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@sarabande, &nbsp;Thank you for your excellent solution.<br />
<br />
How should I marshal an array of unmanaged C++ <br />
<br />
struct CC_STR32 <br />
{ <br />
&nbsp; &nbsp; wchar_t szString[32] ;<br />
} <br />
<br />
to an managed C# array of IntPtr's on Ubuntu Linux 15.10 and Mono version 4.2.1?
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i don't know much about c# on linux. at Windows IntPtr is defined for native c++ and c# and has the same size. you may use it for a native pointer - void* - which is guaranteed to fit into IntPtr. for win32 platform IntPtr is 32-bit and size 4. instead of pointers you could marshal 32-bit integers or even smaller integers like wchar_t.<br />
<br />
if you are lucky, the same applies for your platform. find out, whether the gcc has type IntPtr or intptr_t and whether it is 32 bit or 64 bit. also find out which size wchar_t is. do the same for c# on Linux.<br />
<br />
if sizes match you may provide a pointer to an array of IntPtr from c++ and have the same at the c#. if wchar_t type is 16-bit on both you have the alternative to use an array of IntPtr's as 'transport' unit - or - transfer it as BYTE array (pointer to unsigned char) instead. most likely you have a 3rd alternative where there is a marshalling function for wchar_t.<br />
<br />
if wchar_t is 32-bit (and utf-32) on gcc you could use a pointer to that buffer if IntPtr at c# is also 32 bit. then at c# you have to build the string from IntPtr array (or using the right marshalling function).<br />
<br />
actually, there are a lot of possibilities but the solution finally will end into something like the while loop i posted in the previous comment respectively into a function call which takes an IntPtr array and returns a string.<br />
<br />
Sara
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@Sarabande's solution is excellent and very useful as always.
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<div class="content wysiwyg-content">
I read this link, stackoverflow.com/question<wbr />s/23919515<wbr />/how-to-co<wbr />nvert-from<wbr />-utf-16-to<wbr />-utf-32-on<wbr />-linux-wit<wbr />h-std-libr<wbr />ary, <br />
on how to convert utf16 to utf32 using C++ on Ubuntu Linux 15.10 with the gcc c++11 compiler.<br />
&nbsp; &nbsp;I would like to find out how to convert utf32 to utf16 using C++ on Ubuntu Linc 15.10 with the gcc c++11 compiler.<br />
&nbsp; &nbsp;This is not a homework assignment question.<br />
&nbsp; &nbsp; Thank you.
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I read this link, stackoverflow.com/questions/23919515/how-to-convert-from-utf-16-to-utf-32-on-linux-with-std-library, 
on how to convert utf16 to utf32 using C++ on Ubuntu Linux 15.10 with the gcc c++11 compiler.
   I would like to find out how to convert utf32 to utf16 using C++ on Ubuntu Linc 15.10 with the gcc c++11 compiler.
   This is not a homework assignment question.
    Thank you.

How to convert utf32 to utf16 using C++ on Ubuntu Linux 15.10 with the gcc c++11 compiler.

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.