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I am building an app using qgis in Windows 7 with VS 2008. It was diagnosed that I must have the wrong versions of the libraries because of a potential name mangling problem. I have 12 unresolved externals and I can find them in gis_core by micreosoft name. Does anyone have a different library for me to link to?

  • Can you please add what library you are currently using to the question – Kelso Dec 12 '12 at 3:50
  • I am using the lib called c:\OSgeo4W\apps\qgis\lib\qgis_core.lib. It is dated with a create date of 11/13/2012. I downloaded it from the OSGeo4W site and the link on the main page, trac.osgeo.org/osgeo4w. I am not sure how to get the original version number of it. It is not included in the file properties. – Tygh Porak Dec 12 '12 at 4:19
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Does your project have the option Treat wchar_t as a built-in type turned on?

Assuming QGIS is built against a default version of Qt on Windows, Qt has Treat wchar_t as a built-in type turned off. So the library you're linking with probably has no idea what wchar_t is

Another thing to note is that Qt is more than just a C++ library/framework. It uses its own pre-compiler (moc) to set up reflection and signals/slots in your classes. If you created your project in raw Visual Studio, it won't know to run moc against your code first before compiling it. Whereas QtCreator or a project created by Qt's Visual Studio addin does.

  • Yes, you are right the Treat wchar_t as a built-in type was turned on. I turned it off and still the same results. The same unresolved symbols. – Tygh Porak Dec 12 '12 at 6:16
  • I did a little more digging and found that I have 2 types of unresolved symbols. At least one is coming from QT. I also found a link that talks of the same problem. "Unresolved external symbol "staticMetaObject". Since I am not building the qtcore4 library myself, I would not know where to change. This is the only QT library I am linking to. I tried versions 4.8.4 & 4.6.4. – Tygh Porak Dec 12 '12 at 6:24
  • The other commonality of symbol types are ones that include VERSION_INT as part of the name. example: QgsApplication::mGdalSkipListVERSION_INT – Tygh Porak Dec 12 '12 at 6:29
  • Updated answer to cover Qt's moc – jumpinjackie Dec 12 '12 at 9:43
  • Thank you. Actually I am not atempting to write a QT plugin and not sure why the references were called for by the linker. What I am trying to do is write a custom dll that currently handles device control bt needs to run a good dissolve routine on a basic shape file. I posted my current code segment in the question "How do I add QGIS dissolve function to my C++ Windows ATL program." – Tygh Porak Dec 13 '12 at 4:51

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