void getTimes()
{
const int buffer_size = 256;
static char strTime[buffer_size] = {0};
timeCurrentTime = (GetTickCount() * 0.001f);
timeElapsedTime = timeCurrentTime - timeDemoStartTime;
sprintf_s(strTime, buffer_size, "Time: %0.3f", timeElapsedTime);
timeElapsedTxt = strTime;
}
Game / Lap timer need
Author
Any one help with a game / lap timer ?
I can get the time / elapsed time etc etc, for diplaying Frame rate
This is C++/OpenGL by the way
Pretty basic, but work for FPS and a basic 'elapsed time' diplay.
But obviously this just continues to run from 00.000 seconds to 60.000 .. 70.000 etc
Where after 60 seconds, I should really display minutes !!
Anyone got a simple example of getting a timer/clock in hours,minutes,seconds,milliseconds. (HH:MM:SS:nnn)
Sorry C++ noobie, never worked with timers yet
That isn't C++, it's C. Also it would probably be easier to do this with integers then floats. I see no reason why you would store milliseconds/seconds/minutes/etc.. as floats.
Anyway if you can get the number of milliseconds the rest should look like this:
Anyway if you can get the number of milliseconds the rest should look like this:
int Milliseconds = <insert fucntion here>; // note this is milliseconds from program startint Seconds = Milliseconds / 1000;int Minutes = Seconds / 60;int Hours = Minutes / 60;etc..Milliseconds %= 1000;Seconds %= 60;Minutes %= 60;Hours %= 24;(there's probably a much better way to do this)
Author
OH !!
Can you explain what the difference in the code is here then.
I am just going by many examples and tutorials, on here, and NeHe's examples for OpenGL.
Could you show some better c++ source for this ;-)
Can you explain what the difference in the code is here then.
I am just going by many examples and tutorials, on here, and NeHe's examples for OpenGL.
Could you show some better c++ source for this ;-)
Well your C function in C++ might look like this:
NeHe's tutorials are a good OpenGL reference, but I would suggest not learning C++ programming off them. His early ones are entirely in C and the later ones are a horrible mix of C and C++ code. Sometimes he puts in C++ code and never even uses it(usually strings).
std::string getTimes() { timeCurrentTime = ( GetTickCount() * 0.001f ); timeElapsedTime = timeCurrentTime - timeDemoStartTime; std::stringstream ss; // I forget how to set it to 3 decimal places, but it is possible ss << "Time: " << timeElapsedTime; return stringstream.str();}NeHe's tutorials are a good OpenGL reference, but I would suggest not learning C++ programming off them. His early ones are entirely in C and the later ones are a horrible mix of C and C++ code. Sometimes he puts in C++ code and never even uses it(usually strings).
Author
Thanks Scet,
that worked once I'd figured out return was actually
ss.scr()
and not return
stringstream.str();
Thanks, so now my question is, should I use string for everything, dumb question but what's the difference between string and char.
when should I use each one?
for example following some tutorials, on things like we just covered.. ie displaying time, FPS, score, health or whatever .. should I use strings.
what about when I use a loadTexture(GLuint texture, char filename) to load textures for my openGL, or CreateGLWindow(char* title, int width, int height)
again shoud I be using strings or chars ?
that worked once I'd figured out return was actually
ss.scr()
and not return
stringstream.str();
Thanks, so now my question is, should I use string for everything, dumb question but what's the difference between string and char.
when should I use each one?
for example following some tutorials, on things like we just covered.. ie displaying time, FPS, score, health or whatever .. should I use strings.
what about when I use a loadTexture(GLuint texture, char filename) to load textures for my openGL, or CreateGLWindow(char* title, int width, int height)
again shoud I be using strings or chars ?
Quote:for everything, dumb question but what's the difference between string and char.
A char variable represents a single character, such as a single letter or symbol. A string are multiple characters. With a char array you can also use multiple characters. Generally a string is represented as an array of characters. And then there is a char pointer (char * ptr_p)
www.nextdawn.nl
Quote:Original post by dazedandconfused
Thanks, so now my question is, should I use string for everything, dumb question but what's the difference between string and char.
when should I use each one?
std::string is safer then char pointers because it's an actual object, it can manage it's length itself so there are no buffer overrun problems. std::string also has operator overloading, you can add on to it like it was a normal variable.
Example:
Cchar buffer[10]; strcpy( buffer, "Hello " );strcat( buffer, "World" ); // buffer overflows causing undefined behaviourC++std::string buffer = "Hello ";buffer += "World"; // no problemsSo if you want to use C++, use std::string for actually strings and use char*s when you need a char pointer/array(probably not very often). Plus using the standard library adds a lot more functionallity then just strings.
Quote:
what about when I use a loadTexture(GLuint texture, char filename) to load textures for my openGL, or CreateGLWindow(char* title, int width, int height)
again shoud I be using strings or chars ?
If you made those functions yourself, yes you should change them to strings. If however you're calling functions from a library that only accepts char*s, use the .c_str() function.
std::string Title = "Hello World";SomeOldFunction( Title.c_str() );Note that this returns a const char*, because the strings internal data shouldn't be messed with.
dazedandconfused, I have a feeling your code right now is pretty much in C. If you want/wanted to learn C++, buy a book or take a look at C++ Workshop Forum.
Author
Scet,
Thanks, that's AWESOME.
You explained that well !
And yeah, I noticed that most of what I have learned seems to be 'C'
About time I got a new book hey !
I have programmed in Pascal for some time, and taking the leap to C/C++.
Thanks for the advice though [wink]
I will get either Accelerated C++, or C++ Primer, which would you suggest, as they seems the best 2 books, and also listed in the GameDev Book Section.
Wow a noobie, that actually searched, or looked at the FAQ .. it's a miracle
Yes and a noob, who's just hacking away at C/C++ lol.
I have Dave Astle's 'Beginning OpenGL' and to be honest the word 'string' is never mentioned !
And it is aimed at C++ .. go figure !
Thanks, that's AWESOME.
You explained that well !
And yeah, I noticed that most of what I have learned seems to be 'C'
About time I got a new book hey !
I have programmed in Pascal for some time, and taking the leap to C/C++.
Thanks for the advice though [wink]
I will get either Accelerated C++, or C++ Primer, which would you suggest, as they seems the best 2 books, and also listed in the GameDev Book Section.
Wow a noobie, that actually searched, or looked at the FAQ .. it's a miracle
Yes and a noob, who's just hacking away at C/C++ lol.
I have Dave Astle's 'Beginning OpenGL' and to be honest the word 'string' is never mentioned !
And it is aimed at C++ .. go figure !
Quote:Original post by dazedandconfused
I will get either Accelerated C++, or C++ Primer, which would you suggest, as they seems the best 2 books, and also listed in the GameDev Book Section.
I wouldn't know, I don't actually use C++. There's a free book called Thinking in C++ though.
Quote:Original post by dazedandconfused
I have Dave Astle's 'Beginning OpenGL' and to be honest the word 'string' is never mentioned !
And it is aimed at C++ .. go figure !
OpenGL and Win32(which the book also uses) are both C libraries, so they probably made it to work for C programmers as well. C++ is backwards compatible with C, you can still use C fucntions in C++. However sometimes there is a better, "more C++" alternative like with strings and other standard library functions.
Author
Did someone say "FREE" !!
I'm totally there dude !!
Thanks again, you've been a GREAT help
This topic is closed to new replies.
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