473,663 Members | 2,867 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Marshalling an argument of "char*" using IJW metho

hello,

i am trying to wrap an unmanaged C++ code to managed one so that i can
use it within c#, and i am using IJW - "It Just Works" - method for
that. In the code, there is a function which takes a "filename" as
one of its arguments and the type of that is "char*". In the
documents of msdn, "char*" is mapped to String or
StringBuilder[in,out] by marshaller. although i searched in the
goggle, i couldnt find any kinds of simple-because I am not an
experienced enough- sample code that uses IJW method. I found always
the ones which uses PInvoke method.

Can anyone help me with marshalling "char*" type with IJW method by a
simple sample code?

Thanks!

*-----------------------*
Posted at:
www.GroupSrv.com
*-----------------------*
Nov 16 '05 #1
1 1635
Can anyone help me with marshalling "char*" type with IJW method by a
simple sample code?


You may want to post to microsoft.publi c.dotnet.langua ges.vc instead.

But if you get a managed String as input from the C# caller, you
typically pin it, then use the pinning pointer as an LPWSTR and use
for example WideCharToMulti Byte to convert it to an ANSI string.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Nov 16 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

4
2042
by: Rob Smeets | last post by:
Hi all, I have the following problem: I have to revise a c++ dll. And i'm new to c++. I have to change a function, but i cannot change it's structure. I want to check the parameters and act according to those parameters. I've tried several ways to resolve it, but without success. Could anybody help? Thanks in advance. Rob Smeets
12
2023
by: Vaca Louca | last post by:
Hello, I write an ISAPI authentication module which uses Berkeley DB and want it to be as efficient as possible. Both ISAPI and BerkeleyDB use arrays of chars (char *) to pass and receive information. I know that C++ strings are supposed to be the "right" way to handle strings but I suspect that converting "char *" to string
13
2506
by: baumann.Pan | last post by:
when define char *p = " can not modify"; p ='b' ;is not allowed, but if you declare p as char p = "can modify"; p = 'b'; is ok? why?
4
10688
by: John Devereux | last post by:
Hi, I would like some advice on whether I should be using plain "chars" for strings. I have instead been using "unsigned char" in my code (for embedded systems). In general the strings contain ASCII characters in the 0-127 range, although I had thought that I might want to use the 128-255 range for special symbols or foreign character codes. This all worked OK for a long time, but a recent update to the compiler on my system has...
9
1269
by: Gary | last post by:
Hi all! I've taken some time on learning the difference between "pointers to const variables" and "const pointer variables". The question is: in the following code, can we change the contents of the const pointer (i.e. t)? I got a segmentation fault in the last for loop. I wrote the code in c++, but the language is not the point, right? :) Thanks in advance! #include <iostream>
26
11704
by: =?gb2312?B?wNbA1rTzzOzKpg==?= | last post by:
i wrote: ----------------------------------------------------------------------- ---------------------------------------- unsigned char * p = reinterpret_cast<unsigned char *>("abcdg"); sizeof(reinterpret_cast<const char *>(p)); ----------------------------------------------------------------------- ---------------------------------------- the compiler tells me that "reinterpret_cast from type "const char * " to type "unsigned char *"...
20
3539
by: liujiaping | last post by:
I'm confused about the program below: int main(int argc, char* argv) { char str1 = "abc"; char str2 = "abc"; const char str3 = "abc"; const char str4 = "abc"; const char* str5 = "abc";
4
8395
by: Virtual_X | last post by:
some function make the data type of it's parameters as "const char*" why not use char or char* instead what would be different
14
307
by: Anna | last post by:
I try to put 8 int bit for example 10100010 into one character of type char(1 octet) with no hope . Could anyone propose a simple way to do it? Thank you very much.
0
8345
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
8858
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
8771
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
8548
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
7371
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
6186
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5657
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
2
2000
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
2
1757
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.