Managed C++/CLI

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

Slaru

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

20-Jul-03 5:04

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

But I have never really understood a const parameter, it appears like reverse psychology to me.

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

Tom Archer20-Jul-03 5:11

20-Jul-03 5:11

const has nothing to do with __pin. The former simply means that you won't change the value. The latter is used so that the CLR will not move the data in memory.

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

debug managed and unmanaged code

Anthony_Yio24-Jul-03 22:29

Anthony_Yio

24-Jul-03 22:29

Simpler way is to use ATLMFC.

<br />
#include <atlstr.h>	// CString support.<br />
<br />
String* strSomething;<br />
CString str = strSomething;

But you will need to find a way to pack your ATLMFC7.0 redistributable when you release your app.

Hope this helps.

jspano17-Jul-03 4:28

jspano

17-Jul-03 4:28

How do you debug managed code that used unmanaged code? I have several managed functions that call functions that are unmanaged. If I use #pragma unmanaged on the unmanaged functions to get compiled code out of them, I can't step into them from the managed code. I have the debug properties of the project set to Mixed. Auto doesn't work either. What other settings am I missing?

TIA

leppie17-Jul-03 7:37

17-Jul-03 7:37

I have never had problems. Perhaps optimizations are turned on?

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

jspano17-Jul-03 7:46

jspano

17-Jul-03 7:46

I checked them to be sure and they are off for debug compile. I really haven't changed the settings much. I started a managed C++ dll project and change a few things like /noentry on, precompiled headers off, changed additional dependencies to be (odbc32.lib odbccp32.lib Netapi32.lib msvcrt.lib)

Thanks

PS also if I remove all the pragma's to make the entire thing managed code it works fine.

PSS I create a simple console .net app, added an unmanaged function and it works fine. The only difference between the 2 is one is a dll the other is an exe. I compared the setting of my dll to the console app and made sure they matched. A couple were off, but even when I changed them I still can't step in to the managed code in my dll.

Nathan Blomquist17-Jul-03 9:45

Nathan Blomquist

17-Jul-03 9:45

Yeah, I am having the same outcome. I have functions with embedded asm and when I try to jump into those functions, I can't. I just jump over them. It seems that if the compiler deems that the function must be compiled as x86 code directly (ie not MSIL and then jitted) you can't jump into them Frown | :(

-Nathan

P.S. 100th post... Big Grin | :-D

I need to post more or something; I am behind a lot of others with the same CP age as me.

---------------------------
Hmmm... what's a signature?

leppie17-Jul-03 11:05