PythoncTypes传入指针并返回结构

这是一个简单的例子，在解决一个实际有用的问题之前，我一直在努力工作。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;
}

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

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

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

上面的代码完全按照我的预期工作，我的指针进入并被修改，我得到了我的整数。当我试图用C创建一个geoTime结构并将其返回给Python时，问题就出现了

在C中添加/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;

}

修改的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

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

一旦我像这样更改代码，C代码就会进入myTime而不是Python中的信息，返回值会被放入now_geoTime而不是test中。对可能出现的问题有什么想法吗？看起来python代码没有按照我预期的方式执行某些操作，因为C代码似乎能够正确处理传入的值

最后一个示例的输出：

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

Python Now:1336404920.77 Python地理时间：1336404920 773674011 *************输入C******************** 时间：90500-17037640 MyTime:-17037640-17037640 retValue:314 159 *************退出C********************** 现修改地理时间：314159 试验类型： 测试信息：137096800 134497384

---

任何想法都将不胜感激，我一直在努力让这项工作已经有一段时间了。提前谢谢

我切换到64位python/64位DLL，问题就解决了。当我觉得有点灵感时，我可能会尝试将它分离到编译器、操作系统或python，但现在我将使用它来运行。

我对您的代码进行了一次尝试，与您的代码完全一样。我得到了您想要的正确输出。所以我只能说我相信你的代码是正确的；这可能是编译器或平台问题。好的，谢谢。经过一番挖掘，我发现出于某种原因，从我编译的库返回结构根本不起作用。现在，我将假设对于我需要返回结构的几个方法，我将在C端包装它，以便从堆中malloc一些内存，并返回一个带有结构副本的指针。我可能会尝试查看用于返回结构的编译器选项，看看其中是否有我注意到的内容。如果其他人有什么想法，我愿意接受