我正在尝试通过创建 Xamarin.iOS 绑定(bind)项目来使用 native Objective-C 框架。绑定(bind)项目本身编译得很好，但是，引用它的 iOS 应用程序项目，每当我添加一些使用此绑定(bind)库的代码行时都不会构建。错误是:
Error MT5202: Native linking failed. Please review the build log. (MT5202)
我在互联网上搜索过，包括在这里，看到很多人有类似的问题，但它与库编译的体系结构有关。所以可以肯定的是，我已经检查了命令工具中的库，结果是我应该让它在模拟器和真实设备中工作。命令和输出是:
# xcrun -sdk iphoneos lipo -info libDTEFMobile.a
Architectures in the fat file: libDTEFMobile.a are: armv7 armv7s i386
和
# file libDTEFMobile.a
libDTEFMobile.a: Mach-O universal binary with 3 architectures
libDTEFMobile.a (for architecture armv7): current ar archive random library
libDTEFMobile.a (for architecture cputype (12) cpusubtype (11)): current ar archive random library
libDTEFMobile.a (for architecture i386): current ar archive random library
为了确定，我已经检查了绑定(bind)项目中的 linkwith.cs 文件，这就是我所拥有的:
[assembly: LinkWith ("libDTEFMobile.a", LinkTarget.ArmV7 | LinkTarget.ArmV7s | LinkTarget.Simulator, ForceLoad = true)]
我的构建输出的最后日志是:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -Qunused-arguments -miphoneos-version-min=7.0 -c -o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/mscorlib.dll.armv7.o -x assembler /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/mscorlib.dll.armv7.s
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -Wl,-pie -miphoneos-version-min=7.0 -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/M2MobileiOS.exe.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/monotouch.dll.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/mscorlib.dll.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/M2.Mobile.Bindings.iOS.dll.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/registrar.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/main.armv7.o -force_load /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/libDTEFMobile.a -o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/bin/iPhone/Debug/M2MobileiOS.app/M2MobileiOS -framework CFNetwork -framework Foundation -framework UIKit -framework CoreGraphics -lz -liconv -u _mono_pmip -u _monotouch_release_managed_ref -u _monotouch_create_managed_ref -u _monotouch_log /Developer/MonoTouch/SDKs/MonoTouch.iphoneos.sdk/usr/lib/libmonoboehm-2.0.a /Developer/MonoTouch/SDKs/MonoTouch.iphoneos.sdk/usr/lib/libmonotouch-debug.a
Process exited with code 1, command:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -Wl,-pie -miphoneos-version-min=7.0 -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/M2MobileiOS.exe.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/monotouch.dll.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/mscorlib.dll.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/M2.Mobile.Bindings.iOS.dll.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/registrar.armv7.o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/main.armv7.o -force_load /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/obj/iPhone/Debug/mtouch-cache/libDTEFMobile.a -o /Users/gutemberg/Projects/M2.Mobile/M2.Mobile.iOS/bin/iPhone/Debug/M2MobileiOS.app/M2MobileiOS -framework CFNetwork -framework Foundation -framework UIKit -framework CoreGraphics -lz -liconv -u _mono_pmip -u _monotouch_release_managed_ref -u _monotouch_create_managed_ref -u _monotouch_log /Developer/MonoTouch/SDKs/MonoTouch.iphoneos.sdk/usr/lib/libmonoboehm-2.0.a /Developer/MonoTouch/SDKs/MonoTouch.iphoneos.sdk/usr/lib/libmonotouch-debug.a
Undefined symbols for architecture armv7:
"_EAAccessoryDidConnectNotification", referenced from:
-[PaxMessager connectByBT] in libDTEFMobile.a(DTEFMobile)
"_EAAccessoryDidDisconnectNotification", referenced from:
-[PaxMessager connectByBT] in libDTEFMobile.a(DTEFMobile)
"_OBJC_CLASS_$_EAAccessoryManager", referenced from:
objc-class-ref in libDTEFMobile.a(DTEFMobile)
"_OBJC_CLASS_$_EASession", referenced from:
objc-class-ref in libDTEFMobile.a(DTEFMobile)
(maybe you meant: _OBJC_CLASS_$_EASessionController)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error MT5202: Native linking failed. Please review the build log.
at MonoTouch.Application.NativeLink () [0x00000] in <filename unknown>:0
at MonoTouch.Application.BuildApp () [0x00000] in <filename unknown>:0
at MonoTouch.Application.Build () [0x00000] in <filename unknown>:0
at MTouch.Main2 (System.String[] args) [0x00000] in <filename unknown>:0
at MTouch.Main (System.String[] args) [0x00000] in <filename unknown>:0
---------------------- Done ----------------------
而且，我的 Xamarin.iOS 版本详细信息是:
Xamarin Studio
Version 4.0.12 (build 3)
Installation UUID: 7348d641-ed6d-4c8a-b59a-116674e06dfd
Runtime:
Mono 3.2.3 ((no/8d3b4b7)
GTK 2.24.20
GTK# (2.12.0.0)
Package version: 302030000
Apple Developer Tools
Xcode 5.0 (3332.25)
Build 5A1413
Xamarin.iOS
Version: 7.0.0.11 (Trial Edition)
Hash: aa35ba3
Branch:
Build date: 2013-18-09 16:42:48-0400
Build Information
Release ID: 400120003
Git revision: 593d7acb1cb78ceeeb482d5133cf1fe514467e39
Build date: 2013-08-07 20:30:53+0000
Xamarin addins: 25a0858b281923e666b09259ad4746b774e0a873
Operating System
Mac OS X 10.8.5
Darwin Gutembergs-MacBook-Pro.local 12.5.0 Darwin Kernel Version 12.5.0
Mon Jul 29 16:33:49 PDT 2013
root:xnu-2050.48.11~1/RELEASE_X86_64 x86_64
有人知道我是如何让它工作的吗？我尝试使用的库链接到 ExternalAccessory.framework，因此我可以访问蓝牙设备，这就是日志似乎提示的内容......
感谢您的帮助，非常感谢...
古腾堡
最佳答案
您必须链接到 ExternalAccessory 框架，Xamarin.iOS 无法自动确定是否需要为您的绑定(bind)完成此操作。
这很容易做到，只需将 Frameworks 属性添加到绑定(bind)项目中的 LinkWith 属性即可:
[LinkWith (..., Frameworks = "ExternalAccessory")]
关于ios - MT5202 : Native linking failed - Xamarin. iOS 7 - 外部附件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18926549/