在C中读取.bmp文件 [英] Reading .bmp file in C
问题描述
大家好，
我想将.bmp图像的像素值（将输入到代码中的
）读入矩阵... plz帮助我，因为我无法理解
如何实现这一目标...
提前感谢
biplab
biplab说：
大家好，
我想读取.bmp图像的像素值（将输入到代码中的
）到矩阵中... plz帮助我，因为我无法理解如何
来实现这个目标...
到目前为止你尝试了什么？
-
Richard Heathfield< http://www.cpax.org.uk>
电子邮件：-http：// www。 + rjh @
谷歌用户：< http://www.cpax.org.uk/prg/writings/googly.php>
Usenet是一个奇怪的放置" - dmr 1999年7月29日
9月10日，6：12 * pm，Richard Heathfield< r ... @ see.sig.invalidwrote：
< blockquote class =post_quotes>
biplab说：
大家好，
我想读取一个像素值.bmp图片（将输入到代码中的
）到矩阵中... plz帮助我，因为我无法理解
如何实现这个...
到目前为止你尝试了什么？
-
Richard Heathfield< http ：//www.cpax.org.uk>
电子邮件：-http：// www。 + rjh @
谷歌用户：< http://www.cpax.org.uk/prg/writings/googly.php>
Usenet是一个奇怪的放置" - dmr 1999年7月29日
我用fopen读取文件...然后读取值... bt
没有什么是阅读...我在C中有一个访问视频内存的代码，以便
打印图像....你可以帮我解决一下这个代码我怎么能
读取像素值，并输出与输入相同的图像...
#include< stdio.h>
#include< stdlib.h>
#include< dos.h>
#include< mem.h>
#include< string。 h>
#include< conio.h>
#include< fcntl.h>
#include< io.h>
#include< math.h>
unsigned char r [360]，mini，mode;
unsigned char rgb [256] [3];
char * fullname;
char * fname;
unsigned int screen_width = 320;
unsigned int first_row = 0，first_column = 0，last_row = 0，last_column = 0;
int handle，i，j，rem，color_bits;
long int
file_size，data_offset，size_info_header，width，heigh t，compression，
image_size，xpelspermeter，ypelspermeter，colorsused，colorsimpt;
float theta ;
void drawdot（int y，int x，int pal_index）{
_AX = pal_index;
_CX = x;
_DX = y;
_AH = 0x0c;
_BH = 0x00;
geninterrupt（0x10）;
}
void main（）{
得到（fname）;
strcpy（fullname， fname）;
strcat（fullname，" .bmp"）;
handle = _open（fullname，O_RDONLY）;
if（handle == - 1）退出（EXIT_FAILURE）;
_read（句柄，r，2）;
if（r [0]！=''B''| r [1]！=''M''）退出（EXIT_FAILURE）;
_read（句柄，r，
4）; file_size = r [0] + 0x100 * r [1] + 0x10000 * r [2] + 0x1000000 * r [3];
_read（句柄，r，2）;
_read（句柄，r ，2）;
_read（句柄，r，4）;
data_offset = r [0] + 256 * r [1] + 65536 * r [2] + 0x1000000 * r [3];
_read（句柄，r，4）;
size_info_header = r [0] + 256 * r [1] + 65536 * r [ 2] + 0x1000000 * r [3];
如果（size_info_header！= 40）退出（EXIT_FAILURE）;
_read（handle，r，4）;
width = r [0] + 0x100 * r [1] + 0x10000 * r [2] + 0x1000000 * r [3];
if（width screen_width）exit（0） ;
_read（句柄，r，4）;
height = r [0] + 0x100 * r [1] + 0x10000 * r [2] + 0x1000000 * r [3];
_read（句柄，r，2）;
如果（r [0]！= 1）退出（EXIT_FAILURE）;
_read（handle，r，2）;
color_bits = r [0];
_read（handle，r，4）;
compression = r [0] + 0x100 * r [1] + 0x10000 * r [2] + 0x1000000 * r [3];
_read（handle，r，4）;
image_size = r [0] + 256 * r [1] + 256 * 256 * r [2] + 256 * 256 * 256 * r [3];
_read（句柄，r，4）;
xpelspermeter = r [0] + 0x100 * r [1] + 0x10000 * r [2 ] + 0x1000000 * r [3];
_read（句柄，r，4）;
ypelspermeter = r [0] + 0x100 * r [1] + 0x10000 * r [2] + 0x1000000 * r [3];
_read（句柄，r，4）;
colorsused = r [0] + 0x100 * r [1] + 0x10000 * r [2] + 0x1000000 * r [3];
_read（句柄，r，4）;
colorsimpt = r [0] + 0x100 * r [1] + 0x10000 * r [2] + 0x1000000 * r [3];
_AX = 0x1201; _BL = 0x33; geninterrupt（0x10）; //不添加RGB
_AX = 0x0013; geninterrupt（0x10）; //设置模式13即320x200x256
for（i = 0; i< 256; i ++）{
_read（handle，r，4）;
rgb [i] [0] = r [2]; rgb [i] [1] = r [1]; rgb [i ] [2] = r [0];
}
_ES = FP_SEG（rgb）; _ DX = FP_OFF（rgb）;
_BX = 0; _CX = 0x100; _AX = 0x1012;
geninterrupt（0x10）; //从rgb设置DAC
first_column =（screen_width-width）/ 2;
last_row = first_row + height-1;
last_column = first_column + width-1;
rem = 4 - （width％4）;
for（i = 0; i< = height-1; i ++）{
_read（handle，r，width）;
for（j = 0; j< = width-1; j ++）drawdot（first_column + j，last_row-i，r [j]）;
if（rem == 1）_read（handle，r，1）;
else if（rem == 2）_read（handle，r，2）;
else if（rem == 3）_read（handle，r，3）; / / getch（）;
}
_close（句柄）;
getch（）;
_AX = 0x1201 ; _BL = 0x33; geninterrupt（0x10）; //不添加RGB
_AX = 0x0003; geninterrupt（0x10）; //设置模式3即16色文本
}
如果你让我知道代码
正在做什么以及怎么做的话，我将非常感激。 /因为我在互联网上找到了代码并且在C中是一个新的朋友...
提前感谢...
bipla b
biplab写道：
9月10日下午6:12，Richard Heathfield< r。 .. @ see.sig.invalidwrote：
> biplab说：
我已经使用fopen读取了文件...然后读取了值... bt
没有读取...我在C中有一个访问vedio内存的代码
打印图像....你可以帮我解决一下这段代码我怎么能用b $ b读取像素值并输出与输出相同的图像.. 。
unsigned char r [360]，mini，mode;
< snip bad code>
}
首先，如果你让我知道代码是什么代码
正在做什么以及如何？/我已经在互联网上找到代码并且我是一个
新手在C ...
提前感谢...
biplab
似乎读取一个bmp文件，非常糟糕（并假设它是8位颜色
索引），然后以高度机器特定的方式显示它，这可能会赢得'b
'在现代机器上工作。
我建议你在互联网上找到一些更新的代码。并从显示屏中分离bmp加载单独的
。您可以尝试google onbmp file
format。
-
Bartc
Hi all,
I want to read the pixel values of a .bmp image(which will be input to
the code) into a matrix...plz help me out as i can not understand how
to achieve this...
thanks in advance
biplab
biplab said:
Hi all,
I want to read the pixel values of a .bmp image(which will be input to
the code) into a matrix...plz help me out as i can not understand how
to achieve this...What have you tried so far?
--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999
On Sep 10, 6:12*pm, Richard Heathfield <r...@see.sig.invalidwrote:biplab said:
Hi all,
I want to read the pixel values of a .bmp image(which will be input to
the code) into a matrix...plz help me out as i can not understand how
to achieve this...
What have you tried so far?
--
Richard Heathfield <http://www.cpax.org.uk>
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999I have read the file using fopen...and then read the value...bt
nothing is read...I have a code in C which access the vedio memory to
print an image....can you please help me out from that code how can i
read the pixel vales and have the same image as output as the input...
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
#include <mem.h>
#include <string.h>
#include <conio.h>
#include <fcntl.h>
#include <io.h>
#include <math.h>
unsigned char r[360],mini,mode;
unsigned char rgb[256][3];
char *fullname;
char *fname;
unsigned int screen_width=320;
unsigned int first_row=0,first_column=0,last_row=0,last_column= 0;
int handle,i,j,rem,color_bits;
long int
file_size,data_offset,size_info_header,width,heigh t,compression,
image_size,xpelspermeter,ypelspermeter,colorsused, colorsimpt;
float theta;
void drawdot(int y, int x, int pal_index){
_AX=pal_index;
_CX=x;
_DX=y;
_AH=0x0c;
_BH=0x00;
geninterrupt(0x10);
}
void main(){
gets(fname);
strcpy(fullname,fname);
strcat(fullname,".bmp");
handle=_open(fullname,O_RDONLY);
if (handle==-1) exit(EXIT_FAILURE);
_read(handle,r,2);
if (r[0] !=''B'' | r[1] !=''M'') exit(EXIT_FAILURE);
_read(handle,r,
4);file_size=r[0]+0x100*r[1]+0x10000*r[2]+0x1000000*r[3];
_read(handle,r,2);
_read(handle,r,2);
_read(handle,r,4);
data_offset=r[0]+256*r[1]+65536*r[2]+0x1000000*r[3];
_read(handle,r,4);
size_info_header=r[0]+256*r[1]+65536*r[2]+0x1000000*r[3];
if (size_info_header !=40) exit(EXIT_FAILURE);
_read(handle,r,4);
width=r[0]+0x100*r[1]+0x10000*r[2]+0x1000000*r[3];
if (width screen_width) exit(0);
_read(handle,r,4);
height=r[0]+0x100*r[1]+0x10000*r[2]+0x1000000*r[3];
_read(handle,r,2);
if (r[0] != 1) exit(EXIT_FAILURE);
_read(handle,r,2);
color_bits=r[0];
_read(handle,r,4);
compression=r[0]+0x100*r[1]+0x10000*r[2]+0x1000000*r[3];
_read(handle,r,4);
image_size=r[0]+256*r[1]+256*256*r[2]+256*256*256*r[3];
_read(handle,r,4);
xpelspermeter=r[0]+0x100*r[1]+0x10000*r[2]+0x1000000*r[3];
_read(handle,r,4);
ypelspermeter=r[0]+0x100*r[1]+0x10000*r[2]+0x1000000*r[3];
_read(handle,r,4);
colorsused=r[0]+0x100*r[1]+0x10000*r[2]+0x1000000*r[3];
_read(handle,r,4);
colorsimpt=r[0]+0x100*r[1]+0x10000*r[2]+0x1000000*r[3];
_AX=0x1201;_BL=0x33;geninterrupt(0x10);//don''t add RGB
_AX=0x0013;geninterrupt(0x10);//set mode 13 i.e. 320x200x256
for (i=0;i<256;i++) {
_read(handle,r,4);
rgb[i][0]=r[2];rgb[i][1]=r[1];rgb[i][2]=r[0];
}
_ES=FP_SEG(rgb);_DX=FP_OFF(rgb);
_BX=0;_CX=0x100; _AX=0x1012;
geninterrupt(0x10);//set DAC from rgb
first_column=(screen_width-width)/2;
last_row=first_row+height-1;
last_column=first_column+width-1;
rem=4 - (width % 4);
for (i=0;i<=height-1;i++) {
_read(handle,r,width);
for (j=0;j<=width-1;j++) drawdot(first_column+j,last_row-i,r[j]);
if (rem==1) _read(handle,r,1);
else if (rem==2) _read(handle,r,2);
else if (rem==3) _read(handle,r,3);//getch();
}
_close(handle);
getch();
_AX=0x1201;_BL=0x33;geninterrupt(0x10);//don''t add RGB
_AX=0x0003;geninterrupt(0x10);//set mode 3 i.e. 16-color text
}
1st of all i will be highly obliged if you let me know what the code
is doing and how??/As i have found the code in the internet and am a
newbie in C...
thanks in advance...
biplab
biplab wrote:On Sep 10, 6:12 pm, Richard Heathfield <r...@see.sig.invalidwrote:>biplab said:
I have read the file using fopen...and then read the value...bt
nothing is read...I have a code in C which access the vedio memory to
print an image....can you please help me out from that code how can i
read the pixel vales and have the same image as output as the input...
unsigned char r[360],mini,mode;<snip bad code>
}
1st of all i will be highly obliged if you let me know what the code
is doing and how??/As i have found the code in the internet and am a
newbie in C...
thanks in advance...
biplabIt seems to read a bmp file, very badly (and assumes it is 8-bit colour
indexed), then displays it in a highly machine-specific manner, which
probably won''t work on a modern machine.
I suggest you find some more up-to-date code on the internet. And separate
out the bmp loading from the display. You might try google on "bmp file
format".
--
Bartc
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