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Coding challenge


snakey
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  • 2 months later...

i think a new thread would be good too, i think i suggested that a long time ago.

the game sounds, ok, but needs more detail, and the idea of making extra challenges like certain about of lines, or a limit of size and stuff would be fun.

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  • 2 weeks later...

Code Challenge - Starts 8/11/09 - Ends 8/31/09

Write a program in C that changes the desktop background of a Windows XP machine.

Requirements:

1 - Must take command line argument for file path of image (i.e. C:\image.bmp)

2 - Program must not crash on invalid input

3 - Changes must take affect, (at the very latest) on reboot.

Winner is the person who's program uses the fewest characters (white space doesn't count).

Hint

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Ok, i 'm done with the coding. Should i upload the executable and put a link in here or is there any other procedure?

Just post source code, no bins.

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Well, its one of the options. But it took me less than 30min to code this one so, if someone gets the code, he can alter it in no-time. So ether we post the bins and the code when the voting is over, or the one that sets the challenge takes the code and posts it for voting. ^_^

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Well, its one of the options. But it took me less than 30min to code this one so, if someone gets the code, he can alter it in no-time. So ether we post the bins and the code when the voting is over, or the one that sets the challenge takes the code and posts it for voting. ^_^

Agreed, post screen shots, source code on the last day. I'd still prefer no bins.

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I already have an Idea for the next challenge which should be doable in all languages.

Oh and maybe at the end of the contest the winner of the challenge could post their compiled piece of software cuz not everbody has a c++ compiler or an assembler or knows how to use them.

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-.-' i suck ass at C, the concept is easy enough and i can do it / have it working perfect, just not in C. So if no one else has interest bar corcrash, can the source be posted and we move on to an open language contest with no silly restraints like limited lines / characters which is just bad programming.

Your taught to worry about complexity, and mem managment, not file size of your source.

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#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <string.h>

char image[255];
FILE *file;

int main(int argc, char *argv[])
{
    HKEY hKey;
    
    strcpy(image, argv[1]);
            
    if((file = fopen(image, "r"))==NULL){
             printf("The specified file doesn't exist!");
             }
    else
    {
        if(RegOpenKeyEx(HKEY_CURRENT_USER, "Control Panel\\Desktop", 0, KEY_SET_VALUE, &hKey) != ERROR_SUCCESS){
                                       printf("Couldn't open registry!");
                                       }
        else
        {
        RegSetValueEx(hKey, "Wallpaper", 0, REG_SZ, (const unsigned char*)image, sizeof(image));
        RegCloseKey(hKey);
        }
    }
    fclose(file);
    system("RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters");
    printf("Check your background, it should be changed!");
  
  system("PAUSE");    
  return 0;
}

There, this is the code, uncommented but if someone doesn't understand something feel free to ask. The program has only one bug, it crashes when no argument is given. So the usage goes like this, "nameofbin nameofimage", the image has to be a 24-bit BMP (don't ask why, its windows) u wanted the program compact so no place for conversion algorithms. I hope u can get it to work, if not ask and ill try to fix that. ^_^

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