[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 shortWORD;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; int ImageX, ImageY; BYTE ByteBuf; int fix; int i, j, n; FILE *fp; FILE *out; char filename;/* 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.rgbtBlue = rgb.rgbtBlue; color.rgbtGreen = rgb.rgbtGreen; color.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.rgbtBlue; rgb.rgbtGreen = color.rgbtGreen; rgb.rgbtRed = color.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");}
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