这是可以自定义的printf？ [英] Is this possible to customize printf?

问题描述

我有一些结构，我需要经常打印。现在，我使用的是传统的印刷包装解决此结构：

I have some struct that I need to print frequently. For now, I am using a classical print wrapper around this struct :

void printf_mystruct(struct* my_struct)
{
   if (my_struct==NULL) return;
   printf("[value1:%d value2:%d]", struct->value1, struct->value2);
}

此功能是方便，但也实在有限。我不能prepen或追加一些文本而不进行新的包装。我知道我可以使用在va_arg 家庭能够prePEND或AP preND一些文字，但我觉得我会被重新实现轮。

This function is handy, but is also really limited. I cannot prepen or append some text without making a new wrapper. I know that I can use va_arg family to be able to prepend or apprend some text, but I feel like I would be re-implementing the wheel.

我想知道是否有可能写一个定制功能的printf。我希望能够写这样的事：

I am wondering if it's possible to write a customizing function to printf. I would like to be able to write something like this :

register2printf("%mys", &printf_mystruct); 
...
if (incorrect)
  printf("[%l] Struct is incorrect : %mys\n", log_level, my_struct);

这可能吗？我怎样才能做到这一点？

Is this possible ? How can I do this ?

注：我在Ubuntu Linux操作系统和10.04我用gcc

NB: I am under Ubuntu Linux 10.04 and I use gcc.

推荐答案

^{很抱歉，但一些答案不正确，在Linux上用glibc}

在Linux上使用GNU的glibc，可以定制的printf ：您会打电话
register_printf_function 来如在你的的printf 格式字符串定义％Y 的含义。

On Linux with a GNU Glibc, you can customize printf: you would call register_printf_function to e.g. define the meaning of %Y in your printf format strings.

但是，这种行为是具体的Glibc，甚至可能会过时...我不知道我会推荐这种方法！

However, this behavior is Glibc specific, and might even become obsolete... I'm not sure I would recommend this approach!

如果用C编码++中，C ++流库有哪些可以扩展操纵，你也可以超载为你的类型的运营商的LT;＆LT; 等

If coding in C++, the C++ stream library has manipulators which you could extend, and you can also overload for your types the operator << etc.

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