microseconds tick count or hi resolution timing

[neoaspilet11]

tickcount resolution

Hello guys,

Is there any function or API in Windows/visual basic that does return tick count in microseconds or even just a fraction of a millisecond. The current getTickCount function in Windows returms tick count in millisecond only. My applciations needs to measure timing in 50 - 60 microsend range. The signal lines of my application will be connected to teh parallel port of the host PC.

Thanks for any thoughts,
Jack

 

[echo47]

microseconds+vb6

QueryPerformanceCounter
QueryPerformanceFrequency

They normally use either the multimedia timer or the CPU clock cycle counter.

Update: Another method is to use the rdtsc assembler opcode. It directly reads the CPU clock cycle counter without having to call the operating system. However, older CPUs don't support this opcode, and you need to find some way of determining the CPU clock rate so you can calculate elapsed time.

 

[neoaspilet11]

counting microseconds in windows

echo47, this is a very great function. Thanks.