I have a lib with some TDataModules who share a TADOConnection. I create and delete datamodules in some applications.
When I delete a datamodule, I get an EAccessViolation error. I think this is due to the fact that the datamodule wants to delete the TADOConnection, which is shared.
I tried setting the tdatamodule->tbquery->Connection property to NULL when the destructor is called, without any luck.
Why do I think the error resides in TADOConnection? Because when I build my application without a lib, I can create and delete datamodules without any problems. And when I create a lib with datamodules who have their own connection, I have no problems either.
Any help? Thanks in advance!
The error: http://oi60.tinypic.com/noyc6x.jpg
The call stack: http://oi61.tinypic.com/sgljx5.jpg
The solution is adding borlndmm.dll to the project folder of the application using the libraries or dll's.
From the dll/lib projects in Borland C++ Builder:
//---------------------------------------------------------------------------
// Important note about DLL memory management when your DLL uses the
// static version of the RunTime Library:
//
// If your DLL exports any functions that pass String objects (or structs/
// classes containing nested Strings) as parameter or function results,
// you will need to add the library MEMMGR.LIB to both the DLL project and
// any other projects that use the DLL. You will also need to use MEMMGR.LIB
// if any other projects which use the DLL will be performing new or delete
// operations on any non-TObject-derived classes which are exported from the
// DLL. Adding MEMMGR.LIB to your project will change the DLL and its calling
// EXE's to use the BORLNDMM.DLL as their memory manager. In these cases,
// the file BORLNDMM.DLL should be deployed along with your DLL.
//
// To avoid using BORLNDMM.DLL, pass string information using "char *" or
// ShortString parameters.
//
// If your DLL uses the dynamic version of the RTL, you do not need to
// explicitly add MEMMGR.LIB as this will be done implicitly for you
//---------------------------------------------------------------------------