system object == true or false????? - Managed C++/CLI Discussion Boards

monrobot27-Aug-03 3:51

monrobot

27-Aug-03 3:51

Anthony_Yio wrote:
instead of

// Propogate to all children
Notify(TabGroupBase.NotifyCode.DisplayTabMode);

This code is in the library which is written in C# so the .'s are correct.

Re: Using Magic Library

Anthony_Yio27-Aug-03 16:19

Anthony_Yio

27-Aug-03 16:19

Yes, the magic library is written in C# but when you are using MC++ syntax

You need to call using :: instead of .
the . mean different thing in MC++.

Sonork 100.41263:Anthony_Yio

typecasting void* to object

Katamneni29-Jul-03 2:39

Katamneni

29-Jul-03 2:39

Hi all
i am writing a Managed C++ class which internally using unmanaged classes.
For my class to work,i need to pass the callback function pointer to one of my unmanaged class as shown below
__gc class MyClass : System::Object
{
UnmanagedClass* pUMClass;
static MyStatic(void*,unsigned long,unsigned long);
MyClass(void)
{
pUMClass = new UnmanagedClass();
pUMClass->SetCallback(&MyClass::MyStatic);
}
}
is it possible pass Managed method pointer to unmanaged class?
if possible how can i type cast void* parameter to my class type(which i'm setting as client data).

Thanks in advance

redirect console telnet

sneaker28-Jul-03 12:39

sneaker

28-Jul-03 12:39

hi,
I want to redirect the windows telnet.exe to a MFC GUI (CRichEditCtrl).
I have manged to redirect cmd.exe but not the telnet.exe and the ftp.exe can someone help me. please E-mail me at

lior_zar@hotmail.com

DrawString

icdma26-Jul-03 7:46

icdma

26-Jul-03 7:46

I did a coordinate transformation to flip the X-AXIS in a Graphics object. All the plotting works great. But, when I use DrawString the text is flipped around the x-axis. Does DrawString not know about the coordinate transformation? How would one fix this?

Thanks for your help,

icdma

Re: DrawString

icdma26-Jul-03 7:47

icdma

26-Jul-03 7:47

Sorry, I flipped the Y-Axis not the X-AXIS. But DrawString flips around the x-axis...

using voice input in c++

gondal26-Jul-03 1:00

gondal

26-Jul-03 1:00

hi;
how can i input voice in a c++ program through microfone and is there any way that i can control my program written in c++ to work with voice commands....i really need detailed help........thanx

system object == true or false?????

Phil C25-Jul-03 13:27

Phil C

25-Jul-03 13:27

Ok, here's what must be the stupidest question on the board, but I have to ask.

I'm trying to migrate from C++ (VC6) to the new .NET style of managed C++.

I'm trying to enumerate any/all NIC cards on the sytem and get a list of valid IP addresses using System:ManagementClass object

At one point in my code I'm calling:

<br />
ManagementObject * mo = new ManagementObject();  <br />
//do some stuff to enumerate through possible multiple objcts<br />
//then find out if this "object" has an IP address<br />
mo->get_Item("IPEnabled")<br />

Now the question

This Get_Item() function returns a system object pointer. As I debug and step through my code, I can see this pointer does indeed point to an object which toggle between "true" and "false"

What I'm trying to do is simple:

<br />
if(mo->Equals(true))<br />
{<br />
      GO DO SOME STUFF<br />
}<br />

That if statement does not compile. calling Equals(false) compiles but always returns "true" (I guess because mo is not a NULL pointer) How do I test the value of a generic system object to see if it's "value" == true or false?????

This seems like it should be so simple, yet is turning out to be so hard is embarrassing. Can anyone point me in the right direction??

Phrustrated Phil

Re: system object == true or false?????

leppie25-Jul-03 13:45

leppie

25-Jul-03 13:45

Phil C wrote:
What I'm trying to do is simple:

if(mo->Equals(true))
{
GO DO SOME STUFF
}

What you are doing there is totally absurd! A ManagementObject can NEVER EVER be a Boolean.

Now if you are doing as you did originally, AFAIK you just need to unbox the return object pointer. EG

if (__unbox(mo->get_Item("IPEnabled")))
{
  //do the good stuff here
}

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

Re: system object == true or false?????

Phil C25-Jul-03 14:01

Phil C

25-Jul-03 14:01

Oops, I wrote it wrong while trying to trim away all the fat and make it legible.

What I'm trying should have read:

<br />
Object *booltest = mo->get_Item("IPAddress");<br />
<br />
if(booltest)<br />
{<br />
    DO STUFF<br />
}<br />
<br />
//or<br />
if(booltest->Equals(true))<br />
{<br />
    DO STUFF<br />
}<br />
<br />
//and about fifteen other attempts all of which aren't quite right<br />

Basically the entire mo->GetItem("IPEnabled") was originally inside my if statement (like you wrote) and I was (trying to) break it down into pieces to determine where I was going wrong.

Thank you for telling me I'm totally absurd. I was really hoping someone like you would tell me how stupid I am even though I admitted right up front that this is a pretty embarrassing question.

I think you did point me to the key statement though. I haven't figured out the whole box/unbox theory yet. For that I do thank you sincerely.

Less Phrustrated Phil

Can I pass a __gc array ptr as a pinned C array?

Jeremy Osner25-Jul-03 4:41

Jeremy Osner

25-Jul-03 4:41

If I declare a variable as

Int32 arr[] = __gc new Int32[100];

and I have a legacy function which takes a int * and count, is there any way to pass arr and 100 to that function? I'm thinking something along the lines of

Int32 __pin *ptr = arr;
f(ptr, 100);

Will this work? I mean arr is actually pointing to a System::Array, right?

READIN writin rhythmetic

Re: Can I pass a __gc array ptr as a pinned C array?

Nemanja Trifunovic25-Jul-03 5:38

Nemanja Trifunovic

25-Jul-03 5:38

Jeremy Osner wrote:
I mean arr is actually pointing to a System::Array, right?

arr is pointing to a class derived from System::Array.

Re: Can I pass a __gc array ptr as a pinned C array?

Jeremy Osner25-Jul-03 5:51

Jeremy Osner

25-Jul-03 5:51

Right -- so is there any way I can get an interior pointer to the memory that implements the array?

READIN writin rhythmetic

Re: Can I pass a __gc array ptr as a pinned C array?

Jeremy Osner25-Jul-03 6:19

Jeremy Osner

25-Jul-03 6:19

Yes!! I have found the solution at MSDN -- I pin the pointer to the first element of the array.

READIN writin rhythmetic

Re: Can I pass a __gc array ptr as a pinned C array?

leppie25-Jul-03 7:03

leppie

25-Jul-03 7:03

I was gonna say, I posted the "hack" a few days back Smile | :)

__int32 __pin * ptr = (int*)&array[0];

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

Re: Can I pass a __gc array ptr as a pinned C array?

Jeremy Osner25-Jul-03 7:54

Jeremy Osner

25-Jul-03 7:54

> __int32 __pin * ptr = (int*)&array[0];

Why do you put that (int *) cast in? The line compiles without the cast -- I would think the cast would generate a compiler error -- can't convert a __gc pointer to an unmanaged pointer. No?

READIN writin rhythmetic

Re: Can I pass a __gc array ptr as a pinned C array?

leppie25-Jul-03 8:02

leppie

25-Jul-03 8:02

Jeremy Osner wrote:
Why do you put that (int *) cast in? The line compiles without the cast --

&array[0] is of type (void*) . I just assumed C++ would complain Smile | :)

Normally I would just do a void __pin * ptr, and cast at function invocation.

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

Re: Can I pass a __gc array ptr as a pinned C array?

Jeremy Osner25-Jul-03 8:23

Jeremy Osner

25-Jul-03 8:23

If array is declared as Int32 array[], then the type of &array[0] is either Int32 __value * or Int32 __gc *, I think the first. You are taking the address of an element of the array, which will have whatever type you used in the array declaration.

READIN writin rhythmetic

Re: Can I pass a __gc array ptr as a pinned C array?

leppie25-Jul-03 13:50

leppie

25-Jul-03 13:50

Jeremy Osner wrote:
If array is declared as Int32 array[], then the type of &array[0] is either Int32 __value * or Int32 __gc *, I think the first. You are taking the address of an element of the array, which will have whatever type you used in the array declaration.

But alas, C does not care, all it wants is a pointer to expected data.

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

LNK4099 - PDB was not found...

Hans Ruck25-Jul-03 0:42

Hans Ruck

25-Jul-03 0:42

Does anyone know how to get rid of this warning? I see it any time i compile a new Class Library.

rechi

Re: LNK4099 - PDB was not found...

chassisman27-Aug-03 5:48

chassisman

27-Aug-03 5:48

I just ignore it since there are always bigger fish to fry.

Search yeilds the following:

'The linker was unable to find your .pdb file. Copy it into the directory that contains object/library.

To tell is your .lib and .pdb are properly matched:

Extract an object file from the library with lib /extract:objectname.obj xyz.lib.
Check the path to the .pdb file with dumpbin /headers objectname.obj'

I read that and decided if it ain't broke don't fix it.

pod

Re: LNK4099 - PDB was not found...

Hans Ruck27-Aug-03 21:25

Hans Ruck

27-Aug-03 21:25

chassisman wrote:
I just ignore it since there are always bigger fish to fry.

This is so... true Smile | :)

Thanx for the info.

rechi

error C2872: 'IDataObject' : ambiguous symbol

Katamneni25-Jul-03 0:11

Katamneni

25-Jul-03 0:11

Hi all
i am writing a custom control derived from UserControl in ManagedC++.This class is using third party unmanaged C++ classes(from VTK library) internally.
When i tried to build the control i got the following following error.

D:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\ObjIdl.h(7408): error C2872: 'IDataObject' : ambiguous symbol

Please somebody help me how to get rid of this error.

Thanks in advance

Regards
Kriohna

Re: error C2872: 'IDataObject' : ambiguous symbol

apferreira25-Jul-03 1:45

apferreira

25-Jul-03 1:45

Usually this error happens when the compiler is not able to determine which symbol you are refering to. A typical example is when you have two methods with the same name but defined in diferent namespaces used in the project. If this is the case try to use full namespaces when refering to them.

Where to get ATLMFC (in VC7) redistributable?

Anthony_Yio24-Jul-03 22:21

Anthony_Yio

24-Jul-03 22:21

I want to deliver my DLL which was written in VC++.net. I use CStringT extensively. When I try to run my DLL in a C# application in another machine which did not install Visual Studio.NET . It give exception problem.

How do I pack the ATLMFC in VC7.0?

I do not want it to be statically link because I had tested before and it give me problem saving some GDI32 functions is already in some of my other lib. Also I do not want my app to be bulky.

So, I would prefer dynamic bind. Where and how to get MFC7.0 redistributable?

Thank you

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