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参考地址:http://blog.csdn.net/wsfdl/article/details/7957370
#include <stdio.h>
#include <stdlib.h>
#define BITMAPFILEHEADERLENGTH 14 // The bmp FileHeader length is 14
#define BM 19778 // The ASCII code for BM
/* Test the file is bmp file or not */
void bmpFileTest(FILE* fpbmp);
/* To get the OffSet of header to data part */
void bmpHeaderPartLength(FILE* fpbmp);
/* To get the width and height of the bmp file */
void BmpWidthHeight(FILE* fpbmp);
//get r,g,b data
void bmpDataPart(FILE* fpbmp);
// output data to corresponding txt file
void bmpoutput(FILE *fpout);
unsigned int OffSet = 0; // OffSet from Header part to Data Part
long width ; // The Width of the Data Part
long height ; // The Height of the Data Part
unsigned char r[2000][2000],output_r[2000][2000];
unsigned char g[2000][2000],output_g[2000][2000];
unsigned char b[2000][2000],output_b[2000][2000];
int main(int argc, char* argv[])
{
/* Open bmp file */
unsigned char *fp_temp;
FILE *fpbmp;
FILE *fpout;
fpbmp= fopen("1.bmp", "rb");
if (fpbmp == NULL)
{
printf("Open bmp failed!!!\n");
return 1;
}
fpout= fopen("out.bmp", "wb+");
if (fpout == NULL)
{
printf("Open out.bmp failed!!!\n");
return 1;
}
bmpFileTest(fpbmp); //Test the file is bmp file or not
bmpHeaderPartLength(fpbmp); //Get the length of Header Part
BmpWidthHeight(fpbmp); //Get the width and width of the Data Part
//
fseek(fpbmp, 0L, SEEK_SET);
fseek(fpout, 0L, SEEK_SET);
fp_temp=malloc(OffSet);
fread(fp_temp, 1, OffSet, fpbmp);
fwrite(fp_temp,1,OffSet,fpout);
bmpDataPart(fpbmp); //Reserve the data to file
/*
如果您想对图片进行处理,请您再这里插入处理函数!!!!!!!!!!!!!!!!!!
*/
bmpoutput(fpout);
fclose(fpbmp);
fclose(fpout);
return 0;
}
void bmpoutput(FILE* fpout)
{
int i, j=0;
int stride;
unsigned char* pixout=NULL;
stride=(24*width+31)/8;
stride=stride/4*4;
pixout=malloc(stride);
fseek(fpout, OffSet, SEEK_SET);
for(j=0;j<height;j++)
{
for(i=0;i<width;i++)
{
pixout[i*3+2]=output_r[height-1-j][i];
pixout[i*3+1]=output_g[height-1-j][i];
pixout[i*3] =output_b[height-1-j][i];
}
fwrite(pixout, 1, stride, fpout);
}
}
void bmpDataPart(FILE* fpbmp)
{
int i, j=0;
int stride;
unsigned char* pix=NULL;
FILE* fpr;
FILE* fpg;
FILE* fpb;
if((fpr=fopen("bmpr.txt","w+")) == NULL)
{
printf("Failed to construct file bmpr.txt.!!!");
exit(1);
}
if((fpg=fopen("bmpg.txt","w+")) == NULL)
{
printf("Failed to construct file bmpg.txt.!!!");
exit(1);
}
if((fpb=fopen("bmpb.txt","w+")) == NULL)
{
printf("Failed to construct file bmpb.txt.!!!");
exit(1);
}
fseek(fpbmp, OffSet, SEEK_SET);
stride=(24*width+31)/8;
stride=stride/4*4;
pix=malloc(stride);
for(j=0;j<height;j++)
{
fread(pix, 1, stride, fpbmp);
for(i=0;i<width;i++)
{
r[height-1-j][i] =pix[i*3+2];
g[height-1-j][i] =pix[i*3+1];
b[height-1-j][i] =pix[i*3];
output_r[height-1-j][i] =pix[i*3+2];
output_g[height-1-j][i] =pix[i*3+1];
output_b[height-1-j][i] =pix[i*3];
}
}
for(i =0; i < height; i++)
{
for(j = 0; j < width-1; j++)
{
fprintf(fpb,"%4d",b[i][j]);
fprintf(fpg,"%4d",g[i][j]);
fprintf(fpr,"%4d",r[i][j]);
}
fprintf(fpb,"%4d\n",b[i][j]);
fprintf(fpg,"%4d\n",g[i][j]);
fprintf(fpr,"%4d\n",r[i][j]);
}
fclose(fpr);
fclose(fpg);
fclose(fpb);
}
void bmpFileTest(FILE* fpbmp)
{
unsigned short bfType = 0;
fseek(fpbmp, 0L, SEEK_SET);//seek_set 起始位置
fread(&bfType, sizeof(char), 2, fpbmp);
if (BM != bfType)
{
printf("This file is not bmp file.!!!\n");
exit(1);
}
}
/* To get the OffSet of header to data part */
void bmpHeaderPartLength(FILE* fpbmp)
{
fseek(fpbmp, 10L, SEEK_SET);
fread(&OffSet, sizeof(char), 4, fpbmp);
printf("The Header Part is of length %d.\n", OffSet);
}
/* To get the width and height of the bmp file */
void BmpWidthHeight(FILE* fpbmp)
{
fseek(fpbmp, 18L, SEEK_SET);
fread(&width, sizeof(char), 4, fpbmp);
fseek(fpbmp, 22L, SEEK_SET);
fread(&height, sizeof(char), 4, fpbmp);
printf("The Width of the bmp file is %ld.\n", width);
printf("The Height of the bmp file is %ld.\n", height);
}
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