Re: error LNK2019: unresolved external symbol

From:

"lalo" <helene.ayari@gmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

28 Jul 2006 01:25:58 -0700

Message-ID:

<1154075158.418282.84780@i42g2000cwa.googlegroups.com>

Hi,

Here are the command lines for the compilation of the programm:
/Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "#define NOMINMAX" /D
"_AFXDLL" /D "_UNICODE" /D "UNICODE" /Gm /EHsc /RTC1 /MDd /Zc:wchar_t-
/Yu"stdafx.h" /Fp"Debug\essai_acquisition2.pch" /Fo"Debug\\"
/Fd"Debug\vc80.pdb" /W3 /nologo /c /ZI /TP /errorReport:prompt

Here are the command line for linking:
/OUT:"C:\Documents and Settings\hdelanoe\Mes documents\Visual Studio
2005\Projects\essai_acquisition2\Debug\essai_acquisition2.exe" /NOLOGO
/MANIFEST
/MANIFESTFILE:"Debug\essai_acquisition2.exe.intermediate.manifest"
/NODEFAULTLIB:"msvcrt.lib" /DEBUG /PDB:"c:\Documents and
Settings\hdelanoe\Mes documents\Visual Studio
2005\Projects\essai_acquisition2\debug\essai_acquisition2.pdb"
/SUBSYSTEM:CONSOLE /MACHINE:X86 /ERRORREPORT:PROMPT " ipl98_visualc.lib
1394camera.lib cameras_ipl98.lib

Here is the main code of the programm:
// essai_acquisition2.cpp : Defines the entry point for the console
application.
//

#include "stdafx.h"
#include <camera/camera_firewire/camera_firewire_cmu.h>
#include <ipl98/cpp/image.h>
#include <camera/camera_firewire/cmu/1394Camera.h>

#include <string>
#include <ostream>
#include <istream>
#include <iostream>
#include <limits>
#include <cctype>
#include <sstream>
#include <cstdio>
#include <sstream>

using namespace ipl;
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    if (argc!=2)
    {
        ////cout << "ERROR - needs number of image to grab as argument" <<
endl;
        return 1;
    }
    unsigned int TotalImages;
    //sscanf(argv[1],"%d",&TotalImages);
    //cout << "Total images to grab: " << TotalImages << endl;
    CImage Img;
    ostringstream ost;
    CCameraFirewireCMU Cam;

    Cam.Initialize();
    //cout << endl << "Camera successfully selected, current settings: "
<< endl;
    Cam.GetCurrentSettings(ost);
    //cout << ost.str() << endl;
    ost.str("");
    string FilePrefix("Image_");
    // grab image from each camera
    for(int i=0; i<TotalImages;i++)
    {
        Cam.Acquire(Img);
        //ost << FilePrefix << setfill('0') << std::setw(4) << i << ".bmp";
        //Img.Save(ost.str().c_str());
        //cout << "Saved image: " << ost.str() << endl;
        //ost.str("");
    }
    //std::cout << "Finished...(press return)" << std::endl;
    if (getchar()){}
    return true;
}

That is the definition of

ostream& operator<<( ostream&, char const*);

that is missing. The only way I can imagine to get this error is to
explicitly not link to the C++ standardlibrary, but that requires some
effort.

I thought this definition was included in <ostream> which is called
(see program above)
here what my <ostream> says
#ifdef _DLL
#pragma warning(disable:4231) /* the extern before template is a
non-standard extension */

extern template _CRTIMP basic_ostream<char, char_traits<char> >&
__cdecl operator<<(
       basic_ostream<char, char_traits<char> >&, const char *);
extern template _CRTIMP basic_ostream<char, char_traits<char> >&
__cdecl operator<<(
       basic_ostream<char, char_traits<char> >&, char);
extern template _CRTIMP basic_ostream<char, char_traits<char> >&
__cdecl operator<<(
       basic_ostream<char, char_traits<char> >&, const signed char *);
extern template _CRTIMP basic_ostream<char, char_traits<char> >&
__cdecl operator<<(
       basic_ostream<char, char_traits<char> >&, const signed char);
extern template _CRTIMP basic_ostream<char, char_traits<char> >&
__cdecl operator<<(
       basic_ostream<char, char_traits<char> >&, const unsigned char
*);
extern template _CRTIMP basic_ostream<char, char_traits<char> >&
__cdecl operator<<(
       basic_ostream<char, char_traits<char> >&, const unsigned char);
extern template _CRTIMP basic_ostream<wchar_t, char_traits<wchar_t> >&
__cdecl operator<<(
       basic_ostream<wchar_t, char_traits<wchar_t> >&, const wchar_t
*);
extern template _CRTIMP basic_ostream<wchar_t, char_traits<wchar_t> >&
__cdecl operator<<(
       basic_ostream<wchar_t, char_traits<wchar_t> >&, wchar_t);
extern template _CRTIMP basic_ostream<wchar_t, char_traits<wchar_t> >&
__cdecl operator<<(
       basic_ostream<wchar_t, char_traits<wchar_t> >&, const signed
short *);

#pragma warning(default:4231) /* restore previous warning */
#endif // _DLL

Thanks again
Helene