In a previous article I described how this is done (you might want to go read that before continuing on here). Step 2: How to Use a Windows API Function within Excel VBA So to measure time with milliseconds accuracy, we calculate this formula: (“End Performance Counter” – “Start Performance Counter” ) / Performance Frequency. Excellent! So we can use two Win32 APIs QueryPerformanceFrequencyfunction to express the frequency (in counts per second) and the QueryPerformanceCounter function to retrieve the current value of the high-resolution performance counter. However, looking at native VBA and Excel time related functions they only provide up to seconds accuracy.Ī web search on “timers using Windows API” eventually lead to this documentation on high resolution timers in Win32 APIs. Ideally this timer should be able to measure up to millisecond resolutions. Our motivations to create a millisecond timers is to allow us to measure the execution time for a piece of VBA code. In this tutorial, not only I will show the complete VBA codes that you can simply copy and use, I will describe the research process involved to create millisecond timers in VBA using Windows APIs so that you can deepen your understanding of using Windows APIs with VBA coding. There are numerous sites that provide sample VBA codes for creating millisecond resolution timers. Step 1: Search for the Right Windows API to solve a problem
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