From: Alexander Lehmann Newsgroups: comp.os.msdos.djgpp Subject: Re: Dynamic loading of functions Date: 14 Feb 1997 16:25:46 GMT Organization: Technische Hochschule Darmstadt Lines: 35 Message-ID: <5e23ma$p39@rs18.hrz.th-darmstadt.de> References: NNTP-Posting-Host: fb0403.mathematik.th-darmstadt.de To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Lennart Steinke wrote: : Hi! : I'm currently playing with the idea of loading function dynamically : (for plug ins). It's working, but I've some questions: : 1) Do I have to lock the memory of the funtion after loading or : not? : 2) Are there already libs for djgpp which allow dynamic binding? There is a rather simple dynamic loader in the for of .dxe files (mainly used for the FPU-emulator) that allows loading a program piece that doesn't have any external references (libraries etc) and just a single entry point. It takes care of relocating the code to the new location and all. Since it doesn't handle references, it would be necessary to return a struct that contains function pointers to all available functions and variables (and probably pass one for functions in the main program), which would make porting a library to dxe a bit difficult (could be done with cpp directives, though). Maybe it would be better to write a full-fleged dll or so-like library support, but this would be much more complicated, of course (but would be a very welcome addition to djgpp, I think). bye, Alexander PS. i saw a commercial solution for something similar advertised for Watcom C recently. Having a freeware equivalent would be very cool. -- Alexander Lehmann, alex AT hal DOT rhein-main DOT de | "On the Internet, lehmann AT mathematik DOT th-darmstadt DOT de | nobody knows lehmann AT usa DOT net (permanent forward) | you're a dog."