Dynamic Link Libraries Inside-Out - Troubleshooting and Common Errors

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Runtime loading of the DLL is failing:

• The DLL is not in the path that can be located by system
• The entry point setting of the DLL has changed
• DLL entry point function is returning FALSE

Failed to get the procedure address from DLL:

• The exporting of the function may not be correct.
• Use .def file to export the functions.

System Crashing while accessing global data:

• If your system is multi threaded, ensure that the data is protected across the threads.

How to export a class?

• Exactly similar to that of function except the __declspec should come between the keyword class and the name of the class. Example:
  class __declspec(dllexport) CexportedClass
  The module that is using this call should see a declaration like class __declspec(dllimport) CexportedClass

Weird “User breakpoint called from code at 0x77f7629c”

• In project settings-->C/C++->Code Generation category choose “Multithreaded DLL” under “Use runtime library” heading.

The Sample Code

You can download the code in the examples above so that you can try hands on what you’ve just read. Download the code here.

The PowerPoint Presentation

The PowerPoint presentation with this article is a quick refresher on the topic of DLLs and I hope you’ll find that useful if you’re training others about using DLLs and similar topics. Download the PPT here.

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