Python的ctypes的传递指针和获取结构返回(Python Ctypes Passing in

这是一些简单的例子，我试图得到解决一个实际有用的问题之前工作。 C代码：

typedef struct {
  uint32_t seconds;
  uint32_t nanoseconds;
} geoTime;

int myTest(geoTime *myTime){
  printf("Time: %d %d\n", myTime->seconds, myTime->nanoseconds);
  myTime->seconds = myTime->nanoseconds;
  geoTime T = {314, 159};
  printf("MyTime: %d %d      retValue: %d %d\n", myTime->seconds, myTime->nanoseconds, T.seconds, T.nanoseconds);
  return 314;
}

在Python代码：

import ctypes
import time
import math

lib_astro = ctypes.CDLL("libastroC.so")

class geoTime(ctypes.Structure):
    _fields_ = [("seconds", ctypes.c_uint),
                ("nanoseconds", ctypes.c_uint)]  

now = time.time()
print "Python Now: ", now

now_geoTime = geoTime()
now_geoTime.seconds = ctypes.c_uint(int((math.floor(now))))
now_geoTime.nanoseconds = ctypes.c_uint(int(math.floor(math.modf(now)[0] * 1000000000)))
print "Python geoTime now:", now_geoTime.seconds, now_geoTime.nanoseconds

lib_astro.myTest.argtypes = [ctypes.POINTER(geoTime)]
lib_astro.myTest.restype = geoTime
print "************* ENTERING C ********************"
test = lib_astro.myTest(ctypes.byref(now_geoTime))
print "************* EXITING C **********************"
print "Modified now_geoTime: ",now_geoTime.seconds, now_geoTime.nanoseconds
print "test: ",test

输出：

Python Now:  1336401085.43
Python geoTime now: 1336401085 432585000
************* ENTERING C ********************
Time: 1336401085 432585000
MyTime: 432585000 432585000      retValue: 314 159
************* EXITING C **********************
Modified now_geoTime:  432585000 432585000
test:  314

上面的代码工作正是我所期望的，我的指针进入了和被修改，我让我的整数回来。当我尝试创建在C geoTime结构和返回回Python中的问题发生。

用C添加/修改代码：

geoTime patTest(geoTime *myTime){
    printf("Time: %d %d\n", myTime->seconds, myTime->nanoseconds);
    myTime->seconds = myTime->nanoseconds;
    geoTime T = {314, 159};
    printf("MyTime: %d %d      retValue: %d %d\n", myTime->seconds, myTime->nanoseconds, T.seconds, T.nanoseconds);
    return T;

}

修改Python代码：

lib_astro.patTest.argtypes = [ctypes.POINTER(geoTime)]
lib_astro.patTest.restype = geoTime
print "************* ENTERING C ********************"
test = lib_astro.patTest(ctypes.byref(now_geoTime))
print "************* EXITING C **********************"
print "Modified now_geoTime: ",now_geoTime.seconds, now_geoTime.nanoseconds
print "Type of test: ",test
print "Information in test: ", test.seconds, test.nanoseconds

有一次，我改变这样的C代码得到废话成指明MyTime对应，而不是从Python的信息和返回值我的代码被放置到now_geoTime，而不是测试。什么任何想法可能是想错了？它看起来像Python代码没有做什么我期望，因为C代码似乎与获得传递的值正常工作的方式。

从上个示例的输出：

Python Now:  1336404920.77
Python geoTime now: 1336404920 773674011
************* ENTERING C ********************
Time: 90500 -17037640
MyTime: -17037640 -17037640      retValue: 314 159
************* EXITING C **********************
Modified now_geoTime:  314 159
Type of test:  <__main__.geoTime object at 0x82bedf4>
Information in test:  137096800 134497384

任何想法将不胜感激，我一直试图让这个到现在相当长一段时间的工作。提前致谢！

我切换到64位蟒蛇/ 64位的DLL和问题走了。当我感到有点更加激发了我可能会尝试将其隔离到编译器，操作系统或Python，但现在我要运行它。