跨平台GBK与UTF8互转代码,C代码库,德仔网

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【C】跨平台GBK与UTF8互转
作者:xiaot99 / 发布于2014/7/17/ 922

	class string_util
	{
	public:
	
	#ifndef _UNIX
	 //我的程序只需要支持GBK,各位可以在这里加上Linux下的编码名字与windows下的codepage的
	
	对应关系进行扩展。
	 static inline int codepage(const char* code_page)
	 {
	 return 936;//"GBK"
	 }
	#endif
	
	 static inline int dbcs2wchar(const char* code_page,/*in*/const char* in,int
	
	in_len,
	 /*out*/wchar_t* out,int out_max)
	 {
	#ifdef _UNIX
	 size_t result;
	 iconv_t env;
	 env = iconv_open("WCHAR_T",code_page);
	 result = iconv(env,(char**)&in,(size_t*)&in_len,(char**)&out,(size_t*)
	
	&out_max);
	 iconv_close(env);
	 return (int) result;
	#else
	 return ::MultiByteToWideChar(codepage(code_page),0,in,in_len,out,out_max);
	#endif
	 }
	
	 static inline int dbcs2wchar(const char* code_page,/*in*/const string&
	
	in,/*out*/wstring& out)
	 {
	 int len = in.length() + 1;
	 int result;
	 wchar_t* pBuffer = new wchar_t[len];
	 memset(pBuffer,0,len*sizeof(wchar_t));
	 result = dbcs2wchar(code_page,in.c_str(),in.length(),pBuffer,len*sizeof
	
	(wchar_t));
	 if(pBuffer >= 0)
	 {
	 out = pBuffer;
	 }
	 else
	 {
	 out.clear();
	 }
	 delete[] pBuffer;
	 return result;
	 }
	
	 static inline int wchar2dbcs(const char* code_page,/*in*/const wchar_t* in,int
	
	in_len,
	 /*out*/char* out,int out_max)
	 {
	#ifdef _UNIX
	 size_t result;
	 iconv_t env;
	 env = iconv_open(code_page,"WCHAR_T");
	 result = iconv(env,(char**)&in,(size_t*)&in_len,(char**)&out,(size_t*)
	
	&out_max);
	 iconv_close(env);
	 return (int) result;
	#else
	 BOOL use_def_char;
	 use_def_char = FALSE;
	 return ::WideCharToMultiByte(codepage(code_page),0,in,in_len/sizeof
	
	(wchar_t),out,out_max,"?",&use_def_char);
	#endif
	 }
	
	 static inline int wchar2dbcs(const char* code_page,/*in*/const wstring&
	
	in,/*out*/string& out)
	 {
	 int len = in.length() + 1;
	 int result;
	 char* pBuffer = new char[len*3];
	 memset(pBuffer,0,len*3);
	 result = wchar2dbcs(code_page,in.c_str(),in.length() * sizeof
	
	(wchar_t),pBuffer,len*3);
	 if(result >= 0)
	 {
	 out = pBuffer;
	 }
	 else
	 {
	 out = "";
	 }
	 delete[] pBuffer;
	 return result;
	 }
	
	 static inline int wchar2utf8(/*in*/const wchar_t* in,int in_len,
	 /*out*/char* out,int out_max)
	 {
	#ifdef _UNIX
	 size_t result;
	 iconv_t env;
	
	 env = iconv_open("UTF8","WCHAR_T");
	 result = iconv(env,(char**)&in,(size_t*)&in_len,(char**)&out,(size_t*)
	
	&out_max);
	 iconv_close(env);
	 return (int) result;
	#else
	 BOOL use_def_char;
	 use_def_char = FALSE;
	 return ::WideCharToMultiByte(CP_UTF8,0,in,in_len/sizeof
	
	(wchar_t),out,out_max,NULL,NULL);
	#endif
	 }
	
	 static inline int wchar2utf8(/*in*/const wstring& in,/*out*/string& out)
	 {
	 int len = in.length() + 1;
	 int result;
	 char* pBuffer = new char[len*3];
	 memset(pBuffer,0,len*3);
	
	
	 result = wchar2utf8(in.c_str(),in.length() * sizeof(wchar_t),pBuffer,len*3);
	
	
	 if(result >= 0)
	 {
	 out = pBuffer;
	 }
	 else
	 {
	 out = "";
	 }
	 delete[] pBuffer;
	 return result;
	 }
	
	 static inline int utf82wchar(/*in*/const char* in,int in_len,
	 /*out*/wchar_t* out,int out_max)
	 {
	#ifdef _UNIX
	 size_t result;
	 iconv_t env;
	 env = iconv_open("WCHAR_T","UTF8");
	 result = iconv(env,(char**)&in,(size_t*)&in_len,(char**)&out,(size_t*)
	
	&out_max);
	 iconv_close(env);
	 return (int) result;
	#else
	 return ::MultiByteToWideChar(CP_UTF8,0,in,in_len,out,out_max);
	#endif
	 }
	
	 static inline int utf82wchar(/*in*/const string& in,/*out*/wstring& out)
	 {
	 int len = in.length() + 1;
	 int result;
	 //wstring temp;
	 wchar_t* pBuffer = new wchar_t[len];
	 memset(pBuffer,0,len*sizeof(wchar_t));
	 result = utf82wchar(in.c_str(),in.length(),pBuffer,len*sizeof(wchar_t));
	 //printf("utf82wchar result is %d,errno is %s\n",result,strerror(errno));
	 if(result >= 0)
	 {
	 out = pBuffer;
	 }
	 else
	 {
	 out.clear();
	 }
	 delete[] pBuffer;
	 return result;
	 }
	};
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　GBK与UTF8　
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