c/c++开发分享脚本引擎–调用“未知”function

我想创建脚本引擎，我发现了奇怪的问题。 首先我解释一下它将如何工作：脚本引擎（DLL）将独立于将要使用的应用程序。 SE将导出两个函数（有些类似，它可能有点不同）：

// This will be called on beginning of host program, register set of functions, that // script will provide to usere SetFunc(void *func,byte code,char *descript); func : pointer to existing function from host application (eg printf) code : code for script compiler descript : func description, if eventually needed // function calling functions inc Script Engine (in compiled DLL, which can't be // modified for host application, only input for SE is SetFunc CallFunc(void *instr); instr : pointer to memory block, in which is stored (instr_code - byte)(void* - pointer to func)(params_len - unsigned int)(params - data block) /--- this will be filled after loading script to SE, according to table of registred functions (via Setfunc). Callfunc(void *func,void *params,unsigned int param_length); func : pointer to function params : parameters for function in memory block (extracted from instr) param_length : what to say :o) 

主程序示例：

 #include "ScriptEngine.h" // this will create connection to SE DLL float add(double num1,double num2) { return (num1+num2); } int main() { SetFunc(add,1,"f:d,d/2"); // register one function to SE LoadScript("simple.sc","simple"); // load script to memory ExecuteScript("simple"); // execute script (only add two nums) } 

和脚本：

 main() { add(3.45,8.87); } // after some compilation to binary format : ... (1)(NULL)(16)(3.45)(8.87) (instruction for "system call" (registred via SetFunc) ... // after LoadScript (1)(0x00402cc)(16)(3.45)(8.87) 

并且在ExecuteScript上调用内部DLL函数CallFunc，并从instr输入设置参数。

如何从指针调用函数并在此环境中设置参数？ 我可以通过这种方式创建这个，或者有人有另外的想法，如何做到这一点？

感谢所有答案：o）

 // Common type for all native functions. typedef void(*NativeFuncPtr)(VM*); // The Virtual Machine is wrapped in a `VM` object. // popDouble() and pushDouble() make use of the more primitive // stack operations push() and pop(). void add(Vm* vm) { double a = vm->popDouble(); double b = vm->popDouble(); vm->pushDouble(a + b); // leave the result on the VM stack. } // The call to setFunc will map the string "add" to the address of the // `add()` function in a hashtable. vm->setFunc("add", &add); 

 pushDouble 8.87 pushDouble 3.45 call add 

 NativeFuncPtr fptr = nativeFunctions["add"]; (*fptr)(this); 

以上就是c/c++开发分享脚本引擎 – 调用“未知”function相关内容,想了解更多C/C++开发(异常处理)及C/C++游戏开发关注(编程笔记)。