上面已经说了，string的传入传出。

那么。当我们二进制输入输出怎么做呢？

根据官方说明：http://www.swig.org/Doc3.0/Python.html#Python_nn77

In some cases, users may wish to instead handle all byte strings as bytes objects in Python 3. This can be accomplished by adding SWIG_PYTHON_STRICT_BYTE_CHAR to the generated code:

%module char_to_bytes
%begin %{
#define SWIG_PYTHON_STRICT_BYTE_CHAR
%}char *charstring(char *s) {return s;
}

This will modify the behavior so that only Python 3 bytes objects will be accepted and converted to a C/C++ string, and any string returned from C/C++ will be converted to a bytes object in Python 3:

>>> from char_to_bytes import *
>>> charstring(b"hi") # Byte string
b'hi'
>>> charstring("hi")  # Unicode string
Traceback (most recent call last):File "<stdin>", line 1, in ?
TypeError: in method 'charstring', argument 1 of type 'char *'

我们修改文件：

C -->
#include "string.h"
#include <stdlib.h>
#include <stdio.h>char * get_str(char * str1)
{return str1;
}
char * get_str_addheader(char * str1)
{char * odata=(char *)malloc(100);sprintf(odata,"%s:%s","Header",str1);return odata;
}
char * get_str_inputbytes(char * str1,int len)
{char * odata=(char *)malloc(100);sprintf(odata,"%s:%s","Header",str1);return odata;
}
<--i-->
%module tsm%apply (char *STRING, int LENGTH) { (char * str1,int len) };%header%{#define SWIG_PYTHON_STRICT_BYTE_CHAR
%}%{
//头文件
extern char * get_str(const char * str1);
extern char * get_str_addheader(char * str1);
extern char * get_str_inputbytes(char * str1,int len);
%}
%newobject get_str_addheader;
extern char * get_str(const char * str1);
extern char * get_str_addheader(char * str1);
extern char * get_str_inputbytes(char * str1,int len);
<--

编译之后进行测试：

当加入

%header%{#define SWIG_PYTHON_STRICT_BYTE_CHAR
%}

输入变为byte,可以进行二进制处理。

但是，还是会遇到00会有结束。我们需要继续查看文档。。,处理呕吐打他