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vscanf, vfscanf, vsscanf [C++ Reference]
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<h2><a name="vscanf_vfscanf_vsscanf" id="vscanf_vfscanf_vsscanf">vscanf, vfscanf, vsscanf</a></h2>
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<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <cstdarg></span>
<span class="co2">#include <cstdio></span>
<span class="kw4">int</span> vscanf<span class="br0">(</span> <span class="kw4">char</span> <span class="sy0">*</span>format<span class="sy0">,</span> va_list arg_ptr <span class="br0">)</span><span class="sy0">;</span>
<span class="kw4">int</span> vfscanf<span class="br0">(</span> FILE <span class="sy0">*</span>stream<span class="sy0">,</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy0">*</span>format<span class="sy0">,</span> va_list arg_ptr <span class="br0">)</span><span class="sy0">;</span>
<span class="kw4">int</span> vsscanf<span class="br0">(</span> <span class="kw4">char</span> <span class="sy0">*</span>buffer<span class="sy0">,</span> <span class="kw4">char</span> <span class="sy0">*</span>format<span class="sy0">,</span> va_list arg_ptr <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
These functions are very much like scanf(), fscanf(), and sscanf(). The
difference is that the argument list is a pointer to a list of arguments.
va_list is defined in cstdarg, and is also used by <a href="../../c/other/va_arg.html" class="wikilink1" title="c:other:va_arg">va_arg</a>. For example:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="kw4">int</span> scanf_<span class="br0">(</span> <span class="kw4">char</span> <span class="sy0">*</span>fmt<span class="sy0">,</span> ... <span class="br0">)</span> <span class="br0">{</span>
va_list args<span class="sy0">;</span>
va_start<span class="br0">(</span> args<span class="sy0">,</span> fmt <span class="br0">)</span><span class="sy0">;</span>
<span class="kw4">int</span> r <span class="sy0">=</span> vscanf<span class="br0">(</span>frmt<span class="sy0">,</span> args<span class="br0">)</span><span class="sy0">;</span>
scanf<span class="br0">(</span><span class="st0">"%*[^<span class="es1">\n</span>]"</span><span class="br0">)</span><span class="sy0">,</span> getchar<span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span> <span class="co1">//Empty buffer</span>
va_end<span class="br0">(</span> args <span class="br0">)</span><span class="sy0">;</span>
<span class="kw1">return</span> r<span class="sy0">;</span>
<span class="br0">}</span></pre>
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