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QueryPerformanceCounter
- Thread starter sonnur
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- #3
Hi strongm,
I think I have made a mistake while I was using the QueryPerformanceCounter.For now it is ok and I can have the exact time that I expect.But I still don't know why there is a hardware problem when a user uses QueryPerformanceCounter.Which people can't use this API?Is it about OS?
Thanks
Sonnur
I think I have made a mistake while I was using the QueryPerformanceCounter.For now it is ok and I can have the exact time that I expect.But I still don't know why there is a hardware problem when a user uses QueryPerformanceCounter.Which people can't use this API?Is it about OS?
Thanks
Sonnur
Sorry for the delay in replying, but I've been away.
No, it is not an OS issue, it is a hardware issue. If you issue a QueryPerformanceFrequency call before using QueryPerformanceCounter (and you should use it at least once), it may return 0, which indicates a failure. Whilst you could then use GetLastError for specific info, you will normally find that the failure is caused by the fact the hardware does not actually have a high-resolution performance counter available.
No, it is not an OS issue, it is a hardware issue. If you issue a QueryPerformanceFrequency call before using QueryPerformanceCounter (and you should use it at least once), it may return 0, which indicates a failure. Whilst you could then use GetLastError for specific info, you will normally find that the failure is caused by the fact the hardware does not actually have a high-resolution performance counter available.
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