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Plz Try this code:

class ofxMidiEventArgs: public ofEventArgs{
public:
int port;
int channel;
int status;
int byteOne;
int byteTwo;
double timestamp;
};

#define kMTCFrames 0
#define kMTCSeconds 1
#define kMTCMinutes 2
#define kMTCHours 3

// callback for when a midi message is received
void newMidiMessage(ofxMidiEventArgs& eventArgs){

if(eventArgs.status == 240) { // if this is a MTC message...
// these static variables could be globals, or class properties etc.
static int times[4] = {0, 0, 0, 0}; // this static buffer will hold our 4 time componens (frames, seconds, minutes, hours)
static char *szType = ""; // SMPTE type as string (24fps, 25fps, 30fps drop-frame, 30fps)
static int numFrames = 100; // number of frames per second (start off with arbitrary high number until we receive it)

int messageIndex = eventArgs.byteOne >> 4; // the high nibble: which quarter message is this (0...7).
int value = eventArgs.byteOne & 0x0F; // the low nibble: value
int timeIndex = messageIndex>>1; // which time component (frames, seconds, minutes or hours) is this
bool bNewFrame = messageIndex % 4 == 0;


// the time encoded in the MTC is 1 frame behind by the time we have received a new frame, so adjust accordingly
if(bNewFrame) {
times[kMTCFrames]++;
if(times[kMTCFrames] >= numFrames) {
times[kMTCFrames] %= numFrames;
times[kMTCSeconds]++;
if(times[kMTCSeconds] >= 60) {
times[kMTCSeconds] %= 60;
times[kMTCMinutes]++;
if(times[kMTCMinutes] >= 60) {
times[kMTCMinutes] %= 60;
times[kMTCHours]++;
}
}
}
printf("%i:%i:%i:%i | %s\n", times[3], times[2], times[1], times[0], szType);
}


if(messageIndex % 2 == 0) { // if this is lower nibble of time component
times[timeIndex] = value;
} else { // ... or higher nibble
times[timeIndex] |= value<<4;
}


if(messageIndex == 7) {
times[kMTCHours] &= 0x1F; // only use lower 5 bits for hours (higher bits indicate SMPTE type)
int smpteType = value >> 1;
switch(smpteType) {
case 0: numFrames = 24; szType = "24 fps"; break;
case 1: numFrames = 25; szType = "25 fps"; break;
case 2: numFrames = 30; szType = "30 fps (drop-frame)"; break;
case 3: numFrames = 30; szType = "30 fps"; break;
default: numFrames = 100; szType = " **** unknown SMPTE type ****";
}
}
}
}
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#include "stdafx.h"

#include <iostream>

#include <ctime>

#include <string>

#include <sstream>

#include <math.h>



#pragma unmanaged // generate native code


void double_to_string()

{

std::clock_t start = std::clock() ;

for(int i = 0; i < 2000000; i++)

{

double Number1 = 8.12;

static std::string Num;

static std::stringstream v1;

v1 << Number1;

v1 >> Num;

}

std::clock_t end = std::clock() ;

std::cout << "double_to_string: "

<< double( end-start ) / CLOCKS_PER_SEC << '\n' ;
}
.
#pragma managed



#pragma unmanaged // generate native code

void string_to_double()

{

std::clock_t start = std::clock() ;

for(int i = 0; i < 2000000; i++)

{

double Number1 ;

static std::string Num = "8.12" ;

static std::stringstream v1;

v1 << Num;

v1 >> Number1;

}

std::clock_t end = std::clock() ;

std::cout << "string_to_double: "

<< double( end-start ) / CLOCKS_PER_SEC << '\n' ;

}

#pragma managed



#pragma unmanaged // generate native code

void cstrng_to_double()

{

std::clock_t start = std::clock() ;
for(int i = 0; i < 2000000; i++)

{

double Number1 ;

const char* Num = "8.12";

Number1 = std::atof(Num);

}

std::clock_t end = std::clock() ;

std::cout << "cstrng_to_double: "

<< double( end-start ) / CLOCKS_PER_SEC << '\n' ;

}

#pragma managed



int main( array< System::String^ >^ args )

{

for( int i=0 ; i<4 ; ++i )

{

double_to_string() ;

string_to_double() ;

cstrng_to_double() ;

std::cout << '\n' ;

}

}

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