std::string link error

[ankireddy26]

Hi,

i am using VC6 with STL port and ImageMagick (Another library for Image processing).

I configured everything with STLPort and when i run i am getting the following error.

inking...
With50View.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: void __thiscall Magick::Image::read(class _STL::basic_string<char,class _STL::char_traits<char>,class _STL::allocator<char> > const &)" (__imp_?read@Image@Magi
ck@@QAEXABV?$basic_string@DV?$char_traits@D@_STL@@V?$allocator@D@2@@_STL@@@Z)
Release/With50.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

( i uncommented _STLP_NO_OWN_IOSTREAMS in stl_user_config.h file)

I think the error is because, the image read function required std::string as input but in this case it is looking with STLPort::string.

Can anyone help me how to solve this?

Thanks in advance
ankdireddy

[Alvaro]

i am using VC6 [...]

Why?

[chrisadam]

You're mixing object files compiled with VS 2008 and VS 2010. This is forbidden when using the C++ Standard Library. (Unfortunately, we can't emit a nice linker error in this scenario, although we will when mixing 2010 and post-2010.)

The symptom is the linker error complaining about std::basic_string and __declspec(dllimport). In VS 2010, std::basic_string isn't marked __declspec(dllimport) anymore. Therefore, if the linker is complaining like this, you're picking up VS 2008's headers somehow (whether in this compilation, or with a separately compiled object file). You can compile with /showIncludes to see what headers are getting dragged in. Since Acquisition_Imaging.obj is looking for __declspec(dllimport) std::basic_string, it's almost certainly one of the offending object files.

[jennyfer99]

thank for explanation chrisadam, information you've provided cleared everything