I have a Xamarin.iOs project runs successfully. Recently I upgraded one of the Nugetpackages used in the project and I am ended up with various Native linking failedissues. followings are part of the errors.
What is the reason for these issues and how can I overcome these? Please help me. Thank you!
This happens when you upgrade your Nugetpackages and the native linker can't find a symbol referenced somewhere. For specific solutions, you can refer to the official documentation: MT5210: Native linking failed, undefined symbol: *. Please verify that all the necessary frameworks have been referenced and native libraries are properly linked in.
Related
Building a WinCE 5.0 application to use a semaphore. The function I am using to create the semaphore is CreateSemaphore(). The problem is that the application cannot be linked because there is not reference to the symbol CreateSemaphore. The Windows documentation (https://msdn.microsoft.com/en-us/windows/desktop/ms885184) suggests that as long as I have nk.lib, the application should build. The problem is this library is no where to be found. I am also using the standard sdk for WinCE 5.0.
I have searched for the nk.lib library, but have not been able to find it.
Any thoughts on where this library is or if there is an alternative? I know this stuff is really old, but I am hoping someone knows where I can find this library.
EDIT: I figured I should add the link error:
error LNK2019: unresolved external symbol __imp__CreateSemaphoreA referenced in function _Syn_System_Semaphore_initialize
In CE 5.0, CreateSemaphore is exported by coredll, so you'll need to link with coredll.lib.
I have just updated to Android Studio 3.1.1, and now all my support library related imports are shown as broken (see screenshot attached), even though the app successfully builds and can be installed on a device. Is there a way to fix this? Thanks.
I had the same problem also
and resolved it by using support version 27.1.1.
Indeed, using support library version 27.1.1 fixed the problem.
Thanks, whoever commented and then deleted their comment - good thing I noticed it :)
I'm using Xamarin Studio to build iOS app.
But I am getting this weird builds with follow error.
Error MT5211: Native linking failed, undefined Objective-C class: PayPalTouch. The symbol '_OBJC_CLASS_$_PayPalTouch' could not be found in any of the libraries or frameworks linked with your application. (MT5211)
Error MT5202: Native linking failed. Please review the build log. (MT5202)
Trying many ways following the stack overflow discussions. But still no good!
Any idea how can i fix it?
Thank you
I fixed similar issues by adding a [Protocol] tag before every classes in error.
https://developer.xamarin.com/guides/ios/advanced_topics/registrar/
I have no experience with using Xamarin Studio, can't find the detial, but there is a question I asked about How to link an Objective-C static library to Xamarin.iOS, you can take a look.
How to bind an Objective-C static library to Xamarin.iOS?
Hope it can help you.
I am trying to work an F# tutorial on Pluralsight (see screencaps) where you have to install Xunit and write the tests but it's not working for me. It works fine for someone using Visual Studio as shown in the screencaps below, but I am not using Visual Studio. I'm on a Linux system using Monodevelop and I get this message: Composition error: the type 'Object' is required here and is unavailable. You must add a reference to assembly 'System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
I think it must be the Assembly.fs file where I'm supposed to add the reference but I am not sure, nor do I know exactly how to add this reference correctly. Furthermore, I am unsure if the problem may be due to Monodevelop not recognizing a valid Linux path and if so, how to fix that. Any help would be greatly appreciated because I'm completely stuck.
Here is the error I'm getting in Monodevelop:
As already mentioned in the comments, there is not enough information in your answer to give you a proper question. The error generally happens when you add reference to a dll that is itself referencing another dll and you do not have a reference to the other dll. So in general, you can fix this by adding the reference (as mentioned in the error message).
The specific assembly that you're getting an issue on is a core library referenced by portable .NET libraries. Try adding a reference as discussed for example here.
Otherwise, you need to give us more information - what type of project are you creating (what .NET version and profile) and what other libraries are you referencing in your project.
I m working on android application in which I used JNI for native c code.
I build this application on android 2.0 version and ndkr3 and it works fine.
Now when I changed the android sdk version 1.5 and api version 3 I faced problems of unable to open library libtest_demo.so.
05-13 16:54:23.603: INFO/dalvikvm(1211): Unable to dlopen(/data/data/org.abc.test_demo/lib/libtest_demo.so): Cannot find library
I put the libtest_demo.so file at the same place /data/data/org.abc.test_demo/lib/libtest_demo.so but still the same problem arises.
In my java file I called native libraries like,
System.loadLibrary("abc_jni");
System.loadLibrary("test_demo");
And from the logcat I seen both libraries used same memory address.
This is logcat output
05-13 17:56:15.732: DEBUG/dalvikvm(9897): Trying to load lib /data/data/org.abc.test_demo/lib/libabc_jni.so 0x437317f8
05-13 17:56:15.732: DEBUG/dalvikvm(9897): Added shared lib /data/data/org.abc.test_demo/lib/libabc_jni.so 0x437317f8
05-13 17:56:15.742: DEBUG/dalvikvm(9897): Trying to load lib /data/data/org.abc.test_demo/lib/libtest_demo.so 0x437317f8
05-13 17:56:15.752: INFO/dalvikvm(9897): Unable to dlopen(/data/data/org.abc.test_demo/lib/libtest_demo.so): Cannot find library
This error almost always says "Cannot find library" and there can be many reasons for this. What is annoying is that in most cases it is not the missing library but something else. Reasons I have stumbled upon:
library is missing from the directory (obviously),
library that is dynamically linked with your library is missing,
system library versions on the device/emulator that your library uses differ with those that you were linking against in compile time (missing symbols, etc.)
I have described a method that worked for me when resolving an issue with library that was working fine on emulator and was failing to load on Nexus One, maybe this will help you: http://mpigulski.blogspot.com/2010/09/debugging-dlopen-unsatisfiedlinkerror.html