dllexport - Qt and using an existing win32 dll -

i want development work using qt. have built several small apps , followed tutorials. all's fine , seems straight forward.

the development done involves using existing code contained in win32 dlls. want reuse code minimum fuss , link them qt app. have headers, libs , dlls i'll linking @ compile time not dynamically @ runtime.

i have tried qt complains complains link errors similar to: main.obj:-1: error: lnk2019: unresolved external symbol _imp_add referenced in function _main

no matter how tweak .pro file complains.

i've spent many hours googling , found snippets of info. not find 1 answer told whole story. i'm after set of steps, tutorial sequence needs followed. there may example in qt installation examples i've been unable find it.

here simple 'knock-up' i've been trying work in order move on main development. it's based on ms tutorial dll mathsfunc.

the win32 dll:

// visual studio 2005 //funcs.h #ifdef mathfuncs_exports     #define mathfuncsdll_api __declspec(dllexport) #else     #define mathfuncsdll_api __declspec(dllimport)  #endif  #ifdef __cplusplus extern "c" {                    /* assume c declarations c++ */ #endif  // returns + b mathfuncsdll_api double add(double a, double b);   #ifdef __cplusplus }                   /* assume c declarations c++ */ #endif  //funcs.cpp #include "funcs.h"  double add(double a, double b) {     return + b; } 

the qt app imports dll.

//main.cpp #include <qcoreapplication>  #include "../../mathfuncs/funcs.h"  int main(int argc, char *argv[]) {     qcoreapplication a(argc, argv);      double dresult = add(1.0,2.0);      printf("1 + 2 = %f\n",dresult);      return a.exec(); } 

//the qt project file .por

#------------------------------------------------- # # project created qtcreator 2013-03-04t09:16:18 # #-------------------------------------------------  qt       += core  qt       -= gui  target = useit config   += console config   -= app_bundle  template = app  sources += main.cpp  includepath += c:/tmp/mathfuncs  headers += c:/tmp/mathfuncs  libs += c:/tmp/mathfuncs/mathfuncs.lib 

thanks in advance input.

d.