C / C++ / MFC Discussion Boards

C^hris L^osinger25-Mar-03 3:50

25-Mar-03 3:50

class Foo
{
public:
  void Blah();
  
  static void Blech()
  {
     Foo f;
     f.Blah();
  }
};

-c

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Re: static and non-static function

Ravi Bhavnani25-Mar-03 4:26

Ravi Bhavnani

25-Mar-03 4:26

A static method doesn't have a this reference. Hence, it can only call other static methods of its class. However, if the static method has access to an instance of a class, it can call that instance's static or non-static method.

class Foo {
  ...
  public:
    static void staticFuncA();
    static void staticFuncB();
    void nonStaticFunc();
}
 
void Foo::staticFuncA()
{
  staticFuncB();      // OK
  nonStaticFunc();    // invalid, since no "this" reference
 
  Foo f;
  f.nonStaticFunc();  // OK
}

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: static and non-static function

Brigsoft25-Mar-03 7:58

Brigsoft

25-Mar-03 7:58

1)Yes, if I pass to the function object of its class.
2) By a same way.

================================
Useful links

Duplicate Menu..

Brian Shifrin25-Mar-03 2:51

Brian Shifrin

25-Mar-03 2:51

Anyone has handy library fuction to copy CMenu or HMENU???

Thanks,
Brian

P.S.
I know how, just to lazy to iterate menues & submenus & states...

Re: Duplicate Menu..

lucy25-Mar-03 4:12

lucy

25-Mar-03 4:12

do you mean the resource?

If so, open the *.rc file which contains the menu resource you want in visual studio while the destination project is opened. click on the resource ID, drag it to your destination project. That's it.

Re: Duplicate Menu..

Brian Shifrin25-Mar-03 4:34

Brian Shifrin

25-Mar-03 4:34

>do you mean the resource?

Nope

Dynamic CMenu/HMENU....

Re: Duplicate Menu..

John R. Shaw28-Mar-03 18:29

John R. Shaw

28-Mar-03 18:29

No, but could you be more specific.

Trust in the code Luke. Yea right!

Check for existance of an application.

Neha25-Mar-03 1:58

Neha

25-Mar-03 1:58

Hi,

I have a application which doesn't have proper window name
and class name(Class name will be #32770(Dialog) and Window name was "").So i can't use FindWindow(). Application is a third party application,about which we don't have much information. Now i want to check for existance of that application. How can i do that?

Regards

Re: Check for existance of an application.

567890123425-Mar-03 4:14

5678901234

25-Mar-03 4:14

If you have the name of application exe file, you can find it using the following functions:
EnumProcesses

For each enumerated process

OpenProcess
EnumProcessModules
GetModuleFileNameEx

Reading Hard Disk at hardware-level

Anonymous25-Mar-03 1:48

Anonymous

25-Mar-03 1:48

Hi
How do you read bytes from the harddisk using Visual C++ 6.0? (Used for reading filesystems)

I know you can use _bios_disk() with the bios.h include, but VC++ doesn't have this file or it's functionality. Is there another way to do it in windows, without using assembler?

Cheers

Re: Reading Hard Disk at hardware-level

Daniel Turini25-Mar-03 3:06

Daniel Turini

25-Mar-03 3:06

You can call DeviceIoControl API function.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devio/base/calling_deviceiocontrol.asp[^]

Be careful.
Backup your data first.

It's not the fall that kills you: it's the sudden stop - Down by Law, Jim Jamursch (1986)

Re: Reading Hard Disk at hardware-level

John M. Drescher25-Mar-03 5:41

John M. Drescher

25-Mar-03 5:41

Anonymous wrote:
I know you can use _bios_disk()

You can only do this in winodows 9X or lower. Win NT, 2k or XP will not allow this because you cannot access the bios interrupts directly.

John

Re: Reading Hard Disk at hardware-level

John R. Shaw28-Mar-03 18:42

John R. Shaw

28-Mar-03 18:42

Be more specific. What is your goal? As for using the bios and asymbly, that is why we have so many versions of 9.x (direct access without security).

Trust in the code Luke. Yea right!

Bits and bytes handling

emrosa25-Mar-03 0:39

emrosa

25-Mar-03 0:39

Hi there...I'm writing a program that will work at bits/byte level. It will accept a double number as an argument, and then the number will be decomposed in two parts: the high and the low, I'm going to do some operations with them.

I know about the bitwise operators, but Is anyboady know how to make the decomposition

double FUNCTION(double argument)
{
int hx,lx
//MISSING THIS PART!!!!
hx = HIGH_PART(argument);
lx = LOW_PART(argument);
//other operations with hx and lx
//
return(final_result)
}

Eric Manuel Rosales Pena Alfaro
PhD student
Unversity of Essex
Wivenhoe Park
Colchester, CO4 3SQ
Essex, Uk
email: emrosa@essex.ac.uk
tel: +44-01206-87311

Re: Bits and bytes handling

jhwurmbach25-Mar-03 1:08

jhwurmbach

25-Mar-03 1:08

emrosa wrote:
...bits/byte level...double...

Do you perchance talk about DWORD?
Or do you really mean double, the extended precision floating point type?

In case of DWORD, have a look at the HIWORD and LOWORD macros in MSDN.

My opinions may have changed, but not the fact that I am right.

Re: Bits and bytes handling

Roger Allen25-Mar-03 2:02

Roger Allen

25-Mar-03 2:02

Why not use a standra C union:

union Converter
{
 {
 short low;
 short high;
 }
 double value;
};

Converter x;

x.value = 5.67;
short low = x.low;
short high = x.high;

My uinion syntax may not be correct as I have not sed them for years n years n years....

Roger Allen
Sonork 100.10016

Were you different as a kid? Did you ever say "Ooohhh, shiny red" even once? - Paul Watson 11-February-2003

Re: Bits and bytes handling

emrosa25-Mar-03 2:26

emrosa

25-Mar-03 2:26

Thanks for the hint...I have already tried that and it works fine.

Thanks again

Eric Manuel Rosales Pena Alfaro
PhD student
Unversity of Essex
Wivenhoe Park
Colchester, CO4 3SQ
Essex, Uk
email: emrosa@essex.ac.uk
tel: +44-01206-87311

Re: Bits and bytes handling

John R. Shaw28-Mar-03 18:58

John R. Shaw

28-Mar-03 18:58

Your kiding me, that actualy worked? Please explane why.

From MSDN:
Type double
Double precision values with double type have 8 bytes. The format is similar to the float format except that it has an 11-bit excess-1023 exponent and a 52-bit mantissa, plus the implied high-order 1 bit. This format gives a range of approximately 1.7E–308 to 1.7E+308 for type double.

Microsoft Specific —>

The double type contains 64 bits: 1 for sign, 11 for the exponent, and 52 for the mantissa. Its range is +/–1.7E308 with at least 15 digits of precision.

END Microsoft Specific

Ok I probubly just broke the law. But I need to know.

How hide Main Menu

jeremysay24-Mar-03 23:56

jeremysay

24-Mar-03 23:56

Hello,
in MDI project,i want to hide the main menu (IDR_MAINFRAME) when i press F11 and show the menu when a press F12 , i already try
SetMenu(NULL) to hide it, and it works, but i don't know how to show the menu ? Confused | :confused:

help please
thx in advance

Re: How hide Main Menu

Simon.W25-Mar-03 0:31

Simon.W

25-Mar-03 0:31

CMenu *pMenuOid = SetMenu(NULL);
//............................
//restore it!
SetMenu(pMenuOld);

I am seeking...
For what?
Why did you ask me for what? I don't know!

Re: How hide Main Menu

jeremysay25-Mar-03 2:06

jeremysay

25-Mar-03 2:06

thx
but it don't works, SetMenu(NULL) return a BOOL and not a CMenu.
i try
CMenu *pMenuOid = GetMenu(NULL);
SetMenu(NULL)

and to restore it :
SetMenu(pMenuOid);

but when i restore i have a Error message (Debug Assertion failed)

Cstring

wow999924-Mar-03 23:42

wow9999

24-Mar-03 23:42

Dear all

i will like to use a loop and CString.Find method to find a string from a text file.

Example-----
Object 0:
aaaaaaaaaa
Object 1:
bbbbbbbbbbb
Object 2:
ccccccccccc
Object 3:
dddddddddd

for(int i=0;i<3;i++)
{
xxx.Find("Object [i]:");
}

Can someone tell me how to code the integer part,[i], in Find method.

Re: Cstring

Christian Graus24-Mar-03 23:48

Christian Graus

24-Mar-03 23:48

With a second CString and CString.Format.

Christian

NO MATTER HOW MUCH BIG IS THE WORD SIZE ,THE DATA MUCT BE TRANSPORTED INTO THE CPU. - Vinod Sharma

Anonymous wrote:
OK. I read a c++ book. Or...a bit of it anyway. I'm sick of that evil looking console window.

I think you are a good candidate for Visual Basic. - Nemanja Trifunovic

Re: Cstring

Rage25-Mar-03 0:04

Rage

25-Mar-03 0:04

CString str;
for(int i=0;i<3;i++)
{
str.Format("Object %i",i);
xxx.Find(str);
}

~RaGE();

CreateProcess strange behaviour?!

Enis24-Mar-03 23:28

Enis

24-Mar-03 23:28

Hello all!
Here is some "strange" behaviour of CreateProcess (or winword, I don't know)
I wanted to launch winword from my application and be notified when the user close the session I opened, so I used CreateProcess and WaitForSingleObject.
Here is the code sample from MSDN:

<br />
SECURITY_ATTRIBUTES sec;<br />
sec.bInheritHandle = FALSE;<br />
sec.lpSecurityDescriptor = NULL;<br />
sec.nLength = sizeof(SECURITY_ATTRIBUTES);<br />
<br />
STARTUPINFO si;<br />
::ZeroMemory(&si, sizeof(STARTUPINFO));<br />
si.cb = sizeof(STARTUPINFO);<br />
PROCESS_INFORMATION pi;<br />
<br />
//notice the 2 slashes after winword.exe<br />
if(::CreateProcess(NULL, <br />
  "C:\\Program Files\\Microsoft Office\\Office\\winword.exe / / C:\\STPMesagElec.doc", NULL,NULL, TRUE, NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi)) <br />
{<br />
  // Wait for Word to become Idle.<br />
  WaitForInputIdle(pi.hProcess, 3000);<br />
  WaitForSingleObject(pi.hProcess,INFINITE);<br />
}<br />
else {<br />
  int err = GetLastError();<br />
  ::MessageBeep(0);<br />
  ::MessageBox(NULL, "CreateProcess() failed.\nCheck Path for WinWord.Exe.",<br />
"Error", MB_SETFOREGROUND);<br />
<br />
  return;<br />
}<br />
<br />
::CloseHandle(pi.hThread);<br />
::CloseHandle(pi.hProcess);<br />

Now, the result:
- If I use CreateProcess as above, but without the 2 slashes, it works only when there is no other instance of Word already opened; if a session already exists, WaitForSingleObject doesn't block anymore
- If I use CreateProcess with the two slashes, it works just as I need it.

I noticed that with at least one of the slashes, CreateProcess creates a new instance of winword.exe, else it opens a new document in the already existing process.

Also, with other applications (eg Notepad or even Excel), it works fine without the slashes.

Do you think that this is abnormal behaviour?
Why it needs the slashes? (i discovered this by pure luck, it isn't documented anywhere)

Enis Arif
-----------

"I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world." (Albert Einstein)

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