C / C++ / MFC Discussion Boards

meirav26-Nov-01 6:57

26-Nov-01 6:57

I have 2 fils in a project :
1 Cpp file and the second C file .
a variable x is declared in the Cpp file and i need that
the C file will "know" that variable.
is there supose to be a problem?
when i tried this:

Cpp File C_File

int x; extern int x
i get an error : unresolved external
I will be very glad to get any help
OMG | :OMG:

Re: common var for C and C++

Joaquín M López Muñoz26-Nov-01 7:09

Joaquín M López Muñoz

26-Nov-01 7:09

Put this in your .h:

#ifdef __cplusplus
extern "C" {
#endif
extern int x;
#ifdef __cplusplus
}
#endif

and this in your .cpp:

#include <···.h>
int x;

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: common var for C and C++

Nish Nishant26-Nov-01 7:11

Nish Nishant

26-Nov-01 7:11

meirav wrote:
int x; extern int x

hmmmm...
dont put both in the same file.

file1.cpp -> declare it there :- int x;
file2.c -> extern "C" int x;

Try that.
Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Radio Box

mvworld26-Nov-01 5:51

mvworld

26-Nov-01 5:51

If I have 2 radio boxes and I want to make sure the user can check only one of them at a time (ie if the user checks one, the other gets automatically unchecked).....then how do I do this?

Thanks.

Re: Radio Box

Nish Nishant26-Nov-01 6:33

Nish Nishant

26-Nov-01 6:33

lets say you have two pairs of 3 radio buttons [thus 6 total].
use the WS_GROUP style for the 1st and 4th.
Now you have two sets of 3-mutually exclusive radio buttons

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Re: Radio Box

26-Nov-01 6:39

If you mean radio buttons, then have them on a group box.

Re: Radio Box

26-Nov-01 7:32

It seems if you place your group boxes with radio buttons in another group box, you can check only one button at a time effectively checking one group at a time. It needs a SetCheck() on the first button you want to start with.

Re: Radio Box

Michael Dunn26-Nov-01 9:40

Michael Dunn

26-Nov-01 9:40

The "group" attribute controls which radio buttons are linked up. It has nothing to do with being in a group box like the previous posts have said. The first radio button must have the group attribute set, the others must not have it set, then the control right after the last radio button in the tab order should have it set to mark the end of the group.

--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
Heart | [heart]

your

with

and

Sonork - 100.10414 AcidHelm

MSXML & VC++ Book

Derek Price26-Nov-01 4:40

Derek Price

26-Nov-01 4:40

Hello,

I am interested in using the MSXML parser using VC++. It seems there are endless books on the subject for VB and every other language, but I haven't been able to find one for VC++ specifically. I know many code sites (MSDN, CodeProject, etc.) have articles, but I would prefer a book. Can anyone suggest a book that focuses on the MSXML parser and VC++ (not .NET)?

Thanks!
Derek

Re: MSXML & VC++ Book

Nish Nishant26-Nov-01 6:47

Nish Nishant

26-Nov-01 6:47

Hi Derek

You are correct there. Nearly all the documentation on MSXML is about VB. I had this same problem an year ago.

I finally ended up using Expat - an XML parser library in C

I believe that since then there is Expat++ which is a C++ class library

I'd recommend Expat unless you very specifically want to use MSXML

Regards
Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Re: MSXML & VC++ Book

Bill Wilson26-Nov-01 7:00

Bill Wilson

26-Nov-01 7:00

I would be suprised to find one. Using it in VC++ is just like using it in VB. Import it, create an instance and call its member functions (just like all other COM objects).

Hope this helps,
Bill

Handle Excel sheet from C++ program

XAlien26-Nov-01 4:24

XAlien

26-Nov-01 4:24

Hi all,
anyone know how to control an Excel sheet (if it is possible), create cells, create table, color it and similar...
thanks a lot. Smile | :)

Re: Handle Excel sheet from C++ program

Nish Nishant26-Nov-01 6:50

Nish Nishant

26-Nov-01 6:50

http://support.microsoft.com/support/kb/articles/q199/6/91.asp

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

How to handle program that I create by ShellExecute

Huu Quynh26-Nov-01 3:39

Huu Quynh

26-Nov-01 3:39

I use ShellExecute to execute IE opens some CGI script like:

HINSTANCE result = ShellExecute(NULL, _T("open"), mUrl, NULL,NULL, cmdshow );

Is it true?
And when I created, the handle is result?
And how to close this dialog by coding in my program?

Please help me! thank you very much!

Re: How to handle program that I create by ShellExecute

Nish Nishant26-Nov-01 6:43

Nish Nishant

26-Nov-01 6:43

The HINSTANCE returned is dummy. Ignore it.
I'd advise you to use ShellExecuteEx

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
Nish is a BIG fan of Goran Ivanisevic

Please Help

26-Nov-01 3:18

Hi folks

I have a guestion, How to save CBitmap object as a bmp file?

Mike

Re: Please Help

Christian Graus26-Nov-01 10:12

Christian Graus

26-Nov-01 10:12

Read the FAQ.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Debug tools

26-Nov-01 3:08

Does anybody knows tools for detecting resource leaks under 9x?

Re: Debug tools

Eugene Pustovoyt26-Nov-01 3:57

Eugene Pustovoyt

26-Nov-01 3:57

You can look at
http://msdn.microsoft.com/msdnmag/issues/01/03/leaks/leaks.asp

I'm use the NuMega DevPartner Studio

I hope, it that is necessary for you!

Best regards,
Eugene Pustovoyt
Big Grin | :-D

Re: Debug tools

26-Nov-01 5:28

10x Eugene,
I suppose you mean Numega BoundsChecker, unfortunatelly it doesn't work under 9x, not even Mutek Bug Trapper Frown | :-(

Dynamic linking

mimi26-Nov-01 2:57

mimi

26-Nov-01 2:57

I have DLL with some functions .
I wrote in vc client program and I need to create Dynamic linking .
How have do it ???

====================================================================
I tried write so :
--------------------
typedef DWORD(SQRTPROC) (DWORD,char*);
HINSTANCE hInstance;
SQRTPROC* pFunc;
VERIFY (hInstance = ::LoadLibrary("c:\\windows\\system\\myDLL.dll"));
VERIFY (pFunc = (SQRTPROC*) ::GetProcAddress(hInstance, "Func1"));

DWORD a = (*pFunc) (1, str); // Call the DLL function
===================================================================
and I got the error :
error LNK2001: unresolved external symbol _Func1@8

Confused | :confused:

Re: Dynamic linking

Joaquín M López Muñoz26-Nov-01 3:53

Joaquín M López Muñoz

26-Nov-01 3:53

Most likely you have left some missing call to Func1() when you decided to switch to dynamic linking. Remember now all calls to this functions must be thru the pointer pFunc. You have two options:

Globally replace all calls to Func1() with appropriate calls to the pointer,
write a little wrapper named Func1 that internally uses the pointer.

Ellaborating on the second solution, you can even consider doing what's called lazy initialization and load the function only when first needed, like this:

DWORD Func1(DWORD dw,char* pch) // wrapper for the real stuff
{
  static SQRTPROC* pFunc=(SQRTPROC*)::GetProcAddress(hInstance, "Func1");
  // this is guaranteed to execute on the first invocation to Func1

  return (*pFunc)(dw,pch);
}

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Dynamic linking. Thanks

26-Nov-01 8:53

Thank you !
I realy have left some missing call to Func1() .
Now it passed compilation successfully.
But I have a new problem with it .
I send it in a new thread.

How to delete some files in system folder

Huu Quynh26-Nov-01 2:53

Huu Quynh

26-Nov-01 2:53

I want to write a VC++ program, that can delete some file in system folder like: C:\\windows\\temporary internet files\0

I use some code like that

SHFILEOPSTRUCT sh;

sh.hwnd = GetSafeHwnd();
sh.wFunc = FO_DELETE;
sh.pFrom = "c:\\windows\\temporary internet files\\*.gif\0";
sh.pTo = NULL;
sh.fFlags = FOF_NOCONFIRMATION | FOF_SILENT;
sh.hNameMappings = 0;
sh.lpszProgressTitle = NULL;

SHFileOperation (&sh);

But happens a error: can not delete file : file system error (1026)

Default Internet Explore is IE. When I use Netscape like default I can delete some files!

Any ideas?

Thank you!

Re: How to delete some files in system folder

Rickard Andersson²⁰26-Nov-01 9:00

Rickard Andersson²⁰

26-Nov-01 9:00

I'm not sure about this but if IE makes the files unwrite able (write protected) the files perhaps wont be deleted. I don't know the SHFileOperation() func so much so I can give you a direct answer! Frown | :(

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