C++ Tick timer

Hello,

I need to measure the time taken between 2 functions being called...

startTimer();
endTimer();

that's basically it, i have no Real idea where to start. ;D please help Me, thanks.

Have a look at GetTickCount example.

DWORD GetTickCount(void);

float FloatCalc()
{
return A+B;
}

void startTimer()
{
tstart = GetTickCount();
}
void endTimer()
{
tend = GetTickCount();
TimeElapsed = (tend - tstart) / 1000;
}




1>------ Build started: Project: Calculation, Configuration: Debug Win32 ------
1> main.cpp
1>e:\programming\c++ projects\c++\calculation\calculation\main.cpp(9): warning C4305: 'initializing' : truncation from 'double' to 'const float'
1>e:\programming\c++ projects\c++\calculation\calculation\main.cpp(10): warning C4305: 'initializing' : truncation from 'double' to 'const float'
1>e:\programming\c++ projects\c++\calculation\calculation\main.cpp(20): error C2373: 'GetTickCount' : redefinition; different type modifiers
1> c:\program files (x86)\microsoft sdks\windows\v7.0a\include\winbase.h(5651) : see declaration of 'GetTickCount'
1>e:\programming\c++ projects\c++\calculation\calculation\main.cpp(30): error C2440: '=' : cannot convert from 'DWORD (__stdcall *)(void)' to 'long'
1>e:\programming\c++ projects\c++\calculation\calculation\main.cpp(30): error C2440: '=' : cannot convert from 'DWORD (__stdcall *)(void)' to 'long'
1> There is no context in which this conversion is possible
1>e:\programming\c++ projects\c++\calculation\calculation\main.cpp(30): error C3861: 'GetTickCount': identifier not found
1>e:\programming\c++ projects\c++\calculation\calculation\main.cpp(34): error C2440: '=' : cannot convert from 'DWORD (__stdcall *)(void)' to 'long'
1>e:\programming\c++ projects\c++\calculation\calculation\main.cpp(34): error C2440: '=' : cannot convert from 'DWORD (__stdcall *)(void)' to 'long'
1> There is no context in which this conversion is possible
1>e:\programming\c++ projects\c++\calculation\calculation\main.cpp(34): error C3861: 'GetTickCount': identifier not found
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

First of all, you don't need to declare GetTickCount function in your own program.
It's already declared in <winbase.h>

Since you are using Windows, you can use the performance counter.

Code:

---

#include <windows.h>
#include <iostream>

unsigned long long GetPerformanceTicks();
unsigned long long GetPerformanceTicksInSecond();
double GetTickSeconds(unsigned long long nTicks,unsigned long long nFreq);
unsigned long long GetTickMilliseconds(unsigned long long nTicks,unsigned long long nFreq);
unsigned long long GetTickMicroseconds(unsigned long long nTicks,unsigned long long nFreq);

int main(int argc,char * argv)
{
    unsigned long long nFreq = GetPerformanceTicksInSecond();
    unsigned long long nBefore = GetPerformanceTicks();

    CallSomeFunction();

    unsigned long long nAfter = GetPerformanceTicks();

    const unsigned long long nDiff = nAfter - nBefore;

    const unsigned long long nMicroseconds = GetTickMicroseconds(nTicks,nFreq);

    std::cout << "CallSomeFunction() took" << nMicroseconds << std::endl;

    return 0;
}

unsigned long long GetPerformanceTicks()
{
    LARGE_INTEGER nValue;

    ::QueryPerformanceCounter(&nValue);

    return nValue.QuadPart;
}

unsigned long long GetPerformanceTicksInSecond()
{
    LARGE_INTEGER nFreq;

    ::QueryPerformanceFrequency(&nFreq);

    return nFreq.QuadPart;
}

double GetTickSeconds(unsigned long long nTicks,unsigned long long nFreq)
{
    return static_cast<double>(nTicks) / static_cast<double>(nFreq);
}

unsigned long long GetTickMilliseconds(unsigned long long nTicks,unsigned long long nFreq)
{
    unsigned long long nTicksInMillisecond = nFreq / 1000;

    return nTicks / nTicksInMillisecond;
}

unsigned long long GetTickMicroseconds(unsigned long long nTicks,unsigned long long nFreq)
{
    unsigned long long nTicksInMicrosecond = nFreq / 1000000;

    return nTicks / nTicksInMicrosecond;
}

---