I write a program on GoLang with inclusion Objective-C code (call some OSX API) via
C GoLang's package and I need to pass variable of type
T from Go code to Objective-C code and vice versa.
T is structure (or other type). So I need to create compatible (in terms of memory layout) type/variable in GoLang and pass it to Objective-C via
unsafe.Pointer casting. For generic C code I use
godefs in such cases, but I unable to use
godefs for Objective-C. If I try
go tool cgo -godefs cgodefs.go
// This is "cgodefs.go" file package tmp /* #cgo CFLAGS: -x objective-c #cgo LDFLAGS: -framework Cocoa #import <Cocoa/Cocoa.h> */ import "C" type CGPoint C.CGPoint
I receive tons of errors:
In file included from /Users/unsacrificed/go/src/gui/cgodefs.go:10: In file included from /System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:12: In file included from /System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:8: /System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:503:1: error: expected identifier or '(' @class NSString, Protocol; ^ /System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:505:9: error: unknown type name 'NSString' typedef NSString * NSExceptionName NS_EXTENSIBLE_STRING_ENUM; ^ /System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:506:9: error: unknown type name 'NSString' typedef NSString * NSRunLoopMode NS_EXTENSIBLE_STRING_ENUM; ... (100000+ lines of errors)
Interested thing is that I can compile and run GoLang apps with Objective-C via
C GoLang's package.
I report to GoLang but he says that
The cgo tool works with C, not Objective-C.
Is there any way to get GoLang equivalent (memory compatible) type for Objective-C type?