#Ms excel vba tutorial how to#
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'Purpose: Sample code to measure elapsed time in milliseconds IвЂ™m assuming you are an intermediate VBA coder and already have the codes copied and placed in a VBA code module.

#Ms excel vba tutorial how to#

I think it will benefit you further if I explained how to use the VBA codes in your own projects.

LgResult = QueryPerformanceFrequency(curFrequency)Дebug.Print 'Elapsed time (ms): ' & (curEndCounter - curStartCounter) / curFrequencyД®nd Sub How to use the Excel VBA codes in your projects LgResult = QueryPerformanceCounter(curEndCounter) LgResult = QueryPerformanceCounter(curStartCounter) 'Purpose: Measure elapsed time in milliseconds

#Ms excel vba tutorial download#

You can download the Excel workbook with the millisecond timer VBA codes to save bit of time.Д«est-milliseconds-timers-Excel-VBA Download Option ExplicitДeclare PtrSafe Function QueryPerformanceCounter Lib 'kernel32' (lpPerformanceCount As Currency) As LongДeclare PtrSafe Function QueryPerformanceFrequency Lib 'kernel32' (lpFrequency As Currency) As LongДeclare Function QueryPerformanceCounter Lib 'kernel32' (lpPerformanceCount As Currency) As LongДeclare Function QueryPerformanceFrequency Lib 'kernel32' (lpFrequency As Currency) As Long

#Ms excel vba tutorial windows#

So letвЂ™s put these 2 Windows API function declarations at the top of a code module and use it to measure elapsed time in seconds but with milliseconds accuracy. ' Performance counter API'sДeclare PtrSafe Function QueryPerformanceCounter Lib 'kernel32' _ДЄlias 'QueryPerformanceCounter' (lpPerformanceCount As Currency) As LongДeclare PtrSafe Function QueryPerformanceFrequency Lib 'kernel32' _ДЄlias 'QueryPerformanceFrequency' (lpFrequency As Currency) As Long The Complete VBA Code for Millisecond Timer Using Windows APIs So we can change the declarations slightly to use the native VBA 64-bit integer data type Currency. A quick web search on the phrase вЂњWindows API LARGE_INTEGERвЂќ tells us that it вЂњRepresents a 64-bit signed integer valueвЂќ. If we use this declaration as it is, VBA will give us a compile error: вЂњUser-defined type not definedвЂќ. Notice that the arguments to both Windows APIs have the data type LARGE_INTEGER. 'QueryPerformanceFrequency' (lpFrequency As LARGE_INTEGER) As Long What is this LARGE_INTEGER ? 'QueryPerformanceCounter' (lpPerformanceCount As LARGE_INTEGER) As LongДeclare PtrSafe Function QueryPerformanceFrequency Lib 'kernel32' Alias _

A quick search for вЂњ QueryPerformanceFrequencyвЂќ and вЂњ QueryPerformanceCounterвЂќ in the text file вЂњ Win32API_PtrSafe.TXTвЂќ which is the list of Windows API function declarations for VBA yielded this: ' Performance counter API'sДeclare PtrSafe Function QueryPerformanceCounter Lib 'kernel32' Alias _ 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: (вЂњEnd Performance CounterвЂќ вЂ“ вЂњStart Performance CounterвЂќ ) / 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.ДЄ web search on вЂњtimers using Windows APIвЂќ 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