Compiling DLL for external tutorial
I am trying to complete the external tutorial for MetaCard on Windows. I have built the DLL using the external code provided with MetaCard, and it seems to compile fine. When I open the external tutorial stack, the external.dll gets attached (Windows no longer lets me delete the file or change its name because it is in use). But, MetaCard isn't recognizing any of the XCMDs. For example, clicking on the "sprintf" button yields the error message "can't find handler". Clicking on the "xatan2" button yields the error message "error in function handler", presumably for the same reason. I suspect the list of XCMDs/XFCNs in the DLL is somehow not being registered properly. I am building the DLL in CodeWarrior (ver. 3.2), compiling the source files XCmdGlue.c and external.c. I notice in the "external.def" file that comes with MetaCard that there is something saying EXPORTS getXtable and I have not taken this into account (I'm not sure how I would in CodeWarrior; the .def file is for Visual C++). I have not touched CodeWarrior's default (for a DLL project) settings for memory usage (base address, stack and heap sizes -- anyway I'm not sure whether they are relevant for DLLs). Nor have I changed any link options (thus I have not checked boxes to generate link map, SYM file, or CV info, whatever those do). There must be some obvious solution to this, but I'm afraid I'm new at this Can anyone provide insights? Or maybe someone can email me directly with a CodeWarrior project version of the external, for an example that works as a starting point? Thanks much in advance! Ken Archives: http://www.mail-archive.com/metacard%40lists.best.com/ Info: http://www.xworlds.com/metacard/mailinglist.htm Please send bug reports to [EMAIL PROTECTED], not this list.
How to create large XCMD / DLL with callbacks
I need to create an XCMD and DLL with several tricky characteristics. While I have created Macintosh XCMDs before, I am not sure how to deal with this set of characteristics. Also I have not dealt with DLLs for PCs so I am unaware of issues that may arise. Any insights or references to code that does the job would be much appreciated. 1. The XCMD / DLL must be substantially larger than 32K. So, at least for Macintosh, I have to create an XCMD that loads the larger block of code into memory and then calls it. Also, perhaps it is best to leave the loaded code resident in memory until MetaCard quits (or my MetaCard stack closes), because the XCMD / DLL will be called repeatedly. 2. The XCMD / DLL must allocate large amounts of memory (several MB), to be maintained even when the XCMD / DLL is not in use, and de-allocated when MetaCard quits. I have done this previously on the Mac, but I haven't learned how to do this on PCs. 3. The XCMD / DLL must set global variables in MetaCard, and ideally could make other callbacks to MetaCard. CodeWarrior comes with some sample projects that discuss issues 1 and 3, but they take some work to understand (indeed no sample project incorporates both characteristics 1 and 3) and to be honest I haven't understood yet. I was thinking of programming in CodeWarrior C (I have version 3.2), though I could switch to different software and/or programming language if that would help. If anyone has a template or sample code, ideally with at least characteristics 1 and 3, you could be my savior. Thanks in advance, Ken This is the MetaCard mailing list. Archives: http://www.mail-archive.com/metacard%40lists.best.com/ Info: http://www.xworlds.com/metacard/mailinglist.htm
