將iconv編譯成lua介面，iconv編譯lua

將iconv編譯成lua介面，iconv編譯lua

前一篇博文說了，在cocos2dx中怎麼樣使用iconv轉碼，這節我們將上一節中寫的轉碼函數，做成一個lua介面，在lua指令碼中使用。

網上可以下載到luaconv，但是編譯的時候總是報錯，所以自己寫了一介面。

一 添加lua介面檔案

// luaiconv.h

#ifndef __LUA_ICONV_H__#define __LUA_ICONV_H__#include "tolua++.h"#include "tolua_event.h"#include "lauxlib.h"#if CC_TARGET_PLATFORM == CC_PLATFORM_WIN32#include "iconv.h"#elif CC_TARGET_PLATFORM == CC_PLATFORM_IOS#include <iconv.h>#elif CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID#include "iconv.h"#endifint tolua_iconv_open(lua_State *L);#endif

//luaiconv.cpp

#include "luaiconv.h"#include <stdlib.h>#define MAX_STRING_SIZE 1024#define TEST_STR ("Hello, 這是個轉碼測試字串")bool iconv_convert(void *src, unsigned int src_len,char *src_charset, void *dest, unsigned int dest_len, char *dest_charset){const char *in;char *out,*dest_ptr;size_t in_left,out_left,mutant,converted;in_left = src_len;out_left = dest_len;in = (char *)src;out = dest_ptr = (char *)dest;iconv_t oConv=iconv_open(dest_charset,src_charset);if(oConv==(iconv_t)(-1)){printf("XXXXXXXXXX ERROR: unable to open libiconv.\n");return false;}mutant = iconv(oConv, &in, &in_left, &out, &out_left );iconv_close(oConv);if(mutant == (size_t)(-1)){printf("XXXXXXXXXX ERROR: unable to convert anything.\n");return false;}converted = dest_len - out_left;dest_ptr[converted]='\0';printf("XXXXXXXXXX src string:%s\n", src);printf("XXXXXXXXXX to convert %u characters, %u mutanted , %u converted \n",src_len,mutant,converted);printf("XXXXXXXXXX dst string:%s\n", dest);return true;}void convertTest(){char inStr[] = TEST_STR;char outStr[MAX_STRING_SIZE];iconv_convert(&inStr, sizeof(inStr), "GBK", &outStr, sizeof(outStr), "UTF-8");printf("XXXXXXXXXX in string:%s\n", inStr);printf("XXXXXXXXXX out string:%s\n", outStr);}TOLUA_API int luaiconv(lua_State *L){char *inbuf = (char*) luaL_checkstring(L, 1);char *src_charset = (char*) luaL_checkstring(L, 2);char *dst_charset = (char*) luaL_checkstring(L, 3);size_t ibleft = lua_strlen(L, 1);size_t obleft = (ibleft > 256) ? ibleft : 256; char *outbuf = (char*) malloc(obleft * sizeof(char));    if (outbuf == NULL) {        lua_pushstring(L, "");        return 1;    }if(!iconv_convert(inbuf, ibleft, src_charset, outbuf, obleft, dst_charset)){lua_pushstring(L, "");return 1;}    lua_pushstring(L, outbuf);    free(outbuf);    return 1;}static luaL_Reg iconvlib[] = {{"luaiconv", luaiconv},{NULL, NULL}};// 函數名必須為luaopen_xxx，其中xxx表示library名稱,Lua代碼require "xxx"需要與之對應。int luaopen_iconv(lua_State* L){const char* libName = "iconv";luaL_register(L, libName, iconvlib);// 調用方式libName.函數名return 1;}int tolua_iconv_open(lua_State *L){luaopen_iconv(L);return 1;}

在AppDelegate中

#include "luaiconv.h"

然後在AppDelegate::applicationDidFinishLaunching()中調用：

CCLuaEngine* pEngine = CCLuaEngine::defaultEngine();CCScriptEngineManager::sharedManager()->setScriptEngine(pEngine);tolua_iconv_open(pEngine->getLuaStack()->getLuaState());

在lua中這樣使用：

require "iconv"iconv.luaiconv("string to convert code","GBK","UTF-8")

二 修改項目的Android.mkLOCAL_SRC_FILES 中加上luaiconv.cpp 

切記在末尾加上空格和續行符:" \"

否則有可能會報錯：

make: *** No rule to make target 'xxx.o', needed by 'xxx'. Stop