testdlg.cpp

将一张图片切割成任意大小的小图片,经测试数据正确无误

// TestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Mybole.h"
#include "TestDlg.h"

#include <stdio.h>
#include <stdlib.h>
#define Headsize 54
int m,n,cow_num,rol_num, flag_num;

long width_old,height_old;
unsigned char header[54];
unsigned char *image;
BITMAP bm;

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/************************************************************
	BITMAP * LoadBitmapFile(char* FileName, int x, int y, HWND hwnd)
   加载一张位图的信息,并返回一个位图的指针********************
*************************************************************/


BITMAP * LoadBitmapFile(char* FileName, int x, int y, HWND hwnd)
{

   HDC hdc = GetDC(hwnd);
   HANDLE BitHandle;
   BitHandle = (HBITMAP)LoadImage(NULL, FileName, IMAGE_BITMAP, 0,0, LR_LOADFROMFILE);
   if(BitHandle == NULL)
   {
      MessageBox(0, "加载指定的位图文件出错", "程序错误!",
      MB_ICONERROR | MB_SYSTEMMODAL | MB_OK);
	  return NULL;
   }
   HDC dc = CreateCompatibleDC(hdc);
   SelectObject(dc, BitHandle);
   GetObject(BitHandle, sizeof(BITMAP), &bm);
  
   BitBlt(hdc, x, y, bm.bmWidth, bm.bmHeight, dc, 0,0, SRCCOPY);
   CPoint m_pt;
  // m_pt.x=x+bm.bmWidth+num1;
   //m_pt.y=y+num2;
	BitBlt(hdc, m_pt.x, m_pt.y, bm.bmWidth, bm.bmHeight, dc, 0,0, SRCCOPY);
 
   ReleaseDC(hwnd, hdc);
   return(&bm);
}


unsigned char * bmp_read( const char *filename) 
 {
//	unsigned char *image;
   char fname_bmp[128];
   FILE *fp;
   sprintf(fname_bmp, "%s.bmp", filename);
   if (!(fp = fopen(fname_bmp, "rb"))) 
    return NULL;
  fseek(fp,0,SEEK_SET);
  fread(header,sizeof(unsigned char),Headsize,fp);

  //获得文件宽度
	width_old=header[18];
	width_old+=(header[19]<<8);
	width_old+=(header[20]<<16);
	width_old+=(header[21]<<24);
//	printf("the width_old of the  picture %d\n",width_old);
      
    //获得文件高度
	height_old= header[22];
	height_old+=(header[23]<<8);
	height_old+=(header[24]<<16);
	height_old+=(header[25]<<16);
//	printf("the height_old of the picture %d\n",height_old);	
	
	image = (unsigned char *)malloc(width_old * height_old*2);
	if (image == NULL) 
    return NULL;

  fread(image, sizeof(unsigned char), width_old * height_old*2, fp);
  
 // AfxMessageBox("the programe in the read file");
  fclose(fp);
   return image;
 }
int bmp_write(unsigned char *image) 
{
	FILE *fp[65];
  	char fname_bmp[128];
	long width=m, height=n;
//	long data_size;
	long file_size = (width) * (height)*2+Headsize;
	int i=0,j,k,num1,num2,flag=0,temp1,temp2;
	
	j=width_old/m;
	k=height_old/n;
	cow_num=j;		//行数目
	rol_num=k;		//列数目
	if(j==0)	{width=width_old; cow_num=1;}	
	if(k==0)	{height=height_old; rol_num=1;}			

	//修改头文件数据
	//修改文件大小
	header[2] = (unsigned char)(file_size &0x000000ff);
	header[3] = (unsigned char)((file_size >> 8) & 0x000000ff);
	header[4] = (unsigned char)((file_size >> 16) & 0x000000ff);
	header[5] = (unsigned char)((file_size >> 24) & 0x000000ff);
       
	//修改文件宽度
	header[18] = (unsigned char)(width & 0x000000ff);
	header[19] = (unsigned char)((width >> 8) &0x000000ff);
	header[20] = (unsigned char)((width >> 16) &0x000000ff);
	header[21] = (unsigned char)((width >> 24) &0x000000ff);
   
    //修改文件高度
	header[22] = (unsigned char)(height &0x000000ff);
	header[23] = (unsigned char)((height >> 8) &0x000000ff);
	header[24] = (unsigned char)((height >> 16) &0x000000ff);
	header[25] = (unsigned char)((height >> 24) &0x000000ff);
	
	//修改文件数据大小
	/* data_size=width*height*2;
	header[34] = (unsigned char)(data_size &0x000000ff);
	header[35] = (unsigned char)((data_size >> 8) &0x000000ff);
	header[36] = (unsigned char)((data_size >> 16) &0x000000ff);
	header[37] = (unsigned char)((data_size >> 24) &0x000000ff);*/
	
	if((width_old%m==0)&&(height_old%n==0))
	{
		flag_num=j*k;				//flag_num表示可以将小屏幕分成多少份.
		cow_num=j;	//用m记录每一行的数据的个数.
		rol_num=k;	//用n记录每一列的数据的个数.
	}
	else
	{
		if(width_old%m)	
		{
			flag_num=(j+1)*k;
			cow_num=j+1;
		}
		if(height_old%n)
		{
			flag_num=j*(k+1);
			rol_num=k+1;
		}
		if((width_old%m)&&(height_old%n))
		{
			flag_num=(j+1)*(k+1);
			cow_num=j+1;
			rol_num=k+1;
		}
	}

	for(flag=0;flag<flag_num;flag++)
	{
		sprintf(fname_bmp, "%s_%d.bmp", "1007",flag);
		if (!(fp[flag] = fopen(fname_bmp, "wb+"))) 
		return -1;
		 fseek(fp[flag],0,SEEK_SET);
		 fwrite(header, sizeof(unsigned char), Headsize, fp[flag]);		//所有文件都按需要截取的格式写头文件信息。
	}
	flag=0;			//准备写第一个文件。
	if(flag_num==1)
	{
		fwrite(image, sizeof(unsigned char), width_old*height_old*2, fp[flag]);		//BMP图片数据信息的填写
	}
	else
	{
		
		if((width_old%m==0)&&(height_old%n==0))
		{
			for(temp2=0;temp2<k;temp2++)		//需要截取的小屏的列数超过1时,即分屏分成至少K行数目的小屏,进行按行读取的形式.且前面的K-1行的数据都是完整的一小屏数据.只有最后一行的屏幕可能会出现误差需要校正.
			{	
			
				for (i=0;i<n;i++)		//写一排小屏幕的数据
				{	
					
					for(temp1=0;temp1<j;temp1++)
					{	
						fwrite(image, sizeof(unsigned char), width*2, fp[flag]);		//BMP图片数据信息的填写
						image=image+width*2;
						flag++;
					}
					flag=flag-j;
				}
					flag=flag+j;
			}
		}
		if(width_old%width)				//当行不能整行截取时.
		{
			num1=width_old%width;
			//printf("the size of the nomal file is %x\n",file_size);

			//修改最每一行的最后一个文件宽度
			num1=width_old%width;
			header[18] = (unsigned char)(num1 & 0x000000ff);
			header[19] = (unsigned char)((num1 >> 8) &0x000000ff);
			header[20] = (unsigned char)((num1 >> 16) &0x000000ff);
			header[21] = (unsigned char)((num1 >> 24) &0x000000ff);
			//修改文件大小
			file_size = (num1) * (height)*2+Headsize;
			//修改文件大小
			header[2] = (unsigned char)(file_size &0x000000ff);
			header[3] = (unsigned char)((file_size >> 8) & 0x000000ff);
			header[4] = (unsigned char)((file_size >> 16) & 0x000000ff);
			header[5] = (unsigned char)((file_size >> 24) & 0x000000ff);
		
			//printf("the size of the last file is %x\n",file_size);
			for(temp1=0;temp1<k;temp1++)
			{
				flag=(temp1+1)*(j+1)-1;
				fseek(fp[flag],0,SEEK_SET);
				fwrite(header, sizeof(unsigned char), Headsize, fp[flag]);
			}
			flag=0;
			//printf("the file of heade has been deal success\n");
		
			for(temp2=0;temp2<k;temp2++)		//需要截取的小屏的列数超过1时,即分屏分成至少K行数目的小屏,进行按行读取的形式.且前面的K-1行的数据都是完整的一小屏数据.只有最后一行的屏幕可能会出现误差需要校正.
			{	
			
				for (i=0;i<n;i++)		//写一排小屏幕的数据
				{	
					
					for(temp1=0;temp1<j;temp1++)
					{	
						fwrite(image, sizeof(unsigned char), width*2, fp[flag]);		//BMP图片数据信息的填写
						image=image+width*2;
						flag++;
					}
						fwrite(image, sizeof(unsigned char), num1*2, fp[flag]);		//BMP图片数据信息的填写
						image=image+num1*2;
						flag=flag-j;
				}
					flag=flag+j+1;
			}
		}
	
		if(width_old%width==0)	num1=width;
		if(height_old%height)
		{	
			//修改文件宽度
			header[18] = (unsigned char)(width & 0x000000ff);
			header[19] = (unsigned char)((width >> 8) &0x000000ff);
			header[20] = (unsigned char)((width >> 16) &0x000000ff);
			header[21] = (unsigned char)((width >> 24) &0x000000ff);
	//		printf("%d\t%d\t%d\t%d\n",header[18],header[19],header[20],	header[21]);

			num2=height_old%height;
			header[22] = (unsigned char)(num2 &0x000000ff);
			header[23] = (unsigned char)((num2 >> 8) &0x000000ff);
			header[24] = (unsigned char)((num2 >> 16) &0x000000ff);
			header[25] = (unsigned char)((num2 >> 24) &0x000000ff);
			file_size = (width) * (num2)*2+Headsize;//修改文件大小
	//		printf("the width of the last row picture is %d\n",width);

	//		printf("the size of width) * (num2file is %x\n",file_size);
			//修改文件大小
			header[2] = (unsigned char)(file_size &0x000000ff);
			header[3] = (unsigned char)((file_size >> 8) & 0x000000ff);
			header[4] = (unsigned char)((file_size >> 16) & 0x000000ff);
			header[5] = (unsigned char)((file_size >> 24) & 0x000000ff);
			
			//printf("the size of the last file is %x\n",file_size);
			temp2=flag;
			printf("flag=%d\n",flag);
			flag=flag_num-cow_num;
			for(temp1=0;temp1<j;temp1++)
			{
				fseek(fp[flag],0,SEEK_SET);
				fwrite(header, sizeof(unsigned char), Headsize, fp[flag]);