![]() ![]() Natvis C /WinRT: Loaded C:\Users\.\AppData\Local\Temp\ Natvis C /WinRT: Downloading C:\Users\.\AppData\Local\DevelopmentFiles\ffcddd4f-cfc0-44cb-b736-0b2d026def77VS.Debug_圆4.\ Natvis C /WinRT: Looking for C:\Users\.\AppData\Local\DevelopmentFiles\ffcddd4f-cfc0-44cb-b736-0b2d026def77VS.Debug_圆4.\ winmd file, followed by a download from the remote target to the local cache folder, and then a load of that. The following excerpt shows several attempts to probe for a. If a property isn't being displayed correctly, then turn on verbose natvis diagnostics in Visual Studio ( Tools > Options > Debugging > Output Window > Natvis diagnostic messages), and then observe the Output window for natvis errors. To prevent faulting, the visualizer makes several VirtualQuery calls in WINRT_abi_val. This can cause the process to terminate when the C expression evaluator faults. HIn some contexts, such as unit tests, an unhandled exception filter is installed. That's useful when the visualizer tries to evaluate a local variable outside of its lifetime scope (for example, before construction). Normally, the visualizer can catch unhandled exceptions, and degrade gracefully, displaying "" in Visual Studio Watch windows. The debug visualizer uses the Visual Studio C Expression Evaluator to invoke the exported WINRT_abi_val function to obtain property values. winmd if it can't be found remotely (for example, if F5 deployment didn't put it there).įor an example of the caching behavior, see the Troubleshooting section below. winmd is always up to date, as well as providing a means for manually caching a. ![]() This strategy ensures that the locally cached. If necessary, the remote file is downloaded, updating the local cache. If it finds one, then it records the size and date of the file, and then searches the remote debugging target for the same. In that case, the visualizer falls back to a local cache folder ( %TEMP%) for a suitable. exe isn't local, so the search for custom metadata (mentioned in the previous section) fails. For example, if the type being visualized is, then the visualizer looks, in sequence, for: It uses an algorithm similar to that of RoGetMetaDataFile, probing for successive substrings of the fully-qualified typename. The debug visualizer looks for user-defined metadata (. However, it can also support user-defined types and remote debugging, provided that you properly locate. Given the above, the debug visualizer works best with Windows system types for which metadata can be found in the C:\Windows\System32\WinMetadata folder. It does this via its implementation of IInspectable::GetRuntimeClassName. A visualized type must report a runtime class or an interface defined in discoverable metadata.This is because the debug visualizer uses the Visual Studio C Expression Evaluator, which in turn requires symbolic definitions for displayed property types. Doing so exports a WINRT_abi_val function, which provides the entry point for the debug visualizer to evaluate property values in the target process. Compile your code with the symbol WINRT_NATVIS defined.Here's how to opt into it for a release build. Natvis is automatically on for a debug build because WINRT_NATVIS is defined when the _DEBUG symbol is defined. For more info about the C /WinRT Visual Studio Extension (VSIX), see Visual Studio support for C /WinRT, and the VSIX.
0 Comments
Leave a Reply. |