int main()
{
int len=0
int len2=0
FILE* stream
FILE* stream1
FILE* stream2
char buf[50]
char buf1[50]
char buf2[50]
char text[1024]
printf("input anfile path to open:")
scanf("%s",buf)
stream=fopen(buf,"r+")
fseek(stream,0,SEEK_END)
len=ftell(stream)
printf("the file %s length is %d!\n",buf,len)
len2 = len/2
printf("intput 2 file name: \n")
scanf("%s%s",buf1,buf2)
fseek(stream,0,SEEK_SET)
stream1=fopen(buf1,"w+")
stream2=fopen(buf2,"w+")
fread(text,len2,1,stream)
fwrite(text,len2,1,stream1)
fread(text,len-len2,1,stream)
fwrite(text,len-len2,1,stream2)
fclose(stream)
fclose(stream1)
fclose(stream2)
return 0
}
文件合并
#include<stdio.h>
int main()
{
int len=0
int len2=0
FILE* stream
FILE* stream1
char buf[50]
char buf1[50]
char text[1024]
printf("input anfile path to open:")
scanf("%s",buf)
stream=fopen(buf,"r+")
fseek(stream,0,SEEK_END)
printf("intput another file name: \n")
scanf("%s",buf1)
stream1=fopen(buf1,"r+")
fseek(stream1,0,SEEK_END)
len=ftell(stream1)
fseek(stream1,0,SEEK_SET)
fread(text,len,1,stream1)
fwrite(text,len,1,stream)
fclose(stream)
fclose(stream1)
remove(buf1)//remove the another file
return 0
}
需要在程序目录下有文件存在
/************************************************************************** 该函数用于对图像进行阈值分割运算
* 参数:
* LPSTR lpDIBBits - 指向源DIB图像指针
* LONG lWidth - 源图像宽度（象素数）
* LONG lHeight - 源图像高度（象素数）
************************************************************************/
BOOL ImageChangeProc::ThresholdDIB(LPSTR lpDIBBits,LONG lWidth, LONG lHeight)
{
// 指向源图像的指针
LPSTR lpSrc
// 指向缓存图像的指针
LPSTR lpDst
// 指向缓存DIB图像的指针
LPSTR lpNewDIBBits
HLOCAL hNewDIBBits
//循环变量
long i
long j
unsigned char pixel
long lHistogram[256]
//阈值，最大灰度值与最小灰度值，两个区域的平均灰度值
unsigned char Threshold,NewThreshold,MaxGrayValue,MinGrayValue,Temp1GrayValue,Temp2GrayValue
//用于计算区域灰度平均值的中间变量
long lP1,lP2,lS1,lS2
//迭代次数
int IterationTimes
LONG lLineBytes
hNewDIBBits = LocalAlloc(LHND, lWidth * lHeight)
if (hNewDIBBits == NULL)
{
// 分配内存失败
return FALSE
}
// 锁定内存
lpNewDIBBits = (char * )LocalLock(hNewDIBBits)
// 初始化新分配的内存
lpDst = (char *)lpNewDIBBits
memset(lpDst, (BYTE)255, lWidth * lHeight)
lLineBytes = WIDTHBYTES(lWidth * 8)
for (i = 0 i < 256i++)
{
lHistogram[i]=0
}
//获得直方图
MaxGrayValue = 0
MinGrayValue = 255
for (i = 0i < lWidth i++)
{
for(j = 0j < lHeight j++)
{
lpSrc = (char *)lpDIBBits + lLineBytes * j + i
pixel = (unsigned char)*lpSrc
lHistogram[pixel]++
//修改最大，最小灰度值
if(MinGrayValue > pixel)
{
MinGrayValue = pixel
}
if(MaxGrayValue < pixel)
{
MaxGrayValue = pixel
}
}
}
//迭代求最佳阈值
NewThreshold = (MinGrayValue + MaxGrayValue)/2
Threshold = 0
for(IterationTimes = 0 Threshold != NewThreshold && IterationTimes < 1000IterationTimes ++)
{
Threshold = NewThreshold
lP1 =0
lP2 =0
lS1 = 0
lS2 = 0
//求两个区域的灰度平均值
for (i = MinGrayValuei <=Thresholdi++)
{
lP1 += lHistogram[i]*i
lS1 += lHistogram[i]
}
for (i = Threshold+1i<MaxGrayValuei++)
{
lP2 += lHistogram[i]*i
lS2 += lHistogram[i]
}
if(lS1==0||lS2==0)
{
// 释放内存
LocalUnlock(hNewDIBBits)
LocalFree(hNewDIBBits)
return FALSE
}
Temp1GrayValue = (unsigned char)(lP1 / lS1)
Temp2GrayValue = (unsigned char)(lP2 / lS2)
NewThreshold = (Temp1GrayValue + Temp2GrayValue)/2
}
//根据阈值将图像二值化
for (i = 0i < lWidth i++)
{
for(j = 0j < lHeight j++)
{
lpSrc = (char *)lpDIBBits + lLineBytes * j + i
lpDst = (char *)lpNewDIBBits + lLineBytes * j + i
pixel = (unsigned char)*lpSrc
if(pixel <= Threshold)
{
*lpDst = (unsigned char)0
}
else
{
*lpDst = (unsigned char)255
}
}
}
// 复制图像
memcpy(lpDIBBits, lpNewDIBBits, lWidth * lHeight)
// 释放内存
LocalUnlock(hNewDIBBits)
LocalFree(hNewDIBBits)
// 返回
return TRUE
}
参考：http://topic.csdn.net/t/20030909/13/2240079.html
#include<math.h>#include <iomanip.h>
#include <stdlib.h>
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream.h>
#include <fstream.h>
//---------------------------------------------------------------------------------------
//以下该模块是完成BMP图像(彩色图像是24bit RGB各8bit)的像素获取，并存在文件名为xiang_su_zhi.txt中
unsigned char *pBmpBuf//读入图像数据的指针
int bmpWidth//图像的宽
int bmpHeight//图像的高
RGBQUAD *pColorTable//颜色表指针
int biBitCount//图像类型，每像素位数
//-------------------------------------------------------------------------------------------
//读图像的位图数据、宽、高、颜色表及每像素位数等数据进内存，存放在相应的全局变量中
bool readBmp(char *bmpName)
{
FILE *fp=fopen(bmpName,"rb")//二进制读方式打开指定的图像文件
if(fp==0)
return 0
//跳过位图文件头结构BITMAPFILEHEADER
fseek(fp, sizeof(BITMAPFILEHEADER),0)
//定义位图信息头结构变量，读取位图信息头进内存，存放在变量head中
BITMAPINFOHEADER head
fread(&head, sizeof(BITMAPINFOHEADER), 1,fp) //获取图像宽、高、每像素所占位数等信息
bmpWidth = head.biWidth
bmpHeight = head.biHeight
biBitCount = head.biBitCount//定义变量，计算图像每行像素所占的字节数（必须是4的倍数）
int lineByte=(bmpWidth * biBitCount/8+3)/4*4//灰度图像有颜色表，且颜色表表项为256
if(biBitCount==8)
{
//申请颜色表所需要的空间，读颜色表进内存
pColorTable=new RGBQUAD[256]
fread(pColorTable,sizeof(RGBQUAD),256,fp)
}
//申请位图数据所需要的空间，读位图数据进内存
pBmpBuf=new unsigned char[lineByte * bmpHeight]
fread(pBmpBuf,1,lineByte * bmpHeight,fp)
fclose(fp)//关闭文件
return 1//读取文件成功
}
//-----------------------------------------------------------------------------------------
//给定一个图像位图数据、宽、高、颜色表指针及每像素所占的位数等信息,将其写到指定文件中
bool saveBmp(char *bmpName, unsigned char *imgBuf, int width, int height, int biBitCount, RGBQUAD *pColorTable)
{
//如果位图数据指针为0，则没有数据传入，函数返回
if(!imgBuf)
return 0
//颜色表大小，以字节为单位，灰度图像颜色表为1024字节，彩色图像颜色表大小为0
int colorTablesize=0
if(biBitCount==8)
colorTablesize=1024
//待存储图像数据每行字节数为4的倍数
int lineByte=(width * biBitCount/8+3)/4*4
//以二进制写的方式打开文件
FILE *fp=fopen(bmpName,"wb")
if(fp==0)
return 0
//申请位图文件头结构变量，填写文件头信息
BITMAPFILEHEADER fileHead
fileHead.bfType = 0x4D42//bmp类型
//bfSize是图像文件4个组成部分之和
fileHead.bfSize= sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + colorTablesize + lineByte*height
fileHead.bfReserved1 = 0
fileHead.bfReserved2 = 0
//bfOffBits是图像文件前3个部分所需空间之和
fileHead.bfOffBits=54+colorTablesize
//写文件头进文件
fwrite(&fileHead, sizeof(BITMAPFILEHEADER),1, fp)
//申请位图信息头结构变量，填写信息头信息
BITMAPINFOHEADER head
head.biBitCount=biBitCount
head.biClrImportant=0
head.biClrUsed=0
head.biCompression=0
head.biHeight=height
head.biPlanes=1
head.biSize=40
head.biSizeImage=lineByte*height
head.biWidth=width
head.biXPelsPerMeter=0
head.biYPelsPerMeter=0
//写位图信息头进内存
fwrite(&head, sizeof(BITMAPINFOHEADER),1, fp)
//如果灰度图像，有颜色表，写入文件
if(biBitCount==8)
fwrite(pColorTable, sizeof(RGBQUAD),256, fp)
//写位图数据进文件
fwrite(imgBuf, height*lineByte, 1, fp)
//关闭文件
fclose(fp)
return 1
}
//----------------------------------------------------------------------------------------
//以下为像素的读取函数
void doIt()
{
//读入指定BMP文件进内存
char readPath[]="nv.BMP"
readBmp(readPath)
//输出图像的信息
cout<<"width="<<bmpWidth<<" height="<<bmpHeight<<" biBitCount="<<biBitCount<<endl
//循环变量，图像的坐标
//每行字节数
int lineByte=(bmpWidth*biBitCount/8+3)/4*4
//循环变量，针对彩色图像，遍历每像素的三个分量
int m=0,n=0,count_xiang_su=0
//将图像左下角1/4部分置成黑色
ofstream outfile("图像像素.txt",ios::in|ios::trunc)
if(biBitCount==8) //对于灰度图像
{
//------------------------------------------------------------------------------------
//以下完成图像的分割成8*8小单元，并把像素值存储到指定文本中。由于BMP图像的像素数据是从
//左下角：由左往右，由上往下逐行扫描的
int L1=0
int hang=63
int lie=0
//int L2=0
//int fen_ge=8
for(int fen_ge_hang=0fen_ge_hang<8fen_ge_hang++)//64*64矩阵行循环
{
for(int fen_ge_lie=0fen_ge_lie<8fen_ge_lie++)//64*64列矩阵循环
{
//--------------------------------------------
for(L1=hangL1>hang-8L1--)//8*8矩阵行
{
for(int L2=lieL2<lie+8L2++)//8*8矩阵列
{
m=*(pBmpBuf+L1*lineByte+L2)
outfile<<m<<" "
count_xiang_su++
if(count_xiang_su%8==0)//每8*8矩阵读入文本文件
{
outfile<<endl
}
}
}
//---------------------------------------------
hang=63-fen_ge_hang*8//64*64矩阵行变换
lie+=8//64*64矩阵列变换
//该一行（64）由8个8*8矩阵的行组成
}
hang-=8//64*64矩阵的列变换
lie=0//64*64juzhen
}
}
//double xiang_su[2048]
//ofstream outfile("xiang_su_zhi.txt",ios::in|ios::trunc)
if(!outfile)
{
cout<<"open error!"<<endl
exit(1)
}
else if(biBitCount==24)
{//彩色图像
for(int i=0i<bmpHeighti++)
{
for(int j=0j<bmpWidthj++)
{
for(int k=0k<3k++)//每像素RGB三个分量分别置0才变成黑色
{
//*(pBmpBuf+i*lineByte+j*3+k)-=40
m=*(pBmpBuf+i*lineByte+j*3+k)
outfile<<m<<" "
count_xiang_su++
if(count_xiang_su%8==0)
{
outfile<<endl
}
//n++
}
n++
}
}
cout<<"总的像素个素为:"<<n<<endl
cout<<"----------------------------------------------------"<<endl
}
//将图像数据存盘
char writePath[]="nvcpy.BMP"//图片处理后再存储
saveBmp(writePath, pBmpBuf, bmpWidth, bmpHeight, biBitCount, pColorTable)
//清除缓冲区，pBmpBuf和pColorTable是全局变量，在文件读入时申请的空间
delete []pBmpBuf
if(biBitCount==8)
delete []pColorTable
}
void main()
{
doIt()
}
