Re: Function Pointers and ctors. [modified] - C / C++ / MFC Discussion Boards

Re: GetThreadId - kernel32.dll

Chris Meech1-Nov-06 4:29

Chris Meech

1-Nov-06 4:29

What version of Windows are you running it on? According to this[^], it's not available on all versions.

Chris Meech

I am Canadian. [heard in a local bar]

Nobody likes jerks. [espeir]

The zen of the soapbox is hard to attain...[Jörgen Sigvardsson]

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Re: GetThreadId - kernel32.dll

edvintas1-Nov-06 4:39

edvintas

1-Nov-06 4:39

hmm.. i am using windows xp Smile | :)

but how then i can send message to the thread process...? Confused | :confused:

int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow )
{
    HANDLE pKhwnd;
    pKhwnd = CreateThread(0, 0, pKhookThread, &hInstance, 0, 0); 
	WaitForSingleObject(pKhwnd, 10000);
	PostThreadMessage(GetThreadId(pKhwnd), WM_DESTROY, 0, 0);
	//Sleep(10000);
	FileWrite("Application Terminated");
    return 0;
}

what function i have to use to get thread id? D'Oh! | :doh:

Re: GetThreadId - kernel32.dll

Chris Meech1-Nov-06 5:16

Chris Meech

1-Nov-06 5:16

Not knowing what your thread function does, just because you create a thread, what makes you think it will accept or handle your message? Possibly some of the articles here[^] might help you out.

Re: GetThreadId - kernel32.dll

edvintas1-Nov-06 6:21

edvintas

1-Nov-06 6:21

that thread listens for messages Smile | :)

so WM_DESTROY should terminate thread process... D'Oh! | :doh:

Re: GetThreadId - kernel32.dll

Hamid_RT1-Nov-06 5:23

Hamid_RT

1-Nov-06 5:23

What is input parameter?

WhiteSky

Re: GetThreadId - kernel32.dll

Niklas L1-Nov-06 20:46

Niklas L

1-Nov-06 20:46

Please don't spam the forum with posts like this. If you don't have a clue, you should just for once try to _not_ post a reply to a question. In this case, the parameters are perfectly legal, and has absolutly nothing to do with his problem. The only thing this kind of reply is doing is to make the question look answered, and it will not show up when clicking the 'unanswered questions' link above. Thus, instead of helping, these kind of posts actually reduces the chance of getting an answere to a question. If this was just a one-timer, I wouldn't be bothered, but you do this over and over again.

home

Function Pointers and ctors.

Chris Meech1-Nov-06 2:35

Chris Meech

1-Nov-06 2:35

How would one declare a function pointer and initialize an array of those pointers to different constructors. I'm declaring an array of structures like the following

typedef struct tagExtractOps
{
  CString    strExtractName;
  int        nCtorCount;
  CTOR*      pConstructors[];
} ExtractOps;

const  int  NUMBER_OF_OPS    =    3;

ExtractOps[NUMBER_OF_OPS]    =    {"OP_1",2,{ctorA,ctorB},"OP_2",3,{ctorA,ctorC,ctorD},"OP_3",1,{ctorE}};

for ( int i = 0; i < NUMBER_OF_OPS; i++ )
{
    for ( int j = 0; j < ExtractOps[i].nCtorCount; j++ )
    {
        Parent*     pExtract    =   (Parent*) new Extractops[i].pConstructors[j];
        if ( pExtract )
        {
            ....  do a bunch of operations on pExtract

            delete pExtract;
        }
    }
}

In this example, all of the classes inherit from class Parent and all the operation I call are either defined in the parent or are virtual functions.

Re: Function Pointers and ctors. [modified]

benjymous1-Nov-06 3:42

benjymous

1-Nov-06 3:42

The only way I can think of doing it, is using an factory of some sort
[edit] Re-written into something that actually compiles! [/edit]

enum EClasses
{
	EClassA=0,
	EClassB,
	EClassC,
	EClassD,
	EClassE,
};

Parent* CreateObject( EClasses type )
{
  Parent* pObj = NULL;
  
  switch( type )
  {
  case EClassA:
    pObj= new CClassA();
    break;

  case EClassB:
    pObj= new CClassB();
    break;

    ..etc..
  }

  return pObj;
}

const int MAX_CLASSES = 10;

typedef struct tagExtractOps
{
	std::string strExtractName;
	int			nCtorCount;
	EClasses	pClasses[MAX_CLASSES];
} TExtractOps;

const  int  NUMBER_OF_OPS    =    3;

TExtractOps ExtractOps[NUMBER_OF_OPS] =  {"OP_1",2,{EClassA,EClassB},"OP_2",3,{EClassA,EClassC,EClassD},"OP_3",1,{EClassE}};

for ( int i = 0; i < NUMBER_OF_OPS; i++ )
{
	for ( int j = 0; j < ExtractOps[i].nCtorCount; j++ )
	{
		Parent*     pExtract    =  CreateObject( ExtractOps[i].pClasses[j] );
		if ( pExtract )
		{
			//....  do a bunch of operations on pExtract

			delete pExtract;
		}
	}
}

-- modified at 9:58 Wednesday 1st November, 2006

--
Help me! I'm turning into a grapefruit!
Buzzwords!

Re: Function Pointers and ctors.

Chris Meech1-Nov-06 4:18

Chris Meech

1-Nov-06 4:18

Thanks. I'll give some thought to a class factory. Ultimately I'm trying to avoid coding some gigantic switch statment that just implements the assignment and 'new' operations. I trying to figure out a way to just code that line once.

Re: Function Pointers and ctors.

benjymous1-Nov-06 4:42

benjymous

1-Nov-06 4:42

A colleague of mine is a big fan of using complex define systems

something like:

ClassDefinitions.h

DECLARE_CLASS( ClassA )
DECLARE_CLASS( ClassB )
DECLARE_CLASS( ClassC )

enum EClasses
{
#define DECLARE_CLASS( unique_class_name ) E##unique_class_name,
#include "ClassDefinitions.h"
#undef DECLARE_CLASS
}

Parent* CreateObject( EClasses type )
{
	Parent* pObj = NULL;

	switch( type )
	{
#define DECLARE_CLASS( unique_class_name ) \
	case E##unique_class_name: \
	  pObj= new C##unique_class_name(); \
	  break;
#include "ClassDefinitions.h"
#undef DECLARE_CLASS
	}

	return pObj;
}

This means you don't need to manually update the enum and factory, you just have to update the single header file. However, it makes code that is much harder to read and understand, so there's a tradeoff there

--
Help me! I'm turning into a grapefruit!
Buzzwords!

problem with gethostbyaddr()

priyank_ldce1-Nov-06 2:15

priyank_ldce

1-Nov-06 2:15

Hi, I stuck with gethostbyaddr() function. When I try this function with IP add = 127.0.0.1 it gives me “WSANO_DATA (11004)” error. Now when I am using gethostbyname() function with name = localhost. It is working perfectly can I know what is the problem with this. Thanks in advance.
Priaynk

This is working

LPHOSTENT hostEntry;
hostEntry = gethostbyname("localhost");

This is not working

char* ipadd = "127.0.0.1";
LPHOSTENT hostEntry1;
hostEntry1 = gethostbyaddr(ipadd,4,AF_INET);

Re: problem with gethostbyaddr()

David Crow1-Nov-06 3:32

David Crow

1-Nov-06 3:32

priyank_ldce wrote:
hostEntry1 = gethostbyaddr(ipadd,4,AF_INET);

The first argument to gethostbyaddr() must be in network byte order (instead of host byte order). Use inet_addr().

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: problem with gethostbyaddr()

priyank_ldce1-Nov-06 6:05

priyank_ldce

1-Nov-06 6:05

DavidCrow wrote:
The first argument to gethostbyaddr() must be in network byte order (instead of host byte order). Use inet_addr().

Thanks for the reply. But inet_addr() function returns unsigned long value of IP address while the first parameter of gethostbyaddr() should be const char*. Can I know how can I use it in gethostbyaddr() function. I am new in C++ programming.

Re: problem with gethostbyaddr()

David Crow1-Nov-06 7:14

David Crow

1-Nov-06 7:14

priyank_ldce wrote:
Can I know how can I use it in gethostbyaddr() function.

ULONG ulAddress = inet_addr("127.0.0.1");
if (ulAddress != INADDR_NONE)
    pHostInfo = gethostbyaddr((char *) &ulAddress , sizeof(ulAddress), AF_INET);

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: problem with gethostbyaddr()

priyank_ldce1-Nov-06 22:39

priyank_ldce

1-Nov-06 22:39

Thanks for your help. it works. Big Grin | :-D

Listing Video Capture Devices

ceejeeb1-Nov-06 2:11

ceejeeb

1-Nov-06 2:11

For the life of me i cannot seem to be able to detect and produce a list of video capture devices connected to a computer. I am using directshow and i need to populate a combobox(IDC_COMBO1) in a dialog(IDD_PROPERTYDIALOG) with the device names.

Any help?

Re: Listing Video Capture Devices

Mark Salsbery1-Nov-06 6:08

Mark Salsbery

1-Nov-06 6:08

How are you detecting and producing the list? Filling the combo box should be the easy part Smile | :)

Are you having trouble getting the list or populating the combo box?

Are you using code like this to get the device list - Selecting a Capture Device[^]?

Re: Listing Video Capture Devices

ceejeeb2-Nov-06 2:41

ceejeeb

2-Nov-06 2:41

Ive sorted to problem now thanks for your help though Smile | :)

Change name Activex Control Project

Demian Panello1-Nov-06 1:33

Demian Panello

1-Nov-06 1:33

Hi.

Some years ago I wrote an ActiveX Control, (MFC), just a 3 state button. Now I want to add some new stuff to this old control, but I want to keep safe the old project, so I though to copy the project to a new folder and use that copy for the new project. But how could I change the name of the project to get a new activex control???.
The name of the old project is: "FlashButton" now I want to rename the copy of that project to "FlashButton2007" and add the new stuff here.

Thank you.

Demian.

"I have always wished that my computer would be as easy to use as my
telephone. My wish has come true. I no longer know how to use my telephone."
-Bjarne Stroustrup, computer science professor, designer of C++
programming language (1950- )

Re: Change name Activex Control Project

TClarke1-Nov-06 4:59

TClarke

1-Nov-06 4:59

Hi
Ther's a tool right here on CP. Fairly simple, it's just a string search and replace job. It's called vsrename.exe and it comes from an article titled "The Code Project - Visual Studio Project Renamer - Free Tools.htm"

Tom

PS make sure you back up your project fist though, as I said it is pretty simple.

How to access the instances of the counters of the Performance object from Perfmon

suresh_suryavanshi1-Nov-06 1:18

suresh_suryavanshi

1-Nov-06 1:18

Hi ...
Please tell me how to access the performance objects from perfmon. I am new to this.

I came to know that we can access the objects from the Provider classes. But please tell me how to access a single object i.e Pool NonPagedBytes.

Thanks in advance.

Suresh

SUresh

Re: How to access the instances of the counters of the Performance object from Perfmon

David Crow1-Nov-06 3:34

David Crow

1-Nov-06 3:34

suresh_suryavanshi wrote:
Please tell me how to access the performance objects from perfmon.

There are a few examples at the bottom (comments section) of this article.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: How to access the instances of the counters of the Performance object from Perfmon

suresh_suryavanshi2-Nov-06 3:20

suresh_suryavanshi

2-Nov-06 3:20

Hi DavidCrow,
I saw the example. But i am newbie for this. If possible give me the exact steps and which functions to use. i gone through the msdn library... now i am totally confused.

I want to access the PoolNonPagedBytes of Win32_PerfFormattedData_PerfProc_Process for only one process. Please suggest me the steps.

I am very greatful if u help me out to sort this problem.

Thanks in Advance.

Regards,
Suresh Frown | :(

Re: How to access the instances of the counters of the Performance object from Perfmon

David Crow2-Nov-06 4:47

David Crow

2-Nov-06 4:47

suresh_suryavanshi wrote:
If possible give me the exact steps and which functions to use.

I provided you with actual code. Short of hand-delivering it to you, what more do you want?

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

disable paint messages to a control

flippydeflippydebop1-Nov-06 0:31

flippydeflippydebop

1-Nov-06 0:31

hey there,

I would like to disable paint-updates to my tree control while i fill it with data using MFC, but cant
find the api to use.. can anybody help?

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