Variable size/Set: Difference between revisions

=={{header|Python}}==

For compatibility with the calling conventions of external C functions, the [http://docs.python.org/library/ctypes.html?highlight=ctypes#module-ctypes ctypes module] has functions that map data types and sizes between Python and C:

<table class="docutils" border="1">

<tr>

<th class="head">ctypes type</th>

<th class="head">C type</th>

<th class="head">Python type</th>

</tr>

<tr>

<td>c_char</td>

<td>char</td>

<td>1-character string</td>

</tr>

<tr>

<td>c_wchar</td>

<td>wchar_t</td>

<td>1-character unicode string</td>

</tr>

<tr>

<td>c_byte</td>

<td>char</td>

<td>int/long</td>

</tr>

<tr>

<td>c_ubyte</td>

<td>unsigned char</td>

<td>int/long</td>

</tr>

<tr>

<td>c_short</td>

<td>short</td>

<td>int/long</td>

</tr>

<tr>

<td>c_ushort</td>

<td>unsigned short</td>

<td>int/long</td>

</tr>

<tr>

<td>c_int</td>

<td>int</td>

<td>int/long</td>

</tr>

<tr>

<td>c_uint</td>

<td>unsigned int</td>

<td>int/long</td>

</tr>

<tr>

<td>c_long</td>

<td>long</td>

<td>int/long</td>

</tr>

<tr>

<td>c_ulong</td>

<td>unsigned long</td>

<td>int/long</td>

</tr>

<tr>

<td>c_longlong</td>

<td>__int64 or long long</td>

<td>int/long</td>

</tr>

<tr>

<td>c_ulonglong</td>

<td>unsigned __int64 or

unsigned long long</td>

<td>int/long</td>

</tr>

<tr>

<td>c_float</td>

<td>float</td>

<td>float</td>

</tr>

<tr>

<td>c_double</td>

<td>double</td>

<td>float</td>

</tr>

<tr>

<td>c_longdouble</td>

<td>long double</td>

<td>float</td>

</tr>

<tr>

<td>c_char_p</td>

<td>char * (NUL terminated)</td>

<td>string or None</td>

</tr>

<tr>

<td>c_wchar_p</td>

<td>wchar_t * (NUL terminated)</td>

<td>unicode or None</td>

</tr>

<tr>

<td>c_void_p</td>

<td>void *</td>

<td>int/long or None</td>

</tr>

</table>