[issue5074] python3 and ctypes, script causes crash

[Gabriel Genellina]

Gabriel Genellina <gagsl-py2 at yahoo.com.ar> added the comment:

3rd argument to GetEnvironmentVariableW is the buffer size in 
*characters*, not bytes. Your buffer has room for 20 characters only, 
not 40. You should use create_unicode_buffer instead.

Probably the names create_unicode_buffer/create_string_buffer should be 
revised in 3.x

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nosy: +gagenellina

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