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- Installing a dll file how to#
- Installing a dll file .dll#
- Installing a dll file install#
- Installing a dll file full#
See the Deployment documentation for more details on shared and static builds.In this Installing VST plugins on windows tutorial, we will cover an easy step by step tutorial guide explaining what to do to install the VST plugins to your workstation (PC) The disadvantage is that the executables are large. The advantage is that you will only have a few files to deploy. Static linking results in a stand-alone executable. lib files, if you don't have access to those, then QLibrary is an alternative.
Installing a dll file .dll#
dll or just standard linking, depends on whether you have access to the headers and the. On the plus side, applications and libraries linked against a shared library are small. When creating a shared library, you need to deploy it with your application. Which approach to choose depends on your needs. You need to specify what files you want to copy with $$OUT_PWD and where you want to put them by using $$QT_INSTALL_HEADERS and $$QT_INSTALL_LIBS.įor more information, see Installing Files. prl CONFIG(release, debug|release) : libraryFiles. LibraryFiles.path = $$ CONFIG(debug, debug|release) : libraryFiles. Since we are doing this on Windows we also must explicitly export the function from the DLL using Q_DECL_EXPORT and Q_DECL_IMPORT. This means that the functions must be wrapped in an extern "C" block if the library is compiled with a C++ compiler. For the function names to be resolvable, they must be exported as C functions (i.e., without name mangling) from the library.
Installing a dll file how to#
The following example shows how to set up a library for usage with QLibrary. In this case you only need access to the. QLibrary can be used for loading shared libraries at runtime. Using QLibrary to load the shared library Note that for Unix/Linux systems the library file name is case sensitive, but for Windows you have to leave in all lower case.
Installing a dll file full#
$$PWD is used here to specify the full path leading to the directory containing your. Win32 : CONFIG ( release, debug | release): LIBS += - L$$ PWD/ build- MyLibrary/ - lmylibrary else : win32: CONFIG ( debug, debug | release): LIBS += - L$$ PWD/ build- MyLibrary/ - lmylibrary else : unix: LIBS += - L$$ PWD/ build- MyLibrary/ - lMyLibrary INCLUDEPATH += $$PWD/build-MyLibrary In addition you need to ensure that the shared library is found by either putting it in the application's directory or in the global PATH on windows and the LD_LIBRARY_PATH on linux. The INCLUDEPATH needs to point to the directory where the headers are installed, and the LIBS variable needs to point to the directory of the import library file. You need to inform qmake where to find the headers and the library. To set this up, you have to modify your application's. At runtime this loads the shared library (. Also you need to link against the import library file (. In order to use the shared library in your application, you can include the headers of your library in your code and use the methods/classes from there.
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Linking your application against the shared library See also the documentation on Creating Shared Libraries. They are needed to link your code against the library. This can be done using Q_DECL_EXPORT and Q_DECL_IMPORT as shown in the following example: Subsequently imported when you are linking against the library. When creating a shared library that you would like to link against, then you need to ensure that the symbols that are going to be used outside the library are properly exported when the library is created. To organize a bigger project with libraries and executables, take a look at SUBDIRS - handling dependencies Creating a shared library The second part is about creating and using a static library. The first part explains how to create a shared library and how to link against it in your application. This tutorial illustrates different approaches for using a custom library in your application on Windows.