Exam/bmp1.c

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include<Windows.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 =(unsigned char*) 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 =(unsigned char*) 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 =(unsigned char*) 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);
}