How to write __int64 to file in 32 bit program ?

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Hi,

I am using QuerryPerformanceCounter to measure performance of the Application. It takes __int64 as a out parameter. I need to write it in the file. How to do it. ??

Posted 18-Jul-11 22:02pm

PrafullaVedante

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Emilio Garavaglia 19-Jul-11 5:00am

It depends on what you're going to use that file. It can be a binary dump, a textual form, a compressed encode...
Elaborate much more your question

PrafullaVedante 19-Jul-11 5:11am

Hie ...
I got the answer i am using %I64d in fprintf.

Thanks anyways.

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Richard MacCutchan · Answer 1 · 2011-07-18T23:02:00

Solution 2

LARGE_INTEGER performanceCount;
if (QueryPerformanceCounter(&performanceCount))
{
    fwrite(&performanceCount, sizeof performanceCount, 1, fileStream);
}

or similar.

Posted 18-Jul-11 23:02pm

Richard MacCutchan

Comments

Espen Harlinn 19-Jul-11 5:11am

My 5 - btw: the parenthesis for the sizeof operator is missing ...

Richard MacCutchan 19-Jul-11 5:32am

parenthesis for the sizeof operator is missing
No, they are not necessary in the above case; try it out. See also here

PrafullaVedante 19-Jul-11 5:11am

I got the answer i am using %I64d in fprintf.

Richard MacCutchan 19-Jul-11 5:33am

Maybe if you had explained that you wanted to print the number, rather than write in a file, we might have given a better answer.

PrafullaVedante 22-Jul-11 3:36am

Sorry boss ;) :) Thanks anyways

hakz.code · Answer 2 · 2011-07-18T23:00:00

Solution 1

Hi,

FILE *fptr = NULL;
 if(fopen_s(&fptr,"Sample.txt","w") != 0){
     cout << "Could not open file";
 }
 __int64 a=10;
     QueryPerformanceCounter((LARGE_INTEGER*)&a);
 char    b[255];
 sprintf_s(b,255,"%d",a);
 fprintf_s(fptr,"%s",b);
 fclose(fptr);

The code above writes the __int64 to a file,are you facing any issues in writing __int64 which is returned by QueryPerformanceCounter?

Posted 18-Jul-11 23:00pm

hakz.code

Comments

PrafullaVedante 19-Jul-11 5:11am

I got the answer i am using %I64d in fprintf.

hakz.code 19-Jul-11 5:20am

Ok..so %I64 format specifier needs to be used in case of __int64.Thank you I actually forgot it in my code.

Richard MacCutchan 19-Jul-11 5:36am

This is incorrect, the %d format selector will not print a 64 bit number. And why convert the integer to a string and then use fprintf() to write the string to the file? Just use fprintf() direct from integer to the file.

hakz.code 19-Jul-11 6:08am

Yes!agreed