I wated to make a DLL that would recieve a string through GM, and print that string through an external device (printer). What I need is my DLL to recognise the default printer on the computer and send the string to be printed when it has been found, or unreact when it hasen't. Any ideas how I can do this in Dev-C++?

First of all, do you have some experience creating DLLs? If not, I suggest you start with something much simpler (like one to display a message) than one to print text. If you don't even know how to display a message, then you probably wouldn't be able to print text. ^_^