On Tuesday, 5 April 2016 at 01:21:55 UTC, Thalamus wrote:
I'm sorry for this total newbie question, but for some reason
this is eluding me. I must be overlooking something obvious,
but I haven't been able to figure this out and haven't found
anything helpful.
I am invoking an entry point in a D DLL from C# (via extern
(C)), and one of the parameters is a string. This works just
fine for ANSI, but I'm having trouble with the Unicode
equivalent.
For ANSI, the message parameter is char*, and string info =
to!string(message) produces the correct string.
For Unicode, I assumed this would be wchar_t*, as it is in C++.
(In C++ you can just pass the wchar_t* value to the wstring
constructor.) So I tried wchar_t*, wchar* and dchar* as well.
When the message parameter is wchar*, wstring info =
to!wstring(message) populates the string with the _address_ of
the wchar*. So when message was in the debugger as
0x00000000035370e8 L"Writing Exhaustive unit tests is
exhausting.", the wstring info variable ended up as {length=7
ptr=0x000000001c174a20 L"35370E8" }. The dstring*/wchar_t*
version had equivalent results.
Again, I'm sure I'm missing something obvious, but I poked at
this problem with various types, casts, Phobos library string
conversions, and I'm just stumped! :)
thanks,
Thalamus
I cannot give you any code example, but can you try that:
1. By using a loop, calculate the total byte length until finding
0 (zero). (This would work only if it was given as
NULL-terminated, otherwise you need to know the length already.)
2. Then define wchar[ calculated_length ] mystring;
3. Copy the content from wchar* into you array. mystring[0 ..
calculated_length ] = wcharptr[0 .. calculated_length];
4. If you want, you can do casting for your mystring to convert
it to wstring.
