wcstombs_s fails when input string is "€" (ASCII 128d) in C++\CLI

Question

Here is the method to convert from managed string to native char pointer, it'll return error code 42 when the input string is "€" (ASCII 128d):

void StringUtility::ManagedToNative(String^ source, char* pTarget, Int32 targetLength) { if(pTarget == NULL) throw gcnew System::ArgumentNullException("The source pointer cannot be empty."); if(targetLength <= 0) throw gcnew System::ArgumentOutOfRangeException("The target length has to be larger than 0."); memset(pTarget, 0, targetLength); if(String::IsNullOrEmpty(source)) { pTarget[0] = '\0'; return; } // Conversion to char* : size_t convertedChars = 0; size_t sizeInBytes = targetLength; size_t count = (source->Length > targetLength) ? _TRUNCATE : targetLength; errno_t err = 0; { /* minimize the scope of pined object */ pin_ptr<const wchar_t> wch = PtrToStringChars(source); err = wcstombs_s(&convertedChars, pTarget, sizeInBytes, wch, count); } // if truncate did happen and it's intended, return as successful. if( count == _TRUNCATE && err == STRUNCATE ) return; if (err != 0) throw gcnew System::InvalidOperationException("convert from String^ to char* failed"); }

Is it just because I can't convert any string (with bytes >= 128) using wcstombs_s? (see this)

You're in managed code. Why are you using wcstombs_s rather than System::Text::Encoding? — Medinoc
– Medinoc, Commented Dec 24, 2014 at 13:07
Then do exactly that, or use Encoding's pointer-based methods: msdn.microsoft.com/en-us/library/6s1x2atd%28v=vs.80%29.aspx — Medinoc
– Medinoc, Commented Dec 24, 2014 at 20:13

AZ. · Accepted Answer · 2012-06-06 18:44:07Z

From MSDN doc about wcstombs_s:

If wcstombs_s encounters a wide character it cannot convert to a multibyte character, it puts 0 in *pReturnValue, sets the destination buffer to an empty string, sets errno to EILSEQ, and returns EILSEQ.

EILSEQ is error code 42.

To convert Unicode string to char* array, I'd suggest get the binary array of the Unicode string and encode it using Base64 and store the encoded result in a char* array.

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