C语言下Unicode字符串与多字节字符串转换方法

1.Unicode字符串转换为多字节字符串：

size_t wlen = 0;

wchar_t *wstr = (wchar_t*)pSrc;
//source unicode string

size_t byteLen =0;
//unicode string length in byte

size_t coverted = 0;

char retBuf[MODEL_CODEC_MAX_VALUE_LEN];

ST_RET ret = SD_FAILURE;

setlocale(LC_ALL,"chs");//setlocale(LC_ALL,"chs")会改变整个应用程序的字符集编码方式,调用完之后使用
//setlocale(LC_ALL,"C")还原。

wlen = wcslen(wstr);

byteLen = wlen * 2 + 1;

memset(retBuf,0,MODEL_CODEC_MAX_VALUE_LEN);

if(0 != wcstombs_s(&coverted,retBuf,MODEL_CODEC_MAX_VALUE_LEN,wstr,_TRUNCATE))

{

ret = SD_FAILURE;

}

else

{

ret = SD_SUCCESS;

}

setlocale(LC_ALL,"C");

assert(strlen(retBuf) < MODEL_CODEC_MAX_VALUE_LEN);

if(ret == SD_SUCCESS)

{

if(0 != strncpy_s(text,MODEL_CODEC_MAX_VALUE_LEN,retBuf,MODEL_CODEC_MAX_VALUE_LEN))

{

ret = SD_FAILURE;

}

}

return ret;

2.多字节字符串转换为Unicode字符串

setlocale(LC_ALL,"chs");

size_t len = strlen(text);

size_t converted = 0;

const int retLen = 512/sizeof(wchar_t);

wchar_t *retBuf = new wchar_t[retLen];

memset(retBuf,0,retLen);

bool ret = false;

if (0 != mbstowcs_s(&converted,retBuf,retLen,str,_TRUNCATE))

{

ret = false;

}

else

{

ret = true;

}

setlocale(LC_ALL,"C");

if (ret == true)

{

if (0 != wcsncpy_s(wstr,wcslen(retBuf)+1,retBuf,wcslen(retBuf)))

{

ret = false;

}

}

delete [] retBuf;

retBuf = 0;

return ret;