How to display a picture or draw a single point with C Standard Library?

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I am a student from China,this is the first time I visit this great website:).
My question is:
How to display a picture or draw a single point with C Standard Library?
The codes must can be complied by dev-cpp(gcc),and can run in windows.
I find these codes,but they can display a char (In my opinion,if it can display a char ,I can use it to display a picture :)).

unsigned char *screen=(unsigned char *)0xb8000;
void putch(char ch,char color, int x, int y)
{
  unsigned char *temp=screen;
   temp+=+(80*y+x)*2;  
   *temp++=ch;  
   *temp=color;  
}

Thanks!!!

Posted 13-Apr-10 11:19am

icemornings

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2 solutions

Solution 2

The C standard library is a set of function to manage raw text and handle simple input / output.
There is no "graphic" in it.

The code you provide is an implementation of a generalization of putch function (that puts a characted on the standrd output) that operates on Text-Mode color displays. (Today they exist as "virtual" into a graphic context, that's hidden by the operating system)

If you really want to do graphics, you should interact with the underlying operating system using proper API - not so easy for a beginner: lots of concepts behind, and very good knoweledge of C at all levels (one thing to make you scary: pointer to functions), or using multi platform libraries (WxWidgets, GTK, QT to tell just a bunch of them) providing their own API and implementing themselves the mapping toward the underlying OS.

I suggest you to read some "Windows Programming" books or tutorials (just google for them) just to make an idea on what I mean.

Posted 15-Apr-10 21:13pm

Emilio Garavaglia

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Christian Graus · Accepted Answer · 2010-04-13T12:08:00

Solution 1

Your opinion is wrong. C++ has NO facilities for graphics, windows, etc. Nor does C. C was developed to run on systems that were text only. Even C++ is designed to not require a system to have a graphical interface. What you want, cannot be done.

Posted 13-Apr-10 12:08pm

Christian Graus