Possible Duplicate:
Objective C for Windows
iPhone development on Windows
How do i setup and write Objective-C on my Windows Vista (32 bit) machine?
Can someone please give me instructions?
Possible Duplicate:
Objective C for Windows
iPhone development on Windows
How do i setup and write Objective-C on my Windows Vista (32 bit) machine?
Can someone please give me instructions?
You can use GNUStep http://www.gnustep.org/. You can also use Eclipse CDT with GNUStep, see configuration here http://wirecode.blogspot.com/2007/11/objective-c-and-eclipse.html
You might be able to compile Objective C code on a Windows machine using the GNUStep toolchain. But this will not allow you to write iPhone apps, as the Objective C runtimes are very different, so you won't be able to link with any of Apple's iOS frameworks, or use much of their example code.