是否有可能调用C函数,它的名字作为一个字符串? [英] Is it possible to call a C function, given its name as a string?
问题描述
我看到这个问题在C难题之一!
这真的可能吗?
I saw this question in one of the C puzzles!! Is this really possible?
我怎么能调用一个函数,因为它的名字作为一个字符串?
是有可能使用所读取与scanf的可直接使用的字符串调用
功能?
How can I call a function, given its name as a string? is it possible to use string that is read with scanf be used directly to call a function?
我已经想到了,如果(STRCMP(STR字符串)),然后调用该函数。
i already have thought of if(strcmp(str,"string"))then call the function.
但没有任何其他的方法呢?
but is there any other approach?
推荐答案
由于没有提到什么是功能,也不是它的参数,我会想象它是这样的:
Since no mention of what is a function, nor its parameters, I would imagine it something like this:
typedef void (*foo)();
struct puzzleFoo{
char *function_name;
foo *fn;
};
创建基于结构的查找表,使用字符串参数
Create a lookup table based on the structure, using a string parameter
struct puzzleFoo *Lookup(const char *function_name);
然后通过阵列/列表寻找 puzzleFoo
的 function_nam
e时迭代,并执行函数指针叫 FN
。
Then iterate through an array/list looking for the puzzleFoo
's function_nam
e and execute the function pointer called fn
.
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