itextsharp barcode vb net The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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Error message showing an assertion failure
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this case, there is a simple if statement that evaluates the condition and shows an alert if the condition evaluates to false In C++, ASSERT() is usually defined as a macro that expands during the precompile phase, like this:
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#define ASSERT(bCondition) if (f) {} \ else { \ /* Platform-specific error display code here */ \ /* just print the error to whatever stderr is */ \ fflush(NULL); /* flush open buffer before calling abort() */ \ fprintf(stderr, "Assertion failed! File: %s, Line: %d", \ _ _FILE_ _, _ _LINE_ _); \ fflush(stderr); \ abort();\ }
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ASSERT() is usually defined to be a debug-only macro or function, and release-quality code has the ASSERT() macro defined to be an empty function This is so that, in practice, the release version of the code runs a little faster (because the code to do all the condition checking is absent), and the user doesn t see frightening ASSERT() failure messages when things go wrong or when the programmer uses ASSERT() incorrectly
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In this case, the ASSERT() macro also evaluates the condition and displays an error to the stderr output stream Most common development environments today define the _ _FILE_ _ and _ _LINE_ _ macros to be the current file and line of the source code where ASSERT was called In case you re wondering, that empty if() section at the start of the macro is not a mistake: it has to be there to prevent dangling if-else situations For example, guess what will happen if you define ASSERT() as
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#define ASSERT(bCondition) if (!f) { \ fflush(NULL); \ fprintf(stderr, "Assertion failed! File: %s, Line: %d", \ _ _FILE_ _, _ _LINE_ _); \ fflush(stderr); \ abort();\ }
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and you try to use it in the following code snippet:
if (someExpression) ASSERT(someCondition); else everythingIsOK();
The else clause will never execute in the way it was intended Why Because it is being paired up with the if clause defined in the ASSERT() macro Remember, the ASSERT() macro gets expanded in place in the code, which can have unforeseen consequences Using the if-else form in the macro definition prevents this problem from happening
Using ASSERT() Effectively
In general, the ASSERT() function should be used to catch conditions in the code that are illegal and should never happen during the normal course of the program s execution For example, consider the following JavaScript function:
function getTextNodeData(objNode) { return objNodedata; }
This function seems innocent enough: it simply returns the data property of a Text node (recall from 2 that Text nodes inherit from the CharacterData interface, which provides the data property) There s just one not-so-small problem with this code: it may not have been passed a Text node in the first place Of course, you could just add some error-checking code, like this:
function getTextNodeValue(objNode) { if (objNodenodeType == 3) // 3 means text node
The Document Object Model: Processing Structured Documents
return objNodedata; else return ""; }
However, then you re just masking the problem, which is that somewhere in your code you may be asking for the value of a Text node that isn t a Text node This code does nothing to help you find this problem; in fact, it only hides it from you even further because it isn t clear why an empty string was returned Did the function return an empty string because the text node had no content Was it because there was an error somewhere in the function This becomes even more of a problem when someone who s unfamiliar with the code tries to use this nifty getTextNodeData() function that you ve written, only to get back an empty string There s no quick way to tell exactly what s happening without tracking down your function and determining how it works, which, in turn, slows down development
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