Managed to unmanaged TCHAR *

  • Thread starter Thread starter newcomer
  • Start date Start date
N

newcomer

hello,

I'm trying to invoke a function written in C that takes a
(TCHAR *) filename (which will convert to char * and use
fopen). In my managed code I have a String that I call
ToCharArray() on to get a unicode character array. I try
passing a reference to the first character into my dll
function, but it seems to throw a native exception. What
am I supposed to use in .NET CF? Thanks
 
odd. that's what I tried the first time, but it didn't
seem to work. Every time the DLL tries reading the
string, it has a native exception.
 
oh, I might've found the problem. The function might be
expecting a normal char *. well, thanks for the tips.
 
Try changing the p/invoke signature to take a byte[], and use
Encoding.ASCII.GetBytes on the unicode string. That should give you the
narrow character string.

Mike Boilen
Developer
.NET Compact Framework

This posting is provided "AS IS" with no warranties, and confers no rights.
http://www.gotdotnet.com/team/netcf/FAQ.aspx

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| From: "newcomer" <[email protected]>
| Sender: "newcomer" <[email protected]>
| References: <[email protected]>
<[email protected]>
| Subject: Re: Managed to unmanaged TCHAR *
| Date: Tue, 21 Oct 2003 15:45:47 -0700
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| odd. that's what I tried the first time, but it didn't
| seem to work. Every time the DLL tries reading the
| string, it has a native exception.
|
| >-----Original Message-----
| >Just use a string.
| >
| >--
| >Chris Tacke, eMVP
| >Co-Founder and Advisory Board Member
| >www.OpenNETCF.org
| >---
| >Windows CE Product Manager
| >Applied Data Systems
| >www.applieddata.net
| >
| in message
| >| >> hello,
| >>
| >> I'm trying to invoke a function written in C that
| takes a
| >> (TCHAR *) filename (which will convert to char * and
| use
| >> fopen). In my managed code I have a String that I call
| >> ToCharArray() on to get a unicode character array. I
| try
| >> passing a reference to the first character into my dll
| >> function, but it seems to throw a native exception.
| What
| >> am I supposed to use in .NET CF? Thanks
| >
| >
| >.
| >
|
 
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