40 lines
1.9 KiB
Plaintext
40 lines
1.9 KiB
Plaintext
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This directory contains two examples of building DLLs. The exe.c and dll.c
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files are used to build a very simple example DLL with a function that
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adds two numbers together (and prints some text at the same time). The
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exe.c program links to the DLL and prints the results of the function
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call.
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The C++ example "silly" is more interesting because it involves a DLL which
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contains the code for a C++ class. The CSilly class has all of its code in
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the sillydll.cpp source file, which is used to build the silly.dll. The
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silly.cpp source code builds the main silly.exe executable which makes a
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dynamic instance of the object and calls its member functions.
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The C++ silly.def file was generated by doing a nm of sillydll.o after it
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was generated and then getting the symbol names from that. Removing the
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leading underscore produces the appropriate name to include in the EXPORTS
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section. Notice there are a few weird functions.
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Since there are now several different versions of the GNU compiler capable
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of doing this, and they each seem to have different requirements for exports
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for classes, it has gotten kind of messy. The silly.def file here is for
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use with the native Mingw32 build of the EGCS version of GCC. The silly.def.old
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file was the def file I used when I was using Jan-Jaap's Mingw32 native port
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of GCC. The Cygnus version is different again, if I recall correctly, but I
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don't have it hanging around anymore.
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The jamfile builds all the components from the raw sources.
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The expected output of exe.exe and silly.exe are in the files exe.exp
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and silly.exp.
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The source code in this directory is in the PUBLIC DOMAIN and can be
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used or abused as you see fit. There is NO WARRANTY for this code,
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including (but not limited to) implied warranties of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE.
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Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
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