# aardio 范例: 调用 C 语言 - 结构化参数表



```aardio
//aardio 调用 C 语言 - 结构化参数表

import tcc; 
var c = tcc();
c.enableIoPrintf();

c.code = /****
	#include <stdio.h>
	#include <stdlib.h> 
 	
	//在C语言中定义 raw.cdeclParameter,注意 aardio 字符串默认为 UTF8 编码
	typedef struct{ 
		const char *(__cdecl *getType) (const char * name);
		void * (__cdecl *getFunction) (const char * name,const char *proto);
		void (__cdecl *setFunction) (const char * name,const char *proto,void * addr); 
		const char *(__cdecl *getBinary) (const char * name,unsigned int *size);
		void (__cdecl *setBinary) (const char * name,char * value,unsigned int size);
		const char *(__cdecl *getString) (const char * name);
		void (__cdecl *setString) (const char * name,const char * value);
		void (__cdecl *getNumber) (const char * name,double * value);
		void (__cdecl *setNumber) (const char * name,double value);
		unsigned long long (__cdecl *getSize64) (const char * name);
		void (__cdecl *setSize64) (const char * name,unsigned long long value);
		void * (__cdecl *getPointer) (const char * name);
		void (__cdecl *setPointer) (const char * name,void * value);
		int (__cdecl *callString) (const char * name,const char * arg);
		int (__cdecl *callNumber) (const char * name,double arg);
		int (__cdecl *call) (const char * name);
		unsigned int(__cdecl *len)(const char * name);
	} aardioParameter;

	typedef double (*ADDFUNC) (double a,double b);
	
	int func_c ( aardioParameter * opt )
	{   
	  
 	 	//取参数中的字段值,字段名可以使用命名空间,例如  x.y.z.字段名
 	 	const char * s = opt->getString("hello");  
   		io_printf( "Hello! 我是C语言代码\n收到aardio传来的参数:%s\n", s ); 
   		
   		//调用参数中包含的函数名
		opt->callString("func","参数");
		
		//可以添加C函数为 aardio 函数
 		opt->setFunction("test.printf","void(string s,int x,int y)",printf);
		 
		//也以声明aardio中的函数为C函数
		int (*add) (int a,int b) =  opt->getFunction("test.add","int(int,int)" );
 		int c = (*add)(12,3);
 		
 		unsigned long long  x =  opt->getSize64("size" );
 		io_printf( " LONG64: %I64u\n", x); 
		return 0; 
	} 

****/
 


//创建结构化参数
import console;
import raw.cdeclParameter;
var cdeclParameter = raw.cdeclParameter(
	size = ..math.size64(2,1);
	hello = "测试!";
	func = function(参数){
		..console.log("aardio函数被回调了",参数 ) 
	} 
	test = {
		add  = function(a,b){
			owner.printf( '在aardio中调用C语言声明的函数 %d %d\n',12,33 ); 
			return a+b
		} 
	}
) 

//获取C函数
func_c = c.getCdecl("func_c","int(struct msg)")

//调用C函数
func_c( cdeclParameter )
 
//关闭C语言编译器
c.close();

console.pause();
```