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If the second argument is given as the macro TRUE, the interpreter will die if it encounters a fatal error, just as Perl would in normal (that is, non-evaled) code. Rather than letting the interpreter abort, we can choose to handle the error ourselves in C if the second argument of eval_pv is changed to FALSE. This makes eval_pv behave exactly like Perl s eval, and we can check the value of the special variable $@ via the macro ERRSV: eval_pv("This is not Perl!",FALSE); if (SvTRUE(ERRSV)) { printf ("Error from eval: %s\n", SvPV(ERRSV, PL_na)) ; } The Perl eval function returns a value, although we are not obliged to use it. Since eval_pv is eval in C, it also returns a value, which allows us to write strscalar=eval_pv("'Number' '.int), FALSE); if (! SvTRUE(ERRSV)) { strval = SvPV(strscalar,PL_na); } eval_pv is really a wrapper for the more generic eval_sv, which evaluates the string part of a scalar value. In other words, it is equivalent to eval_sv(newSVpv("$int=5",0), FALSE); The means by which we get values back from the interpreter varies depending on what kind of data type we are looking for. Here we are dealing with scalars and used the SvIV and SvPV macros to extract C data types from the Perl scalar. We will take a closer look at working with scalars next and then go on to consider arrays, hashes, and complex data structures.

Using an XML file or some other file structure is not feasible in all situations For example, if you have a mapping application and need to store mapping data to support some offline use cases, you may not be able to put this information in XML files and deliver the user experience your users expect In situations where smart client applications need to handle large sets of data, it makes sense to consider using a client-side database Years ago, Microsoft released Microsoft SQL Server Desktop Engine (MSDE) for thick clients that were deployed with a local database MSDE is essentially SQL Server without the administrative tools (for example, Enterprise Manager) The good news is that MSDE can be distributed royalty-free, and you get all the SQL capabilities that you get with the real SQL Server In addition, several free administrative tools, similar to Enterprise Manager, are available for download.

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The get_sv function extracts a scalar variable from the symbol table of the interpreter As scalars are composite values, the return type is a pointer to an SV short for scalar value the C data type of a Perl scalar We can only extract package variables this way, so if we had declared $int and $str with my, we would not be able to extract them get_sv returns a pointer to an SV, which is the Perl data type for a scalar From this we can extract any of the value slots such as integer, floating-point number, or string using an appropriate macro SvIV extracts the integer value as we have already seen, while SvNV extracts the floating-point value SvPV is a little different, since it returns a pointer to a string We pass the special value PL_na to tell Perl we don t care how long the string is.

public void requestFailed(final String message) { UiApplication.getUiApplication().invokeLater(new Runnable() { public void run() { Dialog.alert("Request failed. Reason: " + message); } }); }

We could also use SvPV_nolen instead of SvPV to similar effect: strval = SvPV(strscalar, PL_na); strval = SvPV_nolen(strscalar); The second FALSE argument to get_sv indicates that no space should be allocated for this variable If we used TRUE, we could create the scalar in the symbol table at the same time Specifically, it will create a scalar if not already present and return a pointer to it: newscalar = get_sv("doesnotexistyet", TRUE); We would more likely want to use newSVpv, newSViv or one of their many variants to give the new variable a value at the same time Note that unlike the preceding, the following statements create the data structure but do not add it to the symbol table, so the interpreter will not be able to see them yet: intscalar fltscalar strscalar strscalar = = = = newSViv(6); newSVnv(3.

14159); newSVpv("Number 6", 0); newSVpvf("Number %d", 6); /* /* /* /* integer */ floating point */ 0=calculate length */ printf-style */.

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