// PrintBMPPixel.c// c 语言读取BMP格式文件源代码// 可同时处理没有压缩的BMP格式的二值图像， 索引图像， 真彩色图像。#include <stdio.h>#include <Windows.h> // 位图文件头typedef struct tagBMPFILEHEADER{unsigned short bfType; // 2 bytesunsigned long bfSize; // 4 bytesWORD bfReserved1;// 2 bytesWORD bfReserved2;// 2 bytesunsigned long bfOffBits; // 4 bytes}BMPHEADER;BMPHEADER bmpheader;// 位图信息头typedef struct tagBMPINFOHEADER{DWORD biSize;LONG biWidth;LONG biHeight;WORD biPlanes;WORD biBitCount;DWORD biCompression;DWORD biSizeImage;LONG biXPelsPerMeter;LONG biYPelsPerMeter;DWORD biclrUsed;DWORD biClrImportant;}BMPINFOHEADER;BMPINFOHEADER bmpinfoheader;// 调色板(可选）typedef struct tagBMPRGBQUAD{BYTE rgbBlue; // typedef unsigned char BYTE BYTE rgbGreen;BYTE rgbRed;BYTE rgbReserved;}BMPRGBQUAD;BMPRGBQUAD *bmprgbquad;// 位图数据typedef struct tagIMAGEDATA{BYTE red;BYTE green;BYTE blue;}IMAGEDATA;IMAGEDATA *imagedata;// 获得当前BMP文件的大小int GetBmpSize(FILE *fp){long curpos; // attention! this is a long type.int len;curpos = ftell(fp);fseek(fp, 0, SEEK_END);len = ftell(fp);fseek(fp, curpos, SEEK_SET);return len;}int main(int argc, char ** argv){FILE *fp;unsigned char *cp1, *cp2, *sp;int bTrueClr = 1;int i, j;int Width;unsigned char *paletteIndex;//scanf("%s", bmpfile);if (argc <= 1){printf("Please input the filename: \n");system("pause");exit(0);}if ((fp = fopen(argv[1], "rb")) == NULL) // must be "rb" to indicate the position of the file while the pointer is moving!{printf("Can not open file\n");system("pause");exit(0);}fread(&bmpheader, sizeof(unsigned short), 1, fp);sp = (unsigned char *)&bmpheader;sp = sp + 4;fread(sp, sizeof(struct tagBMPFILEHEADER) - 4, 1, fp);fread(&bmpinfoheader, sizeof(struct tagBMPINFOHEADER), 1, fp);if (bmpinfoheader.biBitCount == 1 || bmpinfoheader.biBitCount == 4 || bmpinfoheader.biBitCount == 8){bmprgbquad = (BMPRGBQUAD *)malloc(sizeof(struct tagBMPRGBQUAD)*(1 << bmpinfoheader.biBitCount));fread(bmprgbquad, sizeof(BMPRGBQUAD)*(1 << bmpinfoheader.biBitCount), 1, fp); // 2 的幂，用右移来实现bTrueClr = 0;}if (bmpheader.bfType != 0x424d){printf("The type of the image is not supported\n");}if (bmpinfoheader.biCompression != 0){printf("The compression type are not supported.\n");}if (bmpheader.bfSize != GetBmpSize(fp)){printf("The size of the file is not matched\n");}// print the bmpfileheader value.cp1 = (unsigned char *)&(bmpheader.bfType);cp2 = cp1 + 1;printf("%c", *cp1);printf("%c\n", *cp2);printf("File size: %lu\n", bmpheader.bfSize);printf("Offset from the BOF to the virtual image data: %lu\n", bmpheader.bfOffBits);// print the bmpinfoheader value.printf("The size of the infoheader is: %lu\n", bmpinfoheader.biSize);printf("Width: %ld\n", bmpinfoheader.biWidth);printf("Height: %ld\n", bmpinfoheader.biHeight);printf("Planes: %d\n", bmpinfoheader.biPlanes);printf("Bit Depth: %d\n", bmpinfoheader.biBitCount);printf("Compression type: %lu\n", bmpinfoheader.biCompression);printf("Image data size: %lu\n", bmpinfoheader.biSizeImage);printf("XperMeter: %ld\n", bmpinfoheader.biXPelsPerMeter);printf("YperMeter: %ld\n", bmpinfoheader.biYPelsPerMeter);printf("Color used: %lu\n", bmpinfoheader.biclrUsed);printf("Important color: %lu\n", bmpinfoheader.biClrImportant);// 每一行的字节数必须为4的整数倍Width = (bmpinfoheader.biWidth*bmpinfoheader.biBitCount + 31)/8/4*4;// print the pixel of the imagedataimagedata = (IMAGEDATA *)malloc(sizeof(struct tagIMAGEDATA)*Width*bmpinfoheader.biHeight);paletteIndex = (unsigned char *)malloc(sizeof(unsigned char)*Width*bmpinfoheader.biHeight);if (!bTrueClr){fread(paletteIndex, sizeof(unsigned char)*Width*bmpinfoheader.biHeight, 1, fp);for (i = 0; i < bmpinfoheader.biHeight; i++){for (j = 0; j < Width; j++){(*(imagedata + i * bmpinfoheader.biHeight + j)).blue = bmprgbquad[(BYTE)(*(paletteIndex + i*bmpinfoheader.biHeight + j))].rgbBlue;(*(imagedata + i * bmpinfoheader.biHeight + j)).green = bmprgbquad[(BYTE)(*(paletteIndex + i*bmpinfoheader.biHeight + j))].rgbGreen;(*(imagedata + i * bmpinfoheader.biHeight + j)).red= bmprgbquad[(BYTE)(*(paletteIndex + i*bmpinfoheader.biHeight + j))].rgbRed;}}}else{fread(imagedata, sizeof(struct tagIMAGEDATA)*Width*bmpinfoheader.biHeight, 1, fp);}for (i = 0; i< 1; i++) // Print the first line pixel.{for (j = 0; j < bmpinfoheader.biWidth; j++){if ((*(imagedata + i * bmpinfoheader.biHeight + j)).blue == (*(imagedata + i * bmpinfoheader.biHeight + j)).green && (*(imagedata + i * bmpinfoheader.biHeight + j)).blue == (*(imagedata + i * bmpinfoheader.biHeight + j)).red){printf("%d ", (*(imagedata + i * bmpinfoheader.biHeight + j)).red);}else{printf("%d ", (*(imagedata + i * bmpinfoheader.biHeight + j)).blue);printf("%d ", (*(imagedata + i * bmpinfoheader.biHeight + j)).green);printf("%d ", (*(imagedata + i * bmpinfoheader.biHeight + j)).red);}if (0 == j%3){printf("\n");}}printf("\n");}fclose(fp);system("pause");free(imagedata);free(paletteIndex);return 0;}
