C / C++ / MFC Discussion Boards

PabloN wrote:
...when i move my groupbox the radio button won't.

This is normal behavior with VS v6. Has that changed with VS 2005?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

I build a dialog based MFC program.

in the file "StdAfx.h" I add the following code,which is used to define a global variable of type CString.

#ifndef jjjjjjjjjjjjjjjjjjj
#define jjjjjjjjjjjjjjjjjjj
CString StrGlobal;
#endif

and then I use it in another file "newfile.cpp"

#include "stdafx.h"
extern CString StrGlobal;
void fun()
{
   StrGlobal = _T("KDKDK");
}

when I build the program, following link error shows up:

Linking...
StdAfx.obj : error LNK2005: "class CString StrGlobal" (?StrGlobal@@3VCString@@A) already defined in newfile.obj

why dose this happen? and how can I fix it ?

Thank you very much!!!

-------------------
I am learning C++ and English

You've got the extern in the wrong file: It should be in the .h file.

Steve

I build a dialog based MFC program.

in the file "StdAfx.h" I add the following code,which is used to define a global variable of type CString.

#ifndef jjjjjjjjjjjjjjjjjjj
#define jjjjjjjjjjjjjjjjjjj
CString StrGlobal;
#endif

and then I use it in another file "newfile.cpp"

#include "stdafx.h"
extern CString StrGlobal;
void fun()
{
   StrGlobal = _T("KDKDK");
}

when I build the program, following link error shows up:

Linking...
StdAfx.obj : error LNK2005: "class CString StrGlobal" (?StrGlobal@@3VCString@@A) already defined in newfile.obj

why dose this happen? and how can I fix it ?

Thank you very much!!!

-------------------
I am learning C++ and English

move the declaration
CString StrGlobal; to stdafx.cpp or make the varaiable static

nave

yes, I make it static and it works. thank you so much.
but ,could you please explain to me briefly the reason?

-------------------
I am learning C++ and English

The .h file might have been include by multiple cpp file. so while compiling , the variable will be present in the vtable of obj file corresponding to each cpp. so while linking, linker will find multiple object and generates the error since it dosen't know to which obj it have to link.

nave

ewighell wrote:
#ifndef jjjjjjjjjjjjjjjjjjj
#define jjjjjjjjjjjjjjjjjjj
CString StrGlobal;
#endif

#ifndef jjjjjjjjjjjjjjjjjjj
#define jjjjjjjjjjjjjjjjjjj
   extern CString StrGlobal;
#endif

ewighell wrote:
#include "stdafx.h"
extern CString StrGlobal;
void fun()
{
StrGlobal = _T("KDKDK");
}

#include "stdafx.h"
CString StrGlobal;
void fun()
{   
   StrGlobal = _T("KDKDK");
}

Nibu thomas
Software Developer

For backup purpose Windows OS makes an Emergency Repair Disc(ERD) through Windows Backup Utility.In That
it makes a folder named RegBack, where it copies all registry values to files. I want to do the exactly same in my
program through VC++. Can anybody give me some direction please.I need help

nirmal

Hi

you can use the shellExecute for invoking the backup process from your VC++ apllication.

For windows Xp: you can call ShellExecute on rstrui.exe

For Windows 2000: you can call ShellExecute on ntbackup.exe

Cheers
"Peace of mind through Technology"

How does this help to copy registry keys/values to a file? Confused | :confused:

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

See RegSaveKeyEx().

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

hello frnds,

I developed one application of video capturing.I used CCD Camera for this application and it display capturing window.now i want to draw a line on this capturing window but i could not draw line on it.when i run program first time it display line but when i start captuing th line disappear.I have attach the capture window on picture box.line show only after when i disconnect capturing(using capDriverDisconnect) from the capture window. if any one have solution plz send me.

The Following Code is for Attachment of Capturewindow with Picture Box.

void CSawingSystemView::OnCaptureStart()
{
// TODO: Add your command handler code here

HwndCapture = NULL;
GetDlgItem(IDC_MAIN_PICTURE_WINDOW,&hWndPicWind);//This is PictureBox Handle
::GetWindowRect(hWndPicWind,&PictureRect); //hWndPicWind is Global

capGetDriverDescription(1,DriverName,sizeof(DriverName),DriverVer,sizeof(DriverVer));
HwndCapture = capCreateCaptureWindow("Capture",WS_CAPTION|WS_VISIBLE | WS_CHILD,0,0,PictureRect.right,PictureRect.bottom,hWndPicWind,IDC_MAIN_PICTURE_WINDOW);

if(HwndCapture != NULL)
{
if(capDriverConnect(HwndCapture,1))
{

::SendMessage(HwndCapture,WM_CAP_GET_SEQUENCE_SETUP,sizeof(CapDriver),(LPARAM)(LPVOID)&CapDriver );

if( CapDriver.fHasDlgVideoDisplay == 0) AfxMessageBox("Not Support Video Dislplay");
if( CapDriver.fHasDlgVideoFormat == 0) AfxMessageBox("Not Support Video Format");
if( CapDriver.fHasDlgVideoSource == 0) AfxMessageBox("Not Support Video Source");

CAPTUREPARMS CapturePara;
double FramesPerSec;
FramesPerSec = 1000;

::SendMessage(HwndCapture,WM_CAP_GET_SEQUENCE_SETUP,sizeof(CapturePara),(LPARAM)(LPVOID)&CapturePara);
CapturePara.dwRequestMicroSecPerFrame = (1000000 / FramesPerSec);
::SendMessage(HwndCapture,WM_CAP_SET_SEQUENCE_SETUP,sizeof(CapturePara),(LPARAM)(LPVOID)&CapturePara);

if(!capPreviewScale(HwndCapture,true))
AfxMessageBox("Error in capPreviewScale");
if(!(::SendMessage(HwndCapture,WM_CAP_SET_PREVIEW,FALSE,0)))
AfxMessageBox("Error in capPreview");
if(!(::SendMessage(HwndCapture,WM_CAP_SET_OVERLAY,TRUE,0)))
AfxMessageBox("Error in capOverlay");
if(!(::SendMessage(HwndCapture,WM_CAP_SET_PREVIEWRATE,1,0)))
AfxMessageBox("Error in capPreviewRate");

}
else
{
AfxMessageBox("Specified Capture Driver cannot be connected to the Capture Window");
}
}
else
{
AfxMessageBox("Error In Creation of CaptureWindow");
}
}

And in OnPaint I has code like this;
void CSawingSystemView::OnPaint()
{

CPaintDC dc(this); // device context for painting
int center_x,center_y;
CPen cPen,*cOldPen;
CWnd *cWndPicWnd;
cPen.CreatePen(PS_SOLID,1,RGB(255,255,0));

//CaptureWndHandle = GetDlgItem(IDC_MAIN_PICTURE_WINDOW);
CaptureWndDc = GetDlgItem(IDC_MAIN_PICTURE_WINDOW)->GetDC();
GetDlgItem(IDC_MAIN_PICTURE_WINDOW)->GetWindowRect(&PictureRect);
cOldPen = CaptureWndDc->SelectObject(&cPen);

center_x = (PictureRect.right - PictureRect.left)/2;
center_y = (PictureRect.bottom - PictureRect.top)/2;

if(CaptureWndDc != NULL)
{
CaptureWndDc->MoveTo(center_x - 10,center_y);
CaptureWndDc->LineTo(center_x + 10,center_y);
CaptureWndDc->MoveTo(center_x ,center_y - 10);
CaptureWndDc->LineTo(center_x ,center_y + 10);
}
}

ok............

I am writing one dialog based program. Now by default the "space bar" is doing the same things as the "enter key". I want the space bar to be disabled. Can you please tell me how to do that?

Handle the PreTranslateMessage of dialog class and write following code

if(pMsg->message == WM_KEYDOWN)
{
if(pMsg->wParam == VK_SPACE)
{
pMsg->wParam=NULL ;
}
}

Regards
Amar Sutar Smile | :)

Its working fine. Thank you.

Plz check whehter u have the same effect even after u have changed the focus to some other controls in the dialog.

nave

You can override the PreTranslateMessage() method

Knock out "T" from CAN'T
You 'CAN' if you think you 'CAN'
Cool | :cool:

Hi dear friends,

Does anyone know how to use CORBA C++ Servers in .Net,
I use a poroxy dll for connecting to CORBA servers.
I want to port this proxy dll to managed, but I can not even compile it in VC 8.0
Please help me.

Thanks very much.

hello there, Have anybody worked with Opencv in .net? this library has a large amount of functions 4 computer vision and image processing, but it supports own type on image (i.e: IplImage), I want to convert this type of images to "bitmap"s in .net, please notify me if such a code exists.

Let's come together to know more!

[Message Deleted]

Use Dependency walker to find out.

Nibu thomas
Software Developer

Dependency Walker[^]

Microsoft introduced a new technology in VS2005, the embedded manifest (I don't know exactly what it is Wink | ;)

). Because of that, it is not possible anymore to ship your external dll with your program.

Maybe this[^] article will help you. I didn't read it so I cannot guarantee that this will solve your problem.