/* File name:   bmpTest.c    Author:      WanChuan XianSheng    Date:        Oct 01, 2011    Description: Show all Info a bmp file has. including    FileHeader Info, InfoHeader Info and Data Part.    Reference: BMP图像数据的C语言读取源码 */ #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); /* Show bmp file tagBITMAPFILEHEADER info */ void bmpFileHeader(FILE* fpbmp); /* Show bmp file tagBITMAPINFOHEADER info */ void bmpInfoHeader(FILE* fpbmp); /* Show the Data Part of bmp file */ void bmpDataPart(FILE* fpbmp); unsigned int OffSet = 0;    // OffSet from Header part to Data Part long BmpWidth = 0;          // The Width of the Data Part long BmpHeight = 0;         // The Height of the Data Part int main(int argc, char* argv[]) {      /* Open bmp file */      FILE *fpbmp = fopen("lena.bmp", "r+");      if (fpbmp == NULL)      {       fprintf(stderr, "Open lena.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      //bmpFileHeader(fpbmp);            //Show the FileHeader Information      //bmpInfoHeader(fpbmp);            //Show the InfoHeader Information      bmpDataPart(fpbmp);                //Reserve the data to file      fclose(fpbmp);      return 0; } /* Test the file is bmp file or not */ void bmpFileTest(FILE* fpbmp) {          unsigned short bfType = 0;      fseek(fpbmp, 0L, SEEK_SET);      fread(&bfType, sizeof(char), 2, fpbmp);      if (BM != bfType)      {       fprintf(stderr, "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(&BmpWidth, sizeof(char), 4, fpbmp);      fread(&BmpHeight, sizeof(char), 4, fpbmp);      //printf("The Width of the bmp file is %ld.\n", BmpWidth);      //printf("The Height of the bmp file is %ld.\n", BmpHeight); } /* Show bmp file tagBITMAPFILEHEADER info */ void bmpFileHeader(FILE* fpbmp) {      unsigned short bfType;              //UNIT        bfType;      unsigned int   bfSize;              //DWORD       bfSize;      unsigned short bfReserved1;         //UINT        bfReserved1;      unsigned short bfReserved2;         //UINT        bfReserved2;      unsigned int   bfOffBits;           //DWORD       bfOffBits;      fseek(fpbmp, 0L, SEEK_SET);      fread(&bfType,      sizeof(char), 2, fpbmp);      fread(&bfSize,      sizeof(char), 4, fpbmp);      fread(&bfReserved1, sizeof(char), 2, fpbmp);      fread(&bfReserved2, sizeof(char), 2, fpbmp);      fread(&bfOffBits,   sizeof(char), 4, fpbmp);      printf("************************************************\n");      printf("*************tagBITMAPFILEHEADER info***********\n");      printf("************************************************\n");      printf("bfType              is %d.\n", bfType);      printf("bfSize              is %d.\n", bfSize);      printf("bfReserved1         is %d.\n", bfReserved1);      printf("bfReserved2         is %d.\n", bfReserved2);      printf("bfOffBits           is %d.\n", bfOffBits); } /* Show bmp file tagBITMAPINFOHEADER info */ void bmpInfoHeader(FILE* fpbmp) {      unsigned int biSize;              // DWORD        biSize;      long         biWidth;                // LONG         biWidth;      long         biHeight;               // LONG         biHeight;      unsigned int biPlanes;               // WORD         biPlanes;      unsigned int biBitCount;             // WORD         biBitCount;      unsigned int biCompression;          // DWORD        biCompression;      unsigned int biSizeImage;            // DWORD        biSizeImage;      long         biXPelsPerMerer;        // LONG         biXPelsPerMerer;      long           biYPelsPerMerer;        // LONG         biYPelsPerMerer;      unsigned int biClrUsed;              // DWORD        biClrUsed;      unsigned int biClrImportant;         // DWORD        biClrImportant;      fseek(fpbmp, 14L, SEEK_SET);      fread(&biSize,          sizeof(char), 4, fpbmp);      fread(&biWidth,         sizeof(char), 4, fpbmp);      fread(&biHeight,        sizeof(char), 4, fpbmp);      fread(&biPlanes,        sizeof(char), 4, fpbmp);      fread(&biBitCount,      sizeof(char), 4, fpbmp);      fread(&biCompression,   sizeof(char), 4, fpbmp);      fread(&biSizeImage,     sizeof(char), 4, fpbmp);      fread(&biXPelsPerMerer, sizeof(char), 4, fpbmp);      fread(&biYPelsPerMerer, sizeof(char), 4, fpbmp);      fread(&biClrUsed,       sizeof(char), 4, fpbmp);      fread(&biClrImportant,  sizeof(char), 4, fpbmp);      printf("************************************************\n");      printf("*************tagBITMAPINFOHEADER info***********\n");      printf("************************************************\n");      printf("biSize              is %d. \n", biSize);      printf("biWidth             is %ld.\n", biWidth);      printf("biHeight            is %ld.\n", biHeight);      printf("biPlanes            is %d. \n", biPlanes);      printf("biBitCount          is %d. \n", biBitCount);      printf("biCompression       is %d. \n", biCompression);      printf("biSizeImage         is %d. \n", biSizeImage);      printf("biXPelsPerMerer     is %ld.\n", biXPelsPerMerer);      printf("biYPelsPerMerer     is %ld.\n", biYPelsPerMerer);      printf("biClrUsed           is %d. \n", biClrUsed);      printf("biClrImportant      is %d. \n", biClrImportant); } /* Show the Data Part of bmp file */ void bmpDataPart(FILE* fpbmp) {      int i, j;      unsigned char bmpPixel[BmpWidth][BmpHeight];      unsigned char* bmpPixelTmp = NULL;      FILE* fpDataBmp;      /* New a file to save the data matrix */      if((fpDataBmp=fopen("bmpData.dat","w+")) == NULL)      {       fprintf(stderr, "Failed to construct file bmpData.dat.!!!");       exit(1);      }      fseek(fpbmp, OffSet, SEEK_SET);      if ((bmpPixelTmp=(unsigned char*)malloc(sizeof(char)*BmpWidth*BmpHeight))==NULL)      {       fprintf(stderr, "Data allocation failed.!!!\n");       exit(1);      }      fread(bmpPixelTmp, sizeof(char), BmpWidth*BmpHeight, fpbmp);      /* Read the data to Matrix and save it in file bmpData.dat */      for(i =0; i < BmpHeight; i++)      {       fprintf(fpDataBmp, "The data in line %-3d:\n", i+1);       for(j = 0; j < BmpWidth; j++)       {            bmpPixel[i][j] = bmpPixelTmp[BmpWidth*(BmpHeight-1-i)+j];            //fwrite(&chartmp, sizeof(char), 1, fpDataBmp);            fprintf(fpDataBmp, "%-3d ", bmpPixel[i][j]);            if ((j+1)%32 == 0)            {             fprintf(fpDataBmp, "\n");            }       }      }      /* Used to test the data read is true or false     You can open the file using Matlab to compare the data */      //printf("bmpPixel[2][3]   is %d.\n", bmpPixel[2][3]);      //printf("bmpPixel[20][30] is %d.\n", bmpPixel[20][30]);      free(bmpPixelTmp);      fclose(fpDataBmp); }