Re: why can not get the variable value correctly - ATL / WTL / STL Discussion Boards

How to access global functions and global variables in ATL Component.

kiran janaswamy11-Apr-06 1:25

11-Apr-06 1:25

hi all,

how to access global functions and global variables in an Method of an Interface. i mean i have an interface, in an interface i have a method where i have to access a global member function. how can we achieve this.

thanks
uday.

uday kiran

Re: How to access global functions and global variables in ATL Component.

Milton Karimbekallil11-Apr-06 11:07

Milton Karimbekallil

11-Apr-06 11:07

Include the header file for the global function in the interface implimenatation class and call the global function. also for the global variable use the extern declaration and use it. there is no diffrence in com for calling a global function/variable. One thing is, be aware that the value of global variable will be shared across instances.

rgds...mil10

Re: How to access global functions and global variables in ATL Component.

kiran janaswamy11-Apr-06 20:05

kiran janaswamy

11-Apr-06 20:05

if i have used a globla function every thing is fine but it is getting linker error like:

LNK2001: unresolved external symbol "void __cdecl fun(void) when linking my atl component when using.

thanks
uday.

uday kiran

Re: How to access global functions and global variables in ATL Component.

kiran janaswamy12-Apr-06 1:03

kiran janaswamy

12-Apr-06 1:03

hi mil,

thanks for your good suggestion, i have got the solution.

thanks,
uday.

uday kiran

MFC ActiveX

Subramaniam s.V.10-Apr-06 0:12

Subramaniam s.V.

10-Apr-06 0:12

I am a beginner in ActiveX..I have created a very small application using MFC ActiveX ControlWizard..my control has a button and a text box..when I try to include this control into my client always my control gets displayed as an ellipse..i dont find my control(button and textbox)..

sorry if this is a basic question..pls dont mind as I am totally new to ActiveX controls etc..

Re: MFC ActiveX

Milton Karimbekallil11-Apr-06 11:11

Milton Karimbekallil

11-Apr-06 11:11

MFC wizard appends elips drawing code in the OnDraw method of the control. Remove it and chk.

cheers....mil10.

why can not get the variable value correctly

brygid9-Apr-06 20:24

brygid

9-Apr-06 20:24

hello,I wrote a property named get_Popvalue(long *nValue),
STDMETHODIMP CATC:get_Popvalue(long *nValue)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState())
// TODO: Add your implementation code here
*pVal = m_dSendBytes;
TRACE1("m_dSendBytes:%d\n",m_dSendBytes);
//m_dSendBytes is not changed here??
return S_OK;
}
and m_dSendBytes is a public variable the defined in the class CATC.

m_dSendBytes will be changed in another function CATC:NotifyData()

void CATC:NotifyData(long nSize)
{
m_dSendBytes += nSize;
//m_dSendBytes can be changed here
}

but m_dSendBytes can not get correctly by com invoked.
Can you tell me why? Thanks

Re: why can not get the variable value correctly

Milton Karimbekallil11-Apr-06 11:18

Milton Karimbekallil

11-Apr-06 11:18

*pVal = m_dSendBytes;

Here pVal is not declared in the code. The function parameter declaration is nValue and not pVal. The posted code shud not complie. if it is a typing mistake, then chk the IDL declaration for the property. Other than the variable name change issue, the code code you posted doesnt have any error.

cheers...mil10.

Accessing members of objects stored in container.

gc3isr8-Apr-06 19:59

gc3isr

8-Apr-06 19:59

I am using the STL list container to hold objects of class a. Class a has various member variables of standard type(int, char, etc.). All variables are public. How would I go about accessing those variables in order to compare one object to another?

This is some of my actual code.

void ProcessFile(string filename, std::queue<cjob> &jobQueue)
{
char jobID = 'Z';
int numJobs;
int priority;
int arrivaltime;
int cpuburst[2];
int ioburst[2];

int i;

// ofstream constructor opens file
ifstream injobFile( filename.c_str(), ios::in );
ifstream injobFile1( filename.c_str(), ios::in );
// exit program if unable to create file
if ( !injobFile )
{ // overloaded ! operator
cerr << "File could not be opened" << endl;
exit( 1 );
} // end if

cout << "Reading file..." << endl;

/* //Count number of jobs by counting occurrences of \n
numJobs = static_cast<int>( std::count( std::istreambuf_iterator<char>(injobFile1),
std::istreambuf_iterator<char>(), '\n' ) );
*/

char crap = '(';

//input from file;
i = 0;
//Job * ptrarr_Jobs[10];

while ( i < numJobs)
{
injobFile >> crap >> jobID >> priority >> arrivaltime >> cpuburst[0] >> ioburst[0] >> cpuburst[1] >> ioburst[1] >> crap;

CJob tempJob(jobID, priority, arrivaltime, cpuburst[0], ioburst[0], cpuburst[1], ioburst[1] );
//tempJob = new CJob(jobID, priority, arrivaltime, cpuburst[0], ioburst[0], cpuburst[1], ioburst[1] );

jobQueue.push(tempJob);

cout << "(" << jobID << ' ' << priority << ' ' << arrivaltime
<< ' ' << cpuburst[0] << ' ' << ioburst[0]
<< ' ' << cpuburst[1] << ' ' << ioburst[1]
<< ")" << endl;

i++;

} // end while

return ; // ofstream destructor closes file
} // end ProcessFile()

Notice I referenced the queue; I am having trouble accessing the CJob objects' member variables when I am in the calling function...(main() in this case).

Thanks for any help.

CAxWindow

Anthony98875-Apr-06 9:07

Anthony9887

5-Apr-06 9:07

Hi,

I'm trying to use the CAxWindow class to create a runtime control in a CDialog box. I have no problem creating the control but how can I call the methods of the control.

Thanks

Re: CAxWindow

Michael Dunn5-Apr-06 13:36

Michael Dunn

5-Apr-06 13:36

See my WTL series part 6[^]

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: CAxWindow

Anthony98876-Apr-06 4:44

Anthony9887

6-Apr-06 4:44

Hi Michael,

The problem I'm having is my Active(ocx) control does not have any interface pointers. All I have is dispinterface for the ocx. Do you know how I call the methods of this control.

Thanks

Re: CAxWindow

Stuart Dootson7-Apr-06 23:06

Stuart Dootson

7-Apr-06 23:06

You'll be calling it through IDispatch. Use IDispatch::GetIDsOfNames to map method names to IDs, then use those in IDispatch::Invoke. To discover what methods are avaialable, use IDispatch::GetTypeInfo.

Have a look at the source for CComDispatchDriver::Invoken in the ATL that comes with VC++ 6 for some guidance.

how can I use control ?which book I shoud see?

heboy3-Apr-06 17:37

heboy

3-Apr-06 17:37

I am a beginner.My first program is show a picture on one static control which based on dialog!And I use WTL to do it,is there some example code ?
Or which book shoud I read!
Pre_thank you for give me a direct!My english is very poor,sorry!Just can read some comment!
I will online wait for you today!

heboy, the name is same as my real name!its meaning is "river "

Re: how can I use control ?which book I shoud see?

Michael Dunn4-Apr-06 11:46

Michael Dunn

4-Apr-06 11:46

I have a series on WTL starting here[^], however it probably won't be too helpful if you have no Windows or GUI programming experience already.
I always advise newbies to start at the API level, and not to move on to libraries until you have a very good understanding of how the APIs work.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: how can I use control ?which book I shoud see?

heboy4-Apr-06 15:45

heboy

4-Apr-06 15:45

thank you !I think I know some about API !your help is very useful! And your
advice is good for me!

heboy

How can i sort the elements of the CListCtrl by clicking the Column Heading

Jitendra Shri3-Apr-06 17:24

Jitendra Shri

3-Apr-06 17:24

Hi all,
I am using ATL COM application, in which i am having a list control, i want that by clicking the particular column the elements of that column sorted out how can i do it ...Plz help me out

I write one callback function for sorting and i called that function in the OnColumnClickListname handler i share my code

LRESULT OnColumnclickList1(int idCtrl, LPNMHDR pnmh, BOOL& bHandled)

{
// My code started here
m_ctrllist.Attach(GetDlgItem(IDC_LIST1));
HD_NOTIFY *phdn = (HD_NOTIFY *) pnmh;
m_ctrllist.SortItems(SortFunc, phdn->iItem);
m_ctrllist.Detach();

//My code ends here

return 0;
}

static int CALLBACK SortFunc(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort)
{

int nRetVal;

PITEMDATA pData1 = (PITEMDATA)lParam1;
PITEMDATA pData2 = (PITEMDATA)lParam2;

switch(lParamSort)
{
case 0:
nRetVal = strcmp(pData1->empcode,
pData2->empcode);
break;

case 1:
nRetVal = strcmp(pData1->empname,
pData2->empname);
break;

case 2:
nRetVal = strcmp(pData1->designation, pData2->designation);
break;

default:
break;
}

return nRetVal;
}

Re: How can i sort the elements of the CListCtrl by clicking the Column Heading

Igor Vigdorchik4-Apr-06 7:24

Igor Vigdorchik

4-Apr-06 7:24

Use CSortListViewCtrlImpl, it does sorting for you.

Base64Encode

gyzmau3-Apr-06 4:04

gyzmau

3-Apr-06 4:04

Hi I'm using ATL just for one function.
Base64Encode.
I don't make server or network i want juste Encode a string.
I try to make it with an example
from CodeProject:

CString sSource = "ToEncode";<br />
<br />
int nDestLen = Base64EncodeGetRequiredLength(sSource.GetLength());<br />
CString str64;<br />
Base64Encode((const BYTE*)(LPCSTR)sSource, sSource.GetLength(), <br />
             str64.GetBuffer(nDestLen), &nDestLen);<br />
str64.ReleaseBuffer(nDestLen);<br />
cout<<(LPCSTR)str64;

It said me Cannot convert CString to LPCSTR one first argument of Base64Encode.

I'm working under VS2005.
It's the right way to do what i want?
Is there a better way, maybe something else than ATL?
How to correct this error?

Thanks for your answer.
Sorry for my poor english i'm not an english-speaking

Re: Base64Encode

SilentSilent5-Apr-06 0:16

SilentSilent

5-Apr-06 0:16

gyzmau wrote:
Is there a better way, maybe something else than ATL?

You can find many places with Base64 code on the internet, e.g.
http://www.ruffboy.com/download.htm[^]

How can i sort list in the ATL application

Jitendra Shri31-Mar-06 3:09

Jitendra Shri

31-Mar-06 3:09

Hi all,
I am using ATL wizard to make my ATL application and i have ClistCtrl and i want to sort the list,How can i do this if any one having any idea please share it,it will be very thankfull to me
Thanks in advance

Re: How can i sort list in the ATL application

Milton Karimbekallil1-Apr-06 3:01

Milton Karimbekallil

1-Apr-06 3:01

By default CListCtrl will sort items in ascending order.
You can control sort order programatically by setting the style LVS_SORTASCENDING or LVS_SORTDESCENDING

cheers..mil10.

Re: How can i sort list in the ATL application

Igor Vigdorchik2-Apr-06 10:26

Igor Vigdorchik

2-Apr-06 10:26

Just use CSortListViewCtrlImpl, that's all.

how to declare a method with out parameter

baldha rakesh30-Mar-06 23:26

baldha rakesh

30-Mar-06 23:26

i am new with ATL , i want to declare a method which have a out parameter, i am decalaring this like

[id(1), helpstring("method calcution")] HRESULT calcution([in] int ival1 ,[in] int ival2,[out] int& iret);

but i compiled this is giving errors like
syntax error : expecting a declarator or * near "&"
syntax error : expecting ) near "&"

please give me answer as soon as possible.

Bankey Khandelwal
Software Engineer

Re: how to declare a method with out parameter

Stephen Hewitt30-Mar-06 23:39

Stephen Hewitt

30-Mar-06 23:39

IDL doesn't have references. Try this:

[id(1), helpstring("method calcution")] HRESULT calcution([in] int ival1, [in] int ival2, [out, retval] int *pRet);

Steve

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