[C] 讀取和寫出一個24bit的bmp圖片
#include <iostream>#include <fstream>#include <windows.h>typedef unsigned char BYTE;typedef unsigned short WORD;typedef unsigned long DWORD;typedef long LONG;//#define MAXPIX 512using namespace std;struct RGBDATA{ BYTE rgbtRed; BYTE rgbtGreen;BYTE rgbtBlue; };void main(){ BITMAPFILEHEADERFileHeader; BITMAPINFOHEADERInfoHeader; RGBTRIPLE color[345][300]; int ImageX, ImageY; BYTE ByteBuf; int fix; int i, j, n; FILE *fp; FILE *out; char filename[20]; /* 開啟檔案 */ scanf("%s", filename); fp = fopen(filename, "rb"); out = fopen("out.bmp", "wb"); /* 先讀取檔頭資訊 */ fread(&FileHeader, sizeof(BITMAPFILEHEADER), 1, fp); fread(&InfoHeader, sizeof(BITMAPINFOHEADER), 1, fp); fwrite (&FileHeader , 1 , sizeof(BITMAPFILEHEADER) , out ); fwrite (&InfoHeader , 1 , sizeof(BITMAPINFOHEADER) , out ); /* 確定格式 */ if( FileHeader.bfType != 'MB' ) return; if( InfoHeader.biCompression != 0 ) return; if( InfoHeader.biBitCount != 24 ) return; /* 取得圖寬及圖高 */ ImageX = InfoHeader.biWidth; ImageY = InfoHeader.biHeight; printf("ImageX:%d\n",ImageX); printf("ImageY:%d\n",ImageY); /* 計算每列需略過的 bytes 數 */ if( (ImageX*3)%4 != 0) fix = 4 - ((ImageX*3)%4); else fix = 0; /* 圖入各像素資訊 */ RGBDATA rgb; for( i=ImageY-1; i>=0; i-- ) { for( j=0; j<ImageX; j++ ) { fread(&rgb, sizeof(RGBTRIPLE), 1, fp); color[j][i].rgbtBlue = rgb.rgbtBlue; color[j][i].rgbtGreen = rgb.rgbtGreen; color[j][i].rgbtRed = rgb.rgbtRed; } /* 略過各列多餘的資訊 */ for( n=0; n<fix; n++ ){ fread(&ByteBuf, sizeof(BYTE), 1, fp); //fwrite(&ByteBuf , 1 , sizeof(ByteBuf) , out); } } for( i=ImageY-1; i>=0; i-- ) { for( j=ImageX-1; j>= 0 ; j-- ) { rgb.rgbtBlue = color[j][i].rgbtBlue; rgb.rgbtGreen = color[j][i].rgbtGreen; rgb.rgbtRed = color[j][i].rgbtRed; fwrite (&rgb , 1 , sizeof(RGBTRIPLE) , out); } /* 略過各列多餘的資訊 */ for( n=0; n<fix; n++ ){ fwrite(&ByteBuf , 1 , sizeof(ByteBuf) , out); } }fclose(fp);fclose(out);system("pause");}