DLL Injection with slots... ?!?!?

[squidge]

Are you sure you are using the exact same DLLs and library instance for Qt as the main application?

I don't think the main app needs to know about your slots, as they defined by MOC, and as long as you are using the same version of MOC (and Qt) as the main app, it should find your slot at run time.

If the app you are hooking into using a statically linked version of Qt, then it's a lot more difficult.

[tbscope]

As squidge already said, signals and slots are handled by MOC.
Thus, make sure that your injected DLL is processed by MOC before linking it (here I mean the actual linking of the DLL, not injecting it).