TdhEnumerateProviderFieldInformation function (tdh.h)
Retrieves the specified field metadata for a given provider.
Syntax
TDHSTATUS TdhEnumerateProviderFieldInformation(
[in] LPGUID pGuid,
[in] EVENT_FIELD_TYPE EventFieldType,
[out, optional] PPROVIDER_FIELD_INFOARRAY pBuffer,
[in, out] ULONG *pBufferSize
);
Parameters
[in] pGuid
GUID that identifies the provider whose information you want to retrieve.
[in] EventFieldType
Specify the type of field for which you want to retrieve information. For possible values, see the EVENT_FIELD_TYPE enumeration.
[out, optional] pBuffer
User-allocated buffer to receive the field information. For details, see the PROVIDER_FIELD_INFOARRAY structure.
[in, out] pBufferSize
Size, in bytes, of the pBuffer buffer. If the function succeeds, this parameter receives the size of the buffer used. If the buffer is too small, the function returns ERROR_INSUFFICIENT_BUFFER and sets this parameter to the required buffer size. If the buffer size is zero on input, no data is returned in the buffer and this parameter receives the required buffer size.
Return value
Returns ERROR_SUCCESS if successful. Otherwise, this function returns one of the following return codes in addition to others.
Return code | Description |
---|---|
|
The size of the pBuffer buffer is too small. Use the required buffer size set in pBufferSize to allocate a new buffer. |
|
The requested field type is not valid. |
|
The manifest or MOF class was not found or does not contain information for the requested field type. |
|
One or more of the parameters is not valid. |
|
The resourceFileName attribute in the manifest contains the location of the provider binary. When you register the manifest, the location is written to the registry. TDH was unable to find the binary based on the registered location. |
Remarks
This function uses the XML manifest or WMI MOF class to retrieve the information.
Examples
The following example shows how to enumerate information contained in the manifest or MOF class for the requested field.
#include <windows.h>
#include <stdio.h>
#include <wmistr.h>
#include <evntrace.h>
#include <tdh.h>
#pragma comment(lib, "tdh.lib")
DWORD EnumFieldInfo(LPGUID pProvider, EVENT_FIELD_TYPE fieldType);
// GUID of the provider whose metadata you want to enumerate.
EXTERN_C __declspec(selectany) const GUID ProviderGuid = {0xd8909c24, 0x5be9, 0x4502, {0x98, 0xca, 0xab, 0x7b, 0xdc, 0x24, 0x89, 0x9d}};
void wmain(void)
{
DWORD status = ERROR_SUCCESS;
// Retrieve the keyword information.
wprintf(L"Retrieve EventKeywordInformation\n");
status = EnumFieldInfo((LPGUID)&ProviderGuid, EventKeywordInformation);
if (ERROR_SUCCESS != status)
{
wprintf(L"Failed to retrieve EventKeywordInformation (%lu).\n\n", status);
}
}
// Prints the information associated with the specified field type.
DWORD EnumFieldInfo(LPGUID pProvider, EVENT_FIELD_TYPE fieldType)
{
DWORD status = ERROR_SUCCESS;
PROVIDER_FIELD_INFOARRAY* penum = NULL;
DWORD bufferSize = 0;
// Retrieve the required buffer size. If the status is ERROR_INSUFFICIENT_BUFFER,
// use bufferSize to allocate the buffer.
status = TdhEnumerateProviderFieldInformation(pProvider, fieldType, penum, &bufferSize);
if (ERROR_INSUFFICIENT_BUFFER == status)
{
penum = (PROVIDER_FIELD_INFOARRAY*) malloc(bufferSize);
if (penum == NULL)
{
wprintf(L"Allocation failed (size=%lu).\n", bufferSize);
status = ERROR_OUTOFMEMORY;
goto cleanup;
}
// Retrieve the information for the field type.
status = TdhEnumerateProviderFieldInformation(pProvider, fieldType, penum, &bufferSize);
}
// The first call can fail with ERROR_NOT_FOUND if none of the provider's event
// descriptions contain the requested field type information.
if (ERROR_SUCCESS == status)
{
// Loop through the list of field information and print the field's name,
// description (if it exists), and value.
for (DWORD i = 0; i < penum->NumberOfElements; i++)
{
wprintf(L"Field name: %s\nDescription: %s\nValue: %I64u\n\n",
(PWCHAR)((PBYTE)(penum) + penum->FieldInfoArray[i].NameOffset),
(penum->FieldInfoArray[i].DescriptionOffset) ?
(PWCHAR)((PBYTE)(penum) + penum->FieldInfoArray[i].DescriptionOffset): L"",
penum->FieldInfoArray[i].Value);
}
}
else
{
if (ERROR_NOT_FOUND == status)
{
wprintf(L"Requested field type not found.\n");
}
else
{
wprintf(L"TdhEnumerateProviderFieldInformation failed with %lu.\n", status);
}
goto cleanup;
}
cleanup:
if (penum)
{
free(penum);
penum = NULL;
}
return status;
}
Requirements
Requirement | Value |
---|---|
Minimum supported client | Windows Vista [desktop apps only] |
Minimum supported server | Windows Server 2008 [desktop apps only] |
Target Platform | Windows |
Header | tdh.h |
Library | Tdh.lib |
DLL | Tdh.dll |