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

Re: debug managed and unmanaged code

leppie17-Jul-03 7:37