C / C++ / MFC

Re: Arguments from different functions to a single function.

11-Nov-07 22:22

Hmm. Since this is a C++ forum I am going to assume you are using C++. Here's one way of doing it:

void functionOne( int x, int y, int& a, int& b )
{
  // do some work and initialize "a" and "b"
}

void functionTwo( double& dd )
{
  // do some work and initialize "dd"
}

void mainCal( int i, int j, double k )
{
  functionOne( 1, 2, i, j );
  functionTwo( k );
}

The key thing to note here is that a, b and dd are passed by reference to functionOne and functionTwo.

-- modified at 4:34 Monday 12th November, 2007
Fixed typo where only 2 params where supplied to functionOne when it expects 4.

--
gleat
http://blogorama.nerdworks.in[^]
--

CodingLover11-Nov-07 22:27

Re: Arguments from different functions to a single function.

11-Nov-07 22:27

That's make sense to me, thanks.

But I have one question. I want to use x, y and dd inside the mainCal(). here,

gleat wrote:
void functionOne( int x, int y, int& a, int& b )
{
// do some work and initialize "a" and "b"
}

you have use two reference, and that's clear to me. Then I want to call mainCal() there and send x and y. So what you have done here,

gleat wrote:
void mainCal( int i, int j, double k )
{
functionOne( i, j );
functionTwo( k );
}

is not clear for me....

I appreciate your help all the time...
Eranga Smile | :)

Rajasekharan Vengalil11-Nov-07 22:33

Re: Arguments from different functions to a single function.

11-Nov-07 22:33

Sorry. My bad! I assumed that x and y were inputs to functionOne and then forgot to supply those parameters when calling it! If you do not have any other input arguments you can drop those, i.e., you could something like this:

void functionOne( int& a, int& b )
{
  // do some work and initialize "a" and "b"
}

void functionTwo( double& dd )
{
  // do some work and initialize "dd"
}

void mainCal( int i, int j, double k )
{
  functionOne( i, j );
  functionTwo( k );
}

--
gleat
http://blogorama.nerdworks.in[^]
--

CodingLover11-Nov-07 22:45

Re: Arguments from different functions to a single function.

11-Nov-07 22:45

But pal, I've confusing on this also Frown | :(

gleat wrote:
functionOne( i, j );

Can't I call the mainCal() inside the functionOne() as, mainCal(a, b)

I appreciate your help all the time...
Eranga Smile | :)

Rajasekharan Vengalil11-Nov-07 22:52

Re: Arguments from different functions to a single function.

11-Nov-07 22:52

You can call any function from any other function. The point is to understand the use of passing parameters by reference. If you have a function declared like so for instance:

void foo( int& a )
{
 a = 10;
}

And you called it like so from somewhere:

int i;
foo( i );
cout<<i<<endl;

It'd print 10. See here[^] for more information.

--
gleat
http://blogorama.nerdworks.in[^]
--

CodingLover11-Nov-07 23:09

Re: Arguments from different functions to a single function.

11-Nov-07 23:09

Ok, I got it. Thanks for the link as well.

I appreciate your help all the time...
Eranga Smile | :)

Rajesh R Subramanian11-Nov-07 22:23

Rajesh R Subramanian

11-Nov-07 22:23

It doesn't look like you are using x, y and dd in minCal(). But is that just what you want? Why can't you simply use global variables? ...if only I understood your question right...

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->ßRÅhmmÃ<-·´¯`·.

Re: Arguments from different functions to a single function.

CodingLover11-Nov-07 22:31

Re: Arguments from different functions to a single function.

11-Nov-07 22:31

brahmma wrote:
It doesn't look like you are using x, y and dd in minCal(). But is that just what you want?

Exactly that is what I want to do is..

brahmma wrote:
Why can't you simply use global variables?

Actually this is a iterative process. I mean first sends some data to functionOne() and functionTwo(), and do calculations and those values need to use inside the mainCal().

I appreciate your help all the time...
Eranga Smile | :)

Nelek11-Nov-07 22:42

Nelek

11-Nov-07 22:42

And what is the problem with global/class_member variables?

You can use them along your class, or between classes, without a problem.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

“The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson

Wink | ;)

Re: Arguments from different functions to a single function.

CodingLover11-Nov-07 22:54

Re: Arguments from different functions to a single function.

11-Nov-07 22:54

It's true pal. But if I change my code now it can be a real mess for me. Because I have to change lots of coding parts in my code.

I appreciate your help all the time...
Eranga Smile | :)

Rajesh R Subramanian11-Nov-07 22:58

Rajesh R Subramanian

11-Nov-07 22:58

I don't think it's so difficult. Just declaring the variables which you want to access from multiple functions globally will do all the magic for you. That's the reason why global variables exist.

Do remember that global and static variables can be bad if you use them carelessly.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->ßRÅhmmÃ<-·´¯`·.

Re: Arguments from different functions to a single function.

Nelek11-Nov-07 23:10

Nelek

11-Nov-07 23:10

Declare the variables at the header, initialize them in the constructor and use "search and replace" to change the names is a lot of work?

What do u prefer? Do that "lot" of work now? Or having scope/access problems in every thing you code afterwards?

Re: Arguments from different functions to a single function.

CodingLover11-Nov-07 23:20

Re: Arguments from different functions to a single function.

11-Nov-07 23:20

Now actually I have no idea what to do... Hmmm | :|

Here is a one function I've used.

<br />
void CSRFDBDlg::GetMess(int length, char * buffer, ADODB::_RecordsetPtr pRecSet)<br />
{<br />
	UpdateData(TRUE);		<br />
<br />
	_variant_t vtData;	// VARIANT data type<br />
	long nRetLength = 0;	// Dummy value<br />
<br />
	_variant_t vAppendChunck = BinaryToVariant((BYTE*)buffer, length, nRetLength);<br />
	pRecSet->Fields->GetItem("Bio_Data")->AppendChunk(vAppendChunck);<br />
<br />
	vtData.vt = VT_I2;<br />
	vtData.iVal = (int)nRetLength;<br />
	pRecSet->Fields->GetItem("Bio_Size")->PutValue(vtData);<br />
}<br />

Here I have two values to store in the database.

I appreciate your help all the time...
Eranga Smile | :)

Rajesh R Subramanian11-Nov-07 22:49

Rajesh R Subramanian

11-Nov-07 22:49

I don't understand why can't you use global variables.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->ßRÅhmmÃ<-·´¯`·.

Re: Arguments from different functions to a single function.

CodingLover11-Nov-07 22:58

Re: Arguments from different functions to a single function.

11-Nov-07 22:58

Ok, here is a real scenario may that why I have use this. Mainly I've read a file and find different data from it, on different functions. On the same function I store them in a database. That mean I've store data on the database in different places(ie: on different functions).

What I want to do is, store all the data on a single function. I think it is clear to me, when I look at the code. May be I can use those codes later.

I appreciate your help all the time...
Eranga Smile | :)

Rajasekharan Vengalil11-Nov-07 22:16

Re: Arguments from different functions to a single function.

11-Nov-07 22:16

What exactly do you mean when you say you wish to use the other functions from a single function?

--
gleat
http://blogorama.nerdworks.in[^]
--

CodingLover11-Nov-07 22:19

Re: Calculated values from different functions to a single function.

11-Nov-07 22:19

Seems to me, my explanation is not clear of the question. Please look at the replay for baerten.

I appreciate your help all the time...
Eranga Smile | :)

only coder11-Nov-07 22:29

only coder

11-Nov-07 22:29

typedef struct tagRET_VAL
{
int code;
void* pValue;
}RET_VAL, *PRETVAL;

enum CODE{ CODE_INT, CODE_STRING };

void fun1()
{
int a = 10;

RET_VAL rv;
rv.code = CODE_INT;
rv.pValue = &a;
return &rv;
}

void fun2()
{
char s[] = "hello";

RET_VAL rv;
rv.code = CODE_STRING;
rv.pValue = s;
return &rv;
}

void GetValue( PRET_VAL pRV )
{
switch( pRV->code )
{
case CODE_INT:
// do something with (int *)pRV->pValue ....
break;
case CODE_STRING:
// do something with (char *)pRV->pValue ...
break;
}
}

Re: Calculated values from different functions to a single function.

Xing Chen11-Nov-07 22:35

Xing Chen

11-Nov-07 22:35

I seems you want to use other process's function,as your's.
I suggest you do it in Inject dll,and return result to your application.
hope this article will be help you:
http://www.codeproject.com/library/InjLib.asp[^]

ADO, Can Bookmark be used to remember the current position of record? [modified]

followait11-Nov-07 21:48

followait

11-Nov-07 21:48

I do it like this:

<br />
_variant_t Bookmark=m_pRS->Bookmark;<br />
//use m_pRS->Move() move around<br />
m_pRS->Bookmark=Bookmark //want it back, is it true?<br />

However, in some case an error will occur in the statement:

<br />
_variant_t Bookmark=m_pRS->Bookmark;<br />

I used try-catch, it's an unknown error.

What I want to do is to remeber the current position for back.
Is there an efficient way?
And How to make my recordset support bookmark?

Thanks very much.

-- modified at 4:28 Monday 12th November, 2007

Back to the roots

Rage11-Nov-07 21:26

Rage

11-Nov-07 21:26

I have an visual c++6.0 dll workspace, that I would like to compile as a lib. Is it necessary to create a new dsp, or may I screw the settings of the dll dsp so that it can compile as a static lib ?

And yes, I do feel ashamed to still have to ask such basic questions Blush | :O

Thanks,
RaGE

~RaGE();

I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus

Do not feed the troll ! - Common proverb

baerten11-Nov-07 21:47

baerten

11-Nov-07 21:47

In the procect-explorer, you choose your project and click on properties.
or in the main-menu on project -> <your_projectname> settings

There'in you have the possibility to choose the kind of "output" DLL,LIB or EXE.
Then you choose LIB. You find this page at "configuration-properties"

I hope it works Wink | ;)

BTW: my visual studio is in german, so i don't know the exact names of the menu-elements Smile | :)

Rage11-Nov-07 22:13

Rage

11-Nov-07 22:13

baerten wrote:
There'in you have the possibility to choose the kind of "output" DLL,LIB or EXE.

In which tab is this exactely ( Did you notice Visual C++6.0) ?

baerten wrote:
my visual studio is in german, so i don't know the exact names of the menu-elements

Mine too

~RaGE();

I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus

Do not feed the troll ! - Common proverb

Nelek11-Nov-07 22:33

Nelek

11-Nov-07 22:33

Projekt -> Einstellungen (ALT+F7) (Benutzer definiertes)

But actually I think you should do nothing. The compilation already gives you the *.dll, *.lib and *.def

You choose what you want to use, when integrating the dll in other projekt. Static or dinamic

BTW, have your tried "Erstellen -> Alles neu erstellen...?"