#include <iostream.h>
#include <fstream.h>
#include <stdlib.h>

void main()
{
	int i,j;
	char header[1078]; //256色bitmap header
    int image_row;
    int image_col;
 
    
    fstream image_in;  //宣告一個fstream物件	
    char BM[2];        //檔頭前兩個bytes是字母BM，用以判別是否為bmp檔 
    char image_name[20];

    cout <<"Input image file name: "<<endl;
    cin>>image_name; //輸入影像名
    
    image_in.open(image_name,ios::in | ios::binary);//以二進位模式開檔為讀取狀態
 
	if(!image_in){ //如果image_in為真，表示無法開啟檔案
	   cerr << "Open "<< image_name<<" failed!"<<endl;
       exit(1); //中斷程式執行
	}
 
   
   image_in.read(BM,2*sizeof(char));//讀取2個bytes的大小放在BM裡

   if(BM[0] !='B' || BM[1] != 'M'){  //判別是否為bitmap檔
	 image_in.close();
	 cout << "This is not a Bitmap file : "<<image_name<< endl;
	 exit(1);
   }
   else{
        cout << "Image files : " <<image_name << endl;
   }

  image_in.seekg(0,ios::beg); //檔案指標指到檔案開頭第0個位移值(即第1個位置)
  image_in.read(header,1078*sizeof(char)); //讀取1078個bytes放在header

  image_in.seekg(18,ios::beg);//檔案指標指到檔案開頭第18個位移值

  image_in.read((char *) &image_col, sizeof(int)); //第18個位置是image寬度，佔4bytes
  image_in.read((char *) &image_row, sizeof(int)); //第22個位置是image高度，佔4bytes


  cout <<"image row :"<< image_row<<endl; //印出image的row
  cout <<"image col :"<< image_col<<endl; //印出image的col

   unsigned char *raw_data=new unsigned char[image_row*image_col];
   
  image_in.seekg(1078,ios::beg); //指到raw data

  for(i=0;i<image_col*image_row;i++){
     image_in.read((char*) &raw_data[i],sizeof(char));
  }  
        image_in.close();

   for(i=0;i<image_row;i++){
    	for(j=0;j<image_col;j++){
				cout <<(unsigned)* &raw_data[i*image_col+j]<<"  "; //印出raw data
		}
			cout <<endl;
	}

        
  }