尝试使用正确的定义：
class MODULEENTRY32(Structure): _fields_ = [( 'dwSize' , DWORD ) , ( 'th32ModuleID' , DWORD ), ( 'th32ProcessID' , DWORD ), ( 'GlblcntUsage' , DWORD ), ( 'ProccntUsage' , DWORD ) , ( 'modbaseAddr' , POINTER(BYTE) ) , ( 'modbaseSize' , DWORD ) , ( 'hModule' , HMODULE ) , ( 'szModule' , c_char * 256 ), ( 'szExePath' , c_char * 260 ) ]
