Re: Unresolved External Symbols ---- Using .Lib - C / C++ / MFC Discussion Boards

Re: Unresolved External Symbols ---- Using .Lib

Django_Untaken27-Jan-14 23:41

27-Jan-14 23:41

The error is till there.

However, I thank for the time you have spent answering me. One thing that may be of interest to you, I am using the library in a c++ project.

Re: Unresolved External Symbols ---- Using .Lib

Jochen Arndt28-Jan-14 0:15

Jochen Arndt

28-Jan-14 0:15

Where did you get the library from? Or did you build it yourself?

I ask this because a wrong library file is the last possible answer I can give you.
You can check the symbols that are exported by a library with the dumpbin utility:

dumpbin /exports filename

To use dumpbin from a command shell, open the command shell and execute vcvars32.bat which is located in the VC\bin directory of your Visual Studio installation.

Re: Unresolved External Symbols ---- Using .Lib

Vaclav_3-Feb-14 4:38

Vaclav_

3-Feb-14 4:38

Jochen,
since the VC 6.0 wizard does not give the /VERBOSE option, at least I counld not find it, could you give me some advice were in the .DSP file is the safe place to add it ?
I'll check the compiler doc to get more info on the option.
Thanks
Vaclav

Never mid - found it under Link -> Print progress messages

Re: Unresolved External Symbols ---- Using .Lib

Jochen Arndt3-Feb-14 4:59

Jochen Arndt

3-Feb-14 4:59

Vaclav_Sal wrote:
I'll check the compiler doc to get more info on the option.

It is a linker option, not a compiler option. So you might have looked at the wrong place.

When adding the command to the DSP file, the place should not care as long as the command is correct. But the VC 6 project settings should provide an input field for user defined linker options where you can enter the option (with more recent VC versions it is 'Additional Options' on the Linker - Command Line tab).

Re: Unresolved External Symbols ---- Using .Lib

Albert Holguin29-Jan-14 18:09

Albert Holguin

29-Jan-14 18:09

Django_Untaken wrote:
Apparently it means that it cann't find avcodec.h

Not really... it means it can't find the object... in another words, there's nothing that matches that prototype (a lib is a collection of objects).

Happen to browse this:
http://libav.org/platform.html#Linking-to-Libav-with-Microsoft-Visual-C_002b_002b[^]

Re: Unresolved External Symbols ---- Using .Lib

Richard Andrew x6428-Jan-14 5:40

Richard Andrew x64

28-Jan-14 5:40

Along with "Additional Include Directories," there is also an "Additional Library Directories" option that you must set if the .lib file is not located in the project directory.

The difficult we do right away...
...the impossible takes slightly longer.

Re: Unresolved External Symbols ---- Using .Lib

bling28-Jan-14 12:51

bling

28-Jan-14 12:51

If you're using a C library from C++, you may need to wrap the include directive inside an extern "C" clause like ...

extern "C" {
#include "libxxxxx.h"
}

Re: Unresolved External Symbols ---- Using .Lib

Stefan_Lang30-Jan-14 1:20

Stefan_Lang

30-Jan-14 1:20

Django_Untaken wrote:
I am trying to use xxxx.lib file and all of it's xxxx.h
[...]
What setting am I missing?

Have you checked the parental control setting? Poke tongue | ;-P

Sorry, couldn't stop myself. Can't really offer any advice beyond that already given. Wink | ;)

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

VC2008 Feature Pack Problem

shanmugarajaa26-Jan-14 22:13

shanmugarajaa

26-Jan-14 22:13

Dear folks,

Requirement is to Improve the application GUI So I have used VC2008 Feature Pack version 9.0.30411.0 and obtained the desired looks. But Now the problem is, If I run the application exe in target PC which feature pack is not installed. Then I'm unable to run the application due to feature pack is not get installed in target PC.

Normally we do, if I incorporate new component like "MSFlexGride", then the appropriate OCX file is added in the installation procedure. But In this case I couldn't find out related "DLL" or "OCX" files.

Kinldy help me to fix this problem.

Re: VC2008 Feature Pack Problem

Richard MacCutchan27-Jan-14 1:32

Richard MacCutchan

27-Jan-14 1:32

I think you need to check the notes at http://www.microsoft.com/en-gb/download/details.aspx?id=6922[^] for pre-requisites and redistribution requirements. Please note also that this is a Visual Studio question rather than C++.

Veni, vidi, abiit domum

Re: VC2008 Feature Pack Problem

CPallini27-Jan-14 2:07

CPallini

27-Jan-14 2:07

You have several options and Google lists them all[^].

Veni, vidi, vici.

Re: VC2008 Feature Pack Problem

bob1697227-Jan-14 11:18

bob16972

27-Jan-14 11:18

try statically linking to the C-Runtime, ATL, and MFC...

-Change C++/Code Generation/Runtime Library from /MD to /MT.
-Change General/Use of ATL/ to "Static Link to ATL"
-Change General/Use of MFC/ to "Use MFC in a static Library"

TrackMouseEvent

BarryPearlman26-Jan-14 12:00

BarryPearlman

26-Jan-14 12:00

I am trying to use TrackMouseEvent with a button on a dialog box created using the Resource Editor. I have tried the various sample codes examples available here on this site and on the internet.

I get some results, but not all. I keep coming up with references to subclassing the button in the literature, yet I do get WM_MOUSEMOVE & WM_MOUSELEAVE messages. When I try to subclass the button, I get an error which I interpret to mean that the button is already sub classed.

Isn't the button automatically subclassed when you use the template generated by the Resource Editor? If not and the button has to be subclassed, how do I do this.

Thanks,

Barry

Re: TrackMouseEvent

David Crow26-Jan-14 16:57

David Crow

26-Jan-14 16:57

BarryPearlman wrote:
If not and the button has to be subclassed, how do I do this.

Subclassing Controls. Also check here.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

C vs. C++ (VS2010)

vesf26-Jan-14 7:29

vesf

26-Jan-14 7:29

I hope I chose an appropriate forum. Why does the test code below build in VS2010 as C code but not as C++ code (linker errors further below). And what's needed to make it compile as C++ code. Thanks. - Vince

C++

#include <stdlib.h>

__declspec(dllimport) int __stdcall SetEnvironmentVariableA(const char *pName, const char *pValue);
__declspec(dllimport) unsigned long __stdcall GetEnvironmentVariableA(const char *pName, char *pValue, unsigned long nSize);

int main ( int argc, char **argv )
{
	char szValue[32768];
	SetEnvironmentVariableA(argv[1], argv[2]);
	GetEnvironmentVariableA(argv[1], szValue, 32768);
	return 0;
}

C++

error LNK2001: unresolved external symbol "__declspec(dllimport) unsigned long __stdcall GetEnvironmentVariableA(char const *,char *,unsigned long)" (__imp_?GetEnvironmentVariableA@@YGKPBDPADK@Z)
error LNK2001: unresolved external symbol "__declspec(dllimport) int __stdcall SetEnvironmentVariableA(char const *,char const *)" (__imp_?SetEnvironmentVariableA@@YGHPBD0@Z)

Re: C vs. C++ (VS2010)

vesf26-Jan-14 9:22

vesf

26-Jan-14 9:22

Got it! 'extern "C"' needed. I missed that when tracking down the defines and typedefs in WinBase.h.

Re: C vs. C++ (VS2010)

Mauro Leggieri26-Jan-14 9:25

Mauro Leggieri

26-Jan-14 9:25

Put declarations inside

extern "C" { }

C & C++ uses different name mangling.

Message Closed

25-Jan-14 23:32

sayanlsen

25-Jan-14 23:32

Message Closed

Re: Action With Royal Rumble

CPallini26-Jan-14 0:45

CPallini

26-Jan-14 0:45

What has to do with C++ (reported as spam)?

Veni, vidi, vici.

Re: Action With Royal Rumble

Marco Bertschi26-Jan-14 10:04

Marco Bertschi

26-Jan-14 10:04

Nothing, apparently.

Veni, vidi, caecus | Everything summarizes to Assembly code

About pthread scheduling (C programming)

Member 1037526524-Jan-14 1:33

Member 10375265

24-Jan-14 1:33

I am a student at the american university of engineering (SFAX, Tunisia) .
I am having a project about "simulating a thread scheduler with pthread" .
Really , I found several problems :
1- Is the thread lifecycle is the same as linux thread lifecyle ?
2- Can I implement my own scheduling algorithm or I must use the explicit scheduling of pthreads like (set_sched_param, ...) ??
3 - Is there a way to trace process scheduling (graphically) using C ??

Please reply asap , it's an urgent project !
Thanks Smile | :)

Re: About pthread scheduling (C programming)

Richard MacCutchan24-Jan-14 2:45

Richard MacCutchan

24-Jan-14 2:45

See http://msdn.microsoft.com/en-us/library/windows/desktop/ms684841(v=vs.85).aspx[^].

Veni, vidi, abiit domum

Re: About pthread scheduling (C programming)

CPallini24-Jan-14 3:10

CPallini

24-Jan-14 3:10

The OP is asking about POSIX threads, I believe.

Veni, vidi, vici.

Re: About pthread scheduling (C programming)

Richard MacCutchan24-Jan-14 4:56

Richard MacCutchan

24-Jan-14 4:56

Veni, vidi, abiit domum

Re: About pthread scheduling (C programming)

CPallini24-Jan-14 2:52

CPallini

24-Jan-14 2:52

Quote:
1- Is the thread lifecycle is the same as linux thread lifecyle ?

Probably I didn't get you. Linux provides POSIX threads. That is you have to use pthreads for multithreading on Linux. In other words, don't bother about Linux threads, let's be focused on pthreads.

Quote:
2- Can I implement my own scheduling algorithm or I must use the explicit scheduling of pthreads like (set_sched_param, ...) ??

I suppose you have to implement your own scheduling algorithm. After all that's the title of your project. However you should ask to your tutor.

Quote:
3 - Is there a way to trace process scheduling (graphically) using C ??

Since you are providing the scheduling then yes, there must be a way (that is your scheduling code should provide the necessary info to build the graph. You probably have to use a library for the graphical interface (have a look at this SO question[^], for an overview).

Veni, vidi, vici.

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