How do I get rid of a DLL out of my project? - C / C++ / MFC Discussion Boards

quailsafe5-Dec-07 12:23

5-Dec-07 12:23

hi,

i would like to use exception handling as a non local goto mechanism so i can implement tail calls, but its very slow (msvc 7.1, release build).

can anybody tell me why, whether this is a blind alley, and how to speed things up if it isn't?

cheers

jono
day-one.com

code follows:
====================================================================================

#include <iostream>

enum{SZ=1000};
int integers[SZ];

using std::ostream;
using std::cout;

struct Continuation
{
Continuation(int cont)
:cont_(cont)
{}

int cont_;
};

ostream &tail_call_helper(ostream &os, int &i)
{
os << integers[i++] << ' ';
if(i < SZ)
{
throw Continuation(i);
}
else
{
// do nothing
}
return os;
}

ostream &tail_call_(ostream &os)
{
int i = 0;
while(true)
{
try
{
tail_call_helper(os, i);
}
catch(Continuation c)
{
i = c.cont_;
continue;
}
break;
}
return os;
}

int main(int argc, char* argv[])
{
tail_call_(cout);

return 0;
}

Re: abusing exceptions

Luc Pattyn5-Dec-07 14:06

Luc Pattyn

5-Dec-07 14:06

Hi,

the first exception when running under Visual Studio is extremely slow.
All others are just slow, because they need to create an exception object (which includes
a stack traceback), then scan the stack for a matching catch.

After all, exceptions are intended to take care of the exceptional case;
for normal cases yes they are a blind alley.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this months tips:
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Re: abusing exceptions

quailsafe5-Dec-07 14:37

quailsafe

5-Dec-07 14:37

thanks for that Luc.

so, any suggestions then? i seem to recall doing something similar to this with setjmp and longjmp a few years ago, but i'd be loath to try it with my boost heavy code.

i'd be interested in any good resources on tail calls in C++. i've found one or two online, but after the first paragraph the discussion degenerates into 'real' languages like lisp & scheme, lol.

cheers
jono

link error [modified]

linksys20065-Dec-07 12:13

linksys2006

5-Dec-07 12:13

pretty simple question, I got the following error message when linking. any one can help on it?

Linking...
mfcs42d.lib(dllmodul.obj) : error LNK2005: _DllMain@12 already defined in Reset.obj
mfcs42d.lib(dllmodul.obj) : warning LNK4006: _DllMain@12 already defined in Reset.obj; second definition ignored
Creating library Debug/Reset.lib and object Debug/Reset.exp
Debug/Reset.dll : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

this is a MFC DLL. If I want to change the link order, the error message only gives me "mfcs42d.lib" and "Reset.obj", doesn't give me the 2nd lib file from "Reset.obj". what shoudl I do? thanks a lot!

modified on Wednesday, December 05, 2007 6:21:19 PM

Re: link error

linksys20065-Dec-07 12:24

linksys2006

5-Dec-07 12:24

I just tried to comment the DllMain() in my cpp file. it passes the link, but I'm not sure it's correct or not. any one can help on it? thanks a lot!

Re: link error

Don Box5-Dec-07 17:41

Don Box

5-Dec-07 17:41

Use /force switch.

Re: link error

linksys20066-Dec-07 12:12

linksys2006

6-Dec-07 12:12

thanks a lot!

How do I get rid of a DLL out of my project?

Tim_at_sbc5-Dec-07 11:32

Tim_at_sbc

5-Dec-07 11:32

I am trying to remove a dll from my project.

There are no more linkages to it within the code. However, if I remove the DLL it bitches when I try to run it. I know I don't need the DLL anymore because I even removed all the exports from the problematic dll and the app still runs.

When I first start to debug it give me the line Loaded symbols for ".....mydll.dll"

I would assume it is just the debugger trying to be cute and load up debug information for my project. Is there a way to clean out its need for this dll?

This is all done with Visual Studio 6 and written in C++.

Re: How do I get rid of a DLL out of my project?

Tim_at_sbc5-Dec-07 12:46

Tim_at_sbc

5-Dec-07 12:46

After four hours of banging I figured it out.

In the project settings under the Debug tab switch the category to Additional DLLs.

Once that category is selected the list of dlls that get loaded at the beginning of a debug session is listed.

I don't know if I put those lines in there or if the system did, but upon them everything seemed fine. In what file do these settings reside? I looked through the .dsp via text editor and saw nothing of this.

Thanks

Re: How do I get rid of a DLL out of my project?

ThatsAlok5-Dec-07 19:46

ThatsAlok

5-Dec-07 19:46

thats why, i prefer the pragma for including dll!(Statically linkage)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
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Map file format

k rentz5-Dec-07 7:58

k rentz

5-Dec-07 7:58

Is the format of the map files produced by Visual Studio documented anywhere? I'm working on a program to find dead code by analyzing map files, and am discovering that there is not much information describing some of the entries. for instance, entries in the address section of the file that start with ? are decorated C++ function names. Entries that start with ??, however, seem to be something different.

Differencies in dataplot between GDI and GDI+ while drawing the same coordinates

JS5-Dec-07 7:04

5-Dec-07 7:04

In a bigger project I found a strange behavior between GDI and GDI+. Drawing some lines with the same coordinates the GDI+ -lines where drawn a little bit lower than the GDI-lines. You can see this after a big zoom (5000 x), see OnInitialUpdate().
I created a MFC-C++ project with a single ScrollView to check this.

If you want to check my project or you have an answer, please send me a mail to

Johannes.Swida@t-online.de

thanks

Code:
void CgdiPlusTestView::OnDraw(CDC* pDC)
{
CgdiPlusTestDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
if (!pDoc)
return;

// draw some lines and a rectangle with alfa-components

SolidBrush cBrush(Color(128, 192, 192, 192));
Pen cPen(Color(255,255, 0, 0),1);
int ii,i;
Point cP[5];
HDC hdc=pDC->m_hDC;

// GDI+
Graphics graphics(hdc);
ii=graphics.SetPageUnit(UnitDisplay);
cP[0].X=295250; cP[0].Y=-506212;
cP[1].X=506559; cP[1].Y=-53058;
cP[2].X=493441; cP[2].Y=-46941;
cP[3].X=282132; cP[3].Y=-500095;
cP[4]=cP[0];
// GDI+ lines and rectangle are together
ii=graphics.FillPolygon(&cBrush,cP,4,FillModeAlternate);
for(i=1;i<5;i++) ii=graphics.DrawLine(&cPen,cP[i-1].X,cP[i-1].Y,cP[i].X,cP[i].Y);

// GDI lines are moved ???
for(i=1;i<5;i++) {
pDC->MoveTo( (int)cP[i-1].X, (int)cP[i-1].Y);
pDC->LineTo( (int)cP[i ].X, (int)cP[i ].Y);
}
}

void CgdiPlusTestView::OnInitialUpdate()
{
CScrollView::OnInitialUpdate();
CSize sizeTotal;
// TODO: Gesamte Größe dieser Ansicht berechnen
sizeTotal.cx = 1485000;
sizeTotal.cy = 1050000;
SetScrollSizes(MM_HIMETRIC, sizeTotal);
}

VC 2008 compiler errors [modified] - SOLVED

Jim Crafton5-Dec-07 4:57

Jim Crafton

5-Dec-07 4:57

I'm trying to compile some code that uses _vsnprintf, and I'm getting errors from the compiler about :

1>regerror.c
1>c:\program files\microsoft visual studio 9.0\vc\include\stdio.h(358) : error C3163: '_vsnprintf': 
attributes inconsistent with previous declaration
1>        c:\program files\microsoft visual studio 9.0\vc\include\stdio.h(350) : 
see declaration of '_vsnprintf'

I have _CRT_SECURE_NO_DEPRECATE, _SCL_SECURE_NO_DEPRECATE, and _CRT_NON_CONFORMING_SWPRINTFS defined.

The code uses it like so:

va_init_list(args, (char* )fmt);
n = vsnprintf((char* )buf, bufsize, (char* )fmt, args);
va_end(args);

where "vsnprintf" is actually a macro defined as :

#define vsnprintf   _vsnprintf

To the best of my knowledge this has worked fine with *all* previous compilers MS C++ compilers, so I'm stumped at what to do here.

Bah!! Turns out there is now a vsnprintf function, so it's a non-issue - I just needed to comment the #define out for VC9 compilers.

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modified on Wednesday, December 05, 2007 11:33:23 AM

Re: VC 2008 compiler errors [modified] - SOLVED

toxcct5-Dec-07 5:59

toxcct

5-Dec-07 5:59

Jim, how have you solved it ?
what was the problem actually ?

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

backup network files - problem

sgeocla5-Dec-07 3:58

sgeocla

5-Dec-07 3:58

I am developing an application that is trying to backup (BackupRead, BackupWrite) a file from the network. The process has SE_RESTORE_NAME and SE_BACKUP_NAME privileges set. Creating the backup file is successful but I'm having problems restoring it. When I try to use GetFileAttributes on the folder in whitch I'm trying to restore the file, it fails and GetLastError returns ERROR_INTERNAL_ERROR (1359) for a network share with full access to everyone and returns ERROR_PATH_NOT_FOUND (3) if the share is mounted as a mapped drive. I also cannot create files from my program, but I can create them in windows explorer.
Are there more privileges that I need to set? Am I doing something wrong?
Please help

How do I load another programs Icon?

RichardS715-Dec-07 2:23

RichardS71

5-Dec-07 2:23

Hi All,

What I'm trying to do is implement in c++ a routine that loads another programs icon without loading that program. What api does windows explorer use to do it?

Any help would be greatly appreciated

Regards

RichardS71

Re: How do I load another programs Icon?

David Crow5-Dec-07 2:27

David Crow

5-Dec-07 2:27

Have you considered ExtractIcon()?

"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

Re: How do I load another programs Icon?

Iain Clarke, Warrior Programmer5-Dec-07 3:36

Iain Clarke, Warrior Programmer

5-Dec-07 3:36

Grr - I knew there had to be a simple function.

not LoadIcon, not ExtractResource...

I started thinking about LoadLibrary, FindResource etc...

Then I sae you'd already replied with the perfect answer.

Sometimes "we" can be too clever for our own good.

Iain.

Re: How do I load another programs Icon?

RichardS715-Dec-07 4:43

RichardS71

5-Dec-07 4:43

I haven't tried it yet but I've looked at the api and I believe it to be what I was looking for.
I've been Googling all kinds of search criteria looking for this answer.... so many thanks for your help.

Regards

RichardS71 Smile | :)

CInternetSession Problem

Amar Sutar5-Dec-07 1:15

Amar Sutar

5-Dec-07 1:15

Hi,

I am writing an appliction which downloads MJPEG stream from IP camera. My application supports many IP cameras at a time. So i need to download several URL at a time from single instance. But the problem is when I add my fifth camera my application gets hanged. So is there any limit on how many URLs we can open using CInternetSession's OpenURL method? From my application I am able to open upto 4 URLs for one instance. For fifth URL my application give "timeout" exception.

Code:

CStdioFile* m_pFile[5];
CInternetSession m_inetSession[5];

for(int iIndex = 0; iIndex < 5; ++iIndex)
{
m_pFile[iIndex] = m_inetSession[iIndex].OpenURL (cstrUrl, 1, INTERNET_FLAG_TRANSFER_BINARY | INTERNET_FLAG_RELOAD);
.
.
}

Thanks in Advance.

Amar Smile | :)

Re: CInternetSession Problem

David Crow5-Dec-07 2:30

David Crow

5-Dec-07 2:30

Since CInternetSession class is a wrapper around InternetOpenUrl(), you could temporarily change your code to use InternetOpenUrl() instead. When/if it fails, you can call GetLastError() to find out why.

Re: CInternetSession Problem

Amar Sutar5-Dec-07 17:22

Amar Sutar

5-Dec-07 17:22

GetLastError() returns error code 12002.

Re: CInternetSession Problem

Mark Salsbery6-Dec-07 3:31

Mark Salsbery

6-Dec-07 3:31

From the docs:

ERROR_INTERNET_TIMEOUT
12002
The request has timed out.

Are you sure the URL is valid?

Mark

Mark Salsbery
Microsoft MVP - Visual C++

Java | [Coffee]

Re: CInternetSession Problem

Amar Sutar6-Dec-07 4:15

Amar Sutar

6-Dec-07 4:15

Yes it is a Valid URL.

Struct or class?

George_George5-Dec-07 0:50

George_George

5-Dec-07 0:50

Hello everyone,

Multiplies is a struct, why MSDN said it is a class?

http://msdn2.microsoft.com/en-us/library/a5hwk3ay(VS.80).aspx

thanks in advance,
George

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