![]() ![]() Recall our definition of the mean subroutine was: function mean(xc, n) bind(c)ĬGCC$ ATTRIBUTES STDCALL, DLLEXPORT :: mean The first step is to create prototype calls for our Fortran subroutines. This option should present a BASIC editor for defining our routines. Next, we'll need a new "Module" for our routines, which can be added by selecting "Module" from the Insert menu. This should open the Visual Basic for Applications editor: To get started on writing this glue, we need to open Excel's VBA editor, accessible either with the Alt-F11 hotkey or clicking "Visual Basic" under the Developer menu. This BASIC code is necessary to define the interface to the DLL, transform the input data properly, and expose functions to the Excel worksheet. We first need a small amount of glue in the form of Visual Basic for Applications, or VBA, code. To keep this explanation simple, though, we'll proceed with interfacing with our averaging procedures.Ī Fortran DLL, or any DLL for that manner, isn't directly interfaced with Excel. Our Fortran DLL contained three functions for computing three types of averages, but countless, more complicated use cases exist. Therefore, we can take another step and call said DLL from Microsoft Office Excel.Įxcel spreadsheets are often used for data analysis, and, occasionally, when non-trivial analyses are necessary, Fortran may make life a bit easier. As stated in the article, the resulting DLL was entirely standards-compliant: it utilized proper calling conventions and it exported the functions we wished to expose. In the last blog post, we created a simple dynamic link library for Windows that was easily callable from C, including Microsoft's Visual C++.
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