Re: a question about the pointer of a function - C / C++ / MFC Discussion Boards

a question about the pointer of a function

Chen Jiadong25-Nov-01 18:14

25-Nov-01 18:14

hi, all.
i have a variable(named: "void vp" or "int vp"), it contains a function's address, now i plan to assign it to an function pointer(named: "void (*pFunc)()"), what can i do?(can't be like: "pFunc = vp", right?
thanks all. Smile | :)

Re: a question about the pointer of a function

Nish Nishant25-Nov-01 18:29

Nish Nishant

25-Nov-01 18:29

See this short program :-

#include <iostream.h>
void abc()
{
cout << "hello world\r\n";
}
void (*xyz)();
void main()
{
xyz=abc;
(*xyz)();
}

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Re: a question about the pointer of a function

Chen Jiadong25-Nov-01 21:30

Chen Jiadong

25-Nov-01 21:30

but actually i don't know the function name, and i just know its arguments, return type, and address.
Smile | :)

Re: a question about the pointer of a function

Nish Nishant25-Nov-01 21:53

Nish Nishant

25-Nov-01 21:53

okay,no probs

do this then

pFunction=(void(near*)())address;

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Re: a question about the pointer of a function

Chen Jiadong25-Nov-01 22:17

Chen Jiadong

25-Nov-01 22:17

it happens: "error C4226: nonstandard extension used : 'near' is an obsolete keyword"

Re: a question about the pointer of a function

Jon Hulatt25-Nov-01 22:26

Jon Hulatt

25-Nov-01 22:26

use "far" instead.

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: a question about the pointer of a function

Nish Nishant25-Nov-01 22:29

Nish Nishant

25-Nov-01 22:29

hehehe
sorry
I still have memory-left-overs from the DOS days

try the following instead :-

#include "stdafx.h"

void (*pFunc)();

int main(int argc, char* argv[])
{
	pFunc=(void(__cdecl*)())0xffff0000;
	return 0;
}

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Re: a question about the pointer of a function

Chen Jiadong25-Nov-01 22:38

Chen Jiadong

25-Nov-01 22:38

Oooooook, just "pFunc = (void(*)())address" is ok.
thank you very very much, thank you all, especially thank you Busterboy.
Smile | :)

Are Compound Files always so big?

longwalk25-Nov-01 17:17

longwalk

25-Nov-01 17:17

I am doing some jobs as to store records like information into files. I've try the Compound File implementation of the Structured Storage, but the result files seems always too big for me, even one empty file costs about 2.5k! I like the way that the Compound File acts but the file size also means a lot to me. What should I do then?

Re: Are Compound Files always so big?

Rob Caldecott25-Nov-01 23:47

Rob Caldecott

25-Nov-01 23:47

Avoid structured storage - not only are the files big, but the performance is terrible. I tried using SS for an app that needed to store lots of small files in a single large file and the performance really sucked!

how to hide the taskbar programmatically?

haiyan_qi25-Nov-01 16:48

haiyan_qi

25-Nov-01 16:48

when the users maximized my window,i want the window cover the Windows' taskbar,how to do it?thanks Eek! | :eek:

Re: how to hide the taskbar programmatically?

Nish Nishant25-Nov-01 17:44

Nish Nishant

25-Nov-01 17:44

Try this code out :-

HWND hTBar=::FindWindow("Shell_traywnd","");
::ShowWindow(hTBar,SW_HIDE);
AfxMessageBox("hidden");
::ShowWindow(hTBar,SW_SHOW);

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Re: how to hide the taskbar programmatically?

haiyan_qi25-Nov-01 20:45

haiyan_qi

25-Nov-01 20:45

thanks,i really appreciate it.
but just hide the taskbar seems a little terrible.my users would be surprised if they couldn't find the taskbar when minimized the window.
what i want is just to hide the taskbar behind the window when users maximized the window,i mean just let the window cover the taskbar,but not really disappear the taskbar from the screen.
can you help me?

Re: how to hide the taskbar programmatically?

Bernhard26-Nov-01 0:03

Bernhard

26-Nov-01 0:03

ON_WM_ACTIVATE:
if (activate & fullsize)
hide_taskbar
else
show taskbar

think this should work..

bernhard

"There are three roads to ruin: women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians." Georges Pompidou

Reading raw data

RobJones25-Nov-01 16:39

RobJones

25-Nov-01 16:39

Hello,
I am trying to read the last 128 bytes of a compressed file(MP3)... How can I extract the last 128 bytes and display this information in a CString.. I am using CFile to open the mp3 and dumping the entire contents into a char.. I then dump that into a CString.. but the format is all wrong. Can anyone give me some pointers on how to dump the last 128 bytes of a file into a CString? If I open the file in notepad and scroll to the bottom.. I can see the information I'm trying to extract.

Thanks,

Rob

Re: Reading raw data

Michael Dunn25-Nov-01 17:31

Michael Dunn

25-Nov-01 17:31

A CString is the wrong thing to use. I assume you're looking for an ID3v1 tag? The tag can have embedded 0 bytes, or the tag might not even be present. Use an array of 128 BYTEs instead and parse it manually. See this shell extension article where I do exactly this.

--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
Heart | [heart]

your

with

and

Sonork - 100.10414 AcidHelm

Re: Reading raw data

RobJones25-Nov-01 18:29

RobJones

25-Nov-01 18:29

Thanks Mike!! Thats exactly what I'm trying to do. I'll give it a look in the morning.

Thanks again

Rob

Unicode version of strlen

Matt Newman25-Nov-01 15:34

Matt Newman

25-Nov-01 15:34

I am converting a class to unicode and got all of it but a single instance of strlen. What should I use instead?

-Matt Newman
-Matt Newman

Re: Unicode version of strlen

Nish Nishant25-Nov-01 16:23

Nish Nishant

25-Nov-01 16:23

Not sure, but what about wcslen?

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Re: Unicode version of strlen

Matt Newman25-Nov-01 16:34

Matt Newman

25-Nov-01 16:34

Yep it worked. Thanks.

-Matt Newman
-Matt Newman

Re: Unicode version of strlen

PJ Arends25-Nov-01 19:04

PJ Arends

25-Nov-01 19:04

Why not use the tchar macros, that way your code will work with SBCS, MBCS and UNICODE. The tchar macro for strlen is _tcslen().

---
It may be that your sole purpose in life is simply to serve as a warning to others.

How to delete a Class

Steve L.25-Nov-01 11:57

Steve L.

25-Nov-01 11:57

To delete a class what I do is i go to the File View and I delete the .cpp and .h files of my class. If i go to the class wizard the class can not be found so it looks right. However, if i try to create a class of the same name of the class i just deleted it calls it class1 as opposed to just class. What i have to do is go to windows explorer and delete the .cpp and .h files which i thought i had already deleted. Then i goto the class wizard and it says something like can not find class then it asks me if it wants me to delete it. This doesn's seem like the right way to delete a class. Is it?

<marquee>click -> A Sign of Boredom <- click

Re: How to delete a Class

Christian Graus25-Nov-01 12:43

Christian Graus

25-Nov-01 12:43

VC has removed the files from the project, but not your hard drive. So go to the directory and delete the old class ( the filename won't have the leading 'C' in it ), and then start again.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: How to delete a Class

25-Nov-01 13:41

One way to delete a class created by classwizard in V6.0:

Say, your class is Cabc.

Delete the abc.h and abc.cpp file in the FileView .
Delete the abc.h and abc.cpp file using the windows explorer.
Do a string search on 'abc' using 'Find in files' and click on the line containing 'abc' and '.clw' in the output window to open class wizard in the editor.

Double click on the line containing the string '.clw' in the output window.

Find the references like the following for 'abc' and delete those lines.
[CLS:Cabc]
Type=0
HeaderFile=abc.h
ImplementationFile=abcr.cpp
BaseClass=CWinThread
Filter=N
LastObject=Cabc

Also, find out the part of the .clw file as below and change the class
count number to 1 less. Delete the line containing 'Class3=Cabc'.

ClassCount=3
Class1=CMyAppApp
Class2=CMyAppDlg
Class3=Cabc

At times 'Class3=Cab' may not be with the other classes as below:
(It is a good idea to have them together.)

ClassCount=3
Class1=CMyAppApp
Class2=CMyappDlg

ResourceCount=2
Resource1=IDR_MAINFRAME
Class3=Cabc
Resource2=IDD_MYAPP_DIALOG

Finally it will be something as below:

ClassCount=2
Class1=CMyAppApp
Class2=CMyAppDlg

ResourceCount=2
Resource1=IDR_MAINFRAME
Resource2=IDD_MYAPP_DIALOG

Click on the file menu and click on save.

close the .clw window (do not forget to do this).

It is a good idea to close the workspace and start again.

Re: How to delete a Class

Christian Graus25-Nov-01 15:35

Christian Graus

25-Nov-01 15:35

Gosh that's a whole lot of work. Why not delete the .clw file and let VC regenerate it ?

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

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