Re: Copy Memory - C / C++ / MFC Discussion Boards

Re: error LNK2005: ... already defined in .....

Naveen19-May-06 1:18

Naveen

19-May-06 1:18

sorry i actually want to answer Cedric Moonen

Frown | :(

nave

Re: error LNK2005: ... already defined in .....

Cedric Moonen19-May-06 1:25

Cedric Moonen

19-May-06 1:25

Naveen R wrote:
sorry i actually want to answer Cedric Moonen

Always quote when you answer somebody. That will avoid such kind of confusion Wink | ;)

.

Yeah, I know that's why I was asking for more precisions to see how he declared his variable.

Cédric Moonen
Software developer

Charting control

Re: error LNK2005: ... already defined in .....

Nibu babu thomas19-May-06 1:05

Nibu babu thomas

19-May-06 1:05

Declare the variable in your header file as extern and define it in one of your .cpp files of your dll.

Nibu thomas
Software Developer

Faqs by Michael dunn

Re: error LNK2005: ... already defined in .....

Cyber Friend19-May-06 1:40

Cyber Friend

19-May-06 1:40

I have done that but error now changed from LNK2005 to LNK2001 . I m using multiply() function as well from dll but error is only regarding the variable multiplier.
Now error turns to be:

Linking...
CheckTestDllDlg.obj : error LNK2001: unresolved external symbol "int multiplier" (?multiplier@@3HA)
Debug/CheckTestDll.exe : fatal error LNK1120: 1 unresolved externals

Cyber Friend

Re: error LNK2005: ... already defined in .....

Nibu babu thomas19-May-06 1:45

Nibu babu thomas

19-May-06 1:45

Cyber Friend wrote:
Linking...
CheckTestDllDlg.obj : error LNK2001: unresolved external symbol "int multiplier" (?multiplier@@3HA)
Debug/CheckTestDll.exe : fatal error LNK1120: 1 unresolved externals

This is happening because you haven't declared it in the .cpp file...

for e.g.

in yourclass.h

extern UINT multiplier;

in yourclass.cpp or some other .cpp file that is in the project...

UINT multiplier = 0; //don't do this in some function body declaration. Best would at the top after include

Nibu thomas
Software Developer

Faqs by Michael dunn

Re: error LNK2005: ... already defined in .....

Cyber Friend19-May-06 2:24

Cyber Friend

19-May-06 2:24

Hi Thomas,
I have done that but error now changed from LNK2005 to LNK2001 . I m using multiply() function as well from dll but error is only regarding the variable multiplier.
Now error turns to be:

Linking...
CheckTestDllDlg.obj : error LNK2001: unresolved external symbol "int multiplier" (?multiplier@@3HA)
Debug/CheckTestDll.exe : fatal error LNK1120: 1 unresolved externals

n this is dll header file

//////////////////////////////////////////// simple.h/////////////////

#include "String.h"
#include // MFC core and standard components

#ifndef SIMPLE_H
#define SIMPLE_H

long multiply(long no);
#endif
///////////////////////////////////////////////////////////////////////

this is cpp file of Dll
////////////////////////////////////////////simple.cpp ///////////////////////////////////
#include "stdio.h"
#include "simple.h"

static long multiplier=14L;
long multiply(long no)

{

long retval;
retval = no * multiplier;

st.Format("Reslt is %d",retval);
MessageBox(NULL,st,"I",MB_OK);
return retval;
}
///////////////////////////////////////////////////////////////////////

n i m using this variable in other application first defining above the class header file like this
extern long multiplier;
n then in one of class function i m using this variable.

Cyber Friend

Copy Memory

satsumatable19-May-06 0:45

satsumatable

19-May-06 0:45

Whats the possibility to set some text to the memory and read the same text after a while but in the same process. If it is possible how can i accoplish this please explain me in detial.

I have tried with memset() and etc., but i couldnt see the desired output.

Re: Copy Memory

Laxman Auti19-May-06 0:58

Laxman Auti

19-May-06 0:58

sivaprakashshanmugam wrote:
Whats the possibility to set some text to the memory and read the same text after a while but in the same process. If it is possible how can i accoplish this please explain me in detial.

if i am not wrong , are you trying to keep the persistantancy of the data

if then try to use the static for persistancy.

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Re: Copy Memory

satsumatable19-May-06 0:59

satsumatable

19-May-06 0:59

Actually i am reading some text from file so it will be a stream of Bytes, i need to send bytes to MFC Activex control and i need to read it. I have tried in many ways but i couldnt so i am thought going this method. Do you have solution for this.

Re: Copy Memory

Laxman Auti19-May-06 1:15

Laxman Auti

19-May-06 1:15

sivaprakashshanmugam wrote:
Actually i am reading some text from file so it will be a stream of Bytes, i need to send bytes to MFC Activex control and i need to read it. I have tried in many ways but i couldnt so i am thought going this method. Do you have solution for this.

See,
You can read the file in text format you will get char string...
Convert that string into BSTR using ConvertStringToBSTR() function and
simply pass this bstr string to ActiveX control.
if you wanna a reflection on the BSTR then pass the pointer of it.

Another way is create the property of an Activex and set the string data to it read from file.

hope this helps you.

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

-- modified at 7:16 Friday 19th May, 2006

Re: Copy Memory

Maxwell Chen19-May-06 1:06

Maxwell Chen

19-May-06 1:06

// Global buffer.<br />
BYTE* p = NULL;<br />
<br />
// Some function.<br />
BYTE* ReadFileIntoBuffer(...)<br />
{<br />
  if(!p) { p = new BYTE[file_size]; }<br />
  // ReadFile(...);<br />
}<br />
<br />
// The other function.<br />
bool PassToActiveXCtrl(...)<br />
{<br />
  return ctrl.Input(p, file_size);<br />
}

Maxwell Chen

Re: Copy Memory

NiceNaidu19-May-06 1:21

NiceNaidu

19-May-06 1:21

This is the method that i have used to transfer data between two different processes in one of my projects.

//In one Process(server)

<br />
HGLOBAL hMem;<br />
hMem = GlobalAlloc(0, (800*sizeof(char)));<br />
if(NULL == hMem)<br />
	return;<br />
char* szVal = (char*) GlobalLock(hMem);<br />
<br />
memcpy(szVal, buffer, 800);<br />
if(!OpenClipboard(NULL))<br />
	return;<br />
if(!EmptyClipboard())<br />
	return;<br />
HANDLE hData = SetClipboardData(CF_TEXT , hMem);<br />
	if(NULL == hData)<br />
		return;<br />
if(!CloseClipboard())<br />
	return;<br />
if(!GlobalUnlock(hMem))<br />
	return;

//In the Second Process(Client)

if(!IsClipboardFormatAvailable(CF_TEXT))<br />
	return -1;<br />
OpenClipboard(NULL);<br />
     hgbl = GetClipboardData(CF_TEXT);<br />
char* szVal = (char*) GlobalLock(hgbl);<br />
char chScriptData[128];<br />
<br />
GlobalUnlock(hgbl);<br />
CloseClipboard();

Appu..
"If you judge people, you have no time to love them."

Flip an image

anjita19-May-06 0:26

anjita

19-May-06 0:26

I am displaying an image using dib class . now i wish to flip my image horizontally as well as vertically
::StretchDIBits(pDC->m_hDC, // hDC
lpDCRect->left, // DestX
lpDCRect->top, // DestY
RECTWIDTH(lpDCRect), // nDestWidth
RECTHEIGHT(lpDCRect), // nDestHeight
lpDIBRect->left, // SrcX
lpDIBRect->top, // SrcY
m_pBMI->bmiHeader.biWidth,//RECTWIDTH(lpDIBRect), // wSrcWidth
RECTHEIGHT(lpDIBRect), // wSrcHeight
m_pBits, // lpBits
m_pBMI, // lpBitsInfo
DIB_RGB_COLORS, // wUsage
SRCCOPY); // dwROP
As per MSDN Documents i am changing the sign also but i am unable to get th desird result
Please if someone could help me out
I am new to vc++

-- modified at 6:26 Friday 19th May, 2006

Re: Flip an image

Sarath C19-May-06 0:35

Sarath C

19-May-06 0:35

have u tried this flag in your code?

DSTINVERT

-Sarath

Re: Flip an image

anjita19-May-06 0:51

anjita

19-May-06 0:51

No this is not helping by doing this i can see only the black box in the destination

Re: Flip an image

NiceNaidu19-May-06 0:52

NiceNaidu

19-May-06 0:52

Chck this link. http://www.codeguru.com/forum/archive/index.php/t-104069.html[^]

Appu..
"If you judge people, you have no time to love them."

Re: Flip an image

anjita19-May-06 1:59

anjita

19-May-06 1:59

Thanks a lot this solved my problem

Re: Flip an image

Hamid_RT19-May-06 0:56

Hamid_RT

19-May-06 0:56

maybe it is some helpful to you
Add fast user-extensible image processing support to CBitmap[^]

whitesky

IO.H Required

Rajesh R Subramanian19-May-06 0:11

Rajesh R Subramanian

19-May-06 0:11

I need to perform some IO routines (C programming under linux) and I realised many of these routines are in the file io.h but i do not know where could I get a copy of this file. I know that this file is free for distribution (The open source verison is free). Where do I get to download this header file? Any help or pointers in this direction is highly appreciated.

Regards,
Rajesh R. Subramanian

You have an apple and me too. We exchange those and We have an apple each.
You have an idea and me too. We exchange those and We have two ideas each.

-- Moved by Ed. at 9:33 Friday 19th May, 2006

Re: IO.H Required

Colin Angus Mackay19-May-06 0:29

Colin Angus Mackay

19-May-06 0:29

Wrong forum - Please see the big red sign when starting a new thread in this forum that says quite explicity "No programming questions". Try an appropriate programming forum.

"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
--Charles Babbage (1791-1871)
My: Website | Blog

Re: IO.H Required

Rajesh R Subramanian19-May-06 0:33

Rajesh R Subramanian

19-May-06 0:33

Sorry to have disturbed you. But, how did this become a programming question? I did not ask the C++ language commands to know how to open the usb port and get access to the buffer or anything. I just asked where would I get the file io.h

You have an apple and me too. We exchange those and We have an apple each.
You have an idea and me too. We exchange those and We have two ideas each.

Re: IO.H Required

Maxwell Chen19-May-06 0:35

Maxwell Chen

19-May-06 0:35