LNK2019 Basler Pylon API in Visual Studio 2015 [duplicate] - c++

Question

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What is an undefined reference/unresolved external symbol error and how do I fix it?
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I know LNK2019 is related to unlinked librarys. I know the drill -> Linker - > Input -> Additional Dependencies. I've done that with the libs provided by Basler (HERE). FYI Basler is a camera manufacturer and i need to talk to the camera via their c++ API.
I wanted to start today with a new project and thought it would be a good start to compile their 'grab a single frame' sample file.
Well in Linux with g++ everything works like a charm and compiling is a thing of a minute but sadly i need Windows for this project for stupid reasons.
I'm working on this now for 4 hours and i'm beginning to go crazy.
Help is much appreciated. Here is the Main File and all Project Info from Visual Studio:
// Grab.cpp
/*
Note: Before getting started, Basler recommends reading the Programmer's Guide topic
in the pylon C++ API documentation that gets installed with pylon.
If you are upgrading to a higher major version of pylon, Basler also
strongly recommends reading the Migration topic in the pylon C++ API documentation.
This sample illustrates how to grab and process images using the CInstantCamera class.
The images are grabbed and processed asynchronously, i.e.,
while the application is processing a buffer, the acquisition of the next buffer is done
in parallel.
The CInstantCamera class uses a pool of buffers to retrieve image data
from the camera device. Once a buffer is filled and ready,
the buffer can be retrieved from the camera object for processing. The buffer
and additional image data are collected in a grab result. The grab result is
held by a smart pointer after retrieval. The buffer is automatically reused
when explicitly released or when the smart pointer object is destroyed.
*/
// Include files to use the PYLON API.
#include <pylon/PylonIncludes.h>
#ifdef PYLON_WIN_BUILD
# include <pylon/PylonGUI.h>
#endif
// Namespace for using pylon objects.
using namespace Pylon;
// Namespace for using cout.
using namespace std;
// Number of images to be grabbed.
static const uint32_t c_countOfImagesToGrab = 100;
int main(int argc, char* argv[])
{
// The exit code of the sample application.
int exitCode = 0;
// Automagically call PylonInitialize and PylonTerminate to ensure the pylon runtime system
// is initialized during the lifetime of this object.
Pylon::PylonAutoInitTerm autoInitTerm;
try
{
// Create an instant camera object with the camera device found first.
CInstantCamera camera( CTlFactory::GetInstance().CreateFirstDevice());
// Print the model name of the camera.
cout << "Using device " << camera.GetDeviceInfo().GetModelName() << endl;
// The parameter MaxNumBuffer can be used to control the count of buffers
// allocated for grabbing. The default value of this parameter is 10.
camera.MaxNumBuffer = 5;
// Start the grabbing of c_countOfImagesToGrab images.
// The camera device is parameterized with a default configuration which
// sets up free-running continuous acquisition.
camera.StartGrabbing( c_countOfImagesToGrab);
// This smart pointer will receive the grab result data.
CGrabResultPtr ptrGrabResult;
// Camera.StopGrabbing() is called automatically by the RetrieveResult() method
// when c_countOfImagesToGrab images have been retrieved.
while ( camera.IsGrabbing())
{
// Wait for an image and then retrieve it. A timeout of 5000 ms is used.
camera.RetrieveResult( 5000, ptrGrabResult, TimeoutHandling_ThrowException);
// Image grabbed successfully?
if (ptrGrabResult->GrabSucceeded())
{
// Access the image data.
cout << "SizeX: " << ptrGrabResult->GetWidth() << endl;
cout << "SizeY: " << ptrGrabResult->GetHeight() << endl;
const uint8_t *pImageBuffer = (uint8_t *) ptrGrabResult->GetBuffer();
cout << "Gray value of first pixel: " << (uint32_t) pImageBuffer[0] << endl << endl;
#ifdef PYLON_WIN_BUILD
// Display the grabbed image.
Pylon::DisplayImage(1, ptrGrabResult);
#endif
}
else
{
cout << "Error: " << ptrGrabResult->GetErrorCode() << " " << ptrGrabResult->GetErrorDescription() << endl;
}
}
}
catch (GenICam::GenericException &e)
{
// Error handling.
cerr << "An exception occurred." << endl
<< e.GetDescription() << endl;
exitCode = 1;
}
// Comment the following two lines to disable waiting on exit.
cerr << endl << "Press Enter to exit." << endl;
while( cin.get() != '\n');
return exitCode;
}
Included LibrariesFolder (Linker->Additional Dependencies):
"C:\pylon\pylon\lib\Win32";"
C:\pylon\genicam\library\cpp\lib\win32_i86"
They exist. I've checked that.
Output from Compiler:
1>------ Build started: Project: Grab, Configuration: Debug Win32 ------
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall Pylon::PylonAutoInitTerm::PylonAutoInitTerm(void)" (__imp_??0PylonAutoInitTerm#Pylon##QAE#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall Pylon::PylonAutoInitTerm::~PylonAutoInitTerm(void)" (__imp_??1PylonAutoInitTerm#Pylon##QAE#XZ) referenced in function __catch$_main$0
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall Pylon::CDeviceInfo::CDeviceInfo(void)" (__imp_??0CDeviceInfo#Pylon##QAE#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class GenICam::gcstring __thiscall Pylon::CDeviceInfo::GetModelName(void)const " (__imp_?GetModelName#CDeviceInfo#Pylon##QBE?AVgcstring#GenICam##XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall Pylon::CDeviceInfo::~CDeviceInfo(void)" (__imp_??1CDeviceInfo#Pylon##UAE#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: static class Pylon::CTlFactory & __cdecl Pylon::CTlFactory::GetInstance(void)" (__imp_?GetInstance#CTlFactory#Pylon##SAAAV12#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: bool __thiscall Pylon::CGrabResultData::GrabSucceeded(void)const " (__imp_?GrabSucceeded#CGrabResultData#Pylon##QBE_NXZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class GenICam::gcstring __thiscall Pylon::CGrabResultData::GetErrorDescription(void)const " (__imp_?GetErrorDescription#CGrabResultData#Pylon##QBE?AVgcstring#GenICam##XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: unsigned int __thiscall Pylon::CGrabResultData::GetErrorCode(void)const " (__imp_?GetErrorCode#CGrabResultData#Pylon##QBEIXZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: unsigned int __thiscall Pylon::CGrabResultData::GetWidth(void)const " (__imp_?GetWidth#CGrabResultData#Pylon##QBEIXZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: unsigned int __thiscall Pylon::CGrabResultData::GetHeight(void)const " (__imp_?GetHeight#CGrabResultData#Pylon##QBEIXZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void * __thiscall Pylon::CGrabResultData::GetBuffer(void)const " (__imp_?GetBuffer#CGrabResultData#Pylon##QBEPAXXZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall Pylon::CGrabResultPtr::CGrabResultPtr(void)" (__imp_??0CGrabResultPtr#Pylon##QAE#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall Pylon::CGrabResultPtr::~CGrabResultPtr(void)" (__imp_??1CGrabResultPtr#Pylon##QAE#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class Pylon::CGrabResultData * __thiscall Pylon::CGrabResultPtr::operator->(void)const " (__imp_??CCGrabResultPtr#Pylon##QBEPAVCGrabResultData#1#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall Pylon::CGrabResultPtr::operator struct Pylon::IImage &(void)const " (__imp_??BCGrabResultPtr#Pylon##QBEAAUIImage#1#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall Pylon::CInstantCamera::CInstantCamera(struct Pylon::IPylonDevice *,enum Pylon::ECleanup)" (__imp_??0CInstantCamera#Pylon##QAE#PAUIPylonDevice#1#W4ECleanup#1##Z) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall Pylon::CInstantCamera::~CInstantCamera(void)" (__imp_??1CInstantCamera#Pylon##UAE#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual void __thiscall Pylon::CInstantCamera::StartGrabbing(unsigned int,enum Pylon::EGrabStrategy,enum Pylon::EGrabLoop)" (__imp_?StartGrabbing#CInstantCamera#Pylon##UAEXIW4EGrabStrategy#2#W4EGrabLoop#2##Z) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual bool __thiscall Pylon::CInstantCamera::RetrieveResult(unsigned int,class Pylon::CGrabResultPtr &,enum Pylon::ETimeoutHandling)" (__imp_?RetrieveResult#CInstantCamera#Pylon##UAE_NIAAVCGrabResultPtr#2#W4ETimeoutHandling#2##Z) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual bool __thiscall Pylon::CInstantCamera::IsGrabbing(void)const " (__imp_?IsGrabbing#CInstantCamera#Pylon##UBE_NXZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual class Pylon::CDeviceInfo const & __thiscall Pylon::CInstantCamera::GetDeviceInfo(void)const " (__imp_?GetDeviceInfo#CInstantCamera#Pylon##UBEABVCDeviceInfo#2#XZ) referenced in function _main
1>Grab.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) void __cdecl Pylon::DisplayImage(unsigned int,struct Pylon::IImage const &)" (__imp_?DisplayImage#Pylon##YAXIABUIImage#1##Z) referenced in function _main
1>C:\path-to\Grab.exe : fatal error LNK1120: 23 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Pls can somebody tell me, what is going on ?

Answer 1

The linker is trying to compile your application, but cannot as it doesn't know what the various Pylon functions refer to as you haven't used the PylonBase_MD_VC100.lib library.
You may think you have, but you haven't. Let's explain why:
Included LibrariesFolder (Linker->Additional Dependencies):
"C:\pylon\pylon\lib\Win32";"
C:\pylon\genicam\library\cpp\lib\win32_i86"
They exist. I've checked that.
Well, no. You need to point the compiler to the file of the library (in this case, PylonBase_MD_VC100.lib), the folder won't suffice. Link to the library, and it'll work:
Linker->Additional Dependencies > Add the PylonBase_MD_VC100.lib library
OR
#prama comment(lib, "PylonBase_MD_VC100.lib") at the beginning of your code, just below any #includes
The following sample from the MSDN KB article on this issue will guarantee a LNK2019 error:
// LNK2019.cpp
// LNK2019 expected
extern char B[100]; // B is not available to the linker
int main() {
B[0] = ' ';
}