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1.1 misho 3: Of course, not only strings can be specified in the configuration file.
4: libConfuse can parse strings, integers, booleans and floating point values.
5: These are the fundamental values, and they are all also available as lists.
6: We'll talk more about lists in the next chapter.
7: </p><p>
8: The macros used to initialize a string, integer, boolean and a
9: float is, respectively, <code class="function">CFG_STR()</code>,
10: <code class="function">CFG_INT()</code>, <code class="function">CFG_BOOL()</code>,
11: <code class="function">CFG_FLOAT()</code> and
12: <code class="function">CFG_PTR()</code>. All macros take three parameters:
13: the name of the option, a default value and flags. To retrieve the
14: values, use <code class="function">cfg_getstr()</code>,
15: <code class="function">cfg_getint()</code>,
16: <code class="function">cfg_getbool()</code>,
17: <code class="function">cfg_getfloat()</code> or
18: <code class="function">cfg_getptr()</code>, respectively.
19: </p><p>
20: Let's introduce an integer option that tells us how many times to print the
21: greeting:
22: </p><a id="listing3"></a><pre class="programlisting">
23: 1 #include <stdio.h>
24: 2 #include <confuse.h>
25: 3
26: 4 int main(void)
27: 5 {
28: 6 cfg_opt_t opts[] =
29: 7 {
30: 8 CFG_STR("target", "World", CFGF_NONE),
31: 9 CFG_INT("repeat", 1, CFGF_NONE),
32: 10 CFG_END()
33: 11 };
34: 12 cfg_t *cfg;
35: 13 int repeat;
36: 14
37: 15 cfg = cfg_init(opts, CFGF_NONE);
38: 16 if(cfg_parse(cfg, "hello.conf") == CFG_PARSE_ERROR)
39: 17 return 1;
40: 18
41: 19 repeat = cfg_getint(cfg, "repeat");
42: 20 while(repeat--)
43: 21 printf("Hello, %s!\n", cfg_getstr(cfg, "target"));
44: 22
45: 23 cfg_free(cfg);
46: 24 return 0;
47: 25 }
48: 26
49: </pre><p>
50: Here we have used the <code class="function">CFG_INT()</code> macro to
51: initialize an integer option named "repeat". The default value is 1
52: as in the standard greeting. The value is retrieved with
53: <code class="function">cfg_getint()</code>.
54: </p><p><a id="negative-repeat-problem"></a>
55: But, wait a moment, what if the user specified a negative value for
56: "repeat"? Or a too large positive value? libConfuse can handle
57: that with a so-called validating callback. We'll come back to this
58: problem later on, but we will first take a look at lists.
1.1.1.2 ! misho 59: </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="ar01s03.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">libConfuse tutorial </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 3. Introducing lists</td></tr></table></div></body></html>
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