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Figure 14.7 shows what happens when we click the Polygon. The point is that Shapes are pretty capable objects. They have all the things that the various controls we ve used have, such as binding and layout support, events, and so on, which makes them pretty easy to work with. They also work nicely with control templates, as we demonstrated with the calculator. But, there s a downside to using

The attrib parameter determines the type of files to be found by findfirst( ) If attrib is 0, all types of files that match the desired filename are acceptable To cause a more selective search, attrib can be one the following macros:

12

The findnext( ) function continues a search started by findfirst( ) Both the findfirst( ) and findnext( ) functions return 0 on success and 1 on failure On failure, errno is set to ENOENT (filename not found) _doserrno is set to either ENMFILE (no more files in directory) or ENOENT

Figure 14.7 We add a handler to the Polygon for when the user clicks it. We can do this because Shapes are full-blown UIElements.

This program displays all files with a CPP extension (and their sizes) in the current working directory:

.

#include <stdioh> #include <dosh> #include <dirh> int main(void) { struct ffblk f; register int done;

16:

hundreds of shapes, you ll end up putting a lot of overhead on WPF, making your UI memory-intensive and sluggish. If you re going to do more than put a few shapes in a UI, you should probably consider one of the other available approaches. For the moment, we ll demonstrate using Shapes to create a first version of a graphing control.

done = findfirst("*cpp", &f, 0); while(!done) { printf("%s %ld\n", fff_name, fff_fsize); done = findnext(&f); } return 0; } THE C++ BUILDER FUNCTION LIBRARY