WerRegisterCustomMetadata function (werapi.h)

Registers app-specific metadata to be collected (in the form of key/value strings) for the Windows Error Reporting (WER) error report.


HRESULT WerRegisterCustomMetadata(
  PCWSTR key,
  PCWSTR value



The "key" string for the metadata element being registered.


The value string for the metadata element being registered.

Return value

This function returns S_OK on success or an error code on failure, including the following error codes.

Return code Description
E_INVALIDARG Strings were NULL, key length was greater than 64 characters or was an invalid xml element name, or value length was greater than 128 characters or contained characters that were not ASCII printable characters.
E_OUTOFMEMORY WER could not allocate a large enough heap for the data
HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER) The maximum number of registered entries (WER_MAX_REGISTERED_ENTRIES) or maximum amount of registered metadata (WER_MAX_REGISTERED_METADATA) has been reached.
WER_E_INVALID_STATE The process state is not valid. For example, the process is in application recovery mode.


This API allows apps to integrate their own app-level telemetry with system-level telemetry (WER) by associating app metadata with crash reports corresponding to their processes.


Requirement Value
Minimum supported client Windows 10, version 1703 [desktop apps | UWP apps]
Minimum supported server Windows Server 2016 [desktop apps | UWP apps]
Target Platform Windows
Header werapi.h
Library Kernel32.lib
DLL Kernel32.dll

See also

WerUnregisterCustomMetadata, Windows Error Reporting