Thread: [Dev-C++] Linking problems

Hello,

I get the following linker messages when compiling the program below :

c:\dev-c++\projets\wininet\fetchtext\fetchtext1.o: In function `main':
//c/dev-c++/projets/wininet/fetchtext/fetchtext1.cpp:15: undefined =
reference to `InternetOpenA@20'
//c/dev-c++/projets/wininet/fetchtext/fetchtext1.cpp:19: undefined =
reference to `InternetCloseHandle@4'

Can you see anything wrong with my code? What does 'undefined reference' =
mean?

Many thanks.

Philippe de Rochambeau

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Program =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

#include <windows.h>
#include <wininet.h>
#include <iostream>
#include <string>
using namespace std;

#define BUFFLEN 255

int main()
{

   string m_strURL =3D "http://localhost";
   string m_strResult;

   HINTERNET hSession =3D InternetOpen("FetchText1", =
INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);

   if (hSession) {

      InternetCloseHandle(hSession);

   }

return 0;

=20

Hallo,

I try to build a small application that uses windows funtions that are 
not in the standard libs but are in the libs of the MS SDK.
I did set the path to the libs and also the name of the lib I want to 
link with, but I get the following log

Compiler: Default compiler
Building Makefile: "C:\Dev-Cpp\Andreas\wtshost\Makefile.win"
Führt  make... aus
make.exe -f "C:\Dev-Cpp\Andreas\wtshost\Makefile.win" all
gcc.exe main.o  -o "wtshost.exe" -L"C:/Dev-Cpp/lib" 
-L"C:/Programme/Microsoft Platform SDK/Lib/" -mwindows -l 
"C:/Programme/Microsoft Platform SDK/Lib/WtsApi32.Lib"

C:\Dev-Cpp\Bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\mingw32\bin\ld.exe: 
cannot find -lC:/Programme/Microsoft Platform SDK/Lib/WtsApi32.Lib
collect2: ld returned 1 exit status

make.exe: *** [wtshost.exe] Error 1

I am sure the path is OK.
I tried with the -L phat and -lWtsApi32.Lib without the full path, but I 
get the same error.
What's wrong in my projec tconfiguration ?

Bye
Andreas

Hi Andreas,
 
The only thing that I can obviously see is the text:
-lC:/Programme/Microsoft Platform SDK/Lib/WtsApi32.Lib
 
As gcc is using the Unix convention for path names, the spaces in the path name will cause a problem.  Try single quoting it as -l'C:/Programme/Microsoft Platform SDK/Lib/WtsApi32.Lib'.   If that doesn't work, just physically copy it to the lib folder of dev-cpp.
 
The other possibility is that if you're adding this to the to the linker parameters with the -l, that -l tries to add the prefix lib and suffix .a to the library, making it actually libWtsApi32.Lib.a which won't be found.  As an example my use of -lgimp-2.0 in Project Options->Parameters->Linker actually refers to libgimp-2.0.dll.a in the default lib directory.

Andreas Moroder <and...@sb...> wrote:
Hallo,

I try to build a small application that uses windows funtions that are 
not in the standard libs but are in the libs of the MS SDK.
I did set the path to the libs and also the name of the lib I want to 
link with, but I get the following log

Compiler: Default compiler
Building Makefile: "C:\Dev-Cpp\Andreas\wtshost\Makefile.win"
Führt make... aus
make.exe -f "C:\Dev-Cpp\Andreas\wtshost\Makefile.win" all
gcc.exe main.o -o "wtshost.exe" -L"C:/Dev-Cpp/lib" 
-L"C:/Programme/Microsoft Platform SDK/Lib/" -mwindows -l 
"C:/Programme/Microsoft Platform SDK/Lib/WtsApi32.Lib"

C:\Dev-Cpp\Bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\mingw32\bin\ld.exe: 
cannot find -lC:/Programme/Microsoft Platform SDK/Lib/WtsApi32.Lib
collect2: ld returned 1 exit status

make.exe: *** [wtshost.exe] Error 1

I am sure the path is OK.
I tried with the -L phat and -lWtsApi32.Lib without the full path, but I 
get the same error.
What's wrong in my projec tconfiguration ?

Bye
Andreas



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Alfred P. Reaud
 

Alfred P. Reaud schrieb:
> Hi Andreas,
>  
> The only thing that I can obviously see is the text:
> -lC:/Programme/Microsoft Platform SDK/Lib/WtsApi32.Lib
>  
> As gcc is using the Unix convention for path names, the spaces in the 
> path name will cause a problem.  Try single quoting it as 
> -l'C:/Programme/Microsoft Platform SDK/Lib/WtsApi32.Lib'.   If that 
> doesn't work, just physically copy it to the lib folder of dev-cpp.
>  
> The other possibility is that if you're adding this to the to the linker 
> parameters with the -l, that -l tries to add the prefix lib and suffix 
> .a to the library, making it actually libWtsApi32.Lib.a which won't be 
> found.  As an example my use of -lgimp-2.0 in Project 
> Options->Parameters->Linker actually refers to libgimp-2.0.dll.a in the 
> default lib directory.
Hello Alfred,

I copied the file to the lib directory,

but now i get this error

main.o(.text+0x33):main.c: undefined reference to `WTSEnumerateSessionsA@20'
main.o(.text+0x4b):main.c: undefined reference to `WTSFreeMemory@4'
collect2: ld returned 1 exit status

any hint ?

Bye
Andreas

Hi,
I'm not sure, but I think that you must enter path to 
C:\Programme\Microsoft Platform SDK\Lib
and
C:\Programme\Microsoft Platform SDK\Include
in the Dev-Cpp. You can do this by clicking on the Tools / Compiler 
Options menu. Go to "Directories" tab and "Libraries" and "C Includes" 
(or "C++ Includes") sub-tabs.

Good luck,
Blagoja

> Hi,
> I'm not sure, but I think that you must enter path to 
> C:\Programme\Microsoft Platform SDK\Lib
> and
> C:\Programme\Microsoft Platform SDK\Include
> in the Dev-Cpp. You can do this by clicking on the Tools / Compiler 
> Options menu. Go to "Directories" tab and "Libraries" and "C Includes" 
> (or "C++ Includes") sub-tabs.
> 
> Good luck,
> Blagoja

I forget,
You can do this also in the Project / Project Options menu.
In the "Directories" tab.

Blagoja

Blagoja Gjakovski schrieb:
>> Hi,
>> I'm not sure, but I think that you must enter path to=20
>> C:\Programme\Microsoft Platform SDK\Lib
>> and
>> C:\Programme\Microsoft Platform SDK\Include
>> in the Dev-Cpp. You can do this by clicking on the Tools / Compiler=20
>> Options menu. Go to "Directories" tab and "Libraries" and "C Includes"=
=20
>> (or "C++ Includes") sub-tabs.
>>
>> Good luck,
>> Blagoja
>=20
>=20
> I forget,
> You can do this also in the Project / Project Options menu.
> In the "Directories" tab.
>=20
> Blagoja
>=20
>=20
Hello Blagoja,

I had already set the path in my project. Now I did delete it from there=20
and put it into the compiler options.
The linker finds the library I have set as parameter in the=20
project/options/parameters/linker ( -lwtsApi32  )
I am sure because if I change this name I get the error that the file=20
was not found

Now it continues to tell me that there is a undefined reference
to `WTSEnumerateSessionsA@20' even if the function I use is
WTSEnumerateSessionsA

Does the compiler mangle the names the way that they are different than=20
the icrosoft one ?
Is mangling not used only in c++, my project is c

Bye
Andreas

here the output

Compiler: Default compiler
Building Makefile: "C:\Dev-Cpp\Andreas\wtshost\Makefile.win"
F=FChrt  make... aus
make.exe -f "C:\Dev-Cpp\Andreas\wtshost\Makefile.win" all
gcc.exe main.o  -o "wtshost.exe" -L"C:/Dev-Cpp/lib"=20
-L"C:/Programme/Microsoft Platform SDK/Lib" -mwindows -lwtsApi32

main.o(.text+0x33):main.c: undefined reference to `WTSEnumerateSessionsA@=
20'
main.o(.text+0x4b):main.c: undefined reference to `WTSFreeMemory@4'
collect2: ld returned 1 exit status

make.exe: *** [wtshost.exe] Error 1

Ausf=FChrung beendet

Ok, but you must follow this procedure:

Insert this Paths in Tools / Compiler Options / Directories / Libraries
"C:\Dev-Cpp\lib
C:\Programme\Microsoft Platform SDK\Lib"

Insert this Paths in Tools / Compiler Options / Directories / C Includes 
"C:\Dev-Cpp\include
C:\Programme\Microsoft Platform SDK\Include"

Insert this Paths in Project / Project Options / Directories / Library 
Directories
"C:\Dev-Cpp\lib
C:\Programme\Microsoft Platform SDK\Lib"

Insert this Paths in Project / Project Options / Directories / Include 
Directories
"C:\Dev-Cpp\include
C:\Programme\Microsoft Platform SDK\Include"

Insert this Paths in Project / Project Options / Parameters / Linker
"C:/Programme/Microsoft Platform SDK/Lib/WtsApi32.Lib"

Execute batch file "SetEnv.Cmd" in C:\Programme\Microsoft Platform SDK\

In "main.c" file insert this:
#include "WtsApi32.h"
or full path
#include "C:/Programme/Microsoft Platform SDK/Include/WtsApi32.h"


Thats all,
Blagoja

>
> Hello,
>
> I get the following linker messages when compiling the
> program below :
>
> c:\dev-c++\projets\wininet\fetchtext\fetchtext1.o: In
> function `main':
> c/dev-c++/projets/wininet/fetchtext/fetchtext1.cpp:15:
> undefined reference to `InternetOpenA@20'
> c/dev-c++/projets/wininet/fetchtext/fetchtext1.cpp:19:
> undefined reference to `InternetCloseHandle@4'
>
> Can you see anything wrong with my code? What does
> 'undefined reference' mean?
>

If your source code is in no project, add it to a new project. Then try
adding the following to the "project options/further object files or
linker options":

-lwininet