Is it possible to convert UTF32 text to UTF16 using only Windows API ?

Question

I'm trying to find converting UTF-32 text to/from any code page is possible using the Windows API alone. I cannot used CLR to do this task.

The Code page identifiers page at Microsoft at http://msdn.microsoft.com/en-us/library/dd317756(VS.85).aspx lists UTF-32 as being available to only managed applicatiosn.

ConvertStringTo/FromUnicode fails when UTF-32 is used.

Answer 1

With a bit of knowledge of Unicode you should be able to create a UTF32 to UTF16 converter without using any APIs.

All characters in the range U+0000 to U+FFFF can simply have the upper 16 bits removed.

Values in the range U+10000 to U+10FFFF can be converted into two 16-bit words, called surrogate pairs:

http://en.wikipedia.org/wiki/UTF-16#Encoding_of_characters_outside_the_BMP

Answer 2

You can use the iconv library in Windows. It fully supports UTF-32 (big and little endian).