我有一个用ctypes包装在Python中的C库，我在下面有这个DLL，当我要求时打印出时间值。 但不是通过每个项目并手动要求它打印出50000个值的时间。 我想我创建了一个for循环，但它无法正常工作。 
 
 这是我的代码的一个小例子： 
 
import ctypes
from ctypes import *

MultiF = (b'path_to_file')   
dll = CDLL('path_to_dll') 

PN = ctypes.c_char_p(b'Paramter_name')
startTime = ctypes.c_double(-value)
stopTime = ctypes.c_double(value)
DT_RETURN = 0x0100
DT_FLOAT = 0x0001
convertType = (DT_RETURN|DT_FLOAT)
Null = 0


dll.readSParm.argtypes = (POINTER(SFile), c_char_p, c_double, c_double, c_double, POINTER(TTag), c_ushort,)   
dll.readSParm.restype = POINTER(SParm)

g = dll.readSParm(f, PN, startTime, stopTime, Null, None, convertType)

print(g[0].time[0])
print(g[0].time[1])
print(g[0].time[50000])
 
 这些是代码给我的返回值： 
 
-1031.0762939453125
-1031.0362548828125
0.0
 
 我想最终把所有这些数字都放到一个数组中去绘制。 所以我创建了一个失败的for循环： 
 
time = (g[0].time)
for i in time:
    print(time[1])
 
 这只会反复打印第一个值，直到Python崩溃。 我的问题是：如何让它在循环中运行并打印出所有50000个值？ 
 
 编辑 
 
 这有效： 
 
 time = (g[0].time)
 for i in time:
    print(i)
 
 但随后它崩溃了Python 

I have a C library that i wraped in Python with ctypes and I have this DLL below that prints out the time values when i ask it to. But rather than going through each item and manually asking it to print out 50000 values for time. I think i created a for loop, but it doesn't work properly.
 
Here is a small example of my code:
 
import ctypes
from ctypes import *

MultiF = (b'path_to_file')   
dll = CDLL('path_to_dll') 

PN = ctypes.c_char_p(b'Paramter_name')
startTime = ctypes.c_double(-value)
stopTime = ctypes.c_double(value)
DT_RETURN = 0x0100
DT_FLOAT = 0x0001
convertType = (DT_RETURN|DT_FLOAT)
Null = 0


dll.readSParm.argtypes = (POINTER(SFile), c_char_p, c_double, c_double, c_double, POINTER(TTag), c_ushort,)   
dll.readSParm.restype = POINTER(SParm)

g = dll.readSParm(f, PN, startTime, stopTime, Null, None, convertType)

print(g[0].time[0])
print(g[0].time[1])
print(g[0].time[50000])
 
these are the return values that the code give me:
 
-1031.0762939453125
-1031.0362548828125
0.0
 
I want to eventually get all of these number into an array to be graphed. So I created a for loop that is failing:
 
time = (g[0].time)
for i in time:
    print(time[1])
 
This only prints the first value over and over and over again until Python crashes. My question in this: How can I get it to run on a loop and print out all 50000 values?
 
Edit
 
This works:
 
 time = (g[0].time)
 for i in time:
    print(i)
 
but then it crashes Python

原文：https://stackoverflow.com/questions/45064471