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How do I export a function in C++?

What do you want to do?

  1. Export from a DLL using .def files.
  2. Export from a DLL using __declspec(dllexport)
  3. Export and import using AFX_EXT_CLASS.
  4. Export C functions for use in C or C++-language executables.
  5. Determine which exporting method to use.
  6. Import into an application using __declspec(dllimport)
  7. Initialize a DLL.

What is extern C Declspec Dllexport?

Exporting from a DLL Using __declspec(dllexport) __declspec(dllexport) adds the export directive to the object file so you do not need to use a . def file. This convenience is most apparent when trying to export decorated C++ function names. def file does not cause build errors.

What is Dllexport C?

__declspec(dllexport) The dllexport storage-class attribute is used for Microsoft C and C++ language compatibility. This attribute enables you to export functions, data, and objects from a DLL.

How do I create a .DLL file?

Add the names of the functions to be exported to this file. For non-MFC DLLs, create the DEF file yourself and add it to your project. Then go to Project > Properties > Linker > Input > Module Definition File and enter the name of the DEF file.

What does export command do in Unix?

In general, the export command marks an environment variable to be exported with any newly forked child processes and thus it allows a child process to inherit all marked variables.

Can DLL export classes?

Microsoft Specific You can declare C++ classes with the dllimport or dllexport attribute. These forms imply that the entire class is imported or exported. Classes exported this way are called exportable classes.

How to export functions from a DLL in Visual C + +?

Visual C++: Exporting functions from a DLL using “__declspec (dllexport)” keyword. Once the exported functions are identified, you can export from a DLL in two ways. One is by using “.def” file and another one is using the keyword “__declspec(dllexport)”. You can use either one to export the functions from a DLL.

What is the exports table of a DLL?

The exports table contains the name of every function that the DLL exports to other executables. These functions are the entry points into the DLL; only the functions in the exports table can be accessed by other executables. Any other functions in the DLL are private to the DLL.

How to export functions from C to C + +?

If you have functions in a DLL written in C that you want to access from a C language or C++ language module, you should use the __cplusplus preprocessor macro to determine which language is being compiled, and then declare these functions with C linkage if being used from a C++ language module.

How to export code from a DLL-codeproject?

The XyzLibrary project exports its code with the following handy macro: The XYZLIBRARY_EXPORT symbol is defined only for the XyzLibrary project, so the XYZAPI macro expands into __declspec (dllexport) for the DLL build and into __declspec (dllimport) for the client build.