Managed C++/CLI

Re: main form instance name

13-Jun-07 7:57

aaron_leese wrote:
int main(array ^args)
{

Application::Run(gcnew Form1());

Form1::textBox1->Text = "some text";

}
...........................................

This doesn't work of course, because I am referencing the header class itself, and not the form instance .... but what is the form instance ????

Hmm...seems to me this also doesn't work because Run() doesn't return until you exit the app by
closing the form.

Form1^ myForm = gcnew Form1; would work but it makes no sense to access controls in the form
before it's created.

Do you have a better example of what you're trying to do?

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

aaron_leese13-Jun-07 18:41

aaron_leese

13-Jun-07 18:41

sure .. here is all the grubby details....

I have a multithread program .... one thread monitors the gui events, the other looks for incoming midi messages.

There are certain midi messages that trigger subroutines .... and there are buttons that do the same. The gui appearance need to change to reflect when certain subroutines are running, etc.

most of the subroutines change some global variables, and the gui just polls those variables to determine the state of affairs and appear accordingly.

BUT ... sometimes this is not appropriate, and I need to get some of the subroutines to alter the gui directly. No problem is a button is pushed .... big problem if it's a midi command .... because that thread does not have access to the form elements.

so ... succinctly .... how do I get a thread to access a form which is running on another thread.

I think I can do it if i only knew the correct instance name of the generated form.

any thoughts ?

Aaron

Retrieve FileVersion of an exe

IamPoojaa11-Jun-07 1:45

IamPoojaa

11-Jun-07 1:45

Hi Frnz,

I need to find the version details of my exe file. My exe code is in C++. Can anybody help me for the same in C++ to find the Version of any exe.

Thnz in advance Sniff | :^)

poojaaa

Re: Retrieve FileVersion of an exe

Mark Salsbery11-Jun-07 7:55

still reflecting / major problem

11-Jun-07 7:55

First of all, please post non-managed C++ questions on the Visual C++/MFC board[^].

If your EXE has a VERSION resource, you can get it with the help of these APIs:

GetFileVersionInfoSize()
GetFileVersionInfo()
VerQueryValue()

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Xeef10-Jun-07 5:16

adding char arrays together for one function arg

10-Jun-07 5:16

can a reflected methode not return gcnew System::Windows::Forms::TextBox()

but just base types like INT ???

if not mean it can return TextBox

where do i go wrong ?

myType = SampleAssembly->GetType("Memory.What");
myObj = System::Activator::CreateInstance( myType );
myMethod = myType->GetMethod("Name");
myMethod->Invoke( myObj , nullptr ); <<<--- here is the error
i have a MessageBox::Show in Memory.What.Name wich is fiered and also shows TextBox->ToString() corect which shoud by returned
(ToString is for testing in the messagebox dont get confused)

An unhandled exception of type 'System.NullReferenceException' occurred in WhatsUp.exe
Additional information: Object reference not set to an instance of an object.

NZSmartie9-Jun-07 17:54

NZSmartie

9-Jun-07 17:54

opps wrong place

Reflection how to cast to loaded type

Xeef9-Jun-07 10:07

Re: Reflection how to cast to loaded type

9-Jun-07 10:07

hi all

System::Reflection::Assembly^ SampleAssembly;<br />
		System::Type^ myType;<br />
		System::Activator::Object^ myObj;<br />
<br />
		try {<br />
			SampleAssembly = System::Reflection::Assembly::LoadFrom( Path );<br />
		}<br />
		catch (System::IO::FileNotFoundException^ catchException) <br />
		{<br />
			Form->_TabCon->_PageStatus->StatusText->Text += catchException->ToString() + System::Environment::NewLine;<br />
			return 1;<br />
		}<br />
<br />
		try {<br />
			myType = SampleAssembly->GetType("Memory.What"); <br />
			if (!myType) throw (System::String^) "Can´t locate Base Function [incompatible plug ???]";<br />
		}	<br />
		catch (System::String^ catchException)<br />
		{<br />
			Form->_TabCon->_PageStatus->StatusText->Text += catchException + System::Environment::NewLine;<br />
			return 1;<br />
		}<br />
		myObj = System::Activator::CreateInstance( myType ); // creates the instance<br />
		<big>What^ W = (What^)myObj;</big>

how can i cast to "What^" ?
i tryed to have a .h .cpp file whit the same declaration as in "Memmory.what" but i get an error

An unhandled exception of type 'System.InvalidCastException' occurred in WhatsUp.exe
Additional information: Unable to cast object of type 'Memory.What' to type 'WhatsUp.What'.

sarah_malik9-Jun-07 12:03

sarah_malik

9-Jun-07 12:03

Try this:
What^ W = safe_cast<What^> (myObj);

Re: Reflection how to cast to loaded type

Xeef9-Jun-07 13:10

9-Jun-07 13:10

unfortunaly no Frown | :(

same error

this is where i am in the moment :

myType = SampleAssembly->GetType("Memory.What");
myObj = System::Activator::CreateInstance( myType );
System::Reflection::MethodInfo^ mi = myType->GetMethod("Ver");
mi->Invoke(myObj , nullptr );

so i can call the methode but its not to elegant there muss by some other way

so that i can call it like :

LoadedDLL->Ver();

C++ dll problem

sujithkumarsl8-Jun-07 0:11

sujithkumarsl

8-Jun-07 0:11

hi i am new in c++, just developed one c++ dll(win32) from VS2005.
I just want to know how can i use that dll from a simple console c++ application.
or from C#.
please help
[&]&&

My small attempt...

Re: C++ dll problem

Mark Salsbery8-Jun-07 4:41

Re: Best way to learn C++

8-Jun-07 4:41

An unmanaged C++ question which mentions C#...posted on the managed C++ board.

Please take your question to the appropriate board, before I call security... Poke tongue | ;-P

Visual C++/MFC[^]
C#[^]

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Best way to learn C++

Brad Fackrell7-Jun-07 7:46

Brad Fackrell

7-Jun-07 7:46

I’m trying to figure out what the best way is to learn C++. Book, on-line course etc. Has anybody here had any good or bad experiences with anything? I’m leaning towards some sort of self paced book.

I have some VB.NET background and one beginner level C++ class years ago. I remember nothing about the C++.

I need to learn enough to be able to take (and pass) a required upper level C++ class so that I can finish a degree that I’ve been working on for 10 years. Plus some C++ knowledge would be nice for my job.

Any help and or suggestions would be appreciated.

Thanks
Brad

Christian Graus7-Jun-07 12:32

Christian Graus

7-Jun-07 12:32

This is the C++/CLI forum. C++/CLI would be easier for you, seeing as it contains the .NET framework that you already know. But, if you want to learn C++, I recommend a book, and if you have any questions about c++, I recommend the Visual c++ forum.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Best way to learn C++

Brad Fackrell8-Jun-07 3:03

Brad Fackrell

8-Jun-07 3:03

Alright. Thanks Christian.

Linker Error LNK2001

Tal S.6-Jun-07 22:29

Tal S.

6-Jun-07 22:29

Hello,

I try to compile exe at VS2005 and get this error:

uafxcwd.lib(appcore.obj) : error LNK2001: unresolved external symbol ___wargv
uafxcwd.lib(appcore.obj) : error LNK2001: unresolved external symbol ___argc

Do you know what to look for?

Thanks!

Mark Salsbery7-Jun-07 5:25

7-Jun-07 5:25

Is it VS 2005 Express Edition?

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Tal S.10-Jun-07 22:15

Tal S.

10-Jun-07 22:15

Microsoft Visual Studio 2005
Version 8.0.50727.762 (SP.050727-7600)
Microsoft .NET Framework
Version 2.0.50727

Mark Salsbery11-Jun-07 6:18

11-Jun-07 6:18

hmmm I'm not sure - those variables should be in the C runtime (CRT) library.

I'm wondering if you're trying to make an MFC app with Visual Studio Express Edition.
That won't work.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Tal S.11-Jun-07 20:00

Tal S.

11-Jun-07 20:00

As making Libcmtd.lib - ignored (at linker) coused this problem...

Mark Salsbery12-Jun-07 6:25

2 way comunicaion betwean classes

12-Jun-07 6:25

Possibly. Try removing it. Also maybe make sure Ignore default libraries options are set to no.

You can also create a similar project from the wizard and look at its settings to give you a
starting point.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Xeef6-Jun-07 20:18

Re: 2 way comunicaion betwean classes [modified]

6-Jun-07 20:18

hi all

topic says it how can i do something like :
this ist NOT working but what ever i try i ending always by this problem -->

class1.h<br />
<br />
#pragma once<br />
<br />
ref class class1<br />
<br />
{<br />
<br />
public:<br />
<br />
class1(void);<br />
<br />
class2^ c2;<br />
<br />
};<br />
<br />
.cpp<br />
<br />
#include "StdAfx.h"<br />
<br />
#include "class1.h"<br />
<br />
#include "class2.h"<br />
<br />
class1::class1(void)<br />
<br />
{<br />
<br />
}<br />
<br />
 <br />
<br />
class2.h<br />
<br />
#pragma once<br />
<br />
ref class class2<br />
<br />
{<br />
<br />
public:<br />
<br />
class2(void);<br />
<br />
class1^ c1;<br />
<br />
};<br />
<br />
.cpp<br />
<br />
#include "StdAfx.h"<br />
<br />
#include "class2.h"<br />
<br />
#include "class1.h"<br />
<br />
class2::class2(void)<br />
<br />
{<br />
<br />
}

Mark Salsbery7-Jun-07 5:30

Re: 2 way comunicaion betwean classes

7-Jun-07 5:30

Add forward declarations to the header files:

class1.h

#pragma once

ref class class2;

ref class class1
{
public:
class1(void);
class2^ c2;
};

.cpp

#include "StdAfx.h"
#include "class1.h"
#include "class2.h"

class1::class1(void)
{
}

class2.h

#pragma once

ref class class1;

ref class class2
{
public:
class2(void);
class1^ c1;
};

.cpp

#include "StdAfx.h"
#include "class2.h"
#include "class1.h"

class2::class2(void)
{
}

-- modified at 11:57 Thursday 7th June, 2007

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Xeef7-Jun-07 7:15