I can't plot raster map:(

[liu ji kai]

here is part of my program: ---------------------------------------------- 

char *name="eco"; 

struct Colors colors; 

CELL *raster; 

int row,fd,top,bottom,left,right; 

/*perform plotting setup*/ 

D_setup(0); 

/*region has been already asigned*/ 

D_get_screen_window(&top,&bottom,&left,&right); 

D_cell_draw_setup(&top,&bottom,&left,&right); 

raster=G_malloc_cell_buf(); 

/*open raster map,read and set the colors*/ 

fd=G_open_cell_old(name,G_mapset()); 

G_read_colors(name,G_mapset(),&colors); 

D_set_colors(&colors); 

/*plot*/ D_set_overlay_mode(1); 

for(row=0;row>=0;) 

{ G_get_map_row(fd,raster,row); 

row=D_draw_cell(row,raster,&colors); 

} 

G_close_cell(fd); 

G_free_colors(&colors); 

} 

------------------------------------------------- 

In fact,in the for circle,when execute line "row= 

......",row can't get the right value but -1,what is 

wrong?send me e_mail. 
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