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test.c(动态库源代码)
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[cpp] view plain copy
// 编译生成动态库: gcc -g -fPIC -shared -o libtest.so test.c
#include stdio.h
#include string.h
#include stdlib.h
typedef struct StructPointerTest
{
char name[20];
int age;
}StructPointerTest, *StructPointer;
StructPointer test() // 返回结构体指针
{
StructPointer p = (StructPointer)malloc(sizeof(StructPointerTest));
strcpy(p-name, "Joe");
p-age = 20;
return p;
}
编译：gcc -g -fPIC -shared -o libtest.so test.c
call.py(python调用C语言生成的动态库):
[python] view plain copy
#!/bin/env python
# coding=UTF-8
from ctypes import *
#python中结构体定义
class StructPointer(Structure):
_fields_ = [("name", c_char * 20), ("age", c_int)]
if __name__ == "__main__":
lib = cdll.LoadLibrary("./libtest.so")
lib.test.restype = POINTER(StructPointer)
p = lib.test()
print "%s: %d" %(p.contents.name, p.contents.age)
最后运行结果：
[plain] view plain copy
[zcm@c_py #112]$make clean
rm -f *.o libtest.so
[zcm@c_py #113]$make
gcc -g -fPIC -shared -o libtest.so test.c
[zcm@c_py #114]$./call.py
Joe: 20
[zcm@c_py #115]$
int* GrabImage();
int GetPixel(int* image, int x, int y);
void SetPixel(int* image, int x, int y, int color);
在计算机程序设计中，回调函数，或简称回调（Callback），是指通过函数参数传递到其它代码的，某一块可执行代码的引用。这一设计允许了底层代码调用在高层定义的子程序：
例如：
def my_callback(input):
print "function my_callback was called with %s input" % (input,)
def caller(input, func):
func(input)
for i in range(5):
caller(i, my_callback)
执行结果是：
function my_callback was called with 0 input
function my_callback was called with 1 input
function my_callback was called with 2 input
function my_callback was called with 3 input
function my_callback was called with 4 input