您对PicamCameraID结构的定义不正确：sensor_name并且serial_number是arrays：
"""
struct PicamCameraID {
PicamModel model;
PicamComputerInterface computer_interface;
pichar sensor_name[PicamStringSize_SensorName];
pichar serial_number[PicamStringSize_SerialNumber];
};
"""
import ctypes as c
PicamStringSize_SensorName = PicamStringSize_SerialNumber = 64
PicamModel = PicamComputerInterface = c.c_int
pichar = c.c_char
class PicamCameraID(c.Structure):
_fields_ = [("model", PicamModel),
("computer_interface", PicamComputerInterface),
("sensor_name", pichar * PicamStringSize_SensorName),
("serial_number", pichar * PicamStringSize_SerialNumber)]
似乎第二个参数只是一个字符串，因此您无需对其进行应用pointer()。这是功能的ctypes原型Picam_ConnectDemoCamera()：
"""
Picam_ConnectDemoCamera(PicamModel model, const pichar* serial_number,
PicamCameraID* id)
"""
pichar_p = c.c_char_p # assume '\0'-terminated C strings
Picam_ConnectDemoCamera.argtypes = [PicamModel, pichar_p,
c.POINTER(PicamCameraID)]
Picam_ConnectDemoCamera.restype = c.c_int # assume it returns C int
调用它：
picam_id = PicamCameraID()
rc = Picam_ConnectDemoCamera(2, "serial number here", c.byref(picam_id))
print(rc)
print(picam_id.sensor_name.value) # C string
print(picam_id.sensor_name.raw) # raw memory
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