I have compiled helloworld plugin but the DLL can not be loaded on start and throws an exception telling an entry function in codeblocks.dll regarding to loggin is not found. I am using nightly buid, is there a possiblity of a problem becouse of the SDK/example date?
If you are using a downloaded SDK, it will probably be the SDK for RC2. This is by far no longer compatible with any nightly build. In order for linkage to be possible between your plugin and codeblocks.dll, they need to originate from the same source code and be compiled with the same settings. I would therefore advise you to consider getting the latest SVN revision (you can find instructions for this at the home page) and compile Code::Blocks, as this will make sure any plugin you build from whithin your environment is compatible with your Code::Blocks binary.
It would take more effort, but I can tell you that it pays. Not only are linkage problems eliminated, but being able to browse the source code of the application you're writing a plugin for is a HUGE help.
Good Luck