ç下旬未知参数绑定 [英] C late binding with unknown arguments

问题描述

我psently $ P $在我需要调用大量已在运行时被提取函数指针的情况。问题是，参数是在编译时未知。

I am presently in a case where I need to call a lot of function pointers that has been extracted at runtime. The problem is that the arguments are unknown at compilation time.

但是，在运行时我收到DATAS，让我知道该函数的参数，我甚至可以在参数存储在一个char *数组。问题是，我没有一个函数指针模型来扔。

But, at runtime I receive datas that allows me to know the arguments of the function and I can even store the arguments in a char* array. The problem is that I don't have a function pointer model to cast it into.

在高级语言，我知道有类似功能InvokeMethode（字符串名称，字节[]参数），国米preT字节数组类似的论点。由于反射不存在C，我已经没有希望看到与这个函数指针。

In high level language, I know there is function like "InvokeMethode(String name,Byte[] args)" that interpret the bytes array like arguments. Since reflection does not exist in C, I have no hope to see this with a function pointer.

一个解决方案，我有一点（和它的非常糟糕），是建立在编译时函数指针的模式，将在硬codeD方式剧组在PTR为正确的类型使用像这样的：

One solution that I have in mind (and it's really bad), is to create a model of function pointer at compilation time that will cast in a "hardcoded way" the ptr to the right type to use like this:

void callFunc64Bits(void* funcPtr,long long args);
void callFuncVoid(void* funcPtr);

问题是，我将不得不创建一个类似100的功能像这样将正确地转换指针。

The problem is that I will have to create like 100 function like this that will cast the pointer correctly.

有没有办法更有效地做到这一点？

Is there a way to do it more efficiently?

非常感谢你！

推荐答案

这是一个困难的问题没有了，遗憾的是，好简单的答案。

This is a hard problem without, unfortunately, good or easy answers.

请参阅此前者SO问题：<一href=\"http://stackoverflow.com/questions/22169879/run-time-parameters-in-gcc-inverse-va-args-varargs\">Run-time在gcc的参数（反va_args /可变参数）

See this former SO question: Run-time parameters in gcc (inverse va_args/varargs)

请参阅该C FAQ问题： http://c-faq.com/varargs/invvarargs。 HTML

See this C FAQ question: http://c-faq.com/varargs/invvarargs.html

由C常见问题列表维护见本集的古怪的想法// C -faq.com/varargs/wacky.html

See this collection of "wacky ideas" by the C FAQ list maintainer: http://c-faq.com/varargs/wacky.html

附录：看到这个前SO问题：<一href=\"http://stackoverflow.com/questions/12206865/how-to-call-functions-by-their-pointers-passing-multiple-arguments-in-c\">How其指针传递多个参数在C中调用函数？

Addendum: see this former SO question: How to call functions by their pointers passing multiple arguments in C?

...其中提到libffi： http://sourceware.org/libffi/

...which mentions "libffi": http://sourceware.org/libffi/

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