Re: Tricky C++ question - C / C++ / MFC Discussion Boards

YaronNir29-Oct-03 22:57

29-Oct-03 22:57

Hi all,

I want to declare on a method that one of its parameter is a pointer to a function. the function is not the same for each call, meaning it can get different parameters each time..... i know i need to use the 3 dots to define the undetermined parameters....

touble is i am not familier with the syntax of either cases.....

can any1 help plz?

thanks in advanced

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: Tricky C++ question

Ian Darling29-Oct-03 23:10

Ian Darling

29-Oct-03 23:10

This sounds like a job for function objects.

What you do is define a class and implement a standard function that can be called (usually operator()). Then you can pass the parameters to an instance of your class in the constructor, pass the object to your method, and then call the standard function from within the method.

This article seems to be a reasonable pointer in the right direction:

http://www.informit.com/isapi/guide~cplusplus/seq_id~135/guide/content.asp[^]

HTH

--
Ian Darling
"The moral of the story is that with a contrived example, you can prove anything." - Joel Spolsky

Re: Tricky C++ question

YaronNir29-Oct-03 23:12

YaronNir

29-Oct-03 23:12

tons of thanks! Big Grin | :-D

cheers

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: Tricky C++ question

Juan Antonio Bermejo29-Oct-03 23:19

Juan Antonio Bermejo

29-Oct-03 23:19

Try something like...

typedef void (* TFunction)(int param1, ...);

void MyFunction(TFunction pF)
{
pF(90, 30, 20, 10);
};

Best regards
jAB

Re: Tricky C++ question

YaronNir29-Oct-03 23:23

YaronNir

29-Oct-03 23:23

thanks man,

that's really helpfull

cheers

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: Tricky C++ question

YaronNir29-Oct-03 23:26

YaronNir

29-Oct-03 23:26

an other question please...

what is the syntax for calling the MyFunction?? what do i pass as parameter for TFunction PF??? can u show me code

thanks

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: Tricky C++ question

Juan Antonio Bermejo29-Oct-03 23:32

Juan Antonio Bermejo

29-Oct-03 23:32

Here is the whole code...

typedef void (* TFunction)(int param1, ...);

void MyFunction(TFunction pF)
{
pF(90, 30, 20, 10);
};

void OtherFunction(int param1, ...)
{
// Do something
}

// Calling...
...
MyFunction(OtherFunction);
...

Re: Tricky C++ question

YaronNir29-Oct-03 23:38

YaronNir

29-Oct-03 23:38

thanks..

c code is a little misunderstood for me... i will describe the problem i have in c++ maybe you can write the proper example code :

the class CBDRMainDlg contains the called method :

class CBDRMainDlg
{
public
.
.
void ClearIt(); // the method that will be called
};

the class also contains a function called add that one of its parameters is a pointer to the method ClearIt:

class CBDRMainDlg
{
public
  void Add( // here should be the declaration of the pointer to a function);
.
.
void ClearIt(); // the method that will be called
};

out side the class in on other class i am defining an object of the class:

...
...
CBDRMainDlg dlg;
// here is where i want to call the add function with the pointer to 
// ClearIt as the first parameter

dlg.DoModal();

see all the remarks above, can u replace them with the proper code?

thanks again for all your help

Cheers
Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: Tricky C++ question

Juan Antonio Bermejo30-Oct-03 21:21

Juan Antonio Bermejo

30-Oct-03 21:21

This is sintactically correct:

class CBDRMainDlg;

typedef void (CBDRMainDlg::* DlgMethod)(void);

class CBDRMainDlg
{

public:
void Add(DlgMethod method)
{

};
void ClearIt()
{
printf("Clear It");
};
};

int main(int argc, char* argv[])
{
CBDRMainDlg dlg;

dlg.Add(CBDRMainDlg::ClearIt);

return 0;
}

... but i can't figure out how to call the method inside 'Add' since the compiler needs to push the this pointer in the stack before make the calling. It is possible using inline asm but i think that is not the best solution...

Why do you want to call methods this way? I think you can do that using virtual methods...

SysIPAddress32 in VC++ 5.0

Phil.Benson29-Oct-03 22:44

Phil.Benson

29-Oct-03 22:44

I have a problem, I´m trying to use the IP address control in a VC++ 5.0 project. The code should be ok, but, when the resources are to be compiled, it does not recognise the SysIPAddress32 control.

Does anybody have a solution for this, i.e. do I have to set the control (in the resource editor) as a custom control, and if yes, how?

Thanks in advance

Phil

bum... and I thought I´d got rid of all the bugs Frown | :(

Re: SysIPAddress32 in VC++ 5.0

saarfu15-Dec-09 4:51

saarfu

15-Dec-09 4:51

HI,
are you able tyo create CIPAddressCtrl

and use ??
please help me if you can
thanks
sarfu

Re: SysIPAddress32 in VC++ 5.0

Phil.Benson15-Dec-09 5:26

Phil.Benson

15-Dec-09 5:26

Sorry, but if you look at the date, this is over 6 years ago, and for the life of me I can't remember how I got it to work... I've moved onto "Greener Pastures" now Wink | ;-)

Cheers
Phil

Who the f*** is General Failure, and why is he reading my harddisk?

IHTMLDOMNode appendChild return E_INVALIDARG

ShayAmar29-Oct-03 21:50

ShayAmar

29-Oct-03 21:50

Hi,

I need some help please.
I tried to figure it out, but with no success so far.
Why do I get E_INVALIDARG when I try to use the appendChild Function.
This is my source code:

IHTMLElement* pHTMLElement;
IHTMLElement* pNewHTMLElement;
IHTMLDOMNode* pHTMLDOMNode;
IHTMLDOMNode* pNewHTMLDOMNode;
IHTMLDOMNode* pNew2HTMLDOMNode;
IDispatch* pDisp;

v.vt = VT_BSTR;
v.bstrVal = SysAllocString(L"HEAD");

hResult = pIHTMLElementCollection->tags(v,&pDisp );

if (hResult == S_OK)

{
hResult = pDisp->QueryInterface(IID_IHTMLElementCollection,(void**)&pIHTMLElementCollection);
if (hResult == S_OK)
{
pIHTMLElementCollection->get_length(&lCollectionSize);

v.vt = VT_I4;
v.lVal = 0;

hResult = pIHTMLElementCollection->item(v,v,&pDisp);

if (hResult == S_OK && pDisp != NULL)
{
hResult = pDisp->QueryInterface(IID_IHTMLElement,(void**)&pHTMLElement);
if (hResult == S_OK)
{
hResult = pHTMLElement->QueryInterfa(IID_IHTMLDOMNode,(void**)&pHTMLDOMNode);

if (hResult == S_OK)
{
bstrTemp = SysAllocString(L"BASE");
hResult = pIHTMLDocument2->createElement(bstrTemp, &pNewHTMLElement);
SysFreeString(bstrTemp);

if (hResult == S_OK)
{
bstrTemp = SysAllocString(L"href");
v.vt = VT_BSTR;
v.bstrVal = strWebPageDomain.GetBuffer();

hResult = pNewHTMLElement->setAttribute(bstrTemp, v, 0);

SysFreeString(bstrTemp);

if (hResult == S_OK)
{
hResult = pNewHTMLElement->QueryInterface(IID_IHTMLDOMNode,(void**)&pNewHTMLDOMNode);
if (hResult == S_OK)
{

****************************************************************************
hResult = pHTMLDOMNode->appendChild(pNewHTMLDOMNode, &pNew2HTMLDOMNode);

****************************************************************************
}
}

}
}
}
}
}
}
}
}

Add Attachment with Outlook2000 Automation

NaturalBornChilla29-Oct-03 21:08

NaturalBornChilla

29-Oct-03 21:08

Good morning,
I have a problem with adding an file to a mail.
This process should use OLE Automation. I already figured out all the other things, but I'm not able to do that...
I also found no help in the msdn library, so you out there are my last chance...

Thanks in advance.

Manipulating File Open/Save Filters

Sreeramachandra29-Oct-03 20:34

Sreeramachandra

29-Oct-03 20:34

Hi there,

I have created a MDI Application which has two view(one derived from CEditView and other with CView) and get the data from one Document. No my problem is that i have used the method for Open/Save Filters using the article in this site and when i open the txt it is opening CEditView but the problem is that it is not opening the contents in the file. How to solve this problem if anybody knows plz reply me fast.

Sreeramachandra G

finding the IOCTRL for a Driver

Fad B29-Oct-03 20:14

Fad B

29-Oct-03 20:14

Hi Any one can help me in finding the IOCTRL for a Driver for a special Hardware. because I need to communicate with the driver in Kernel Mode not in user mode , and this Hardware have an interface via dll and the dll connect to the driver
Thanks for any help
Fadi

Rose | [Rose]

Re: finding the IOCTRL for a Driver

Alexander ^M.,30-Oct-03 2:37

Alexander ^M.,

30-Oct-03 2:37

oh, hi fadi Wink | ;)

there are some types of IOCTLs, the standard ones and the custom ones.
to find out the standard ones, read the DDK and/or the DDK header files.
the custom ones are a problem...

good luck,
alex

Don't try it, just do it! Wink | ;-)

Can anyone spot my mistake?

georgiek5029-Oct-03 19:06

georgiek50

29-Oct-03 19:06

<br />
szBuffer[0] = '\0';<br />
<br />
strncpy(szBuffer, cMediaFileInfo.szFrameRate, strlen(cMediaFileInfo.szFrameRate) - 4);<br />
<br />
// szFrameRate is "25.000 fps" (without quotes)<br />
				<br />
szBuffer[strlen(cMediaFileInfo.szFrameRate) - 4] = '\0';<br />
double dFramerate = atof(szBuffer);<br />

dFramerate is always 0.

Re: Can anyone spot my mistake?

Michael Dunn29-Oct-03 19:11

Michael Dunn

29-Oct-03 19:11

Any reason you don't do it a simpler way? --
atof ( cMediaFileInfo.szFrameRate );

--Mike--
Ericahist [updated Oct 26] | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber
If my rhyme was a drug, I'd sell it by the gram.

Re: Can anyone spot my mistake?

Chris Meech30-Oct-03 3:01

Chris Meech

30-Oct-03 3:01

Your code snippet does not show the allocation for szBuffer. Are you show it is at least as large as say 6 or more bytes?

Chris Meech

It's much easier to get rich telling people what they want to hear. Chistopher Duncan

But for a man, barbecuing eggplant and portobello mushrooms is a sure way to have people question your sexual orientation. Kuro5hin

Why download html page fail sometimes? I use CHtmlview(vc 6.0)

5200131429-Oct-03 18:58

52001314

29-Oct-03 18:58

I used CHtmlView to display html page.

And I create a new thread as my work thread.

In my work thread , I call m_pMyHtmlView->Navigate2(...) to navigate to a html page.

The problem is when my program runs,the downloadComplete isn't be done sometime. And the URL I open is the file in the local computer with my program. So I don't know why the download is fail?

I try to debug it,and find the function run like under:
OnBeforeNavigate2()
DownloadBegin()
DownloadComplete()
DownloadBegin()
-------------------if error happens,the under don't be done
OnTitleChange
NavigateComplete()
DownloadComplete()
OnTitleChange
DocumentComplete()

Why after execute DownloadBegin() not execute DownloadComplete()?

Does anybody meet the status like this?

The error doesn't happen every time.Sometimes it happens after program runs 5 minutes. Some time the program work well whole day.

When the error happens,the thread of CHtmlView doesn't work.Even if the work thread call's m_pmyHtmlView->Navigate2(...),the thread of CHtmlView does't respond.It seems that thread was blocked.

Object-Oriented Classes HELP

bwestend29-Oct-03 17:38

bwestend

29-Oct-03 17:38

Design the necessary classes for a program that would allow a state government office to track vehicle registrations/license plates. The program should at least allow tracking of the Registrant, the Vehicle, and the Registration Details including fees paid.

What are 4-7 classes I could use to write this program?

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!

bwestend29-Oct-03 17:39

bwestend

29-Oct-03 17:39

i need help.

Re: Object-Oriented Classes HELP

Michael Dunn29-Oct-03 19:08

Michael Dunn

29-Oct-03 19:08

We aren't here to do your homework for you. From the FAQ:

It is generally OK to ask questions about a homework assignment, but you must at least try on your own first. Don't just post the assignment description; that looks like you want the forum readers to do the assignment for you. Start the program yourself, and when you get stuck, ask a specific question and, again, include the code that isn't working.

--Mike--
Ericahist [updated Oct 26] | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber
#include "witty-quote.h"

Re: Object-Oriented Classes HELP

bwestend29-Oct-03 19:41

bwestend

29-Oct-03 19:41

GEE THANKS..... too bad i did start it myself and i was asking for some help to see what response I would get. I was stuck and confused about what classes to use and thats why I asked the question. How else would anyone know what to write back if I didnt include the problem. Thanks there smart guy.

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