Managed C++/CLI

21-Jul-03 17:20

Hey,
First of all, I would like to say with only being a member of this site for a little while, I have found it very useful. I am pretty much a newbie in programming and don't know much about compiler and linker errors. I get this error when trying to compile.

playSound.obj : error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (playSound): (0x02000005).

LINK : fatal error LNK1255: link failed because of metadata errors

Anybody know what this is? If you need source code I can give it. I am sure I included all the includes and libraries. Thanks.

Also does anybody know how to convert a String to a LPCWSTR? I hadn't heard of LPCWSTR before but appears to be some other kind of string.
example:

String * str = S"Hello";<br />
// Convert str to a LPCWSTR so I can pass it into a function<br />
<br />
somefunction(MyConvertedString)

Double thanks.

Jeremy Osner22-Jul-03 7:24

Jeremy Osner

22-Jul-03 7:24

I can't answer your linker question but an LPCWSTR is a char pointer -- see the thread lower on this page regarding PtrToStringChars().

READIN writin rhythmetic

Slaru22-Jul-03 7:49

22-Jul-03 7:49

Thanks for answering my second question. Is there anyone who knows what my linker problem is or who can give tips to fix it?

jspano22-Jul-03 15:14

jspano

22-Jul-03 15:14

I believe that your first error is from a type that is defined 2x and differently each time. Check that in your playsound files.

Slaru22-Jul-03 17:10

Serial COM port in Managed C++

22-Jul-03 17:10

I have fixed both problems. Thanks. I made my class all inline and that fixed my linker errors whatever they were. Case closed.

icdma21-Jul-03 6:37

icdma

21-Jul-03 6:37

Has anyone implemented Albert's article, "How to open a serial COM port in Managed C++, By Albert Pascual"

After I boot up my WinXP Pro system, Albert's implementation only works after I start up HyperTerminal. After that, it works fine from then on... Any clues? Has anyone else run into this on XP.

Thanks in Advance!

Re: Serial COM port in Managed C++

icdma26-Jul-03 7:43

icdma

26-Jul-03 7:43

I worked through this. The code provided in the article is not sufficient to make the serial port work properly.

icdma

strange compiler error

Slaru20-Jul-03 13:06

Re: strange compiler error

20-Jul-03 13:06

Hi,
I am learning C++ and Windows Forms and get a strange compiler error. I am using the directX header dshow.h for my project and when I do I get this error:

error C2039: 'GetObjectA' : is not a member of 'System::Resources::ResourceManager'
stdafx.cpp(0) : see declaration of 'System::Resources::ResourceManager'

and it points to this code:

this->ButtonImages->ImageStream = (__try_cast<System::Windows::Forms::ImageListStreamer *  >(resources->GetObject(S"ButtonImages.ImageStream")));

and this was all generated by the designer.

I also get something similar when I try to use the MessageBox class. If I don't imclude dshow.h than these errors go away.

Any reasons and fixes are appreciated. Thanks.

Nemanja Trifunovic20-Jul-03 15:10

Nemanja Trifunovic

20-Jul-03 15:10

That's because preprocessors are stupid. When a preprocessor finds GetObject, it replaces it with GetObjectA or GetObjectW, depending whether you compile a Unicode version or not.

Just put something like

#undef GetObject

after #include <windows.h>
and everything should work fine.

static __gc[] @#$@

leppie19-Jul-03 22:04

19-Jul-03 22:04

Hi all

HTF do you declare it? Now I know why it is called C++, like C, but you are require to do 2 things extra for every bloody thing@!!!

OK so I had this in C:
static Int32 rNums[512] = { 123,1231,....,2131};
In MC++ I try:
static Int32 rNums __gc[] = {123,1231,....,2131};

No luck, Int32 is defined. The error messages are useless as usual! Compiling as C++ with /clr.

at the declaration:
randtable.c(71) : error C2146: syntax error : missing ';' before identifier 'rNums'
randtable.c(71) : error C3150: '[' : '__gc' can only be applied to a class, struct, interface, array or pointer

at the end of the array:
randtable.c(123) : error C2501: 'leppie::RandomNumbers::rNums' : missing storage-class or type specifiers
randtable.c(123) : error C3845: 'leppie::RandomNumbers::rNums' : only static data members can be initialized inside a __gc class or value type

ANy one?

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

leppie19-Jul-03 22:31

19-Jul-03 22:31

OK I dont get this...

AT stattement level I can do this:

Int32 rNums __gc[] = {11,112,334,...,6667,8567};
But NOT at class level for a static instance. Nor can I do assignment at statement level, ie:

Int32 rNums __gc[];<br />
<br />
rNums = {11,112,334,...,6667,8567};

According to the docs the behaviour is the same as C++...

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Solved :)

leppie19-Jul-03 23:14

19-Jul-03 23:14

Had to add a const and it worked fine Smile | :)

I should have expected something like that!!! Mad | :mad:

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Tom Archer20-Jul-03 3:32

20-Jul-03 3:32

__value struct V
{
  static Int32 rNums[] = { 123, 345 };
  static String* names[] = { S"ABC", S"DEF" };
};

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

leppie20-Jul-03 5:01

20-Jul-03 5:01

It doesnt appear to work so for a __gc class though, and what is the difference between:

__value struct<br />
__value class<br />
__gc class<br />
__gc struct

?

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Tom Archer20-Jul-03 5:10

Problem Compiling MFC under VC++ .NET

20-Jul-03 5:10

leppie wrote:
It doesnt appear to work so for a __gc class though

What exactly isn't working?

leppie wrote:
what is the difference between:

__value struct
__value class
__gc class
__gc struct
?

The only difference here is the __value will allocate a managed type on the native stack and __gc will allocated a managed type on the CLR heap.

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

Cristi76200019-Jul-03 4:40

Cristi762000

19-Jul-03 4:40

I tried to compile MFC project using Visual Studio .NET Architect version 7.0.9466. I used the wizerd to generate a minimal project that suport MFC. At compilation time I get the following

fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'f:\vs70builds\9466\vc\Compiler\Utc\src\P2\main.c', line 146)

When I comment out the #include <afx.h> the compilation succeded.

What happen I have an old version of VS .NET

PLEAASE can somebody help me

Cristi

Mad | :mad:

Re: Problem Compiling MFC under VC++ .NET

Tom Archer20-Jul-03 3:37

Re: Problem Compiling MFC under VC++ .NET

20-Jul-03 3:37

I've been programming mixed-mode apps for about a year without this sort of problem. Send me this project you've speaking of and I'll take a look at it. - tarcher@mindspring.com[^]

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

Anonymous20-Jul-03 20:14

Anonymous

20-Jul-03 20:14

Hello

I have the same problem with any project in MFC even with the ones that are generated by Wizard. I have some experience in MFC, I think that could be something with my instalation kit. So if I send you the project will not help because the problem apears with any MFC project.

Convert a String to a char array

Slaru18-Jul-03 12:51

18-Jul-03 12:51

Hey,
I am pretty new to C++ and Visual C++. Managed C++ offers Strings which are very useful. I would like to be able to copy or convert a String to a char array. I need to because I am trying to transfer this String into a function that is unmanaged and excepts char arrays.

Tom Archer19-Jul-03 4:26

19-Jul-03 4:26

<br />
#include <vcclr.h><br />
...<br />
String* s = S"Hello";<br />
const __wchar_t __pin * str = PtrToStringChars(s);<br />

By the way, this is covered in Nish's and my new book on mixing MFC and Managed C++ code. See sig if interested.

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

leppie19-Jul-03 22:59

19-Jul-03 22:59

or:

__wchar_t __pin * str = &s->ToCharArray()[0];

It's ugly, but a nice hack to convert __gc[] to *.

Note: even though the NULL character is not returned by ToCharArray(), the CLR seems to pin it in some "clear" space. Smile | :)

Any reason why you add the const keyword? Doesnt __pin take care of that?

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Tom Archer20-Jul-03 3:26

20-Jul-03 3:26

The PtrToStringChars is more efficient as it simply returns a casted pointer to the string's internal buffer. By comparison, the String::ToCharArray method creates a brand new copy of the string and returns that to the caller.

leppie wrote:
Any reason why you add the const keyword?

The PtrToStringChars function returns a const System::Char* cast of the internal string value.

Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson

leppie20-Jul-03 5:04