Pass LPWSTR to C#

Asked Jan 08 '18 at 14:22

Active Jan 08 '18 at 14:37

Viewed 176 times

I'm working on a 'C++' project, that involves printing. To simplify some operations, I've written a piece of code in 'C#', and I have created a dll. One of the methods in 'C#' code has this signature:

public bool PrintPDF(String printer, String sheetFormat, String path, int copies)

Then I've imported it in 'C++' this way:

#using <MyDll.dll>

I'm trying to pass LPWSTR to this method from 'C++' native code, but even if I read many posts and docs, I cannot achieve this.

Can anyone help?

edited Jan 08 '18 at 14:37

Hans Passant

922,412
146
1,693
2,536

asked Jan 08 '18 at 14:22

Matteo Meil

1,192
10
20

What is your code? What's the error? – user202729 Jan 08 '18 at 14:24
C++ or managed C++? – Gusman Jan 08 '18 at 14:24
You need a type that is supported in both languages. I would suggest `char *`. – stark Jan 08 '18 at 14:25
.net & c++ types https://msdn.microsoft.com/en-us/library/0wf2yk2k.aspx – Cleptus Jan 08 '18 at 14:26
@stark - given that `System.Char` is a 16-bit data type, I would have expected `wchar_t*` (which is what `LPWSTR` is typedef'ed to) to be at least as well as supported as `char*`. – Martin Bonner supports Monica Jan 08 '18 at 14:30
To expand on Gusman's question: Are you prepared to use Microsoft's extension to C++ called "managed C++" which allows direct access to .Net types and methods? – Martin Bonner supports Monica Jan 08 '18 at 14:32
D'oh! You are using `#using` so you are *already* using Managed C++. – Martin Bonner supports Monica Jan 08 '18 at 14:33
1

Use `gcnew String(var)` where var is your lpcwstr variable. – Hans Passant Jan 08 '18 at 14:35
@Gusman - I'm using C++ / CLI (I started a new CLR project in visual studio) – Matteo Meil Jan 08 '18 at 14:38
@Martin Bonner - I'm not prepared to use Managed C++. I searched a lot in internet but the result was a lot of confusion. – Matteo Meil Jan 08 '18 at 14:39
@HansPassant : Bother - your tag edit removed my Mjolnir. (I think it was correct though.) – Martin Bonner supports Monica Jan 08 '18 at 14:45
@MatteoMeil C++ / CLI is managed C++. – Gusman Jan 08 '18 at 14:52

Pass LPWSTR to C#

0 Answers0