共享Unicode与ANSI字串转换函数

[笨笨仔]

自行创建C++类，此处只列出.CPP内容，函数中有详细说明
Unicode转ANSI

// Unicod To ANSI转换
int CStringProc::UnicodToAnsi(CString str,char* buff)
{
	int len=0;
	// UNICODE编码 转换成 ANSI编码
	len = ::WideCharToMultiByte(CP_ACP, NULL, str, 
		str.GetLength(), NULL, 0, NULL, NULL);		// 取字串长度
	::WideCharToMultiByte(CP_ACP, NULL, str, str.GetLength(), 
		buff, len, NULL, NULL);
	buff[len++]=0x00;				// 写字串尾部结束标志

	return len;					// 转换长度
}

ANSI转Unicode

// ANSI To UNCODE转换
CString CStringProc::AnsiToUnicode(char * szAnsi, int len)
{
	CString str;
	// ansi to unicode
	//预转换，得到所需空间的大小
	int wcsLen;
	if(len>0)
		wcsLen=len;
	else
		wcsLen= ::MultiByteToWideChar(CP_ACP, NULL, szAnsi, strlen(szAnsi), NULL, 0);
	//分配空间要给'\0'留个空间，MultiByteToWideChar不会给'\0'空间
	wchar_t* wszString = new wchar_t[wcsLen + 1];
	//转换
	::MultiByteToWideChar(CP_ACP, NULL, szAnsi, strlen(szAnsi), wszString, wcsLen);
	//最后加上'\0'
	wszString[wcsLen] = '\0';			// UNICODE字串
	str=wszString;
	delete wszString;
	return str;
}

[Eleven]

如果当前工程不是Unicode编码，而是多字节编码呢？

[yyyyy_3]

好东西.

[LittleCommit]

提点建议：
1、delete wszString; 这行有内存泄露，用delete[] wszString;代替
2、int CStringProc::UnicodToAnsi(CString str,char* buff)这个函数中，要验证一下buff是否有效，且是否有足够内存空间!

[振翅高飞]

wchar_t * ANSIToUnicode( const char* str )
{
int textlen ;
wchar_t * result;
textlen = MultiByteToWideChar( CP_ACP, 0, str,-1, NULL,0 );
result = (wchar_t *)malloc((textlen+1)*sizeof(wchar_t));
memset(result,0,(textlen+1)*sizeof(wchar_t));
MultiByteToWideChar(CP_ACP, 0,str,-1,(LPWSTR)result,textlen );
return result;
}

char * UnicodeToANSI( const wchar_t* str )
{
char* result;
int textlen;
textlen = WideCharToMultiByte( CP_ACP, 0, str, -1, NULL, 0, NULL, NULL );
result =(char *)malloc((textlen+1)*sizeof(char));
memset( result, 0, sizeof(char) * ( textlen + 1 ) );
WideCharToMultiByte( CP_ACP, 0, str, -1, result, textlen, NULL, NULL );
return result;
}

wchar_t * UTF8ToUnicode( const char* str )
{
int textlen ;
wchar_t * result;
textlen = MultiByteToWideChar( CP_UTF8, 0, str,-1, NULL,0 );
result = (wchar_t *)malloc((textlen+1)*sizeof(wchar_t));
memset(result,0,(textlen+1)*sizeof(wchar_t));
MultiByteToWideChar(CP_UTF8, 0,str,-1,(LPWSTR)result,textlen );
return result;
}

char * UnicodeToUTF8( const wchar_t* str )
{
char* result;
int textlen;
textlen = WideCharToMultiByte( CP_UTF8, 0, str, -1, NULL, 0, NULL, NULL );
result =(char *)malloc((textlen+1)*sizeof(char));
memset(result, 0, sizeof(char) * ( textlen + 1 ) );
WideCharToMultiByte( CP_UTF8, 0, str, -1, result, textlen, NULL, NULL );
return result;
}
/*宽字符转换为多字符Unicode - ANSI*/
char* w2m(const wchar_t* wcs)
{
int len;
char* buf;
len =wcstombs(NULL,wcs,0);
if (len == 0)
return NULL;
buf = (char *)malloc(sizeof(char)*(len+1));
memset(buf, 0, sizeof(char) *(len+1));
len =wcstombs(buf,wcs,len+1);
return buf;
}
/*多字符转换为宽字符ANSI - Unicode*/
wchar_t* m2w(const char* mbs)
{
int len;
wchar_t* buf;
len =mbstowcs(NULL,mbs,0);
if (len == 0)
return NULL;
buf = (wchar_t *)malloc(sizeof(wchar_t)*(len+1));
memset(buf, 0, sizeof(wchar_t) *(len+1));
len =mbstowcs(buf,mbs,len+1);
return buf;
}

char* ANSIToUTF8(const char* str)
{
return UnicodeToUTF8(ANSIToUnicode(str));
}

char* UTF8ToANSI(const char* str)
{
return UnicodeToANSI(UTF8ToUnicode(str));
}


从网上找的，大家一起分享。

[笨笨仔]

[Quote=引用 2 楼 的回复:]
提点建议：
1、delete wszString; 这行有内存泄露，用delete[] wszString;代替
2、int CStringProc::UnicodToAnsi(CString str,char* buff)这个函数中，要验证一下buff是否有效，且是否有足够内存空间!
[/Quote]
谢谢！