Lua脚本调用C函数小结
2006-10-11 11:38
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Lua脚本调用C函数小结
仔细的学习了一下,发现功能的确非常强大。用脚本调用C的函数,都希望有如下特性:1. 多输出
Lua 本身就支持函数返回多个值,语法如下:
x,y = testext.Test()
2. 可以使用类似C的结构的形式输入输出
Lua 的Table可以在形式上很好的模仿C的结构,
a = {}
a.i = 101
a.name = "jason"
a.subtable = {}
a.subtable.i = 99
相当于
struct A
{
int i;
string name;
struct subtable
{
int i;
}
}
这个能力一般的脚本是不具备的。我们的应用中,很多参数都是用结构组织的,
以前使用TCL,就只能让用户平铺的输入。现在好多了.
输出也可以,在C的函数中可以返回一个table给Lua脚本。TCL也可以返回一个Array.
不过给Lua写C函数太痛苦了,全部是基于堆栈的,而且非常的不直观,看来还需要
研究一下如何封装。网上有不少基于模版的封装,得好好看看。
测试代码如下:
Lua
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
local testlib = package.loadlib("testext.dll","luaopen_testext")
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
if(testlib)then
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
testlib()
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
else
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
-- Error
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
end
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedBlock.gif)
a =
![](http://blog.vckbase.com/Images/dot.gif)
{}
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
a.i = 101
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
a.name = "jason hah"
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedBlock.gif)
a.subtable =
![](http://blog.vckbase.com/Images/dot.gif)
{}
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
a.subtable.i = 99
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
r = testext.Complex(a)
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
print(r.mydata)
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
C
![](http://blog.vckbase.com/Images/OutliningIndicators/None.gif)
static int Complex(lua_State* L)
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://blog.vckbase.com/Images/dot.gif)
{
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
//1. get the table from Lua Script
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
int i = lua_gettop(L);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
if( i != 1)
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://blog.vckbase.com/Images/dot.gif)
{
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_pushstring(L, "Complex(table)" ) ;
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
return 1;
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
if (lua_istable(L, 1))
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://blog.vckbase.com/Images/dot.gif)
{
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_pushstring(L,"i");
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_gettable(L,-2);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
if(lua_isnumber(L,-1))
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://blog.vckbase.com/Images/dot.gif)
{
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
int j = lua_tonumber(L, -1);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
printf("The table.j = %d ",j);
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_remove(L,-1);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_pushstring(L,"name");
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_gettable(L,-2);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
if(lua_isstring(L,-1))
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://blog.vckbase.com/Images/dot.gif)
{
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
char* name = lua_tostring(L, -1);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
printf("The table.name = %s ",name);
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_remove(L,-1);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_pushstring(L,"subtable");
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_gettable(L,-2);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
if(lua_istable(L,-1))
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://blog.vckbase.com/Images/dot.gif)
{
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_pushstring(L,"i");
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_gettable(L,-2);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
if(lua_isnumber(L,-1))
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://blog.vckbase.com/Images/dot.gif)
{
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
int j = lua_tonumber(L, -1);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
printf("The table.j = %d ",j);
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
else
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://blog.vckbase.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://blog.vckbase.com/Images/dot.gif)
{
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_pushstring(L, "Complex(table)" ) ;
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
return 1;
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
//2. Return Another table to Lua Script
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_newtable(L);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_pushstring(L, "mydata");
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_pushnumber(L,66);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
lua_settable(L,-3);
![](http://blog.vckbase.com/Images/OutliningIndicators/InBlock.gif)
return 1;
![](http://blog.vckbase.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
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