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Thread: Linker errors with simple QDirIterator program (which libs to invlude?)

  1. 10th September 2011, 22:44 #1
    prophetjohn
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    Default Linker errors with simple QDirIterator program (which libs to invlude?)

    Hi, folks, new to Qt. I'm working on updating an application that performs a special kind of comparison on images and my job is to integrate functionality that automates this over a whole directory. It looks like Qt's QDirIterator library is more robust and much better documented than Boost's filesystem (which I already have working), so I want to get this working in Qt, but I'm getting linker errors when compiling this in VC++ '08. This is, of course, just a trivial application to print the names of the files so I can get a feel for the library. Any insight into which libs I should include?

    Qt Code: 
    1. void show_files(const string &path)
    2. {
    3.     QDir directory;
    4.     QString str = QString::fromStdString(path);
    5.     directory.setPath(str);
    6.     string fileName = "",
    7.            direc = directory.path().toStdString(),
    8.            ext;
    9.  
    10.     int num_files_seen = 0;
    11.  
    12.     if ( directory.exists() )
    13.     {
    14.         QDirIterator i(directory);
    15.  
    16.         while( i.hasNext() )
    17.         {
    18.             if( i.fileInfo().isDir() )
    19.                 direc = i.fileInfo().path().toStdString();
    20.             else
    21.             {
    22.                 fileName = i.fileInfo().fileName().toStdString();
    23.                 ext = i.fileInfo().suffix().toStdString();
    24.                 cout << fileName << " is in " << direc
    25.                      << " and has the file extension " << ext << endl;
    26.                 num_files_seen++;
    27.             }
    28.         }
    29.     }
    30.     cout << num_files_seen << " seen.\n";
    31. }
    32.  
    33.  
    34. 1>------ Build started: Project: iter, Configuration: Debug Win32 ------
    35. 1>Linking...
    36. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QDir::~QDir(void)" (__imp_??1QDir@@QAE@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    37. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall QDirIterator::~QDirIterator(void)" (__imp_??1QDirIterator@@UAE@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    38. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class QString __thiscall QFileInfo::suffix(void)const " (__imp_?suffix@QFileInfo@@QBE?AVQString@@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    39. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class QString __thiscall QFileInfo::fileName(void)const " (__imp_?fileName@QFileInfo@@QBE?AVQString@@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    40. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class QString __thiscall QFileInfo::path(void)const " (__imp_?path@QFileInfo@@QBE?AVQString@@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    41. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QFileInfo::~QFileInfo(void)" (__imp_??1QFileInfo@@QAE@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    42. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: bool __thiscall QFileInfo::isDir(void)const " (__imp_?isDir@QFileInfo@@QBE_NXZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    43. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class QFileInfo __thiscall QDirIterator::fileInfo(void)const " (__imp_?fileInfo@QDirIterator@@QBE?AVQFileInfo@@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    44. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: bool __thiscall QDirIterator::hasNext(void)const " (__imp_?hasNext@QDirIterator@@QBE_NXZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    45. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QDirIterator::QDirIterator(class QDir const &,class QFlags<enum QDirIterator::IteratorFlag>)" (__imp_??0QDirIterator@@QAE@ABVQDir@@V?$QFlags@W4IteratorFlag@QDirIterator@@@@@Z) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    46. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: bool __thiscall QDir::exists(void)const " (__imp_?exists@QDir@@QBE_NXZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    47. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall QString::toStdString(void)const " (__imp_?toStdString@QString@@QBE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    48. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class QString __thiscall QDir::path(void)const " (__imp_?path@QDir@@QBE?AVQString@@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    49. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall QDir::setPath(class QString const &)" (__imp_?setPath@QDir@@QAEXABVQString@@@Z) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    50. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: static class QString __cdecl QString::fromStdString(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (__imp_?fromStdString@QString@@SA?AV1@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    51. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QString::~QString(void)" (__imp_??1QString@@QAE@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    52. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QDir::QDir(class QString const &)" (__imp_??0QDir@@QAE@ABVQString@@@Z) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    53. 1>iter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QString::QString(void)" (__imp_??0QString@@QAE@XZ) referenced in function "void __cdecl show_files(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?show_files@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
    54. 1>C:\Users\Josh\Documents\Visual Studio 2008\Projects\/bin/iterd.exe : fatal error LNK1120: 18 unresolved externals
    55. 1>Build log was saved at "file://C:\Users\Josh\Documents\Visual Studio 2008\Projects\Build\iter\Debug\BuildLog.htm"
    56. 1>iter - 19 error(s), 0 warning(s)
    57. ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
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    Thanks!
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  2. 12th September 2011, 07:18 #2
    ChrisW67
    ChrisW67 is offline Guru
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    Default Re: Linker errors with simple QDirIterator program (which libs to invlude?)

    QDir and friends are part of the same library as QString (also failing): QtCore

    Are you linking against Qt libraries built with VC 2008?
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