CODEWITHSUNDEEP
c++utf-8charcstringunicode-string
Greenhorn
Greenhorn

Reputation: 668

Conversion of UTF-8 char * to CString

How do I convert a string in UTF-8 char* to CString?

Upvotes: 4

Views: 15508

Answers (3)

Serge Dundich
Serge Dundich

Reputation: 4439

bool Utf8ToCString( CString& cstr, const char* utf8Str )
{
    size_t utf8StrLen = strlen(utf8Str);

    if( utf8StrLen == 0 )
    {
        cstr.Empty();
        return true;
    }

    LPTSTR* ptr = cstr.GetBuffer(utf8StrLen+1);

#ifdef UNICODE
    // CString is UNICODE string so we decode
    int newLen = MultiByteToWideChar(
                     CP_UTF8,  0,
                     utf8Str, utf8StrLen,  ptr, utf8StrLen+1
                     );
    if( !newLen )
    {
        cstr.ReleaseBuffer(0);
        return false;
    }
#else
    WCHAR* buf = (WCHAR*)malloc(utf8StrLen);

    if( buf == NULL )
    {
        cstr.ReleaseBuffer(0);
        return false;
    }

    int newLen = MultiByteToWideChar(
                     CP_UTF8,  0,
                     utf8Str, utf8StrLen,  buf, utf8StrLen
                     );
    if( !newLen )
    {
        free(buf);
        cstr.ReleaseBuffer(0);
        return false;
    }

    assert( newLen < utf8StrLen );
    newLen = WideCharToMultiByte(
                     CP_ACP,  0,
                     buf, newLen,  ptr, utf8StrLen
                     );
    if( !newLen )
    {
        free(buf);
        cstr.ReleaseBuffer(0);
        return false;
    }

    free(buf);
#endif

    cstr.ReleaseBuffer(newLen);
    return true;
}

Though this function is valid for both UNICODE and non-UNICODE configurations IMHO using UNICODE configuration in Win32 programs is much more productive (in general and in this function).

Upvotes: 5

Jurlie
Jurlie

Reputation: 1014

If your string contains only ASCII-characters with codes 0 to 127 you may threat your UTF-8 string as ASCII string and initialise CString with it:

CString my_cstr((char*)my_string);

Otherwise (if your UTF-8 string contains some other characters) you have no easy way to get char* string from it.

Upvotes: 0

ildjarn
ildjarn

Reputation: 62975

Call MultiByteToWideChar with a code page of CP_UTF8, then use CString as normal.

Upvotes: 4

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