| 术语 | pdhenumobjectitems |
| 释义 | PdhEnumObjectItems 语法： C++ PDH_STATUS PdhEnumObjectItems( __in LPCTSTR szDataSource, __in LPCTSTR szMachineName, __in LPCTSTR szObjectName, __out LPTSTR mszCounterList, __inout LPDWORD pcchCounterListLength, __out LPTSTR mszInstanceList, __inout LPDWORD pcchInstanceListLength, __in DWORD dwDetailLevel, DWORD dwFlags ); PdhEnumObjectItems功能 返回指定对象的计数器和实例的名称在指定的计算机或指定的日志文件存在。 要使用句柄数据源，使用PdhEnumObjectItemsH功能。 参数 szDataSource [in] NULL结尾的字符串，指定日志文件的名称用于枚举计数器和实例名称。如果为NULL，该函数使用在szMachineName参数指定枚举计算机的名称。 szMachineName [in] NULL结尾的字符串，指定的计算机包含计数器和实例名称要枚举的名称。包括例如在计算机名领导斜线，，\\ \\计算机名。 如果szDataSource参数为NULL，您可以设置为NULL szMachineName指定本地计算机上。 szObjectName [in] null结尾的字符串，指定对象的名称，其计数器和实例名称要枚举。 mszCounterList [out] 来电分配的缓冲区，它接收的空列表，终止指定的对象提供的计数器名称。该列表包含独特的计数器名称。这份名单是由两个终止NULL字符。设置为NULL，如果pcchCounterListLengthparameter为零。 pcchCounterListLength [ in , out ] 的大小mszCounterList缓冲区，在TCHARs。如果零输入，该函数返回PDH_MORE_DATA，并设置此参数所需的缓冲区大小。如果缓冲区比所需的大小，功能设置此参数的时候，往往有人使用的缓冲区的实际大小。如果在输入指定的大小是大于零，但比所需的大小少，您不应该依靠返回的大小重新分配缓冲区。 Windows 2000中：如果缓冲区大小是在输入为零，函数返回ERROR_SUCCESS，不PDH_INSUFFICIENT_BUFFER。 mszInstanceList [out] 来电分配的缓冲区，它接收的空列表，终止指定的对象提供的实例名称。该清单包含唯一实例名称。这份名单是由两个终止NULL字符。设置为NULL，如果pcchInstanceListLength是零。 pcchInstanceListLength [ in , out ] 的大小mszInstanceList缓冲区，在TCHARs。如果零输入，该函数返回PDH_MORE_DATA，并设置此参数所需的缓冲区大小。如果缓冲区比所需的大小，功能设置此参数的时候，往往有人使用的缓冲区的实际大小。如果在输入指定的大小是大于零，但比所需的大小少，您不应该依靠返回的大小重新分配缓冲区。 Windows 2000: If the buffer size is zero on input, the function returns ERROR_SUCCESS, not PDH_INSUFFICIENT_BUFFER. 如果指定的对象不支持变量实例，然后返回的值是零。 If the specified object does support variable instances, but does not currently have any instances, then the value returned is 2, which is the size of an empty MULTI_SZ list string. dwDetailLevel [in] 演出详细的项目Level的回报。所有项目都指定详细程度或以下的将被退回(Level提高列出顺序)。此参数可以是下列值之一。 ValueMeaning PERF_DETAIL_NOVICENovice用户级别的细节。 详细PERF_DETAIL_ADVANCEAdvanced用户级别。 PERF_DETAIL_EXPERTExpert用户级别的细节。 PERF_DETAIL_WIZARDSystem细节设计Level。 dwFlags 此参数必须为零。 返回值 如果函数成功，它返回ERROR_SUCCESS。 如果函数失败，返回值是一个系统错误代码或一种PDH错误代码。以下是可能的值。 返回codeDescription PDH_MORE_DATAOne的缓冲区太小，无法遏制的名单。这个返回值，预计如果pcchCounterListLength或pcchInstanceListLength是在输入为零。如果在输入指定的大小是大于零，但比所需的大小少，您不应该依靠返回的大小重新分配缓冲区。 PDH_INVALID_ARGUMENTA参数无效。例如，在某些版本中您可以收到此错误如果在输入指定的大小是大于零但小于所需的大小。 PDH_MEMORY_ALLOCATION_FAILUREUnable分配内存支持这一功能。 PDH_CSTATUS_NO_MACHINEThe指定的计算机脱机或不可用。 PDH_CSTATUS_NO_OBJECTThe指定的对象找不到指定的计算机上或在指定的日志文件。 Windows 2000中：PDH_INSUFFICIENT_BUFFER可能是一个额外的返回值，这表明了一个缓冲区太小，无法遏制的名单。使用pcchCounterListLength和pcchInstanceListLength参数分配所需大小的缓冲区。请注意，缓冲区可能包含的名称的子集。 备注 您应该调用这个函数两次，第一次获得所需的缓冲区大小(设置为NULL的缓冲区和大小为0)，并第二次获得数据。 这一职能连续调用将返回计数器和实例相同的名单，因为PdhEnumObjectItems将始终质疑的最后调用PdhEnumObjects或PdhEnumObjectItems定义的性能对象列表。要刷新为TRUE bRefresh标志的值，然后再调用PdhEnumObjectItems再次表现对象，调用PdhEnumObjects名单。 该实例和反名字的顺序是不确定的。 实例 有关示例，请参见枚举进程对象。 要求： 最低支持：client－Windows 2000专业版 最低支持server－Windows 2000服务器 HeaderPdh.h LibraryPdh.lib DLLPdh.dll Unicode和ANSI namesPdhEnumObjectItemsW(Unicode)和PdhEnumObjectItemsA(ANSI)的 参见 PdhEnumObjectItemsH PdhEnumObjects 如果有任何问题和意见，请发送给微软(wsddocfb@microsoft.com) 生成日期：2009年7月23日 ＝＝英文原文＝＝PdhEnumObjectItems Function 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. Syntax C++ PDH_STATUS PdhEnumObjectItems( __in LPCTSTR szDataSource, __in LPCTSTR szMachineName, __in LPCTSTR szObjectName, __out LPTSTR mszCounterList, __inout LPDWORD pcchCounterListLength, __out LPTSTR mszInstanceList, __inout LPDWORD pcchInstanceListLength, __in DWORD dwDetailLevel, DWORD dwFlags ); Parameters szDataSource [in] Null-terminated string that specifies the name of the log file used to enumerate the counter and instance names. If NULL, the function uses the computer specified in the szMachineName parameter to enumerate the names. szMachineName [in] Null-terminated string that specifies the name of the computer that contains the counter and instance names that you want to enumerate. Include the leading slashes in the computer name, for example, \\\\computername. If the szDataSource parameter is NULL, you can set szMachineName to NULL to specify the local computer. szObjectName [in] Null-terminated string that specifies the name of the object whose counter and instance names you want to enumerate. mszCounterList [out] Caller-allocated buffer that receives a list of null-terminated counter names provided by the specified object. The list contains unique counter names. The list is terminated by two NULL characters. Set to NULL if the pcchCounterListLengthparameter is zero. pcchCounterListLength [in, out] Size of the mszCounterList buffer, in TCHARs. If zero on input, the function returns PDH_MORE_DATA and sets this parameter to the required buffer size. If the buffer is larger than the required size, the function sets this parameter to the actual size of the buffer that was used. If the specified size on input is greater than zero but less than the required size, you should not rely on the returned size to reallocate the buffer. Windows 2000: If the buffer size is zero on input, the function returns ERROR_SUCCESS, not PDH_INSUFFICIENT_BUFFER. mszInstanceList [out] Caller-allocated buffer that receives a list of null-terminated instance names provided by the specified object. The list contains unique instance names. The list is terminated by two NULL characters. Set to NULL if pcchInstanceListLength is zero. pcchInstanceListLength [in, out] Size of the mszInstanceList buffer, in TCHARs. If zero on input, the function returns PDH_MORE_DATA and sets this parameter to the required buffer size. If the buffer is larger than the required size, the function sets this parameter to the actual size of the buffer that was used. If the specified size on input is greater than zero but less than the required size, you should not rely on the returned size to reallocate the buffer. Windows 2000: If the buffer size is zero on input, the function returns ERROR_SUCCESS, not PDH_INSUFFICIENT_BUFFER. If the specified object does not support variable instances, then the returned value will be zero. If the specified object does support variable instances, but does not currently have any instances, then the value returned is 2, which is the size of an empty MULTI_SZ list string. dwDetailLevel [in] Detail level of the performance items to return. All items that are of the specified detail level or less will be returned (the levels are listed in increasing order). This parameter can be one of the following values. ValueMeaning PERF_DETAIL_NOVICENovice user level of detail. PERF_DETAIL_ADVANCEAdvanced user level of detail. PERF_DETAIL_EXPERTExpert user level of detail. PERF_DETAIL_WIZARDSystem designer level of detail. dwFlags This parameter must be zero. Return Value If the function succeeds, it returns ERROR_SUCCESS. If the function fails, the return value is a system error code or a PDH error code . The following are possible values. Return codeDescription PDH_MORE_DATAOne of the buffers is too small to contain the list of names. This return value is expected if pcchCounterListLength or pcchInstanceListLength is zero on input. If the specified size on input is greater than zero but less than the required size, you should not rely on the returned size to reallocate the buffer. PDH_INVALID_ARGUMENTA parameter is not valid. For example, on some releases you could receive this error if the specified size on input is greater than zero but less than the required size. PDH_MEMORY_ALLOCATION_FAILUREUnable to allocate memory to support this function. PDH_CSTATUS_NO_MACHINEThe specified computer is offline or unavailable. PDH_CSTATUS_NO_OBJECTThe specified object could not be found on the specified computer or in the specified log file. Windows 2000: PDH_INSUFFICIENT_BUFFER is an additional possible return value, which indicates that one of the buffers is too small to contain the list of names. Use the pcchCounterListLength and pcchInstanceListLength parameters to allocate the required size buffers. Note that the buffer may contain a subset of the names. Remarks You should call this function twice, the first time to get the required buffer size (set the buffers to NULL and the sizes to 0), and the second time to get the data. Consecutive calls to this function will return identical lists of counters and instances, because PdhEnumObjectItems will always query the list of performance objects defined by the last call to PdhEnumObjects or PdhEnumObjectItems. To refresh the list of performance objects, call PdhEnumObjects with a bRefresh flag value of TRUE before calling PdhEnumObjectItems again. The order of the instance and counter names is undetermined. Examples For an example, see Enumerating Process Objects . Requirements Minimum supported clientWindows 2000 Professional Minimum supported serverWindows 2000 Server HeaderPdh.h LibraryPdh.lib DLLPdh.dll Unicode and ANSI namesPdhEnumObjectItemsW (Unicode) and PdhEnumObjectItemsA (ANSI) See Also PdhEnumObjectItemsH PdhEnumObjects Send comments about this topic to Microsoft Build date: 7/23/2009 ＝＝原始网址＝＝http://msdn.microsoft.com/en-us/library/aa372595(VS.85).aspx\n |
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