通过winreg找到perfmon计数器id [英] Finding perfmon counter id via winreg

问题描述

我有一个应用程序通过在winreg.h暴露的API收集Perfmon计数器值 - 为了收集Perfmon计数器值我必须调用 RegQueryValueExW 传入我感兴趣的Perfmon计数器的id，为了获得该ID，我需要查询注册表的Perfmon计数器名称列表，并通过寻找我感兴趣的一个

C ++不是我选择的语言，所以下面是一个可疑的例子，可能有很多语法错误，但你得到的想法：

  DWORD IdProcessIndex = 0; 
 WCHAR * RawStrings = new WCHAR [len]; 
 WCHAR * pCurrent; 
 DWORD nLenInChars; 
 
 //获取ID进程计数器的名称ID 
 RegQueryValueExW（HKEY_PERFORMANCE_DATA，COUNTER009，0，0，（PBYTE）RawStrings，& len）
 
 pCurrent =（WCHAR *）RawStrings; 
 while（（nLenInChars = wcslen（pCurrent））！= 0&&& IdProcessIndex == 0）
 {
 WCHAR * pName; 
 pName = pCurrent + nLenInChars + 1; 
 
 if（wcscmp（pName，LID Process）== 0）
 {
 IdProcessIndex = _wtoi（pCurrent）; 
} 
 
 pCurrent = pName + wcslen（pName）+ 1; 
} 
 
 //获取ID进程计数器的数据
 WCHAR strIdProcessIndex [32]; 
 _itow（nIdProcessIndex，strIdProcessIndex，10）; 
 
 RegQueryValueExW（HKEY_PERFORMANCE_DATA，strIdProcessIndex，NULL，NULL，（PBYTE）pData，& len）
  

b $ b

麻烦的是，在一些机器（安装了Windows CE开发套件的机器），有一个名为ID进程的第二个perfmon计数器，因此上面的查找错误的计数器的ID。 p>

我看不到任何方法来区分两者，而不是他们的顺序 - 在这一刻，我认为我最好的赌注是采取我找到的第一个计数器一个匹配的名字，有更好的选择吗？

（不可能迁移到.Net或类似的东西）

解决方案

我意识到这是旧的，但如果它有帮助：

1. Tim是对的，自己解析二进制数据很困难。准备自己一个痛苦的世界。我建议PDH（封装你的注册表访问），或者如果失败，WMI（虽然注意WMI是更慢）。


2. 你不能获取数据只是一个性能计数器（ ID Process ，索引 784 ）。您需要获取整个对象（ Process ，索引 230 ）。


3. 内置对象的ID在所有Windows安装中均为保证相同。所以如果这是你需要的唯一计数器，只需使用 230 。 ：）

I have an app that collects Perfmon counter values through the API exposed in winreg.h - in order to collect Perfmon counter values I must make a call to RegQueryValueExW passing in the id of the Perfmon counter I'm interested in, and in order to obtain that ID I need to query the registry for the list of Perfmon counter names and go through looking for the one I'm interested in

C++ isn't my language of choice, so the following is a shaky example, probably with lots of syntax errors but you get the idea:

DWORD IdProcessIndex = 0;
WCHAR* RawStrings = new WCHAR[ len ];
WCHAR* pCurrent;
DWORD nLenInChars;

// Get the name id of the "ID Process" counter
RegQueryValueExW(HKEY_PERFORMANCE_DATA, COUNTER009, 0, 0, (PBYTE)RawStrings, &len)

pCurrent = (WCHAR*)RawStrings;
while ( (nLenInChars = wcslen(pCurrent)) != 0 && IdProcessIndex == 0 )
{
    WCHAR* pName;
    pName = pCurrent + nLenInChars + 1;

    if ( wcscmp( pName, L"ID Process" ) == 0)
    {
        IdProcessIndex = _wtoi( pCurrent );
    }

    pCurrent = pName + wcslen( pName ) + 1;
}

// Get data for the "ID Process" counter
WCHAR strIdProcessIndex[32];
_itow( nIdProcessIndex, strIdProcessIndex, 10 );

RegQueryValueExW(HKEY_PERFORMANCE_DATA, strIdProcessIndex, NULL, NULL, (PBYTE)pData, &len)

Trouble is that on some machines (ones with the Windows CE dev kit installed) there is a second perfmon counter with the name "ID Process", and so the above finds the ID of the wrong counter.

I cant see any way to differentiate between the two other than the order that they are in - at the moment I think my best bet is to take the first counter that I find with a matching name, is there a better option?

(Its not possible to migrate this to .Net or anything like that)

解决方案

I realize that this is old, but in case it helps:

1. Tim is right, parsing the binary data yourself is difficult. Prepare yourself for a world of pain. I'd recommend PDH (encapsulates the registry accesses for you), or if that fails, WMI (though note that WMI is much slower).
2. You cannot get data for just a performance counter (ID Process, with index 784). You need to get it for the whole object (Process, with index 230).
3. The IDs for built in objects are guaranteed to be the same on all Windows installations. So if this is the only counter you need, just use 230. :)

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