Fortran Use C functions with Watcom Fortran

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Using C functions from Watcom Fortran involves understanding several key aspects of interfacing between the two languages. Important considerations include the calling convention for functions, the structural definition and memory representation of data types, and the argument structure, which pertains to how pointers and various data types (like chars, ints, doubles, etc.) are represented. The standard Windows approach for working with DLLs includes using LoadLibrary to load the DLL and GetProcAddress to retrieve function pointers. The referenced documentation provides insights into different calling conventions and emphasizes the need to convert data structures appropriately, especially when dealing with matrices, as their representation may differ between C and Fortran.
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Is there a way to use C functions from Watcom Fortran?
 
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Take a look at this:

ftp://openwatcom.mirrors.pair.com/archive/11.0c/docs/f77progguide.pdf

The key things just for future notice about using external DLL's written in any language are as follows:

1) Calling convention (for function)
2) Structural definition and memory representation
3) Argument structure (representation of pointers, and machine words like chars, ints, doubles, floats, longs, etc)

The windows standard way of dealing with DLL's is with LoadLibrary for loading the DLL and GetProcAddress to get the function pointer of the DLL.

I had a quick look at the book and it seems to cover the various calling conventions pretty well, but make sure you know how to convert between structures if say a matrix in C is not the same as a matrix in FORTRAN.
 

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