Managed C++/CLI Discussion Boards

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Re: Hex Editing

Richard Andrew x6429-Mar-07 11:38

Richard Andrew x64

29-Mar-07 11:38

If you had a specific technical question, that would help.

If you don't know the first thing about writing a program, I suggest you examine some beginner's books and tutorials.

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"All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke

Re: Hex Editing

Christian Graus29-Mar-07 15:31

Christian Graus

29-Mar-07 15:31

well, first of all, you could ask in the right forum. This is the C++/CLI forum. Second, you could try asking a specific question, instead of one that is very hard to answer properly, because it is so broad.

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 )

pccts / antlr parser generator question (Includes)

ruudruud29-Mar-07 5:40

ruudruud

29-Mar-07 5:40

I am looking for an experienced pccts / antlr user!

I have made a (c++) parser using Antlr, now I like to
allow INCLUDE statements in my target files for this
parser.

How to implement this?

So, while parsing, I like my compiler to switch to
another file as it finds the INCLUDE statement as
if it was part of the (main) target file.

Is there a sample project available with such option?

Please respond (or mail to ruudvdmeer@hotmail.com )

Re: pccts / antlr parser generator question (Includes)

Richard Andrew x6429-Mar-07 11:41

Richard Andrew x64

29-Mar-07 11:41

You'll have to implement something called a Preprocessor. The preprocessor looks at the files before the parser ever sees them, and it writes an output file that contains all the "INCLUDE" files in the right order.

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"All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke

connectivity of c++ with sql only

p_28-Mar-07 20:48

28-Mar-07 20:48

hi all
i want to know about the connectivity of c++ with database sql and
how can i fetch and eneter data into sql database from my front end c++
thanks all
please send me this answer in detail

Re: connectivity of c++ with sql only

p_28-Mar-07 22:15

28-Mar-07 22:15

please tell me the code for this
thanks

Re: connectivity of c++ with sql only

Mark Salsbery29-Mar-07 7:07

Mark Salsbery

29-Mar-07 7:07

Maybe you'll get lucky and someone will code this for you, but I doubt it.

See here[^] for possible methods of connecting to a database.

Pick a technology and I'm sure you'll find plenty of example articles here.

Mark

"If you can dodge a wrench, you can dodge a ball."

Re: connectivity of c++ with sql only

prasad_som28-Mar-07 23:21

prasad_som

28-Mar-07 23:21

paras_s12 wrote:
please send me this answer in detail

1. You have correctly posted this question in VC++ forums, which is most appropriate for this question. So dont cross post.
2. Be patience enough, give time to others to solve your query.
3. Don't go against community rule/spirit, by asking question in rude manner.
4. Finally, Read this[^] post, before posting any further questions in this forum.

Prasad
Notifier using ATL | Operator new[],delete[][^]

get valid time from time with wildcards as string(eg. h*:m*))

krishna_m28-Mar-07 20:16

krishna_m

28-Mar-07 20:16

Hello,

I have time hh::mm as string. This string can have * as wildcard .
So,
if time is 13:1*, whenever i query for the next valid time, this should be 13:10,13:11....13:19.

if time is 13:**, the next valid time should be 13:00,13:01,...13:10,13:11,......13:59.

I am finding it difficult to implement this. Sigh | :sigh:

(in C++)can anybody help me out by suggesting some algorithm.

thanks in advance.

Re: get valid time from time with wildcards as string(eg. h*:m*))

George L. Jackson29-Mar-07 6:01

George L. Jackson

29-Mar-07 6:01

Use Regular Expressions! You can find the classes you need in the System.Text.RegularExpressions namespace. However, if your question isn't about C++/CLI, you are in the wrong forum. Nevertheless, you can use ATL's CAtlRegExp class (http://msdn2.microsoft.com/en-us/library/k3zs4axe(VS.80).aspx[^]) or Boost's regex class (http://www.boost.org/libs/regex/doc/index.html[^]).

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Re: get valid time from time with wildcards as string(eg. h*:m*))

krishna_m29-Mar-07 23:39

krishna_m

29-Mar-07 23:39

I got it. Thanks.

Loading and Freeing Assemblies [modified]

Richard Andrew x6428-Mar-07 14:07

Richard Andrew x64

28-Mar-07 14:07

As far as I know, ordinary .NET languages do not provide a means to deterministically unload an assembly once it has been loaded by the CLR.

Does this hold true also for C++/CLI?

I would like to be able to unload assemblies for the purpose of auto-updating them while leaving the app's main assembly running. Is this possible?

While I'm at it, am I allowed to use LoadLibrary() and FreeLibrary() with a mixed-mode assembly, or must I use Assembly.Load() ?

-- modified at 20:24 Wednesday 28th March, 2007

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"All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke

Re: Loading and Freeing Assemblies

George L. Jackson29-Mar-07 11:39

George L. Jackson

29-Mar-07 11:39

LoadLibrary and FreeLibrary is used in unmanaged code. I haven't used it with C++/CLI but I believe it can be used to load native DLLs. If you want to load managed assemblies, you use Assembly.Load. However, if you want to have the freedom of loading and unloading assemblies I believe you must create an AppDomain. I have not verified this, so you need to do your own research.

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Re: Loading and Freeing Assemblies

Richard Andrew x6429-Mar-07 11:47

Richard Andrew x64

29-Mar-07 11:47

Thanks, George. Info on C++/CLI seems a little hard to come by, so I guess I'll have to do some experimentation.

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"All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke

Re: Loading and Freeing Assemblies

Nish Nishant1-Apr-07 3:20

Nish Nishant

1-Apr-07 3:20

Richie308 wrote:
Thanks, George. Info on C++/CLI seems a little hard to come by, so I guess I'll have to do some experimentation.

What George suggested is the only way to do what you want. You cannot directly unload an assembly without unloading all appdomains that have loaded that assembly. And if your primary appdomain has loaded the assembly, this means you cannot unload the assembly at all without exiting the application.

The way to do this is to have a secondary appdomain, load the temporary assemblies there, and when you are done just unload the secondary appdomain - this will unload all assemblies used by that appdomain that are not otherwise in use.

By the way I wouldn't call this C++/CLI specific information - this would fall under general .NET in my opinion Smile | :)

Regards,
Nish

Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
C++/CLI in Action (*E-Book is out, Print version April 6th*)

What constitutes a mixed type

Richard Andrew x6427-Mar-07 10:03

Richard Andrew x64

27-Mar-07 10:03

I am studying Nish's book C++/CLI in Action. In it, we learn that mixed types are not supported, but yet the book shows a wrapper for the Desktop API's that contains functions that mix native types with managed types.

For instance, some of the functions use an HDESK type alongside managed types.

So my question is, what exactly is not supported when they say "mixed types are not supported?"

--------------------------------

"All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke

Re: What constitutes a mixed type [modified]

George L. Jackson27-Mar-07 11:11

George L. Jackson

27-Mar-07 11:11

You need to reread "4.3 Using mixed types". He said the C++/CLI compiler does not directly support mixed types. A "ref class" with a member field that is a native class is considered a mixed type. However, a pointer to a native class can be a field of a "ref class":

It is not supported here:

class NativeFoo
{
  // ...
};

ref class ManagedFoo
{
  NativeFoo m_foo;
};

But it is here:

ref class ManagedFoo
{
  NativeFoo* m_foo;

  ~ManagedFoo()
  {
    this->!ManagedFoo();
  }

  !ManagedFoo()
  {
    delete m_foo;
  }

};

However, using "NativeFoo* m_foo" does not lead to safe and reliable code since the developer is responsible for managing its resource. See http://msdn2.microsoft.com/en-us/library/aa730837(vs.80).aspx[^] for more information.

-- modified at 18:04 Tuesday 27th March, 2007

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Re: What constitutes a mixed type

Richard Andrew x6427-Mar-07 12:05

Richard Andrew x64

27-Mar-07 12:05

Thanks for you post. I will study that document. Smile | :)

--------------------------------

"All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke

std::string.insert

Andy H27-Mar-07 6:08

Andy H

27-Mar-07 6:08

Can some kind soul tell me how to insert a char imediately after every occurance of another char in a string.

Re: std::string.insert

Nish Nishant27-Mar-07 6:14

Nish Nishant

27-Mar-07 6:14

Andy H wrote:
Can some kind soul tell me how to insert a char imediately after every occurance of another char in a string.

Please ask in the Visual C++ forum. This one's for C++/CLI related queries.

Regards,
Nish

Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
C++/CLI in Action (*E-Book is out, Print version April 6th*)

Generated C++ from designer causes exception in CodeDOM [modified]

SE_GEEK26-Mar-07 11:33

SE_GEEK

26-Mar-07 11:33

I am experiencing a rather irritating problem in a Managed C++ application I have written. I have a form that is using a custom control that I wrote in C#. The code runs correctly, however whenever the designer generates the C++ code in the ".h" file for the form it prefixes the type of my control with a "::". This causes an exception in the CodeDOM parser when I then try to use the design view of the form.

The custom control is called ImageDisplay, and it is within a namespace of ImageDisplay.

Here is the offending line of code:

this->imageDisplayFront = (gcnew ::ImageDisplay::ImageDisplay());

If I change the line to:

this->imageDisplayFront = (gcnew ImageDisplay::ImageDisplay());

Then all is well in the universe until the next time I make a change in the designer that generates code. Is there a trick I can do to keep whatever is generating this code from adding the extra "::"?

I am running Visual Studio 2005 with service pack 1.

-- modified at 9:03 Tuesday 27th March, 2007

Truly wise men don't play leap frog with Unicorns.

Run time code generation

Bhupinder Sodhi25-Mar-07 23:14

Bhupinder Sodhi

25-Mar-07 23:14

Hii guys,
i need your help in understanding the concept "Rum time code generation" .
I want to make a program which should insert some code in other running program without any re-compilation and re-link. i know this is possible. But i dont know to implement it as i am beginner to programming.

Thanks
Bhupinder Sodhi

Re: Run time code generation

Mark Salsbery26-Mar-07 10:59

Mark Salsbery

26-Mar-07 10:59