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U_STABLE UChar* U_EXPORT2 u_strFromWCS ( UChar *  dest,
int32_t  destCapacity,
int32_t *  pDestLength,
const wchar_t *  src,
int32_t  srcLength,
UErrorCode pErrorCode 

Convert a wchar_t string to UTF-16. If it is known at compile time that wchar_t strings are in UTF-16 or UTF-32, then this function simply calls the fast, dedicated function for that. Otherwise, two conversions wchar_t* -> default charset -> UTF-16 are performed.

dest A buffer for the result string. The result will be zero-terminated if the buffer is large enough.
destCapacity The size of the buffer (number of UChars). If it is 0, then dest may be NULL and the function will only return the length of the result without writing any of the result string (pre-flighting).
pDestLength A pointer to receive the number of units written to the destination. If pDestLength!=NULL then *pDestLength is always set to the number of output units corresponding to the transformation of all the input units, even in case of a buffer overflow.
src The original source string
srcLength The length of the original string. If -1, then src must be zero-terminated.
pErrorCode Must be a valid pointer to an error code value, which must not indicate a failure before the function call.
The pointer to destination buffer. ICU 2.0

Definition at line 477 of file ustr_wcs.c.



    /* args check */
    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)){
        return NULL;

    if( (src==NULL && srcLength!=0) || srcLength < -1 ||
        (destCapacity<0) || (dest == NULL && destCapacity > 0)
    ) {
        *pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
        return NULL;

#ifdef U_WCHAR_IS_UTF16
    /* wchar_t is UTF-16 just do a memcpy */
    if(srcLength == -1){
        srcLength = u_strlen(src);
    if(0 < srcLength && srcLength <= destCapacity){
       *pDestLength = srcLength;


    return dest;

#elif defined U_WCHAR_IS_UTF32
    return u_strFromUTF32(dest, destCapacity, pDestLength,
                          (UChar32*)src, srcLength, pErrorCode);


    return _strFromWCS(dest,destCapacity,pDestLength,src,srcLength,pErrorCode);  



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