I built a dlm-dll combination. I actually built two such combinations. The one that had the interesting stuff I wanted to do and testmodule which is the sample found in the documentation that uses testfun and testpro. Everything worked.

Two months later I bring it out of version control to insert it into a new branch. Since then I have altered some of the support code (new cuda version)that the dll uses. I recompile and place the dlm-dll where they should go and....it doesn't work. Error loading the dll. The specified procedure could not be found. That seems odd. Working backwards I cannot get what did work two months ago to work at all. I go back to testmodule stripped directly from old version control and...that won't work either. What have I done?

IDL> DLM_LOAD, 'the correct directory\testmodule.dlm'
% Dynamically loadable module TESTMODULE redefines existing routine TESTFUN on line 9 of module definition file: "the correct directory"\testmodule.dlm.
% Dynamically loadable module TESTMODULE redefines existing routine TESTPRO on line 10 of module definition file: "the correct directory"\testmodule.dlm.
% DLM_LOAD: Error loading sharable executable.
Symbol: IDL_Load, File = "the correct directory"\testmodule.dll

doing a dir on "the correct directory" shows both testmodule.dlm (which it clearly seems to read) and testmodule.dll which it doesn't seem to be able to find.

the dlm reads....
MODULE testmodule
DESCRIPTION Test code for loadable modules
VERSION 1.0

SOURCE Exelis VIS

BUILD_DATE JAN 8 1998

FUNCTION TESTFUN 0 IDL_MAXPARAMS
PROCEDURE TESTPRO 0 IDL_MAX_ARRAY_DIM

and the dll is similarly pulled from the documentation.

It worked two months ago. I'm puzzled. What did work, now doesn't work, even though the references seem to point to the correct place. I'm overlooking something, but what?