and the final generic version of the stack. Figure 19-8 illustrates some of these differences. Table 19-1. Differences Between the Non-Generic and Generic Stacks

If we run this now, the application will break into the debugger when we hit our error handler. If we press Ctrl-Alt-C, we can inspect the call stack to see where we went wrong, as shown in Figure 6-2.

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