纯C下的读写BMP文件代码 - vfdff的博客

作者在 2008-04-10 01:34:50 发布以下内容

纯C代码下读写BMP文件代码，简单易懂。

/*************************************************************

** 文件名称：read_write_bmp_with_C.c

** 编译: Visual C++ / ANSI C / ISO C++

** 日期： 2007.10.24

**************************************************************/

#include "stdio.h"

#include "stdlib.h"

#define PIXPLINE 320

typedef struct tagRGBQUAD{ //定义每个像素的数据类型

unsigned char rgbBlue;

unsigned char rgbGreen;

unsigned char rgbRed;

} RGBQUAD;

int bmp_read(unsigned char *image, int xsize, int ysize, char *filename) {

char fname_bmp[128];

sprintf(fname_bmp, "%s.bmp", filename);

FILE *fp;

if (!(fp = fopen(fname_bmp, "rb")))

return -1;

unsigned char header[54];

fread(header, sizeof(unsigned char), 54, fp);

fread(image, sizeof(unsigned char), (size_t)(long)xsize * ysize * 3, fp);

fclose(fp);

return 0;

}

int bmp_write(unsigned char *image, int xsize, int ysize, char *filename) {

unsigned char header[54] = {

0x42, 0x4d, 0, 0, 0, 0, 0, 0, 0, 0,

54, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 24, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0

};

long file_size = (long)xsize * (long)ysize * 3 + 54;

header[2] = (unsigned char)(file_size &0x000000ff);

header[3] = (file_size >> 8) & 0x000000ff;

header[4] = (file_size >> 16) & 0x000000ff;

header[5] = (file_size >> 24) & 0x000000ff;

long width = xsize;

header[18] = width & 0x000000ff;

header[19] = (width >> 8) &0x000000ff;

header[20] = (width >> 16) &0x000000ff;

header[21] = (width >> 24) &0x000000ff;

long height = ysize;

header[22] = height &0x000000ff;

header[23] = (height >> 8) &0x000000ff;

header[24] = (height >> 16) &0x000000ff;

header[25] = (height >> 24) &0x000000ff;

char fname_bmp[128];

sprintf(fname_bmp, "%s.bmp", filename);

FILE *fp;

if (!(fp = fopen(fname_bmp, "wb")))

return -1;

fwrite(header, sizeof(unsigned char), 54, fp);

fwrite(image, sizeof(unsigned char), (size_t)(long)xsize * ysize * 3, fp);

fclose(fp);

return 0;

}

void clonebmp(unsigned char *image,int xsize,int ysize)

{

bmp_read(image, xsize, ysize, "orgbmp"); //orgbmp为当前目录下的bmp文件名

bmp_write(image, xsize, ysize, "clone_bmp");//clone_bmp为克隆的bmp文件名

}

/****************************************************************************

* 名称：youwritetobmp()

* 功能：写入bmp文件

* 入口参数：RGBQUAD *pixarr ---- 要写入的像素数组指针, int xsize ---- 图像宽度, int ysize ---- 图像高度, char *filename --图像名称

* 出口参数：无

* 返回值：-1:错误；0：正确

****************************************************************************/

int youwritetobmp(RGBQUAD *pixarr, int xsize, int ysize, char *filename) {

unsigned char header[54] = {

0x42, 0x4d, 0, 0, 0, 0, 0, 0, 0, 0,

54, 0, 0, 0, 40, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 1, 0, 24, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0

};

int i;

int j;

long file_size = (long)xsize * (long)ysize * 3 + 54;

header[2] = (unsigned char)(file_size &0x000000ff);

header[3] = (file_size >> 8) & 0x000000ff;

header[4] = (file_size >> 16) & 0x000000ff;

header[5] = (file_size >> 24) & 0x000000ff;

long width;

if(!(xsize%4)) width=xsize;

else width= xsize+(4-xsize%4); //如不是4的倍数，则转换成4的倍数

header[18] = width & 0x000000ff;

header[19] = (width >> 8) &0x000000ff;

header[20] = (width >> 16) &0x000000ff;

header[21] = (width >> 24) &0x000000ff;

long height = ysize;

header[22] = height &0x000000ff;

header[23] = (height >> 8) &0x000000ff;

header[24] = (height >> 16) &0x000000ff;

header[25] = (height >> 24) &0x000000ff;

char fname_bmp[128];

sprintf(fname_bmp, "%s.bmp", filename);

FILE *fp;

if (!(fp = fopen(fname_bmp, "wb")))

return -1;

fwrite(header, sizeof(unsigned char), 54, fp);

RGBQUAD zero={0,0,0}; //不足字节，用zero填充

for(j=0;j<ysize;j++){

if(!(xsize%4)){

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