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francoiste
Joined: 03 Dec 2011
Posts: 5
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 Posted: Sat Dec 03, 2011 1:21 pm Post subject: request for pdh.dll |
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this is a request for pdh.dll
i searched through all of the web.
and nowhere i'm able to find a working example for PdhLookupPerfNameByIndex getting invoked from csharp.
cheers, francoiste |
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Brian Donahue
Joined: 23 Aug 2004
Posts: 6344
Location: Red Gate Software
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| Posted: Mon Dec 05, 2011 10:42 am Post subject: |
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Hello,
As a PInvoke wiki administrator, I can add the pdh module to the list of modules, but someone is going to have to contribute a signature for the PdhLookupPerfNameByIndex method. Any takers?
_________________
Brian Donahue
Technical Support
Red Gate Software Ltd.
44 (0)870 160 0037 ext 8521
US and CAN 1-866-RED GATE ext 8521 |
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francoiste
Joined: 03 Dec 2011
Posts: 5
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| Posted: Mon Dec 05, 2011 11:30 am Post subject: |
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thanks, brian!
regarding the native signature:
the requested method PdhLookupPerfNameByIndex and all related Pdh* methods are documented here:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa372648%28v=vs.85%29.aspx
so you can maybe get it from there?
as mentioned earlier. i tried various approaches but never got it running. so i'm hoping to get the PDH modules added to the PInvoke wiki - maybe someone will also post a working example. |
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francoiste
Joined: 03 Dec 2011
Posts: 5
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| Posted: Tue Dec 06, 2011 4:23 pm Post subject: |
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just wanted to share with everyone: in the meantime i got it working 
1) native signature
| Code: |
PDH_STATUS PdhLookupPerfNameByIndex(
__in LPCTSTR szMachineName,
__in DWORD dwNameIndex,
__out LPTSTR szNameBuffer,
__in LPDWORD pcchNameBufferSize
); |
2) pinvoke
| Code: |
[DllImport( "pdh.dll", SetLastError = true, CharSet = CharSet.Unicode )]
public static extern UInt32 PdhLookupPerfNameByIndex(string szMachineName, uint dwNameIndex, StringBuilder szNameBuffer, ref uint pcchNameBufferSize);
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3) example
| Code: |
const uint iProcessorQueueLength = 44;
StringBuilder buffer = new StringBuilder(1024);
uint bufSize = (uint)buffer.Capacity;
UInt32 iRet = 0;
iRet = PdhLookupPerfNameByIndex(null, iProcessorQueueLength, buffer, ref bufSize);
Console.WriteLine(buffer.ToString());
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francoiste
Joined: 03 Dec 2011
Posts: 5
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| Posted: Wed Aug 01, 2012 5:28 pm Post subject: |
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as i just figured out how this wiki works i went ahead and added the signature myself.
thanks again, francoiste |
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