头文件与库文件，头文件桥梁作用如何体现

[zhi_oo]

我们在自己编写一个动态库的时候，并未提供头文件让其调用者包含，只是在编译时指定库文件路径及库文件名称。
为什么调用系统这种正规接口时，必须要包含头文件找到接口，再指定库名（路径默认），然后才可以调用呢？

头文件的桥梁作用究竟是如何体现的？

[小笨和漂向北方]

shared library will not get involved into compiling process, it is only referred during linking process. I wonder how you could successfully compile your codes with reference to the type/function inside the shared library without including library's header file? Compiler doesn't care the implementation of these types/functions, but it does care about the declaration of them...