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access violation (segmentation fault)*unsolved*
September 02, 2004 02:03 PM
it says the afformentioned error was found in my program in this line and i dont exacly know what it means
array[3]=(BITMAP *)datafile[river_ver].dat,datafile [mountain].dat,datafile[plains].dat;
[Edited by - raptorstrike on September 2, 2004 9:51:36 PM]
____________________________"This just in, 9 out of 10 americans agree that 1 out of 10 americans will disagree with the other 9"- Colin Mochrie
133
September 02, 2004 03:07 PM
In general, a segmentation fault (or/and a segmentation fault) arises when some part of memory is accessed which has not been allocated previously.
Without more information on the context (which compiler are you using, which operating system, which development api etc...) it's hard to find the precise answer to your question, but if I should guess, I'd think it's one of the following:
- "array" has not been sized correctly, so maybe you allocated array = new whatevertype[3]; instead of new whatevertype[4];
- same is true for datafile: size too small?
Actually, I don't quite understand the line... Which language is this?!
or should it read:
array[3] = {(BITMAP *) datafile[river_ver].dat, datafile[mountain].dat, datafile[plains].dat}; ??
But even that wouldn't make any sense...
Sorry for the somewhat unhelpful try of assistance; maybe you can provide some more context and I (or someone better suited) can help you further...
Without more information on the context (which compiler are you using, which operating system, which development api etc...) it's hard to find the precise answer to your question, but if I should guess, I'd think it's one of the following:
- "array" has not been sized correctly, so maybe you allocated array = new whatevertype[3]; instead of new whatevertype[4];
- same is true for datafile: size too small?
Actually, I don't quite understand the line... Which language is this?!
or should it read:
array[3] = {(BITMAP *) datafile[river_ver].dat, datafile[mountain].dat, datafile[plains].dat}; ??
But even that wouldn't make any sense...
Sorry for the somewhat unhelpful try of assistance; maybe you can provide some more context and I (or someone better suited) can help you further...
September 02, 2004 04:33 PM
i dose look kind of wierd cause im using allegro this is c++ but it is a genral debug error (not alleg. stacific so i posted it here
im just declaring an array of BITMAPS via a seprate data file datafile.dat and i am specifying what spacific map [river_ver] in a large set of bitmaps
EDIT: by the way my compiler (dev-cpp 4.9.9.0) dosnt like those {} around the array so thats why there not there
#include "main.h"#include "allegro.h"#include "tile.h"int main(int argc, char *argv[]){ tile the_tile; DATAFILE *datafile; BITMAP * array[3]; (BITMAP *) datafile[river_ver].dat; int identifire; int array2[2][3]; int x; int y; array2[2][3]= 1,2,0,2,1,0; (BITMAP *) datafile[mountain].dat; (BITMAP *) datafile[plains].dat; array[3]= (BITMAP *) datafile[river_ver].dat,datafile[mountain].dat,datafile[plains].dat; char buf[256]; allegro_init(); install_keyboard(); if (set_gfx_mode(GFX_AUTODETECT_WINDOWED , 320, 200, 0, 0) != 0) { set_gfx_mode(GFX_TEXT , 0, 0, 0, 0); allegro_message("Unable to set any graphic mode\n%s\n", allegro_error); return 1; set_color_depth(32); } /* load the datafile into memory */ replace_filename(buf, argv[0], "datafile.dat", sizeof(buf)); datafile = load_datafile(buf); if (!datafile) { set_gfx_mode(GFX_TEXT, 0, 0, 0, 0); allegro_message("Error loading %s!\n", buf); return 1; } int templat[2][3]={1,0,1,2,2,0}; set_palette((RGB *)datafile[main_palette].dat); /* aha, set a palette and let Allegro convert colors when blitting */ set_color_conversion(COLORCONV_TOTAL); /* display the bitmap from the datafile */ textout(screen, font, "This is the bitmap:", 32, 16, makecol(255, 0, 255)); the_tile.draw_tile(x,y,identifire,array,array2); /* and use the font from the datafile */ // textout(screen, datafile[BIG_FONT].dat, "And this is a big font!", 32, 128,// makecol(0, 255, 0)); readkey(); /* unload the datafile when we are finished with it */ unload_datafile(datafile); return 0;}END_OF_MAIN();im just declaring an array of BITMAPS via a seprate data file datafile.dat and i am specifying what spacific map [river_ver] in a large set of bitmaps
EDIT: by the way my compiler (dev-cpp 4.9.9.0) dosnt like those {} around the array so thats why there not there
____________________________"This just in, 9 out of 10 americans agree that 1 out of 10 americans will disagree with the other 9"- Colin Mochrie
133
September 03, 2004 05:15 AM
Okay, I think the problem is with your array declaration:
BITMAP *array[3];
declares an array of pointers... Valid from
array[0]
to
array[2]
so, if you'd like to access the third entry, write
array[2] = ...
or increase the size.
Hth!
[Edited by - Beren77 on September 3, 2004 7:15:30 AM]
BITMAP *array[3];
declares an array of pointers... Valid from
array[0]
to
array[2]
so, if you'd like to access the third entry, write
array[2] = ...
or increase the size.
Hth!
[Edited by - Beren77 on September 3, 2004 7:15:30 AM]
September 03, 2004 09:09 AM
well i fixed my function (that did go of the base of 1-3) so i did prevent a future error but this error persists its in this line
array[0]=(BITMAP *) datafile[river_ver].dat;
array[0]=(BITMAP *) datafile[river_ver].dat;
____________________________"This just in, 9 out of 10 americans agree that 1 out of 10 americans will disagree with the other 9"- Colin Mochrie
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