Re: C to C++ link error - C / C++ / MFC Discussion Boards

spiritualfields9-Oct-03 5:39

9-Oct-03 5:39

I've been downloading some projects from the site, the latest one being the grid control, and keep getting this error during linking of the project (in vc 6.0):

Linking...
LINK : fatal error LNK1104: cannot open file "mfc42u.lib"
Error executing link.exe.

I only have mfc42.lib. What do I have to do to fix this?

Ed

Re: mfc42u.lib ?

W. Hammer -sledge-9-Oct-03 6:04

W. Hammer -sledge-

9-Oct-03 6:04

The u stands for unicode.
You have to change the configuration of your project to win32release or win32debug.
Another way to fix this will be installing the unicode versions of mfc.

Hope this helps
sledge

Re: mfc42u.lib ?

Garth J Lancaster9-Oct-03 17:49

Garth J Lancaster

9-Oct-03 17:49

'Sledge' is correct, you can change the project settings to not use Unicode builds ... but if you HAVE to use Unicode, and have the Visual Studio Install/MSVC 6 install CDROM, run setup, select Customised install, you should then be able to select Unicode components

(been a while since I had to do it, so those instructions are a bit rusty, but that's the general technique)

'G'

Re: mfc42u.lib ?

speedo21shree14-Oct-10 23:11

speedo21shree

14-Oct-10 23:11

Hi..I am also new in vc++, I faced this problem and I solve it...
Follow the step:
1:Search(find) MFC42U.LIB file from the Installation CD
2:Copy the file
3:Paste into the VC\Lib files
no issue..at all...

C to C++ link error

jimNLX9-Oct-03 5:05

jimNLX

9-Oct-03 5:05

I'm trying to convert a C program into a VC++ program and have everything compiling but I get a ton of Link errors.

The error I get is:
error LNK2005: ... already defined in ...

I'm getting 230+ of these error and don't really know why. I've used #pragam once in all the headers, but still get this error.

Any help on this error or converting C to C++?

Thanks,

Jim

Re: C to C++ link error

Joaquín M López Muñoz9-Oct-03 7:51

Joaquín M López Muñoz

9-Oct-03 7:51

Does the symbol correspond to a global variable? Something like this?

int global;

If so, try writing this in the .h file:

extern int global;

and then this in just one .cpp:

int global=0;

If this works and you're curious, I can try to explain the reason of your problem.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: C to C++ link error

jimNLX9-Oct-03 7:57

jimNLX

9-Oct-03 7:57

It's defined in a header with the extern key word.

Re: C to C++ link error

jimNLX9-Oct-03 8:02

jimNLX

9-Oct-03 8:02

Here is what is defined in the header file:

#ifdef ELABORATE_ALL_VARIABLES
D2N_GLBL_STRUCT *D2N_GLBL;

void D2N_GLBL_Elab( void );
void D2N_GLBL_Elab( void )
{
D2N_GLBL = (D2N_GLBL_STRUCT *) calloc( sizeof(D2N_GLBL_STRUCT), 1);
}

#else
extern D2N_GLBL_STRUCT *D2N_GLBL;
#endif

Re: C to C++ link error

Joaquín M López Muñoz9-Oct-03 8:06

Joaquín M López Muñoz

9-Oct-03 8:06

remove extern D2N_GLBL_STRUCT *D2N_GLBL;

??????? What is that remove thing? Could you explain what this file (is it a header?) is supposed to do, and what role does the macro ELABORATE_ALL_VARIABLES play?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: C to C++ link error

jimNLX9-Oct-03 8:16

jimNLX

9-Oct-03 8:16

I wish I knew, but I've never seen the program run before! I'm just having to port it to C++.

The remove was something I forgot to remove when debugging.

I think that this Macro does two different things based on what function is using it.

Re: C to C++ link error

Joaquín M López Muñoz9-Oct-03 8:24

Joaquín M López Muñoz

9-Oct-03 8:24

Ok. We can try to make an educated guess Smile | :)

My opinion is that the header is used both for declaring things and for defining them. The second use is activated by ELABORATE_ALL_VARIABLES. Let's say the header is called a.h: then I guess you have to #include it like always everywhere except in the one file a.cpp, where you should have to write:

// a.cpp
#define ELABORATE_ALL_VARIABLES
#include "a.h"
... // rest of stuff

or, alternatively, define this macro for a.cpp in the properties section of the file (Fileview pane->right click on a.cpp->Settings->Preprocessor definitions).
Good luck. Let me know if I can give you more assistance.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

resizing of dialog boxes

b_girl9-Oct-03 4:06

b_girl

9-Oct-03 4:06

I was wondering if it was at all possible, when 'maximizing' a dialog box, to make it so that it doesn't cover up the main menubar? When my dialog box maximizes itself, I want it to maximize to the size of the parent frame (if that's what the part below the menubar is called). Is this possible, if so, how?

Re: resizing of dialog boxes

Ravi Bhavnani9-Oct-03 7:36

Ravi Bhavnani

9-Oct-03 7:36

You can resize your dialog to its parent's client area, which you can get by calling GetClientRect(). You'll probably need to convert the rect to screen coordinates before resizing your dialog. Something like this (untested!):

CMyDialog::doMaximize()
{
  CRect rect;
  GetParent()->GetClientRect (&rect);
  ClientToScreen (&rect);
  MoveWindow (&rect);
}

/ravi

Let's put "civil" back in "civilization"
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ravib@ravib.com

Re: resizing of dialog boxes

b_girl9-Oct-03 8:17

b_girl

9-Oct-03 8:17

Thanks.

changing language

dudic9-Oct-03 3:44

dudic

9-Oct-03 3:44

How to change language using VC++: for example, my windows XP is french and to read and use programs oriented for another language I have to perform a long operation of changing default language on my system. Where can I find information about this?

Re: changing language

Atif Mushtaq10-Oct-03 0:12

Atif Mushtaq

10-Oct-03 0:12

User LoadKeyBoardLayout API
By Setting the appropriate langauge Id to this APi One can switch between different langauge
Atif

detecting network computers

YanivNahum9-Oct-03 2:36

YanivNahum

9-Oct-03 2:36

Hi there,
How can I detect all the computers conected to my local network.
tnx
Yaniv Confused | :confused:

Re: detecting network computers

David Crow9-Oct-03 3:13

David Crow

9-Oct-03 3:13

Start with WNetOpenEnum().

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Listbox help

NewHSKid9-Oct-03 1:41

NewHSKid

9-Oct-03 1:41

Hi all,

I posted this a couple days ago but didn't get any response. Thought i would try to post it again and see if someone could help.

Wanted to know if it is possible to both pad a hex numbers with leading 0's and also format the width of the message.

I have a string and i just concat a hex number to it. I just want to space out the numbers so that they will line up with the next string added, so that it has the look of a table.

Right now i am padding the hex number like this:

int myString = 10005;
int myString2 = 20003;
testStr.Format("%03X" , myString);
Str += testStr;
testStr.Format("%03X" , myString2);
Str += testStr;
Listbox.AddString(Str);

I know if i take away the 0, then it will set the width, but i need to do both. CAN THIS BE DONE?

thanks in advance.

Jimmy

Just cause I am 15, doesn't mean I'm dumb! (I'll really be 4 on Feb. 29...the year 2004)

Re: Listbox help

jhwurmbach9-Oct-03 1:57

jhwurmbach

9-Oct-03 1:57

NewHSKid wrote:
Wanted to know if it is possible to both pad a hex numbers with leading 0's and also format the width of the message.

Sure: You know the width of your column, the length of your hex number, and the difference of both is the number of leading '0' you have to prepend.

Who is 'General Failure'? And why is he reading my harddisk?!?

Re: Listbox help

Steve S9-Oct-03 2:02

Steve S

9-Oct-03 2:02

You could do it in two stages, format the hex value, then take that as further input to another Format call, using %8.8s (pad on right) or %-8.8s (pad on left) as the format string second time around

eg
testStr1.Format("%03X",myString);
testStr2.Format("%03X",myString2);
Str.Format("%10.10s%10.10s",testStr1,testStr2);

Steve S
I was 15 once. It was a long time ago.
Today, it's 22 years since I started working full-time in IT.

Re: Listbox help

Steve S9-Oct-03 2:05

Steve S

9-Oct-03 2:05

and, (haven't used Format or printf for a while...) you can specify the field width as an argument itself, like this;

testStr.Format("%0*X", n, myString)
where n is the number of digits you want.

Steve S

Vector inside MFC app?

Zizilamoroso9-Oct-03 1:00

Zizilamoroso

9-Oct-03 1:00

How can I use vector.h in an MFC app?

class_a.cpp:

<br />
#include "stdafx.h"<br />
#include "class_b.h"<br />

class_b.h:

<br />
#include "vector"<br />

class_b.cpp:

<br />
#include "stdafx.h><br />
#include "class_b.h"<br />

There's no code yet.

Compiling class_b.cpp is no problem.

But compiling class_a results in a whole bunch of compiler errors (inside new.h, memory.h, ...). I think it has something to do with namespaces, but I'm not sure. I'm not declaring nor using namespaces of my own. Could also be an debug/release prob.

These are (part of) the errors:

<br />
vc98\include\new(35) : error C2061: syntax error : identifier 'THIS_FILE'<br />
vc98\include\new(35) : error C2091: function returns function<br />
vc98\include\new(35) : error C2809: 'operator new' has no formal parameters<br />
vc98\include\new(36) : error C2061: syntax error : identifier 'THIS_FILE'<br />
vc98\include\new(37) : error C2091: function returns function<br />
vc98\include\new(37) : error C2556: 'void *(__cdecl *__cdecl operator new(void))(unsigned int,const struct std::nothrow_t &)' : overloaded function differs only by return type from 'void *(__cdecl *__cdecl operator new(void))(unsigned int)'<br />
vc98\include\new(35) : see declaration of 'new'<br />
...

What do I have to do?

using: [VISUAL STUDIO 6.0 sp5] [WIN98/2]

Re: Vector inside MFC app?

Anand Paranjpe9-Oct-03 1:47

Anand Paranjpe

9-Oct-03 1:47

hi,
Add code below in in stdafx.h

include <vector>
using namespace std;

This will do.
Cheers Smile | :)

Anand

The chosen One Smile | :)

Re: Vector inside MFC app?

Steve S9-Oct-03 1:51

Steve S

9-Oct-03 1:51

You might want to make sure the #include >vector< appears before the block that reads

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

in all your files. One way to do this would be to put the #include inside stdafx.h instead.

Steve S

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