Re: about parameter passing - C / C++ / MFC Discussion Boards

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Re: why private virtual function?

George_George16-Mar-08 0:12

George_George

16-Mar-08 0:12

Thanks Rajesh,

So, the guideline should be, making virtual function private, and if we need to call virtual function from base class in derived class, then making virtual function protected? Right?

regards,
George

HOW TO ADD PROJECT INTO WORKSPACE

bala_potty15-Mar-08 1:54

bala_potty

15-Mar-08 1:54

Hi,

I have two different dialog based VC++ project called Main & sub.

When a OK button of Main project is clicked I want Dialogbox of Sub to be executed.

Can anybody help.

Thanks,

Bala.

bala_potty

about parameter passing

savitri15-Mar-08 1:07

savitri

15-Mar-08 1:07

hi everyone,

good afternoon to all.i am writing one OCX file.in that file i am doing read and write functions. and in another project i am using that OCX.When i am passing parameters to that function then that time values taking as null.in runtime when i given some values to that parameters that time also they are takingas null only.in VC++ how can i pass the parameters by refence please Tell me i am in tension.please.
in OCX file write function is

WriteBlk(LPCTSTR MemId, LPCTSTR MemName, LPCTSTR eDate, LPCTSTR Balance, LPCTSTR TagId);<br />
and in my main project write block is like this:<br />
writeBlk(m_Memid,m_Memname,m_eDate,m_cBalance,m_Tadid);

these variables are of type CString

Thanku in advance,
savitri. Confused | :confused:

Re: about parameter passing

_808615-Mar-08 7:33

_8086

15-Mar-08 7:33

Shame

<br />
writeBlk(&m_Memid,&m_Memname,&m_eDate,&m_cBalance,&m_Tadid);<br />

----------------------------
286? WOWW! Blush | :O

Re: about parameter passing

Rajkumar R15-Mar-08 10:44

Rajkumar R

15-Mar-08 10:44

_8086 wrote:
Shame

writeBlk(&m_Memid,&m_Memname,&m_eDate,&m_cBalance,&m_Tadid);

delete it before the OP reply the shame to you.

Re: about parameter passing

savitri16-Mar-08 21:46

savitri

16-Mar-08 21:46

thanku for helping me.but by using like this i am getting error like this:
error C2664: 'WriteBlk' : cannot convert parameter 2 from 'class CString *' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.

Please tell me how shall i pass the parameters.
Thanku in advance,
savitri

Re: about parameter passing

_808617-Mar-08 6:44

_8086

17-Mar-08 6:44

use (const char*) CString. or
char temp[256];
CString cs;
cs.getBuffer(temp,cs.getLength());
cs.ReleaseBuffer();

Now pass the temp.

----------------------------
286? WOWW! Blush | :O

Re: about parameter passing

JudyL_MD17-Mar-08 7:35

JudyL_MD

17-Mar-08 7:35

_8086 wrote:
use (const char*) CString

Yes

_8086 wrote:
char temp[256];
CString cs;
cs.getBuffer(temp,cs.getLength());
cs.ReleaseBuffer();

Now pass the temp.

No. The temp variable returned by GetBuffer is only guaranteed to be valid up until the time that ReleaseBuffer is called. It is designed to be used when modifying the value of the CString, not for just passing a const pointer.

Judy

Re: about parameter passing

savitri17-Mar-08 20:02

savitri

17-Mar-08 20:02

hello,
thanks for giving some solution.but please tell me that in which i use this code in OCX or in my project.now i am used that in OCX like this:
CString dStr;
char temp[100];
dStr.getbuffer(temp,dStr.getLength());
but it is giving error like this:
ACR120RWCtl.cpp(810) : error C2660: 'GetBuffer' : function does not take 2 parameters.
So please will u tell me how can pass the parameters.i am not getting back the result to the form.please HELP me.

Thanku,
savitri OMG | :OMG:

can anybody tell me how to execute an exe from my application in vc++

philiptabraham15-Mar-08 0:28

philiptabraham

15-Mar-08 0:28

can anybody tell me how to execute an exe from my application in vc++.i tried with winexec but was not able to execute my exe but it worked for executing Notepad.exe..... can anybody help

Re: can anybody tell me how to execute an exe from my application in vc++

Rajesh R Subramanian15-Mar-08 0:30

Rajesh R Subramanian

15-Mar-08 0:30

philiptabraham wrote:
tried with winexec but was not able to execute my exe but it worked for executing Notepad.exe

So why can't you just show us what you tried? Are we supposed to guess how you're writing code?

Also, consider using ShellExecute[^].

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: can anybody tell me how to execute an exe from my application in vc++

Rajkumar R15-Mar-08 0:33

Rajkumar R

15-Mar-08 0:33

use CreateProcess or ShellExecute, Does your exe normally runs when you execute it not programmatically.

Re: can anybody tell me how to execute an exe from my application in vc++

David Crow15-Mar-08 4:34

David Crow

15-Mar-08 4:34

Have you read this?

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

[Message Deleted]

Le@rner14-Mar-08 21:27

Le@rner

14-Mar-08 21:27

[Message Deleted]

Re: help me its urgent.

Rajkumar R15-Mar-08 0:07

Rajkumar R

15-Mar-08 0:07

ThatsMe. wrote:
please help me its urgent.

Its better to avoid doing the above task in urgent. Otherwise since it is context sensitive help you end up with incorrect context.

If you are not in urgent give a precise subject and modify the message following guidelines[^] to get an answer

Re: help me its urgent.

Rajesh R Subramanian15-Mar-08 0:30

Rajesh R Subramanian

15-Mar-08 0:30

Rajkumar R wrote:
Its better to avoid doing the above task in urgent. Otherwise since it is context sensitive help you end up with incorrect context.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: help me its urgent.

Paul Conrad15-Mar-08 12:55

Paul Conrad

15-Mar-08 12:55

ThatsMe. wrote:
its urgent

That is considered rude on this site.

"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus

convert CString to WCHAR

neha.agarwal2714-Mar-08 19:46

neha.agarwal27

14-Mar-08 19:46

Hi all,

I want to convert CString to WCHAR;

i have done this:-

WCHAR wsz[MAX_PATH];
CString szLinkName = _T("Test Mail");
MultiByteToWideChar(CP_ACP, 0, (LPCSTR)(LPCTSTR)szLinkName, -1, 
                    wsz, MAX_PATH);

but i only get "T" in wsz i.e first element....

I am working in VC2005

Can anybody help me in this...

Thanks in advance

Re: convert CString to WCHAR

Rajesh R Subramanian14-Mar-08 20:39

Rajesh R Subramanian

14-Mar-08 20:39

This is the Gabababazillionth time this question is asked. Please learn to use Google[^].

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: convert CString to WCHAR

Rajkumar R15-Mar-08 0:12

Rajkumar R

15-Mar-08 0:12

neha.agarwal27 wrote:
MultiByteToWideChar(CP_ACP, 0, (LPCSTR)(LPCTSTR)szLinkName, -1, wsz, MAX_PATH);

how and why do you decided to use MultiByteToWideChar here?

Re: convert CString to WCHAR

Mathias S.15-Mar-08 0:32

Mathias S.

15-Mar-08 0:32

Why do it the hard way when there are macros in ATL to do it for you.

#include <atlconv.h>

void MyFunc(WCHAR* s)
{
USES_CONVERSION;

CString str = W2T(s);
}

Just make sure you don't use W2T() in a loop since it allocate memory from the stack.
then use W2T_EX instead and USES_CONVERSION_EX;

Re: convert CString to WCHAR

David Crow15-Mar-08 4:36

David Crow

15-Mar-08 4:36