Overloaded Operator Causes Unresolved External Symbol

This is a discussion on Overloaded Operator Causes Unresolved External Symbol within the C++ Programming forums, part of the General Programming Boards category; Once again I seem to be having unresolved external symbol errors for no reason. Here are the errors: Code: 1>Main.obj ...

  1. #1
    Registered User mikeman118's Avatar
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    Overloaded Operator Causes Unresolved External Symbol

    Once again I seem to be having unresolved external symbol errors for no reason. Here are the errors:
    Code:
    1>Main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: class std::basic_istream<char,struct std::char_traits<char> > & __thiscall std::basic_istream<char,struct std::char_traits<char> >::seekg(long,enum std::ios_base::seekdir)" (__imp_?seekg@?$basic_istream@DU?$char_traits@D@std@@@std@@QAEAAV12@JW4seekdir@ios_base@2@@Z) referenced in function "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl read(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?read@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V12@@Z)
    1>Main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall std::basic_ifstream<char,struct std::char_traits<char> >::open(char const *,int)" (__imp_?open@?$basic_ifstream@DU?$char_traits@D@std@@@std@@QAEXPBDH@Z) referenced in function "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl read(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?read@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V12@@Z)
    1>Main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall std::basic_ofstream<char,struct std::char_traits<char> >::basic_ofstream<char,struct std::char_traits<char> >(char const *,int)" (__imp_??0?$basic_ofstream@DU?$char_traits@D@std@@@std@@QAE@PBDH@Z) referenced in function "bool __cdecl write(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?write@@YA_NV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@0@Z)
    1>Main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl std::operator<<<char,struct std::char_traits<char> >(class std::basic_ostream<char,struct std::char_traits<char> > &,char const *)" (__imp_??$?6DU?$char_traits@D@std@@@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@PBD@Z) referenced in function "public: bool __thiscall File::Erase(void)" (?Erase@File@@QAE_NXZ)
    1>Main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall std::basic_ifstream<char,struct std::char_traits<char> >::basic_ifstream<char,struct std::char_traits<char> >(char const *,int)" (__imp_??0?$basic_ifstream@DU?$char_traits@D@std@@@std@@QAE@PBDH@Z) referenced in function "public: bool __thiscall Money_Tracker::Initialize(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct HWND__ *)" (?Initialize@Money_Tracker@@QAE_NV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAUHWND__@@@Z)
    The problem is stemming from where I use a class and I have an overloaded operator. However, even
    Code:
    cout << "Something or other";
    doesn't work. I've tried reinstalling Visual Studio, and the Platform SDK, but to no avail. Can anyone help me?

  2. #2
    Cat without Hat CornedBee's Avatar
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    Have you tried starting over with a clean project?
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  3. #3
    CSharpener vart's Avatar
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    What VS? VS6?
    Have you checked in the Option/Directories
    that Bin/Include/Lib all have Platform SDK paths as a first choice?
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  4. #4
    Registered User mikeman118's Avatar
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    I have tried making a new project, although I'll try again because I may have changed something...
    I have all of the platform SDK paths setup too, and I'm using Visual Studio 2008.

  5. #5
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    Visual Studio 2008 comes with the platform sdk i believe.

  6. #6
    Cat without Hat CornedBee's Avatar
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    Express does not, but that's irrelevant. These linker errors are against the C++ standard library.

    Could be a mismatch between DLL-linking compiler flags but LIB-linking linker flags. But I have no idea how you'd get there.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  7. #7
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    The problem is stemming from where I use a class and I have an overloaded operator.
    So it works if you remove the class with the overloaded operator? Which operator are you overloading? Is it << or >> ?

  8. #8
    Registered User mikeman118's Avatar
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    In fact I'm using both the << and >> operator. Here's the definition for one of the classes:
    Code:
    class Output
    {
    public:
    	int iWindowName;
    	HWND hwnd;
    	Output (void);
    	Output (int windowName, HWND hWnd) {
    		iWindowName = windowName;
    		hwnd = hWnd;
    	}
    	bool operator <<(std::string out);
    	bool operator <<(int out);
    	bool operator <<(double out);
    	Output operator ()(int windowName)
    	{
    		iWindowName = windowName;
    		return *this;
    	}
    	Output operator ()(HWND hWnd, int windowName)
    	{
    		iWindowName = windowName;
    		hwnd = hWnd;
    		return *this;
    	}
    } Cout;
    (This code is for simplifying outputting text to other windows). However, like I mentioned it's not only my class that causes the error.

  9. #9
    CSharpener vart's Avatar
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    Shouldn't operator << return reference to the current instance?
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  10. #10
    Cat without Hat CornedBee's Avatar
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    The stream variants, yes, but these are his own overloads, so they can return whatever he wants.

    But this has nothing to do with the linker errors, which are for the standard library streams.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  11. #11
    Registered User mikeman118's Avatar
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    I just tried the following:
    Code:
    #include <iostream>
    #include <fstream>
    using namespace std;
    
    
    int main()
    {
    	cout << "hi";
    	return 0;
    }
    And it gives me the following error:
    Code:
    1>Tests.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl std::operator<<<char,struct std::char_traits<char> >(class std::basic_ostream<char,struct std::char_traits<char> > &,char const *)" (__imp_??$?6DU?$char_traits@D@std@@@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@0@AAV10@PBD@Z) referenced in function _main
    I have no idea what the problem is, but I'm considering completely removing VC++ from my computer and reinstalling it.

  12. #12
    Cat without Hat CornedBee's Avatar
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    That sounds like a good idea. It seems like you've picked up some weird project defaults somewhere.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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