Python struct.pack()数据范围错误
Python struct.pack() data range error
我正在使用 python2.7,我有这段代码。数据值的范围是 0 到 65792。
data_length=30
code=202
data=[51400,31400,100,51400,31400,100,51400,31400,100]
checksum = 0
total_data = ['$', 'M', '<', data_length, code] + data
for i in struct.pack('<2B%dh' % len(data), *total_data[3:len(total_data)]):
checksum = checksum ^ ord(i)
total_data.append(checksum)
try:
b = None
b = self.ser.write(struct.pack('<3c2B%dhB' % len(data), *total_data))
except Exception, error:
print "\n\nError in sendCMD."
print "("+str(error)+")\n\n"
pass
struct.pack('<2B%dh' % len(data), *total_data[3:len(total_data)]):
并给我这个错误:
for i in struct.pack('<2B%dh' % len(data), *total_data[3:len(total_data)]):
struct.error: short format requires SHRT_MIN <= number <= SHRT_MAX
SHRT_MAX
定义为 0x7FFF (32767),因为短裤已签名:https://en.wikibooks.org/wiki/C_Programming/C_Reference/limits.h
也许你想要 unsigned short? H
在 struct.pack
中:https://docs.python.org/2/library/struct.html#format-characters
编辑:即便如此,最大范围 (65792) 的值也会溢出 unsigned short——您需要更大的容器,例如 int (i
) 或 unsigned int (I
) 使用这些值
我正在使用 python2.7,我有这段代码。数据值的范围是 0 到 65792。
data_length=30
code=202
data=[51400,31400,100,51400,31400,100,51400,31400,100]
checksum = 0
total_data = ['$', 'M', '<', data_length, code] + data
for i in struct.pack('<2B%dh' % len(data), *total_data[3:len(total_data)]):
checksum = checksum ^ ord(i)
total_data.append(checksum)
try:
b = None
b = self.ser.write(struct.pack('<3c2B%dhB' % len(data), *total_data))
except Exception, error:
print "\n\nError in sendCMD."
print "("+str(error)+")\n\n"
pass
struct.pack('<2B%dh' % len(data), *total_data[3:len(total_data)]):
并给我这个错误:
for i in struct.pack('<2B%dh' % len(data), *total_data[3:len(total_data)]):
struct.error: short format requires SHRT_MIN <= number <= SHRT_MAX
SHRT_MAX
定义为 0x7FFF (32767),因为短裤已签名:https://en.wikibooks.org/wiki/C_Programming/C_Reference/limits.h
也许你想要 unsigned short? H
在 struct.pack
中:https://docs.python.org/2/library/struct.html#format-characters
编辑:即便如此,最大范围 (65792) 的值也会溢出 unsigned short——您需要更大的容器,例如 int (i
) 或 unsigned int (I
) 使用这些值