pdh.h header
This header is used by Performance Counters. For more information, see:
pdh.h contains the following programming interfaces:
Functions
| PdhAddCounterA Adds the specified counter to the query. (ANSI) |
| PdhAddCounterW Adds the specified counter to the query. (Unicode) |
| PdhAddEnglishCounterA Adds the specified language-neutral counter to the query. (ANSI) |
| PdhAddEnglishCounterW Adds the specified language-neutral counter to the query. (Unicode) |
| PdhBindInputDataSourceA Binds one or more binary log files together for reading log data. (ANSI) |
| PdhBindInputDataSourceW Binds one or more binary log files together for reading log data. (Unicode) |
| PdhBrowseCountersA Displays a Browse Counters dialog box that the user can use to select one or more counters that they want to add to the query. To use handles to data sources, use the PdhBrowseCountersH function. (ANSI) |
| PdhBrowseCountersHA Displays a Browse Counters dialog box that the user can use to select one or more counters that they want to add to the query. This function is identical to the PdhBrowseCounters function, except that it supports the use of handles to data sources. (ANSI) |
| PdhBrowseCountersHW Displays a Browse Counters dialog box that the user can use to select one or more counters that they want to add to the query. This function is identical to the PdhBrowseCounters function, except that it supports the use of handles to data sources. (Unicode) |
| PdhBrowseCountersW Displays a Browse Counters dialog box that the user can use to select one or more counters that they want to add to the query. To use handles to data sources, use the PdhBrowseCountersH function. (Unicode) |
| PdhCalculateCounterFromRawValue Calculates the displayable value of two raw counter values. |
| PdhCloseLog Closes the specified log file. |
| PdhCloseQuery Closes all counters contained in the specified query, closes all handles related to the query, and frees all memory associated with the query. |
| PdhCollectQueryData Collects the current raw data value for all counters in the specified query and updates the status code of each counter. (PdhCollectQueryData) |
| PdhCollectQueryDataEx Uses a separate thread to collect the current raw data value for all counters in the specified query. The function then signals the application-defined event and waits the specified time interval before returning. |
| PdhCollectQueryDataWithTime Collects the current raw data value for all counters in the specified query and updates the status code of each counter. (PdhCollectQueryDataWithTime) |
| PdhComputeCounterStatistics Computes statistics for a counter from an array of raw values. |
| PdhConnectMachineA Connects to the specified computer. (ANSI) |
| PdhConnectMachineW Connects to the specified computer. (Unicode) |
| PdhEnumLogSetNamesA Enumerates the names of the log sets within the DSN. (ANSI) |
| PdhEnumLogSetNamesW Enumerates the names of the log sets within the DSN. (Unicode) |
| PdhEnumMachinesA Returns a list of the computer names associated with counters in a log file. (PdhEnumMachinesA) |
| PdhEnumMachinesHA Returns a list of the computer names associated with counters in a log file. (PdhEnumMachinesHA) |
| PdhEnumMachinesHW Returns a list of the computer names associated with counters in a log file. (PdhEnumMachinesHW) |
| PdhEnumMachinesW Returns a list of the computer names associated with counters in a log file. (PdhEnumMachinesW) |
| PdhEnumObjectItemsA Returns the specified object's counter and instance names that exist on the specified computer or in the specified log file. To use handles to data sources, use the PdhEnumObjectItemsH function. (ANSI) |
| PdhEnumObjectItemsHA Returns the specified object's counter and instance names that exist on the specified computer or in the specified log file. This function is identical to the PdhEnumObjectItems function, except that it supports the use of handles to data sources. (ANSI) |
| PdhEnumObjectItemsHW Returns the specified object's counter and instance names that exist on the specified computer or in the specified log file. This function is identical to the PdhEnumObjectItems function, except that it supports the use of handles to data sources. (Unicode) |
| PdhEnumObjectItemsW Returns the specified object's counter and instance names that exist on the specified computer or in the specified log file. To use handles to data sources, use the PdhEnumObjectItemsH function. (Unicode) |
| PdhEnumObjectsA Returns a list of objects available on the specified computer or in the specified log file. To use handles to data sources, use the PdhEnumObjectsH function. (ANSI) |
| PdhEnumObjectsHA Returns a list of objects available on the specified computer or in the specified log file.This function is identical to PdhEnumObjects, except that it supports the use of handles to data sources. (ANSI) |
| PdhEnumObjectsHW Returns a list of objects available on the specified computer or in the specified log file.This function is identical to PdhEnumObjects, except that it supports the use of handles to data sources. (Unicode) |
| PdhEnumObjectsW Returns a list of objects available on the specified computer or in the specified log file. To use handles to data sources, use the PdhEnumObjectsH function. (Unicode) |
| PdhExpandCounterPathA Examines the specified computer (or local computer if none is specified) for counters and instances of counters that match the wildcard strings in the counter path. (ANSI) |
| PdhExpandCounterPathW Examines the specified computer (or local computer if none is specified) for counters and instances of counters that match the wildcard strings in the counter path. (Unicode) |
| PdhExpandWildCardPathA Examines the specified computer or log file and returns those counter paths that match the given counter path which contains wildcard characters. To use handles to data sources, use the PdhExpandWildCardPathH function. (ANSI) |
| PdhExpandWildCardPathHA Examines the specified computer or log file and returns those counter paths that match the given counter path which contains wildcard characters.This function is identical to the PdhExpandWildCardPath function, except that it supports the use of handles to data sources. (ANSI) |
| PdhExpandWildCardPathHW Examines the specified computer or log file and returns those counter paths that match the given counter path which contains wildcard characters.This function is identical to the PdhExpandWildCardPath function, except that it supports the use of handles to data sources. (Unicode) |
| PdhExpandWildCardPathW Examines the specified computer or log file and returns those counter paths that match the given counter path which contains wildcard characters. To use handles to data sources, use the PdhExpandWildCardPathH function. (Unicode) |
| PdhFormatFromRawValue Computes a displayable value for the given raw counter values. |
| PdhGetCounterInfoA Retrieves information about a counter, such as data size, counter type, path, and user-supplied data values. (ANSI) |
| PdhGetCounterInfoW Retrieves information about a counter, such as data size, counter type, path, and user-supplied data values. (Unicode) |
| PdhGetCounterTimeBase Returns the time base of the specified counter. |
| PdhGetDataSourceTimeRangeA Determines the time range, number of entries and, if applicable, the size of the buffer containing the performance data from the specified input source. To use handles to data sources, use the PdhGetDataSourceTimeRangeH function. (ANSI) |
| PdhGetDataSourceTimeRangeH Determines the time range, number of entries and, if applicable, the size of the buffer containing the performance data from the specified input source.This function is identical to the PdhGetDataSourceTimeRange function, except that it supports the use of handles to data sources. |
| PdhGetDataSourceTimeRangeW Determines the time range, number of entries and, if applicable, the size of the buffer containing the performance data from the specified input source. To use handles to data sources, use the PdhGetDataSourceTimeRangeH function. (Unicode) |
| PdhGetDefaultPerfCounterA Retrieves the name of the default counter for the specified object. This name can be used to set the initial counter selection in the Browse Counter dialog box. To use handles to data sources, use the PdhGetDefaultPerfCounterH function. (ANSI) |
| PdhGetDefaultPerfCounterHA Retrieves the name of the default counter for the specified object. (ANSI) |
| PdhGetDefaultPerfCounterHW Retrieves the name of the default counter for the specified object. (Unicode) |
| PdhGetDefaultPerfCounterW Retrieves the name of the default counter for the specified object. This name can be used to set the initial counter selection in the Browse Counter dialog box. To use handles to data sources, use the PdhGetDefaultPerfCounterH function. (Unicode) |
| PdhGetDefaultPerfObjectA Retrieves the name of the default object. This name can be used to set the initial object selection in the Browse Counter dialog box. To use handles to data sources, use the PdhGetDefaultPerfObjectH function. (ANSI) |
| PdhGetDefaultPerfObjectHA Retrieves the name of the default object. (ANSI) |
| PdhGetDefaultPerfObjectHW Retrieves the name of the default object. (Unicode) |
| PdhGetDefaultPerfObjectW Retrieves the name of the default object. This name can be used to set the initial object selection in the Browse Counter dialog box. To use handles to data sources, use the PdhGetDefaultPerfObjectH function. (Unicode) |
| PdhGetDllVersion Returns the version of the currently installed Pdh.dll file. |
| PdhGetFormattedCounterArrayA Returns an array of formatted counter values. Use this function when you want to format the counter values of a counter that contains a wildcard character for the instance name. (ANSI) |
| PdhGetFormattedCounterArrayW Returns an array of formatted counter values. Use this function when you want to format the counter values of a counter that contains a wildcard character for the instance name. (Unicode) |
| PdhGetFormattedCounterValue Computes a displayable value for the specified counter. |
| PdhGetLogFileSize Returns the size of the specified log file. |
| PdhGetRawCounterArrayA Returns an array of raw values from the specified counter. Use this function when you want to retrieve the raw counter values of a counter that contains a wildcard character for the instance name. (ANSI) |
| PdhGetRawCounterArrayW Returns an array of raw values from the specified counter. Use this function when you want to retrieve the raw counter values of a counter that contains a wildcard character for the instance name. (Unicode) |
| PdhGetRawCounterValue Returns the current raw value of the counter. |
| PdhIsRealTimeQuery Determines if the specified query is a real-time query. |
| PdhLookupPerfIndexByNameA Returns the counter index corresponding to the specified counter name. (ANSI) |
| PdhLookupPerfIndexByNameW Returns the counter index corresponding to the specified counter name. (Unicode) |
| PdhLookupPerfNameByIndexA Returns the performance object name or counter name corresponding to the specified index. (ANSI) |
| PdhLookupPerfNameByIndexW Returns the performance object name or counter name corresponding to the specified index. (Unicode) |
| PdhMakeCounterPathA Creates a full counter path using the members specified in the PDH_COUNTER_PATH_ELEMENTS structure. (ANSI) |
| PdhMakeCounterPathW Creates a full counter path using the members specified in the PDH_COUNTER_PATH_ELEMENTS structure. (Unicode) |
| PdhOpenLogA Opens the specified log file for reading or writing. (ANSI) |
| PdhOpenLogW Opens the specified log file for reading or writing. (Unicode) |
| PdhOpenQueryA Creates a new query that is used to manage the collection of performance data. To use handles to data sources, use the PdhOpenQueryH function. (ANSI) |
| PdhOpenQueryH Creates a new query that is used to manage the collection of performance data. This function is identical to the PdhOpenQuery function, except that it supports the use of handles to data sources. |
| PdhOpenQueryW Creates a new query that is used to manage the collection of performance data. To use handles to data sources, use the PdhOpenQueryH function. (Unicode) |
| PdhParseCounterPathA Parses the elements of the counter path and stores the results in the PDH_COUNTER_PATH_ELEMENTS structure. (ANSI) |
| PdhParseCounterPathW Parses the elements of the counter path and stores the results in the PDH_COUNTER_PATH_ELEMENTS structure. (Unicode) |
| PdhParseInstanceNameA Parses the elements of an instance string. (ANSI) |
| PdhParseInstanceNameW Parses the elements of an instance string. (Unicode) |
| PdhReadRawLogRecord Reads the information in the specified binary trace log file. |
| PdhRemoveCounter Removes a counter from a query. |
| PdhSelectDataSourceA Displays a dialog window that prompts the user to specify the source of the performance data. (ANSI) |
| PdhSelectDataSourceW Displays a dialog window that prompts the user to specify the source of the performance data. (Unicode) |
| PdhSetCounterScaleFactor Sets the scale factor that is applied to the calculated value of the specified counter when you request the formatted counter value. If the PDH_FMT_NOSCALE flag is set, then this scale factor is ignored. |
| PdhSetDefaultRealTimeDataSource Specifies the source of the real-time data. |
| PdhSetQueryTimeRange Limits the samples that you can read from a log file to those within the specified time range, inclusively. |
| PdhUpdateLogA Collects counter data for the current query and writes the data to the log file. (ANSI) |
| PdhUpdateLogFileCatalog Synchronizes the information in the log file catalog with the performance data in the log file. |
| PdhUpdateLogW Collects counter data for the current query and writes the data to the log file. (Unicode) |
| PdhValidatePathA Validates that the counter is present on the computer specified in the counter path. (ANSI) |
| PdhValidatePathExA Validates that the specified counter is present on the computer or in the log file. (ANSI) |
| PdhValidatePathExW Validates that the specified counter is present on the computer or in the log file. (Unicode) |
| PdhValidatePathW Validates that the counter is present on the computer specified in the counter path. (Unicode) |
Callback functions
| CounterPathCallBack Applications implement the CounterPathCallBack function to process the counter path strings returned by the Browse dialog box. |
Structures
| PDH_BROWSE_DLG_CONFIG_A The PDH_BROWSE_DLG_CONFIG structure is used by the PdhBrowseCounters function to configure the Browse Performance Counters dialog box. (ANSI) |
| PDH_BROWSE_DLG_CONFIG_HA The PDH_BROWSE_DLG_CONFIG_H structure is used by the PdhBrowseCountersH function to configure the Browse Performance Counters dialog box. (ANSI) |
| PDH_BROWSE_DLG_CONFIG_HW The PDH_BROWSE_DLG_CONFIG_H structure is used by the PdhBrowseCountersH function to configure the Browse Performance Counters dialog box. (Unicode) |
| PDH_BROWSE_DLG_CONFIG_W The PDH_BROWSE_DLG_CONFIG structure is used by the PdhBrowseCounters function to configure the Browse Performance Counters dialog box. (Unicode) |
| PDH_COUNTER_INFO_A The PDH_COUNTER_INFO structure contains information describing the properties of a counter. This information also includes the counter path. (ANSI) |
| PDH_COUNTER_INFO_W The PDH_COUNTER_INFO structure contains information describing the properties of a counter. This information also includes the counter path. (Unicode) |
| PDH_COUNTER_PATH_ELEMENTS_A The PDH_COUNTER_PATH_ELEMENTS structure contains the components of a counter path. (ANSI) |
| PDH_COUNTER_PATH_ELEMENTS_W The PDH_COUNTER_PATH_ELEMENTS structure contains the components of a counter path. (Unicode) |
| PDH_DATA_ITEM_PATH_ELEMENTS_A The PDH_DATA_ITEM_PATH_ELEMENTS structure contains the path elements of a specific data item. (ANSI) |
| PDH_DATA_ITEM_PATH_ELEMENTS_W The PDH_DATA_ITEM_PATH_ELEMENTS structure contains the path elements of a specific data item. (Unicode) |
| PDH_FMT_COUNTERVALUE The PDH_FMT_COUNTERVALUE structure contains the computed value of the counter and its status. |
| PDH_FMT_COUNTERVALUE_ITEM_A The PDH_FMT_COUNTERVALUE_ITEM structure contains the instance name and formatted value of a counter. (ANSI) |
| PDH_FMT_COUNTERVALUE_ITEM_W The PDH_FMT_COUNTERVALUE_ITEM structure contains the instance name and formatted value of a counter. (Unicode) |
| PDH_RAW_COUNTER The PDH_RAW_COUNTER structure returns the data as it was collected from the counter provider. No translation, formatting, or other interpretation is performed on the data. |
| PDH_RAW_COUNTER_ITEM_A The PDH_RAW_COUNTER_ITEM structure contains the instance name and raw value of a counter. (ANSI) |
| PDH_RAW_COUNTER_ITEM_W The PDH_RAW_COUNTER_ITEM structure contains the instance name and raw value of a counter. (Unicode) |
| PDH_RAW_LOG_RECORD The PDH_RAW_LOG_RECORD structure contains information about a binary trace log file record. |
| PDH_STATISTICS The PDH_STATISTICS structure contains the minimum, maximum, and mean values for an array of raw counters values. |
| PDH_TIME_INFO The PDH_TIME_INFO structure contains information on time intervals as applied to the sampling of performance data. |