将具有十六进制值的符号常量添加到Python扩展模块 [英] Adding symbolic constants with hex values to Python extension module

问题描述

我的头文件中有一些定义为符号常量的值:

I have a few values defined as symbolic constants in my header file:

#define NONE 0x00
#define SYM  0x11
#define SEG  0x43
... 

这些值的名称表示某种类型的数据.

The names of these values represent a certain type of data.

现在，在我当前的模块实现中，我将所有这些符号链接放入数组中

Now in my current implementation of my module I put all these symbolic links into an array

static unsigned char TYPES[] = { NONE, SYM, SEG, ...}

并将数组中类型的位置添加为模块中的int常量.

And add the positions of the types in the array as int constants in the module.

PyMODINIT_FUNC initShell(void)
{
  PyObject *m;

  m=  Py_InitModule3("Sample", sample_Methods,"Sample Modules");
  if (m == NULL)
      return;
 ... 

  PyModule_AddIntConstant(m, "NONE", 0);
  PyModule_AddIntConstant(m, "SYM", 1);
  PyModule_AddIntConstant(m, "SEG", 2);
...
}

当调用函数时，我必须做类似的事情:

And when calling functions I have to do something like :

static PyObject *py_samplefunction(PyObject *self, PyObject *args, PyObject *kwargs) {

int type;
  if (!PyArg_ParseTuple(args,kwargs,"i",&type)
      return NULL;

 int retc;
 retc = sample_function(TYPES[type]);
 return Py_BuildValue("i", retc);
}

我对这种黑客不太满意，我认为它很容易出错，因此我基本上是在寻找一种解决方案，该解决方案无需使用数组，并且可以在函数调用中直接使用常量.有提示吗?

I'm not very happy with this hack and I think it is very prone to errors and so I'm basically looking for a solution which eliminates the array and allows for direct use of the constants in a function call. Any tips?

修改

使用PyModule_AddIntMacro(m, SEG);并如此调用示例函数即可解决该问题:

Using PyModule_AddIntMacro(m, SEG); and calling sample function as such, solves it:

static PyObject *py_samplefunction(PyObject *self, PyObject *args, PyObject *kwargs) {

int type;
  if (!PyArg_ParseTuple(args,kwargs,"i",&type)
      return NULL;

 int retc;
 retc = sample_function((unsigned char) type);
 return Py_BuildValue("i", retc);
}

推荐答案

为什么不只将常量添加到模块中?

Why not just add the constants to the module ?

PyModule_AddIntMacro(m, SYM);

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