Re: Frequent open/close registry key? - C / C++ / MFC Discussion Boards

Jitendra gangwar29-Apr-04 1:33

29-Apr-04 1:33

That is all right.Thanks for correcting me.
The memory violation that you are facing may be due to that you are creating a local object.when you are creating the thread and passing the pointer of it. but after creation of thread, the control come back in the main function and the local object will got out of scope.still the thread is running and trying to access it by the pointer and cause the memory violation. if this is a problem then you can allocate the object by 'new' operator. so when you don't want it you can deallocate it manually.

Jitendra

how can i dynamically get my machine ip address ?

Marco M.28-Apr-04 6:17

Marco M.

28-Apr-04 6:17

i need to get the ip of the machine my code is running on..
how can i program that ?
thanx

shakoosh

Re: how can i dynamically get my machine ip address ?

David Crow28-Apr-04 7:03

David Crow

28-Apr-04 7:03

Call gethostname() followed by gethostbyname().

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: how can i dynamically get my machine ip address ?

toxcct28-Apr-04 7:09

toxcct

28-Apr-04 7:09

you can list all your IP Addresses by doing this :

<font style="color:blue;">struct</font> hostent* infohost;
<font style="color:blue;">char</font> HostName[256];
<font style="color:blue;">char</font>** addrs;
<font style="color:blue;">char</font>* Host;
 
gethostname(HostName, 255);
Host = HostName;
infohost = gethostbyname(HostName);
addrs = infohote -> h_addr_list;
<font style="color:blue;">while</font> (*addrs) {
    printf("IP : %s\n", inet_ntoa( *(struct in_addr *)* addrs));
    addrs++;
}

don't forget to check errors.
Your main IP Address while being in a TCP network is in general the first, but not necessarily...

TOXCCT >>> GEII power

Re: how can i dynamically get my machine ip address ?

RNEELY28-Apr-04 8:16

RNEELY

28-Apr-04 8:16

<br />
// GetMyManagedIP.cpp<br />
#include "stdafx.h"<br />
#using <mscorlib.dll><br />
#using <System.Windows.Forms.dll><br />
using namespace System;<br />
using namespace System::Windows::Forms;<br />
<br />
int _tmain(int argc, _TCHAR* argv[])<br />
{<br />
  String* hostName = SystemInformation::ComputerName;<br />
  System::Net::IPHostEntry* hostEntry = System::Net::Dns::GetHostByName(hostName);<br />
  Console::WriteLine(S"Host name : {0}", hostEntry->HostName);<br />
  for (System::Int32 i = 0; i < hostEntry->AddressList->Length; ++i)<br />
  {<br />
    Console::WriteLine(hostEntry->AddressList->Item[i]);<br />
  }<br />
  return 0;<br />
}<br />

Sincerely,
-Ron

Re: how can i dynamically get my machine ip address ?

RNEELY28-Apr-04 9:09

RNEELY

28-Apr-04 9:09

Or, if you don't like console output:

<br />
// GetMyManagedIP.cpp<br />
#include "stdafx.h"<br />
#using <mscorlib.dll><br />
#using <System.Windows.Forms.dll><br />
using namespace System;<br />
using namespace System::Windows::Forms;<br />
<br />
int _tmain(int argc, _TCHAR* argv[])<br />
{<br />
#pragma push_macro("new")<br />
#undef new<br />
  String* hostName = SystemInformation::ComputerName;<br />
  System::Net::IPHostEntry* hostEntry = System::Net::Dns::GetHostByName(hostName);<br />
  for (int i = 0; i < hostEntry->AddressList->Length; ++i)<br />
  {<br />
	Text::StringBuilder* sb = new Text::StringBuilder();<br />
	sb->Append(hostName);<br />
	sb->AppendFormat(S" IP Address {0} = ", __box(i));<br />
	sb->Append(hostEntry->AddressList->Item[i]->ToString());<br />
	MessageBox::Show(sb->ToString());<br />
  }<br />
  return 0;<br />
#pragma pop_macro("new")<br />
}<br />

Sincerely,
-Ron

Frequent open/close registry key?

Gibson_66628-Apr-04 5:48

Gibson_666

28-Apr-04 5:48

I got a question regarding storing of settings in the registry.
My application continously stores settings in the registry during runtime, before each value is saved I open the specific registry key and after the value is saved operation i close it.
This causes a frequent opening and closing of a specific registry key.
Is it more suitable for my application to open the registry key at start and to close the key whenever my application is due to shut down? Will there be somekind of vulnerability/benefit using this method, which one is prefered?

Re: Frequent open/close registry key?

David Crow28-Apr-04 7:10

David Crow

28-Apr-04 7:10

If you have a bunch of open/write/close calls, you might notice a small performance hit, if any, but you must weigh that against the registry cache not being flushed if your application were to terminate abnormally. The registry API does not necessarily write information to the registry immediately; it can take as much as several seconds for the cache to be flushed to the hard disk.

Microsoft Outlook hits the registry about once every 1-2 seconds, with a call to RegCloseKey() each time.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Web Browser

Moschous Manos28-Apr-04 5:28

Moschous Manos

28-Apr-04 5:28

Hi,

I am very new in windows programming but i want to do something to may be strange.
I want to build an application-Web Browser (or somehow extend the functionality of IE (plugin)) that in every request browser makes adding two additional headers.

for example: a request that makes IE is

GET http://www.google.com.gr/ HTTP/1.0
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-
powerpoint, application/vnd.ms-excel, application/msword, application/x-shockwav
e-flash, */*
Accept-Language: el
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.0.3705
; .NET CLR 1.1.4322)
Host: www.google.com.gr
Proxy-Connection: Keep-Alive

I want to add two more headers(at the end):

Profile: "http://139.91.70.5/index.html1","1-]Ό╓π╦^◄_ϊ~N<°;╪║"
Profile-Diff-1: <rdf xmlns="http://www.w3.org/TR/1999/PR
-rdf-syntax-19990105#" xmlns:prf="http://www.w3.org/TR/WD-profile-vocabulary#">
<description about="Hardware"> <modifications>

a)Can i change every request that IE makes enhance it with a plugin that doing that(adding the two headers)..?

b)Can i build an application from the scratch reusing the Web Browser Control (for the the HTML parsing and rendering of the sites) and enhance my_application with this functionality i describe above..?

c)I also saw in the MSDN documentation something about Winlnet (CHTTPSESSION), but i don't know if i can use such a think.(if i am able to use it, can i change the request that leaves from my client(adding the headers) and can i parse and render the html site that the server will return to my_client and present it properly?)

Does anybody knows anything else i can do..??

Please help me...

Thanks in advance!!!

Manos Moschous

MFC application with COM objects

Brian van der Beek28-Apr-04 5:01

Brian van der Beek

28-Apr-04 5:01

I have a MFC application with a COM interface. When I start the application via COM (i.e. a vbscript) its user interface is blocked until the call has returned. Is there any way to work around this problem?

Re: uint32 printing problem

Trollslayer28-Apr-04 5:00

Trollslayer

28-Apr-04 5:00

The 32 bit value is signed. Try casting it to unsigned.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Re: uint32 printing problem

roadragedave28-Apr-04 6:14

roadragedave

28-Apr-04 6:14

How do I do that????

We have a mathematician, a different kind of mathematician, and a statistician!

Re: uint32 printing problem

David Crow28-Apr-04 7:22

David Crow

28-Apr-04 7:22

No cast is necessary:

int i = 12345;
unsigned int ui = i;

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Plugin for VC++ that distributes the compiling across the network?

Gywox28-Apr-04 4:39

Gywox

28-Apr-04 4:39

The plugin´s name?

Quotation "I forgot the name of it, but there is a compiler plugin for VC++ that distributes the compiling across the network, so that build times are near zero, with only linking occuring at the requester. I recall hearing about game companies using it for their massive builds, diminishing hour long builds to less than a minute."

Gywox

CMDIChildWnd maximized

alex.barylski28-Apr-04 4:21

alex.barylski

28-Apr-04 4:21

I cannot remember how you make any new document inside an MDI app maximized by default...

I want the window to default to maximized state I do not want to set it to maximized state inside some function like:

CView::OnInitialUpdate() and call

CChildFrame* pFrame = (CChildFrame*)GetParentFrame();
pFrame->MDIMaximize();

All these techniques still cause serious flicker when opening new windows...or navigating...

Is this possible?

TIA

How do I print my voice mail?

Re: CMDIChildWnd maximized

Ryan Binns28-Apr-04 18:06

Ryan Binns

28-Apr-04 18:06

Override PreCreateWindow() in your child frame class and make sure cs.style includes WS_MAXIMIZE.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Posting messages in a SDI app

Trollslayer28-Apr-04 4:15

Trollslayer

28-Apr-04 4:15

There is a SDI app that I want to shut down after 1 second (it's a frame capture app).
I have tried PostMessage but haven't been able to figure it out yet.
Does anyone have a suggestion ?
Ta.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Re: Posting messages in a SDI app

Anonymous28-Apr-04 4:21

Anonymous

28-Apr-04 4:21

PostMessage(WM_CLOSE, 0, 0);

Re: Posting messages in a SDI app

Trollslayer28-Apr-04 4:57

Trollslayer

28-Apr-04 4:57

Yes, but where in the application, remembering that I will need to start a timer ?

The tigress is here Big Grin | :-D

Re: Posting messages in a SDI app

jmkhael28-Apr-04 5:02

jmkhael

28-Apr-04 5:02

Check Sleep
or call SetTimer, and you will receive a message WM_TIMER that you need to handle

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

ModifyStyle

Anthony988728-Apr-04 4:10

Anthony9887

28-Apr-04 4:10

I'm trying to modify the style(CBS_SORT) of a combo box control inside a dialog box at run time. Its seems its not updating? I added the ModifyStyle function inside the InitDialog of the Dialogbox. Is there something I'm missing?

Thanks

Re: ModifyStyle

includeh1028-Apr-04 5:55

includeh10

28-Apr-04 5:55

as i tested before, it can not be changed at runtime, may be i (and u) lost something.

my poor solution is:
use 2 combo-boxes, hide one and show one as requested.

includeh10

CreateInstance Fails…

anderslundsgard28-Apr-04 3:15

anderslundsgard

28-Apr-04 3:15

I’ve got a .dll from my supplier that I am trying to create a instance of. (I’m not realy good att dll’s).

How may I search for errors when my call to: CreateInstance(…) fails

I know it would return a HRESULT and that the value is 1 on those cpu-s which it don’t work on. The call work properly on my developing machine.

I surely have registered the dll on those cpu-s the call fails.

Pleased for any suggestions…

...and justice for all

APe

Re: CreateInstance Fails…

David Crow28-Apr-04 4:34

David Crow

28-Apr-04 4:34

d00_ape wrote:
I’ve got a .dll from my supplier...

Does the DLL's supplier have any suggestions?

d00_ape wrote:
I surely have registered the dll on those cpu-s the call fails.

What about any controls that the DLL uses that might need to be registered?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: CreateInstance Fails…

anderslundsgard28-Apr-04 20:15

anderslundsgard

28-Apr-04 20:15

The supplier is unfortunately not contactable in about three weeks…

I've checked dependencies using "Dependency Walker" and all seems OK.

...and justice for all

APe

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