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Read/write map file
Author
I wan''t to create a map editor to my game, which works with tiles.
What is the best way to read/write the map data to/from a mapfile?
It would really helpfull if you could give me some small bits of code =)
If your tiles are objects, first write out the number of tiles, followed by all the data, then write the dims of the map, followed by all the data:
itn handle = open("nifty.map", O_CREAT / O_TRUNC / O_BINARY / O_RDWR, S_IWRITE / S_IREAD);
int temp = GetNumberOfTiles();
write(handle, &temp, sizeof(temp));
for (int q=0; q < temp; q++) {
WriteTile(handle); // save a tile struct to handle
}
int sizex = GetMapXDim(); write(handle, &sizex, sizeof(sizex));
int sizey = GetMapYDim(); write(handle, &sizey, sizeof(sizey));
for (int x=0; x < sizex; x++)
for (int y=0; y < sizey; y++)
WriteMapSpot(x,y,handle); // write out map coord (x,y)
close(handle);
Something like that. There are all sorts of things you could do to make the above code better, but that''s the general idea.
Mason McCuskey
Spin Studios - home of Quaternion, 2000 GDC Indie Games Fest Finalist!
www.spin-studios.com
itn handle = open("nifty.map", O_CREAT / O_TRUNC / O_BINARY / O_RDWR, S_IWRITE / S_IREAD);
int temp = GetNumberOfTiles();
write(handle, &temp, sizeof(temp));
for (int q=0; q < temp; q++) {
WriteTile(handle); // save a tile struct to handle
}
int sizex = GetMapXDim(); write(handle, &sizex, sizeof(sizex));
int sizey = GetMapYDim(); write(handle, &sizey, sizeof(sizey));
for (int x=0; x < sizex; x++)
for (int y=0; y < sizey; y++)
WriteMapSpot(x,y,handle); // write out map coord (x,y)
close(handle);
Something like that. There are all sorts of things you could do to make the above code better, but that''s the general idea.
Mason McCuskey
Spin Studios - home of Quaternion, 2000 GDC Indie Games Fest Finalist!
www.spin-studios.com
I think:
io.h
fcntl.h
sys\stat.h
Mason McCuskey
Spin Studios - home of Quaternion, 2000 GDC Indie Games Fest Finalist!
www.spin-studios.com
io.h
fcntl.h
sys\stat.h
Mason McCuskey
Spin Studios - home of Quaternion, 2000 GDC Indie Games Fest Finalist!
www.spin-studios.com
Author
Thanks, the code works great!
I''ve just got a little question:
How do I read data from files? Using read(...)?
How does read work?
I''ve just got a little question:
How do I read data from files? Using read(...)?
How does read work?
Author
Ok, read seams to be working...but...
I use this to write the dimensions of the map in the beginning of the file:
int sizex = 100;
write(handle, &sizex, sizeof(sizex));
int sizey = 100;
write(handle, &sizey, sizeof(sizey));
and I use this to read the dimensions:
int sizex = read(handle, &sizex, sizeof(sizex));
int sizey = read(handle, &sizey, sizeof(sizey));
but it only reads a 4x4 map instead of, in mycase, a 100x100 map. What do you think is wrong?
I use this to write the dimensions of the map in the beginning of the file:
int sizex = 100;
write(handle, &sizex, sizeof(sizex));
int sizey = 100;
write(handle, &sizey, sizeof(sizey));
and I use this to read the dimensions:
int sizex = read(handle, &sizex, sizeof(sizex));
int sizey = read(handle, &sizey, sizeof(sizey));
but it only reads a 4x4 map instead of, in mycase, a 100x100 map. What do you think is wrong?
Hmm I dont have any experince with the windows save and read file functions. So I recommend looking at fwrite and fread. They might be from dos and are old ,but they work for me. 
As far as tile map data goes I normaly just have a array of tile structs. Something like this.
typedef struct map{
char type; //what type of tile is it grass, water, ect
int flag; //any flags walkable,teleport,whatever
}map;
map tilemap[sizeofworldx][sizeofworldy];
Then i can just write to file the size of the world and with one call write tilemap to file. And reading it back is done but with 3 calls to. Of course this is only if you want fixed sized maps. Dynamic sized maps you need to save differntly.
As far as tile map data goes I normaly just have a array of tile structs. Something like this.
typedef struct map{
char type; //what type of tile is it grass, water, ect
int flag; //any flags walkable,teleport,whatever
}map;
map tilemap[sizeofworldx][sizeofworldy];
Then i can just write to file the size of the world and with one call write tilemap to file. And reading it back is done but with 3 calls to. Of course this is only if you want fixed sized maps. Dynamic sized maps you need to save differntly.
>int sizex = read(handle, &sizex, sizeof(sizex));
>int sizey = read(handle, &sizey, sizeof(sizey));
don''t set sizex and sizey to be the return value of read. read probably returns the number of bytes read, not what was in those bytes.
>int sizey = read(handle, &sizey, sizeof(sizey));
don''t set sizex and sizey to be the return value of read. read probably returns the number of bytes read, not what was in those bytes.
This topic is closed to new replies.
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